feat: DbContext

Docs/学习总结.ipynb

@@ -19,7 +19,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 1,
    "metadata": {
     "dotnet_interactive": {
      "language": "csharp"
@@ -31,7 +31,17 @@
      "languageId": "polyglot-notebook"
     }
    },
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<div><div><strong>Restore sources</strong><ul><li><span>https://api.nuget.org/v3/index.json</span></li></ul></div><div></div><div><strong>Installed Packages</strong><ul><li><span>Microsoft.EntityFrameworkCore, 7.0.5</span></li><li><span>Microsoft.EntityFrameworkCore.InMemory, 7.0.5</span></li><li><span>Microsoft.EntityFrameworkCore.Sqlite, 7.0.5</span></li><li><span>Microsoft.EntityFrameworkCore.SqlServer, 7.0.5</span></li></ul></div></div>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
    "source": [
     "//设置包源\n",
     "#i \"https://api.nuget.org/v3/index.json\"\n",
@@ -50,6 +60,104 @@
    "source": [
     "## DbContext"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {
+    "dotnet_interactive": {
+     "language": "csharp"
+    },
+    "polyglot_notebook": {
+     "kernelName": "csharp"
+    },
+    "vscode": {
+     "languageId": "polyglot-notebook"
+    }
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<table><thead><tr><th><i>index</i></th><th>value</th></tr></thead><tbody><tr><td>0</td><td><details class=\"dni-treeview\"><summary><span class=\"dni-code-hint\"><code>Submission#6+Account</code></span></summary><div><table><thead><tr></tr></thead><tbody><tr><td>Id</td><td><div class=\"dni-plaintext\"><pre>1</pre></div></td></tr><tr><td>Code</td><td>001</td></tr><tr><td>Name</td><td>zhangsan</td></tr><tr><td>Pwd</td><td>123456</td></tr><tr><td>Age</td><td><div class=\"dni-plaintext\"><pre>25</pre></div></td></tr><tr><td>State</td><td><div class=\"dni-plaintext\"><pre>0</pre></div></td></tr></tbody></table></div></details></td></tr><tr><td>1</td><td><details class=\"dni-treeview\"><summary><span class=\"dni-code-hint\"><code>Submission#6+Account</code></span></summary><div><table><thead><tr></tr></thead><tbody><tr><td>Id</td><td><div class=\"dni-plaintext\"><pre>2</pre></div></td></tr><tr><td>Code</td><td>002</td></tr><tr><td>Name</td><td>lisi</td></tr><tr><td>Pwd</td><td>123456</td></tr><tr><td>Age</td><td><div class=\"dni-plaintext\"><pre>35</pre></div></td></tr><tr><td>State</td><td><div class=\"dni-plaintext\"><pre>0</pre></div></td></tr></tbody></table></div></details></td></tr></tbody></table><style>\r\n",
+       ".dni-code-hint {\r\n",
+       "    font-style: italic;\r\n",
+       "    overflow: hidden;\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview {\r\n",
+       "    white-space: nowrap;\r\n",
+       "}\r\n",
+       ".dni-treeview td {\r\n",
+       "    vertical-align: top;\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "details.dni-treeview {\r\n",
+       "    padding-left: 1em;\r\n",
+       "}\r\n",
+       "table td {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "table tr { \r\n",
+       "    vertical-align: top; \r\n",
+       "    margin: 0em 0px;\r\n",
+       "}\r\n",
+       "table tr td pre \r\n",
+       "{ \r\n",
+       "    vertical-align: top !important; \r\n",
+       "    margin: 0em 0px !important;\r\n",
+       "} \r\n",
+       "table th {\r\n",
+       "    text-align: start;\r\n",
+       "}\r\n",
+       "</style>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "using Microsoft.EntityFrameworkCore;\n",
+    "using Microsoft.EntityFrameworkCore.SqlServer;\n",
+    "public class AppDbContext: DbContext\n",
+    "{\n",
+    "    public DbSet<Account> Accounts {get;set;}\n",
+    "\n",
+    "    protected  override void OnConfiguring(DbContextOptionsBuilder builder)\n",
+    "    {\n",
+    "        builder\n",
+    "        .UseSqlServer(@\"Server=127.0.0.1\\SQL2019;Database=EFCore7Study;User Id=sa;Password=gly-bicijinlian;Encrypt=True;TrustServerCertificate=True;\")\n",
+    "        .EnableSensitiveDataLogging();\n",
+    "    }\n",
+    "\n",
+    "    protected override void OnModelCreating(ModelBuilder builder)\n",
+    "    {\n",
+    "        builder.Entity<Account>().ToTable(\"Account\");\n",
+    "        base.OnModelCreating(builder);\n",
+    "    }\n",
+    "}\n",
+    "\n",
+    "public class Account\n",
+    "{\n",
+    "    public int Id { get; set; }\n",
+    "    public string Code { get; set; }\n",
+    "    public string Name { get; set; }\n",
+    "    public string Pwd { get; set; }\n",
+    "\n",
+    "    public int Age { get; set; }\n",
+    "\n",
+    "    public int State { get; set; }        \n",
+    "}\n",
+    "\n",
+    "using(var db = new AppDbContext())\n",
+    "{\n",
+    "    var itmes = db.Accounts.ToList();\n",
+    "\n",
+    "    itmes.Display();\n",
+    "\n",
+    "}"
+   ]
   }
  ],
  "metadata": {

Docs/说明.md

@@ -1,3 +1,60 @@
 # 说明
 ========
-EF Core 7的学习总结项目。
+EF Core 7的学习总结项目。
+
+## 使用 工厂对象(AddDbContextFactory)时,多构建函数时，IoC获取对象时会异常
+在使用扩展方法 AddDbContextFactory()注册服务时，如果 DbContext有多个构建函数，会在获取服务时因为不知道使用哪个构建函数而异常。
+
+解决方案：
++ 不要使用多构造函数
++ 合并成一个构建函数:比如统一使用 DbContextOptions<T> 参数，非IoC可以手动构建 DbContextOptions<T> 对象当参数
++ 使用 ActivatorUtilitiesConstructor 特性，指定IoC使用的构造函数
+```csharp
+public class AppDbContext : DbContext
+    {
+        private string? _connectString;
+
+        public AppDbContext()
+        {
+
+        }
+
+        public AppDbContext(string? connectstring, string dd = "dd")
+        {
+            _connectString = connectstring;
+        }
+
+        //指定IoC使用的构造函数
+        [ActivatorUtilitiesConstructor]
+        public AppDbContext(DbContextOptions<AppDbContext> options)
+            : base(options)
+        {
+
+        }
+
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            if (!optionsBuilder.IsConfigured)
+            {
+                if (string.IsNullOrWhiteSpace(_connectString))
+                {
+                    _connectString = @"Server=127.0.0.1\SQL2019;Database=EFCore7Study;User Id=sa;Password=xxxx;Encrypt=True;TrustServerCertificate=True;";
+                }
+
+                optionsBuilder
+                    .UseSqlServer(_connectString)
+                    .EnableSensitiveDataLogging();
+            }
+        }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<Account>().ToTable("Account");
+
+            base.OnModelCreating(modelBuilder);
+        }
+
+        public DbSet<Account> Accounts { get; set; }
+    }
+```

EFCore7Study.BlazorServerApp/Pages/Index.razor

@@ -1,9 +1,37 @@
 @page "/"
+@using EFCore7Study.DataService;
+@using EFCore7Study.DataService.Models;
+@using Microsoft.EntityFrameworkCore;
+@inject IDbContextFactory<AppDbContext> DbFactory
 
 <PageTitle>Index</PageTitle>
 
+@foreach(var account in AccountList)
+{
+    <h2>@(account.Name)</h2>
+}
+
 <h1>Hello, world!</h1>
 
 Welcome to your new app.
 
 <SurveyPrompt Title="How is Blazor working for you?" />
+
+@code{
+    private List<Account> AccountList { get; set; } = new List<Account>();
+
+    protected override void OnInitialized()
+    {
+        AccountList = GetAccounts();
+        base.OnInitialized();
+    }
+
+    private List<Account>  GetAccounts()
+    {
+        using (var context = DbFactory.CreateDbContext())
+        {
+            return context.Accounts.ToList();
+
+        };
+    }
+}

EFCore7Study.BlazorServerApp/Program.cs

@@ -1,7 +1,10 @@
 using EFCore7Study.BlazorServerApp.Data;
+using EFCore7Study.DataService;
 
 using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Web;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Internal;
 
 namespace EFCore7Study.BlazorServerApp
 {
@@ -16,6 +19,20 @@ namespace EFCore7Study.BlazorServerApp
             builder.Services.AddServerSideBlazor();
             builder.Services.AddSingleton<WeatherForecastService>();
 
+            //EF Core
+            var connectString = builder.Configuration.GetConnectionString("SQLServer");
+
+
+
+
+
+            builder.Services.AddDbContextFactory<AppDbContext>
+            (
+                 b => b.UseSqlServer(connectString).EnableSensitiveDataLogging(), ServiceLifetime.Scoped
+            );
+
+            builder.Services.AddDbContextFactory<AppDbContext>(options => options.UseSqlServer(connectString));
+
             var app = builder.Build();
 
             // Configure the HTTP request pipeline.

EFCore7Study.BlazorServerApp/appsettings.json

@@ -5,5 +5,8 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "ConnectionStrings": {
+    "SQLServer": "Server=127.0.0.1\\SQL2019;Database=EFCore7Study;User Id=sa;Password=gly-bicijinlian;Encrypt=True;TrustServerCertificate=True;"
+  }
 }

EFCore7Study.CoreConsoleApp/Program.cs

@@ -8,274 +8,53 @@ namespace EFCore7Study.CoreConsoleApp
     {
         static void Main(string[] args)
         {
-            AnsiConsole.Status()
-            .Spinner(Spinner.Known.BouncingBar)
-            .Start("测试一个", ctx =>
-            {
-                ctx.Spinner(Spinner.Known.BouncingBar);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Aesthetic));
-
-                ctx.Spinner(Spinner.Known.Arc);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Arc));
-
-                ctx.Spinner(Spinner.Known.Arrow);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Arrow));
-
-                ctx.Spinner(Spinner.Known.Arrow2);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Arrow2));
-
-                ctx.Spinner(Spinner.Known.Arrow3);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Arrow3));
-
-                ctx.Spinner(Spinner.Known.Balloon);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Balloon));
-
-                ctx.Spinner(Spinner.Known.Balloon2);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Balloon2));
-
-                ctx.Spinner(Spinner.Known.BetaWave);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.BetaWave));
-
-                ctx.Spinner(Spinner.Known.Bounce);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Bounce));
-
-                ctx.Spinner(Spinner.Known.BouncingBall);
-                Thread.Sleep(3000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.BouncingBall));
-
-                ctx.Spinner(Spinner.Known.BouncingBar);
-                Thread.Sleep(3000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.BouncingBar));
-
-                ctx.Spinner(Spinner.Known.BoxBounce);
-                Thread.Sleep(3000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.BoxBounce));
-
-                ctx.Spinner(Spinner.Known.BoxBounce2);
-                Thread.Sleep(3000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.BoxBounce2));
-
-                ctx.Spinner(Spinner.Known.Dots8Bit);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Dots8Bit));
-
-                ctx.Spinner(Spinner.Known.Christmas);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Christmas));
-
-                ctx.Spinner(Spinner.Known.Circle);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Circle));
-
-                ctx.Spinner(Spinner.Known.CircleHalves);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.CircleHalves));
-
-                ctx.Spinner(Spinner.Known.CircleQuarters);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.CircleQuarters));
-
-                ctx.Spinner(Spinner.Known.Clock);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Clock));
-
-                ctx.Spinner(Spinner.Known.Default);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Default));
-
-                ctx.Spinner(Spinner.Known.Dots);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Dots));
-
-                ctx.Spinner(Spinner.Known.Dots2);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Dots2));
-
-                ctx.Spinner(Spinner.Known.Dots8Bit);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Dots8Bit));
-                //========================================================
-                ctx.Spinner(Spinner.Known.Dqpb);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Dqpb));
-
-                ctx.Spinner(Spinner.Known.Earth);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Earth));
-
-                ctx.Spinner(Spinner.Known.Flip);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Flip));
-
-                ctx.Spinner(Spinner.Known.Grenade);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Grenade));
-
-                ctx.Spinner(Spinner.Known.GrowHorizontal);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.GrowHorizontal));
-
-                ctx.Spinner(Spinner.Known.GrowVertical);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.GrowVertical));
-
-                ctx.Spinner(Spinner.Known.Hamburger);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Hamburger));
-                Thread.Sleep(2000);
-
-                ctx.Spinner(Spinner.Known.Hearts);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Hearts));
-
-                ctx.Spinner(Spinner.Known.Layer);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Layer));
-
-                ctx.Spinner(Spinner.Known.Line);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Line));
-
-                ctx.Spinner(Spinner.Known.Line2);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Line2));
-
-                ctx.Spinner(Spinner.Known.Material);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Material));
-
-                ctx.Spinner(Spinner.Known.Monkey);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Monkey));
-
-                ctx.Spinner(Spinner.Known.Moon);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Moon));
-
-                ctx.Spinner(Spinner.Known.Noise);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Noise));
-
-                ctx.Spinner(Spinner.Known.Pipe);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Pipe));
-
-                ctx.Spinner(Spinner.Known.Point);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Dots8Bit));
-
-                ctx.Spinner(Spinner.Known.Pong);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Pong));
-
-                ctx.Spinner(Spinner.Known.Runner);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Runner));
-
-                ctx.Spinner(Spinner.Known.Shark);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Shark));
-
-                ctx.Spinner(Spinner.Known.SimpleDots);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.SimpleDots));
-
-                ctx.Spinner(Spinner.Known.SimpleDotsScrolling);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.SimpleDotsScrolling));
-
-                ctx.Spinner(Spinner.Known.Smiley);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Smiley));
-
-                ctx.Spinner(Spinner.Known.SquareCorners);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.SquareCorners));
-
-                ctx.Spinner(Spinner.Known.Squish);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Squish));
-
-                ctx.Spinner(Spinner.Known.Star);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Star));
-
-                ctx.Spinner(Spinner.Known.Star2);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Star2));
-
-                ctx.Spinner(Spinner.Known.Toggle);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Toggle));
-
-                ctx.Spinner(Spinner.Known.Toggle2);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Toggle2));
-
-                ctx.Spinner(Spinner.Known.Triangle);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Triangle));
-
-                ctx.Spinner(Spinner.Known.Weather);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Weather));
-
-                ctx.Spinner(Spinner.Known.Weather);
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine(nameof(Spinner.Known.Weather));
-            });
 
+        }
 
+        static void ShowQuery()
+        {
             AnsiConsole.Status()
-            .Spinner(Spinner.Known.Balloon)
-            .Start("准备查询数据库...", ctx =>
-            {
-                Thread.Sleep(2000);
-
-                // 生成查询对象
-                ctx.Status("生成查询对象...");
-                AppDbContext dbContext = new AppDbContext();
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine("生成查询对象: DbContext, 完成！");
-
-                // 连接数据库
-                ctx.Status("正在连接到数据库服务器...");
-                ctx.Spinner(Spinner.Known.Balloon);
-                ctx.SpinnerStyle(Style.Parse("green"));
-                Thread.Sleep(2000);
-                AnsiConsole.MarkupLine("已连接到数据库服务器！");
-
-
-                // 查询数据
-                ctx.Status("正在查询数据...");
-                ctx.Spinner(Spinner.Known.Star2);
-                ctx.SpinnerStyle(Style.Parse("yellow"));
-                Thread.Sleep(3000);
-                AnsiConsole.MarkupLine("完成查询！");
-
-
-                //输出查询结果
-                ctx.Status("输出查询结果...");
-                ctx.Spinner(Spinner.Known.Arrow);
-                ctx.SpinnerStyle(Style.Parse("red"));
-
-                dbContext.Accounts.ToList().ForEach(x =>
-               {
-                   AnsiConsole.MarkupLine($"标识：{x.Id}，编号：{x.Code}, 姓名：{x.Name.PadRight(10)}，年龄：{x.Age}, 密码：{x.Pwd}");
-                   Thread.Sleep(300);
-               });
-
-                AnsiConsole.MarkupLine("任务完成！");
-
-            });
+                .Spinner(Spinner.Known.Balloon)
+                .Start("准备查询数据库...", ctx =>
+                {
+                    Thread.Sleep(2000);
+
+                    // 生成查询对象
+                    ctx.Status("生成查询对象...");
+                    AppDbContext dbContext = new AppDbContext();
+                    //Thread.Sleep(2000);
+                    AnsiConsole.MarkupLine("生成查询对象: DbContext, 完成！");
+
+                    // 连接数据库
+                    ctx.Status("正在连接到数据库服务器...");
+                    ctx.Spinner(Spinner.Known.Balloon);
+                    ctx.SpinnerStyle(Style.Parse("green"));
+                    //Thread.Sleep(2000);
+                    AnsiConsole.MarkupLine("已连接到数据库服务器！");
+
+
+                    // 查询数据
+                    ctx.Status("正在查询数据...");
+                    ctx.Spinner(Spinner.Known.Star2);
+                    ctx.SpinnerStyle(Style.Parse("yellow"));
+                    //Thread.Sleep(3000);
+                    AnsiConsole.MarkupLine("完成查询！");
+
+
+                    //输出查询结果
+                    ctx.Status("输出查询结果...");
+                    ctx.Spinner(Spinner.Known.Arrow);
+                    ctx.SpinnerStyle(Style.Parse("red"));
+
+                    dbContext.Accounts.ToList().ForEach(x =>
+                   {
+                       AnsiConsole.MarkupLine($"标识：{x.Id}，编号：{x.Code}, 姓名：{x.Name.PadRight(10)}，年龄：{x.Age}, 密码：{x.Pwd}");
+                       Thread.Sleep(300);
+                   });
+
+                    AnsiConsole.MarkupLine("任务完成！");
+
+                });
         }
     }
 }

EFCore7Study.DataService/AppDbContext.cs

@@ -1,25 +1,27 @@
 using EFCore7Study.DataService.Models;
 
 using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
 
 namespace EFCore7Study.DataService
 {
+    /// <summary>
+    /// 多构造函数
+    /// 为使用工厂方式注册，加 ActivatorUtilitiesConstructor 特性
+    /// </summary>
     public class AppDbContext : DbContext
     {
-        private string? _connectString;
+        /// <summary>
+        /// 连接字符串，可实现属性设置，避免多构造函数在Factory时，IoC异常
+        /// </summary>
+        public string? ConnectString = @"Server=127.0.0.1\SQL2019;Database=EFCore7Study;User Id=sa;Password=gly-bicijinlian;Encrypt=True;TrustServerCertificate=True;";
 
         public AppDbContext()
         {
 
         }
 
-        public AppDbContext(string connectstring)
-        {
-            _connectString = connectstring;
-        }
-
-        public AppDbContext(DbContextOptions<AppDbContext> options)
-            : base(options)
+        public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
         {
 
         }
@@ -28,13 +30,13 @@ namespace EFCore7Study.DataService
         {
             if (!optionsBuilder.IsConfigured)
             {
-                if (string.IsNullOrWhiteSpace(_connectString))
+                if (string.IsNullOrWhiteSpace(ConnectString))
                 {
-                    _connectString = @"Server=127.0.0.1\SQL2019;Database=EFCore7Study;User Id=sa;Password=gly-bicijinlian;Encrypt=True;TrustServerCertificate=True;";
+                    ConnectString = @"Server=127.0.0.1\SQL2019;Database=EFCore7Study;User Id=sa;Password=gly-bicijinlian;Encrypt=True;TrustServerCertificate=True;";
                 }
 
                 optionsBuilder
-                    .UseSqlServer(_connectString)
+                    .UseSqlServer(ConnectString)
                     .EnableSensitiveDataLogging();
             }
         }

EFCore7Study.DataService/AppDbContext2.cs

@@ -0,0 +1,49 @@
+using EFCore7Study.DataService.Models;
+
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure.Internal;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace EFCore7Study.DataService
+{
+    /// <summary>
+    /// 多构造函数
+    /// 为使用工厂方式注册，合并为一个
+    /// </summary>
+    public class AppDbContext2 : DbContext
+    {
+        private string? _connectString;
+
+        //因为先执行的 base(options),到此处时AppDbContext2已经注册完成，连接字符串实际上是用不了的。当然换成其它参数或用在其它地方是可以的。
+        public AppDbContext2(DbContextOptions<AppDbContext2> options, string? connectString = null)
+        : base(options)
+        {
+            _connectString = connectString;
+        }
+
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            if (!optionsBuilder.IsConfigured)
+            {
+                if (string.IsNullOrWhiteSpace(_connectString))
+                {
+                    _connectString = @"Server=127.0.0.1\SQL2019;Database=EFCore7Study;User Id=sa;Password=gly-bicijinlian;Encrypt=True;TrustServerCertificate=True;";
+                }
+
+                optionsBuilder
+                    .UseSqlServer(_connectString)
+                    .EnableSensitiveDataLogging();
+            }
+        }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<Account>().ToTable("Account");
+
+            base.OnModelCreating(modelBuilder);
+        }
+
+        public DbSet<Account> Accounts { get; set; }
+    }
+}

EFCore7Study.DataService/AppDbContext3.cs

@@ -0,0 +1,58 @@
+using EFCore7Study.DataService.Models;
+
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace EFCore7Study.DataService
+{
+    /// <summary>
+    /// 多构造函数
+    /// 使用工厂对象(AddDbContextFactory)时,因多构建函数，IoC 获取对象时会异常
+    /// </summary>
+    public class AppDbContext3 : DbContext
+    {
+        private string? _connectString;
+
+        public AppDbContext3()
+        {
+
+        }
+
+        public AppDbContext3(string? connectstring)
+        {
+            _connectString = connectstring;
+        }
+
+
+        public AppDbContext3(DbContextOptions<AppDbContext> options)
+            : base(options)
+        {
+
+        }
+
+
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            if (!optionsBuilder.IsConfigured)
+            {
+                if (string.IsNullOrWhiteSpace(_connectString))
+                {
+                    _connectString = @"Server=127.0.0.1\SQL2019;Database=EFCore7Study;User Id=sa;Password=gly-bicijinlian;Encrypt=True;TrustServerCertificate=True;";
+                }
+
+                optionsBuilder
+                    .UseSqlServer(_connectString)
+                    .EnableSensitiveDataLogging();
+            }
+        }
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder)
+        {
+            modelBuilder.Entity<Account>().ToTable("Account");
+
+            base.OnModelCreating(modelBuilder);
+        }
+
+        public DbSet<Account> Accounts { get; set; }
+    }
+}

EFCore7Study.DataService/Models/Account.cs

@@ -6,9 +6,9 @@
     public class Account
     {
         public int Id { get; set; }
-        public string Code { get; set; }
-        public string Name { get; set; }
-        public string Pwd { get; set; }
+        public string Code { get; set; } = "";
+        public string Name { get; set; } = "";
+        public string Pwd { get; set; } = "";
 
         public int Age { get; set; }
 

EFCore7Study.WebApi/Controllers/AccountsController.cs

@@ -0,0 +1,26 @@
+using EFCore7Study.DataService;
+using EFCore7Study.DataService.Models;
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+
+namespace EFCore7Study.WebApi.Controllers
+{
+    [Route("api/[controller]/[action]")]
+    [ApiController]
+    public class AccountsController : ControllerBase
+    {
+        private readonly AppDbContext _dbContext;
+
+        public AccountsController(AppDbContext context)
+        {
+            _dbContext = context;
+        }
+
+        [HttpGet]
+        public List<Account> AllAccounts()
+        {
+            return _dbContext.Accounts.ToList();
+        }
+    }
+}

EFCore7Study.WebApi/Controllers/EFCore2Controller.cs

@@ -0,0 +1,43 @@
+using EFCore7Study.DataService;
+using EFCore7Study.DataService.Models;
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Internal;
+
+namespace EFCore7Study.WebApi.Controllers
+{
+    [Route("api/[controller]/[action]")]
+    [ApiController]
+    public class EFCore2Controller : ControllerBase
+    {
+        private readonly AppDbContext2 _context;
+        private readonly IDbContextFactory<AppDbContext2> _factory;
+
+        public EFCore2Controller
+        (
+            AppDbContext2 context,
+            IDbContextFactory<AppDbContext2> factory
+        )
+        {
+            _context = context;
+            _factory = factory;
+        }
+
+        [HttpGet]
+        public List<Account> GetAll()
+        {
+            return _context.Accounts.AsNoTracking().ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAllByFactory()
+        {
+            using (var db = _factory.CreateDbContext())
+            {
+                return db.Accounts.AsNoTracking().ToList();
+            }
+        }
+    }
+}

EFCore7Study.WebApi/Controllers/EFCore3Controller.cs

@@ -0,0 +1,60 @@
+using EFCore7Study.DataService;
+using EFCore7Study.DataService.Models;
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Internal;
+
+namespace EFCore7Study.WebApi.Controllers
+{
+    [Route("api/[controller]/[action]")]
+    [ApiController]
+    public class EFCore3Controller : ControllerBase
+    {
+
+        private readonly IDbContextFactory<AppDbContext3> _contextFactory;
+
+        public EFCore3Controller(IDbContextFactory<AppDbContext3> contextFactory)
+        {
+            _contextFactory = contextFactory;
+        }
+
+
+        [HttpGet]
+        public List<Account> GetAll()
+        {
+            return _contextFactory.CreateDbContext().Accounts.ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAll2()
+        {
+            return _contextFactory.CreateDbContext().Accounts.ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAll3()
+        {
+            return _contextFactory.CreateDbContext().Accounts.ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAll4()
+        {
+            return _contextFactory.CreateDbContext().Accounts.ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAll5()
+        {
+            return _contextFactory.CreateDbContext().Accounts.ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAll6()
+        {
+            return _contextFactory.CreateDbContext().Accounts.ToList();
+        }
+    }
+}

EFCore7Study.WebApi/Controllers/EFCoreController.cs

@@ -0,0 +1,63 @@
+using EFCore7Study.DataService;
+using EFCore7Study.DataService.Models;
+
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace EFCore7Study.WebApi.Controllers
+{
+    [Route("api/[controller]/[action]")]
+    [ApiController]
+    public class EFCoreController : ControllerBase
+    {
+        private readonly AppDbContext _connect;
+        private readonly IDbContextFactory<AppDbContext> _factory;
+
+        public EFCoreController(AppDbContext context, IDbContextFactory<AppDbContext> factory)
+        {
+            _connect = context;
+            _factory = factory;
+        }
+
+
+        [HttpGet]
+        public List<Account> GetAll()
+        {
+            return _connect.Accounts.ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAllByFactory()
+        {
+            using (var db = _factory.CreateDbContext())
+            {
+                return db.Accounts.ToList();
+            }
+        }
+
+        [HttpGet]
+        public List<Account> GetAll3()
+        {
+            return _connect.Accounts.ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAll4()
+        {
+            return _connect.Accounts.ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAll5()
+        {
+            return _connect.Accounts.ToList();
+        }
+
+        [HttpGet]
+        public List<Account> GetAll6()
+        {
+            return _connect.Accounts.ToList();
+        }
+    }
+}

EFCore7Study.WebApi/EFCore7Study.WebApi.csproj

@@ -12,4 +12,8 @@
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\EFCore7Study.DataService\EFCore7Study.DataService.csproj" />
+  </ItemGroup>
+
 </Project>

EFCore7Study.WebApi/Program.cs

@@ -1,3 +1,7 @@
+using EFCore7Study.DataService;
+
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.SqlServer;
 
 namespace EFCore7Study.WebApi
 {
@@ -14,9 +18,132 @@ namespace EFCore7Study.WebApi
             builder.Services.AddEndpointsApiExplorer();
             builder.Services.AddSwaggerGen();
 
-            var app = builder.Build();
+            //注册服务：EFCore
+            #region 注册服务：EFCore
+            var connectString = builder.Configuration.GetConnectionString("SQLServer");
+            var contextOptionsBuilder = new DbContextOptionsBuilder<AppDbContext>()
+                .UseSqlServer(connectString)
+                .EnableSensitiveDataLogging();
+            var contextOptions = contextOptionsBuilder.Options;
+
+            //方式一：默认构造，使用内部数据连接
+            //builder.Services.AddScoped(provider => new AppDbContext());
+
+            //方式二: 设置连接字符串属性
+            //builder.Services.AddScoped(provider =>
+            //{
+            //    var db = new AppDbContext();
+            //    db.ConnectString = connectString;
+            //    return db;
+            //});
+
+            //方法三：使用 DbContextOptions 的构建函数 [比较推荐]
+            //builder.Services.AddScoped<AppDbContext>(provider => new AppDbContext(contextOptions));
+
+            //方式四：使用 AddDbContext 扩展方法 [官方推荐]
+            //小问题：会覆盖之前方法的服务注册，猜测内部进行过去重复处理过，要验证请使用 GetServices 获取所有注册的服务。
+            //解决：方法三放在方法四后面
+            //builder.Services.AddDbContext<AppDbContext>(option =>
+            //{
+            //    //从配置中获取连接字符串
+            //    option.UseSqlServer(connectString)
+            //        .EnableSensitiveDataLogging();
+            //});
+
+            //方式五: 使用 DbContextFactory 工厂
+            //注意：
+            //  1、此方法与方法四都是注册的 AppDbContext对象，方法四默认为Scoped,此方式默认为单例，两者的冲突导致异常
+            //  2、此方法与方法四，都会覆盖之前的 AppDbContext 注册
+            //解决：
+            //  1、此方法不与方法4同用，如果要同时使用，请使用方法1-3
+            //  2、使此方法与方法四，应用相同生命周期
+            //builder.Services.AddDbContextFactory<AppDbContext>(optionBuilder =>
+            //{
+            //    optionBuilder.UseSqlServer(connectString)
+            //       .EnableSensitiveDataLogging();
+            //});
+
+            //使用自定的覆盖工厂的AppDbContext,但工厂本身的IDbContextFactory<AppDbContext>不会覆盖，可以分开使用。
+            //builder.Services.AddScoped<AppDbContext>(provider => new AppDbContext(contextOptions));
+
+            //方式六：使用 DbContextPool 池
+            builder.Services.AddDbContextPool<AppDbContext>((provider, optionBuilder) =>
+            {
+                //provider.GetRequiredService<AppDbContext>();
+                optionBuilder.UseSqlServer(connectString)
+                   .EnableSensitiveDataLogging();
+            }, poolSize: 2048);
+
+            //方式七：使用连接池的工厂
+            builder.Services.AddPooledDbContextFactory<AppDbContext>((serviceProvider, optionBuilder) =>
+            {
+                //serviceProvider.GetRequiredService<AppDbContext>();
+
+                optionBuilder.UseSqlServer(connectString)
+                   .EnableSensitiveDataLogging();
+            }, poolSize: 1024);
+
+            //使用自定的覆盖工厂的AppDbContext,但工厂本身的IDbContextFactory<AppDbContext>不会覆盖，可以分开使用。
+            builder.Services.AddScoped(provider => new AppDbContext());
+
+            //获取所有注册的服务(可没查看是否覆盖注册)
+            //var dd = builder?.Services?.BuildServiceProvider().GetServices<AppDbContext>();
+            #endregion
+
+            #region 注册服务：EFCore2
+
+            var contextOptionBuilder2 = new DbContextOptionsBuilder<AppDbContext2>()
+                .UseSqlServer(connectString)
+                .EnableSensitiveDataLogging();
+            DbContextOptions<AppDbContext2>? contextOptions2 = contextOptionBuilder2.Options;
+
+            //方法：使用 统一构建函数
+            //builder.Services.AddScoped<AppDbContext2>(provider => new AppDbContext2(contextOptions));
+            //或者
+            builder?.Services.AddScoped(provider => new AppDbContext2(contextOptions2, connectString));
+
+            //方式：使用 AddDbContext 扩展方法 [官方推荐]
+            //builder.Services.AddDbContext<AppDbContext2>((server, option) =>
+            //{
+            //    //从配置中获取连接字符串
+            //    //builder.Configuration.GetConnectionString("SQLServer");
+
+            //    //设置
+            //    option.UseSqlServer(connectString)
+            //        .EnableSensitiveDataLogging();
+            //});
+
+            //方式: 使用 DbContextFactory 工厂
+            //builder.Services.AddDbContextFactory<AppDbContext2>(optionBuilder =>
+            //{
+            //    optionBuilder.UseSqlServer(connectString)
+            //       .EnableSensitiveDataLogging();
+            //}, ServiceLifetime.Scoped);
+
+            //或者
+            //builder.Services.AddDbContextFactory<AppDbContext2>((provider, builder) =>
+            //{
+
+
+            //}, ServiceLifetime.Scoped);
+
+            //方式：使用 DbContextPool 池
+            //builder.Services.AddDbContextPool<AppDbContext2>(optionBuilder =>
+            //{
+            //    optionBuilder.UseSqlServer(connectString)
+            //       .EnableSensitiveDataLogging();
+            //});
+
+            //方式：使用连接池的工厂
+            //builder.Services.AddPooledDbContextFactory<AppDbContext2>(optionBuilder =>
+            //{
+            //    optionBuilder.UseSqlServer(connectString)
+            //       .EnableSensitiveDataLogging();
+            //});
+            #endregion
+
+            var app = builder!.Build();
 
-            // Configure the HTTP request pipeline.
             if (app.Environment.IsDevelopment())
             {
                 app.UseSwagger();

EFCore7Study.WebApi/appsettings.json

@@ -5,5 +5,8 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "ConnectionStrings": {
+    "SQLServer": "Server=127.0.0.1\\SQL2019;Database=EFCore7Study;User Id=sa;Password=gly-bicijinlian;Encrypt=True;TrustServerCertificate=True;"
+  }
 }