添加项目

LinqStudy.Test/LinqStudy.Test.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.2</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <Folder Include="ExpressionTree\" />
+    <Folder Include="LinqBase\" />
+    <Folder Include="LinqToDataSet\" />
+    <Folder Include="LinqToObject\" />
+    <Folder Include="LinqToSQL\" />
+    <Folder Include="LinqToXml\" />
+    <Folder Include="Util\" />
+  </ItemGroup>
+
+</Project>

LinqStudy.Test/UseXUnit.cs

@@ -0,0 +1,14 @@
+using System;
+using Xunit;
+
+namespace LinqStudy.Test
+{
+    public class UseXUnit
+    {
+        [Fact]
+        public void Test1()
+        {
+            Assert.True(true,"使用xunit框架！");
+        }
+    }
+}

LinqStudy.sln

@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29215.179
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LinqStudy", "LinqStudy\LinqStudy.csproj", "{5867719F-953F-4216-B245-4937B9DCF997}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LinqStudy.Test", "LinqStudy.Test\LinqStudy.Test.csproj", "{8DC599B0-ADE6-4DBA-9CDC-3094A6DCCBFA}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{5867719F-953F-4216-B245-4937B9DCF997}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{5867719F-953F-4216-B245-4937B9DCF997}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{5867719F-953F-4216-B245-4937B9DCF997}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{5867719F-953F-4216-B245-4937B9DCF997}.Release|Any CPU.Build.0 = Release|Any CPU
+		{8DC599B0-ADE6-4DBA-9CDC-3094A6DCCBFA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8DC599B0-ADE6-4DBA-9CDC-3094A6DCCBFA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8DC599B0-ADE6-4DBA-9CDC-3094A6DCCBFA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8DC599B0-ADE6-4DBA-9CDC-3094A6DCCBFA}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {D1EC77AC-9C45-43F0-9386-1D9BD5C039F2}
+	EndGlobalSection
+EndGlobal

LinqStudy/Class1.cs

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+using System;
+
+namespace LinqStudy
+{
+    public class Class1
+    {
+    }
+}

LinqStudy/LinqStudy.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="Util\" />
+    <Folder Include="LinqToObject\" />
+    <Folder Include="LinqBase\" />
+    <Folder Include="LinqToXml\" />
+    <Folder Include="LinqToDataSet\" />
+    <Folder Include="LinqToSQL\" />
+    <Folder Include="ExpressionTree\" />
+  </ItemGroup>
+
+</Project>