集合

LinqStudy.Test/LinqToObject/AggregationTest.cs

@@ -26,7 +26,7 @@ namespace LinqStudy.Test.LinqToObject
             {
                 new Person(){ Id=1, Name="张三丰", Age=230},
                 new Person(){ Id=2, Name="小龙女", Age=28},
-                new Person(){ Id=3, Name="银花公主", Age=16},
+                new Person(){ Id=3, Name="云花公主", Age=16},
                 new Person(){ Id=4, Name="杨过", Age=32},
                 //new Person(){ Id=5, Name="东方不败", Age=86},
                 //new Person(){ Id=6, Name="金轮法王", Age=64},
@@ -43,7 +43,7 @@ namespace LinqStudy.Test.LinqToObject
             //       由于第4项是最后一项，整个“聚合操作”结束，返回本次“聚合项”作为最后的输出。
             var agg = peoples.Aggregate
             (
-                (aggregateItem, next) => 
+                (aggregateItem, next) =>
                 {
                     //把当前元素的年龄加到返回的“聚合项”的年龄，
                     //最后的聚合项的年龄就是“总年龄”。
@@ -70,11 +70,11 @@ namespace LinqStudy.Test.LinqToObject
             {
                 new Person(){ Id=1, Name="张三丰", Age=230},
                 new Person(){ Id=2, Name="小龙女", Age=28},
-                new Person(){ Id=3, Name="银花公主", Age=16},
+                new Person(){ Id=3, Name="云花公主", Age=16},
                 new Person(){ Id=4, Name="杨过", Age=32},
             };
 
-            var seed =0;
+            var seed = 0;
 
             //因为指定了初始聚合项，一共执行了4次“聚合操作”即每一项执行一次“聚合操作”
             var agg = peoples.Aggregate
@@ -82,9 +82,9 @@ namespace LinqStudy.Test.LinqToObject
                 seed,
                 (accumulate, currentItem) =>
                 {
-                    return accumulate + currentItem.Age; 
+                    return accumulate + currentItem.Age;
                 }
-             ) ;
+             );
 
             var totalAge = agg;
             var expectedAge = 230 + 28 + 16 + 32;
@@ -102,7 +102,7 @@ namespace LinqStudy.Test.LinqToObject
             {
                 new Person(){ Id=1, Name="张三丰", Age=230},
                 new Person(){ Id=2, Name="小龙女", Age=28},
-                new Person(){ Id=3, Name="银花公主", Age=16},
+                new Person(){ Id=3, Name="云花公主", Age=16},
                 new Person(){ Id=4, Name="杨过", Age=32},
             };
 
@@ -121,11 +121,11 @@ namespace LinqStudy.Test.LinqToObject
                 },
 
                 //改变最后聚合结果，并返回。
-                accumulateItem => "总年龄为："+ accumulateItem.ToString()
+                accumulateItem => "总年龄为：" + accumulateItem.ToString()
              );
 
             var totalAge = agg;
-            var expectedAge = "总年龄为："+ (230 + 28 + 16 + 32).ToString();
+            var expectedAge = "总年龄为：" + (230 + 28 + 16 + 32).ToString();
 
             Assert.Equal(expectedAge.ToString(), totalAge);
         }
@@ -138,14 +138,14 @@ namespace LinqStudy.Test.LinqToObject
         {
             List<Person> peoples = new List<Person>();
 
-            Action act =() => peoples.Aggregate
-            (
-                (aggregateItem, next) =>
-                {
-                    next.Age = next.Age + aggregateItem.Age;
-                    return next;
-                }
-             );
+            Action act = () => peoples.Aggregate
+             (
+                 (aggregateItem, next) =>
+                 {
+                     next.Age = next.Age + aggregateItem.Age;
+                     return next;
+                 }
+              );
 
             Assert.Throws<InvalidOperationException>(act);
         }
@@ -204,7 +204,7 @@ namespace LinqStudy.Test.LinqToObject
                 new Person(){ Id=4, Name="杨过", Age=32},
             };
 
-            var count = peoples.Count(p=>p.Age>28);
+            var count = peoples.Count(p => p.Age > 28);
             var expected = 1;
 
             Assert.Equal(count, expected);
@@ -262,7 +262,7 @@ namespace LinqStudy.Test.LinqToObject
             {
                 new Person(){ Id=1, Name="张三丰", Age=230},
                 new Person(){ Id=2, Name="小龙女", Age=28},
-                new Person(){ Id=3, Name="银花公主", Age=16},
+                new Person(){ Id=3, Name="云花公主", Age=16},
                 new Person(){ Id=4, Name="杨过", Age=32},
                 new Person(){ Id=5, Name="东方不败", Age=86},
                 new Person(){ Id=6, Name="金轮法王", Age=64},
@@ -286,7 +286,7 @@ namespace LinqStudy.Test.LinqToObject
         {
             List<Person> peoples = new List<Person>()
             {
-                
+
             };
 
             Action act = () => peoples.Max(p => p.Age);
@@ -307,7 +307,7 @@ namespace LinqStudy.Test.LinqToObject
             {
                 new Person(){ Id=1, Name="张三丰", Age=230},
                 new Person(){ Id=2, Name="小龙女", Age=28},
-                new Person(){ Id=3, Name="银花公主", Age=16},
+                new Person(){ Id=3, Name="云花公主", Age=16},
                 new Person(){ Id=4, Name="杨过", Age=32},
                 new Person(){ Id=5, Name="东方不败", Age=86},
                 new Person(){ Id=6, Name="金轮法王", Age=64},

LinqStudy.Test/LinqToObject/ConcatTest.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+
+using Xunit;
+using LinqStudy;
+
+namespace LinqStudy.Test.LinqToObject
+{
+    ///<summary>
+    /// 串联操作
+    ///<summary>
+    public class ConcatTest
+    {
+        ///<summary>
+        /// Concat：将两个序列合并成一个序列，不去重。与Union不同。
+        ///<summary>
+        public void Concat_Test()
+        {
+            List<Person> peoples1 = new List<Person>()
+            {
+                new Person(){ Id=2, Name="小龙女", Age=28},
+                new Person(){ Id=4, Name="杨过", Age=32},
+            };
+
+            List<Person> peoples2 = new List<Person>()
+            {
+                new Person(){ Id=2, Name="小龙女", Age=28},
+                new Person(){ Id=3, Name="云花公主", Age=16},
+            };
+
+            var concatAct = peoples1.Concat(peoples2);
+
+            var totalCount = concatAct.Count();
+
+            Assert.Equal(4, totalCount);
+        }
+    }
+}

LinqStudy.Test/LinqToObject/SetsTest.cs

@@ -122,7 +122,7 @@ namespace LinqStudy.Test.LinqToObject
         {
             var p1 = new Person() { Id = 1, Name = "杨过", Age = 32 };
             var p2 = new Person() { Id = 2, Name = "小龙女", Age = 28 };
-            var p3 = new Person() { Id = 3, Name = "银花公主", Age = 16 };
+            var p3 = new Person() { Id = 3, Name = "云花公主", Age = 16 };
 
             List<Person> peoples1 = new List<Person>()
             {
@@ -155,7 +155,7 @@ namespace LinqStudy.Test.LinqToObject
             {
                 new Person(){ Id=1, Name="张三丰", Age=230},
                 new Person(){ Id=2, Name="小龙女", Age=28},
-                new Person(){ Id=3, Name="银花公主", Age=16},
+                new Person(){ Id=3, Name="云花公主", Age=16},
                 new Person(){ Id=4, Name="杨过", Age=32},
             };
 
@@ -222,5 +222,59 @@ namespace LinqStudy.Test.LinqToObject
             Assert.Throws<ArgumentNullException>(act);
         }
         #endregion
+
+        #region Intersect
+
+        ///<summary>
+        /// Intersect: 取交集
+        ///</summary>
+        [Fact]
+        public void Intersect_Test()
+        {
+            var p1 = new Person() { Id = 1, Name = "杨过", Age = 32 };
+            var p2 = new Person() { Id = 2, Name = "小龙女", Age = 28 };
+            var p3 = new Person() { Id = 3, Name = "云花公主", Age = 16 };
+
+            List<Person> peoples1 = new List<Person>()
+            {
+                p1,p2,
+            };
+
+            List<Person> peoples2 = new List<Person>()
+            {
+                p1,p3,
+            };
+
+            var intesectItem = peoples1.Intersect(peoples2);
+            var itemCount = intesectItem.Count();
+
+            Assert.Equal(1, itemCount);
+        }
+
+        ///<summary>
+        /// 引用类型：使用
+        ///</sumaary>
+        [Fact]
+        public void Intersect_Reference_Test()
+        {
+            List<Person> peoples1 = new List<Person>()
+            {
+                new Person(){ Id=1, Name="杨过", Age=32},
+                new Person(){ Id=2, Name="小龙女", Age=28},
+
+            };
+
+            List<Person> peoples2 = new List<Person>()
+            {
+                new Person(){ Id=2, Name="小龙女", Age=28},
+                new Person(){ Id=3, Name="云花公主", Age=16},
+            };
+
+            //虽然两个“小龙女”属性相同，但不是一个对象，没有交集。
+            var intesectItem = peoples1.Intersect(peoples2);
+
+            Assert.Empty(intesectItem);
+        }
+        #endregion
     }
 }