From 631f2cea14c6ec00a4b513308ec527dd6990b112 Mon Sep 17 00:00:00 2001
From: bicijinlian <bicijinlian@163.com>
Date: Sun, 8 Sep 2019 22:59:16 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E5=8F=8D=E5=BA=8F?=
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---
LinqStudy.Test/LinqToObject/OrderTest.cs | 131 +++++++++++++++++------
1 file changed, 99 insertions(+), 32 deletions(-)
diff --git a/LinqStudy.Test/LinqToObject/OrderTest.cs b/LinqStudy.Test/LinqToObject/OrderTest.cs
index 96ae0f3..f74bec9 100644
--- a/LinqStudy.Test/LinqToObject/OrderTest.cs
+++ b/LinqStudy.Test/LinqToObject/OrderTest.cs
@@ -24,18 +24,15 @@ namespace LinqStudy.Test.LinqToObject
{
List<Person> peoples = new List<Person>()
{
- new Person(){ Id = 1, Name = "张三", Age=33 },
- new Person(){ Id = 3, Name = "李四", Age=65 },
- new Person(){ Id = 2, Name = "王五", Age=17 },
+ new Person(){ Id = 3, Name = "张三", Age=33 },
+ new Person(){ Id = 5, Name = "王五", Age=55 },
+ new Person(){ Id = 4, Name = "李四", Age=44 },
};
var oprationItem = peoples.OrderBy(p => p.Id);
+ var firtName = oprationItem.First().Name;
- var firtId = oprationItem.First().Id;
- var lastId = oprationItem.Last().Id;
-
- Assert.Equal(1,firtId);
- Assert.Equal(3, lastId);
+ Assert.Equal("张三", firtName);
}
/// <summary>
@@ -46,21 +43,22 @@ namespace LinqStudy.Test.LinqToObject
{
List<Person> peoples = new List<Person>()
{
- new Person(){ Id = 1, Name = "张三", Age=33 },
- new Person(){ Id = 3, Name = "李四", Age=65 },
- new Person(){ Id = 2, Name = "王五", Age=17 },
+ new Person(){ Id = 3, Name = "张三", Age=33 },
+ new Person(){ Id = 5, Name = "王五", Age=55 },
+ new Person(){ Id = 4, Name = "李四", Age=44 },
};
var oprationItem = peoples.OrderBy(p => p.Id);
- var addItem = new Person() { Id = 4, Name = "赵立", Age = 87 };
- peoples.Add(addItem);
+ peoples.Insert(0, new Person() { Id = 6, Name = "赵六", Age = 66 });
- var firtId = oprationItem.First().Id;
- var lastId = oprationItem.Last().Id;
+ //执行一次排序
+ var firtName = oprationItem.First().Name;
+ //再执行一次排序
+ var lastName = oprationItem.Last().Name;
- Assert.Equal(1, firtId);
- Assert.Equal(4, lastId);
+ Assert.Equal("张三", firtName);
+ Assert.Equal("王五", lastName);
}
/// <summary>
@@ -124,7 +122,7 @@ namespace LinqStudy.Test.LinqToObject
var oprationItem = peoples.OrderByDescending(p => p.Id);
- var addItem = new Person() { Id = 4, Name = "赵立", Age = 87 };
+ var addItem = new Person() { Id = 4, Name = "赵六", Age = 87 };
peoples.Add(addItem);
var firtId = oprationItem.First().Id;
@@ -169,12 +167,12 @@ namespace LinqStudy.Test.LinqToObject
new Person(){ Id = 1, Name = "张三", Age=44 },
new Person(){ Id = 1, Name = "李四", Age=33 },
new Person(){ Id = 2, Name = "王五", Age=22 },
- new Person(){ Id = 2, Name = "赵立", Age=11 },
+ new Person(){ Id = 2, Name = "赵六", Age=11 },
};
//先按Id排序，Id相同的，再按年龄排序。
var oprationItem = peoples.OrderBy(p => p.Id).ThenBy(p => p.Age).Select(p => p.Name);
- var expected = new List<string>() { "李四", "张三", "赵立", "王五" };
+ var expected = new List<string>() { "李四", "张三", "赵六", "王五" };
Assert.Equal(expected, oprationItem);
}
@@ -190,16 +188,16 @@ namespace LinqStudy.Test.LinqToObject
new Person(){ Id = 1, Name = "张三", Age=44 },
new Person(){ Id = 1, Name = "李四", Age=33 },
new Person(){ Id = 2, Name = "王五", Age=22 },
- new Person(){ Id = 2, Name = "赵立", Age=11 },
+ new Person(){ Id = 2, Name = "赵六", Age=11 },
};
var oprationItem = peoples.OrderBy(p => p.Id).ThenBy(p => p.Age);
-
+
var addItme = new Person() { Id = 1, Name = "刘能", Age = 2 };
peoples.Add(addItme);
var actual = oprationItem.Select(p => p.Name).ToList();
- var expected = new List<string>() { "刘能", "李四", "张三", "赵立", "王五" };
+ var expected = new List<string>() { "刘能", "李四", "张三", "赵六", "王五" };
Assert.Equal(expected, actual);
}
@@ -215,13 +213,13 @@ namespace LinqStudy.Test.LinqToObject
new Person(){ Id = 1, Name = "张三", Age=44 },
new Person(){ Id = 1, Name = "李四", Age=33 },
new Person(){ Id = 2, Name = "王五", Age=22 },
- new Person(){ Id = 2, Name = "赵立", Age=11 },
+ new Person(){ Id = 2, Name = "赵六", Age=11 },
};
- var oprationItem = peoples.OrderBy(p => p, new PersonComparer()).ThenBy(p=>p.Age,Comparer<int>.Default);
+ var oprationItem = peoples.OrderBy(p => p, new PersonComparer()).ThenBy(p => p.Age, Comparer<int>.Default);
var actual = oprationItem.Select(p => p.Name).ToList();
- var expected = new List<string>() {"李四", "张三", "赵立", "王五" };
+ var expected = new List<string>() { "李四", "张三", "赵六", "王五" };
Assert.Equal(expected, actual);
}
@@ -239,12 +237,12 @@ namespace LinqStudy.Test.LinqToObject
new Person(){ Id = 1, Name = "张三", Age=44 },
new Person(){ Id = 1, Name = "李四", Age=33 },
new Person(){ Id = 2, Name = "王五", Age=22 },
- new Person(){ Id = 2, Name = "赵立", Age=11 },
+ new Person(){ Id = 2, Name = "赵六", Age=11 },
};
//先按Id排序，Id相同的，再按年龄排序。
var oprationItem = peoples.OrderBy(p => p.Id).ThenByDescending(p => p.Age).Select(p => p.Name);
- var expected = new List<string>() {"张三","李四","王五", "赵立"};
+ var expected = new List<string>() { "张三", "李四", "王五", "赵六" };
Assert.Equal(expected, oprationItem);
}
@@ -260,7 +258,7 @@ namespace LinqStudy.Test.LinqToObject
new Person(){ Id = 1, Name = "张三", Age=44 },
new Person(){ Id = 1, Name = "李四", Age=33 },
new Person(){ Id = 2, Name = "王五", Age=22 },
- new Person(){ Id = 2, Name = "赵立", Age=11 },
+ new Person(){ Id = 2, Name = "赵六", Age=11 },
};
var oprationItem = peoples.OrderBy(p => p.Id).ThenByDescending(p => p.Age);
@@ -269,7 +267,7 @@ namespace LinqStudy.Test.LinqToObject
peoples.Add(addItme);
var actual = oprationItem.Select(p => p.Name).ToList();
- var expected = new List<string>() { "张三", "李四", "刘能", "王五","赵立" };
+ var expected = new List<string>() { "张三", "李四", "刘能", "王五", "赵六" };
Assert.Equal(expected, actual);
}
@@ -285,16 +283,85 @@ namespace LinqStudy.Test.LinqToObject
new Person(){ Id = 1, Name = "张三", Age=44 },
new Person(){ Id = 1, Name = "李四", Age=33 },
new Person(){ Id = 2, Name = "王五", Age=22 },
- new Person(){ Id = 2, Name = "赵立", Age=11 },
+ new Person(){ Id = 2, Name = "赵六", Age=11 },
};
var oprationItem = peoples.OrderBy(p => p, new PersonComparer()).ThenByDescending(p => p.Age, Comparer<int>.Default);
var actual = oprationItem.Select(p => p.Name).ToList();
- var expected = new List<string>() { "张三","李四", "王五", "赵立",};
+ var expected = new List<string>() { "张三", "李四", "王五", "赵六", };
Assert.Equal(expected, actual);
}
#endregion
+
+ #region Resevse
+ /// <summary>
+ /// Resevse：反序序列(逆向)；立即执行
+ /// </summary>
+ [Fact]
+ public void Resevse_Test()
+ {
+ List<Person> peoples = new List<Person>()
+ {
+ new Person(){ Id = 1, Name = "张三", Age=44 },
+ new Person(){ Id = 2, Name = "李四", Age=33 },
+ };
+
+ //简单逆序
+ peoples.Reverse();
+ var firstId = peoples.First().Id;
+
+ Assert.Equal(2, firstId);
+ }
+
+ /// <summary>
+ /// Resevse：反序序列(逆向)；立即执行
+ /// </summary>
+ [Fact]
+ public void Resevse_immediately_Test()
+ {
+ List<Person> peoples = new List<Person>()
+ {
+ new Person(){ Id = 1, Name = "张三", Age=33 },
+ new Person(){ Id = 2, Name = "李四", Age=44 },
+ };
+
+ //简单逆序
+ peoples.Reverse();
+
+ peoples.Add(new Person() { Id = 3, Name = "云花公主", Age = 18 });
+
+ //数据源变化，不影响结果。
+ var firstId = peoples.First().Id;
+
+ Assert.Equal(2, firstId);
+ }
+
+ /// <summary>
+ /// Resevse重载：index开始项，count反序项的数量
+ /// </summary>
+ [Fact]
+ public void Resevse_index_count_Test()
+ {
+ List<Person> peoples = new List<Person>()
+ {
+ new Person(){ Id = 1, Name = "张三", Age=44 },
+ new Person(){ Id = 2, Name = "李四", Age=33 },
+ new Person(){ Id = 3, Name = "王五", Age=44 },
+ new Person(){ Id = 4, Name = "赵六", Age=33 },
+ };
+
+ //从指定位置开始逆序指定数量的项。
+ //从序号为1(第2项)开始，反序2项：即反序第2第3两项。
+ peoples.Reverse(1, 2);
+
+ var secondId = peoples[1].Id;
+ var thirdId = peoples[2].Id;
+
+ Assert.Equal(3, secondId);
+ Assert.Equal(2, thirdId);
+ }
+ #endregion
}
}