Object Initializers
Object Initializer的使用很简单:在通过new 关键字创建对象的时候,将所需的Proeprty置于Type name后的{}中。比如:
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class staff
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{
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public string Name { get; set; }
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public int Age{get; set;}
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public string Add;
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public staff()
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{ }
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public staff(int i, string s)
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{
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Name = s;
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Age = i;
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}
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}
使用对象初始化器 ![](/Images/OutliningIndicators/None.gif)
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Console.WriteLine("Initializer");
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staff s1 = new staff(12, "sss") { Name = "GUOJUN" };
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staff s3 = new staff(12, "sss") { Name = "GUOJUN", Age = 27,Add="HuBei" };
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staff s2 = new staff { Name = "IORI", Age = 27 };
在上面的例子中,我们通过一句代码(staff s1 = new staff(12, "sss") { Name = "GUOJUN" };)实现对staff 对象的创建和初始化。![](/Images/OutliningIndicators/None.gif)
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注意:
在使用对象初始化器时,隐式的调用了默认的构造函数(例如S2的创建及初始化)。
在使用对象初始化器时,也可以指定调用任何自定义的构造函数。(例如S1,S3的创建及初始化)。
可以一次为多个(不一定要全部)属性赋值,
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staff s1 = new staff(12, "sss") { Name = "GUOJUN" };
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staff s3 = new staff(12, "sss") { Name = "GUOJUN", Age = 27,Add="HuBei" };
C# 3.x这些Feature仅仅是基于一种Programming Language层面的新特性而已,这些特性通过Programming Language对应的Compiler在编译过程添加一些辅助的Code来实现。 通过编译我们看看变成什么样子:![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
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public static void fnInitializer()
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{
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Console.WriteLine("Initializer");
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staff <>g__initLocal3 = new staff(12, "sss");
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<>g__initLocal3.Name = "GUOJUN";
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staff s1 = <>g__initLocal3;
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staff <>g__initLocal4 = new staff(12, "sss");
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<>g__initLocal4.Name = "GUOJUN";
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<>g__initLocal4.Age = 0x1b;
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<>g__initLocal4.Add = "HuBei";
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staff s3 = <>g__initLocal4;
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staff <>g__initLocal5 = new staff();
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<>g__initLocal5.Name = "IORI";
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<>g__initLocal5.Age = 0x1b;
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staff s2 = <>g__initLocal5;
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Console.WriteLine(s1.Name);
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Console.WriteLine(s1.Age);
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Console.WriteLine(s2.Name);
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}
我想上面的代码就不用我太多的说明,大家一定明白。我只说明一点:
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Collection Initializer
使用集合初始化器,如下:
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List<staff> myListOfstaff = new List<staff>
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{
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new staff {Name = "GUOJUN", Age = 27 },
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new staff {Name = "IORI", Age = 27 },
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new staff(12, "sss") { Name = "GUOJUN" }
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};
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foreach (staff pt in myListOfstaff)
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{
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Console.WriteLine(pt);
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}
分析Object Initializer的本质一样,我们之后看看通过Compiler变异后的Code是什么样子,就会对Collection Initializer的实现有一个全面的了解: ![](/Images/OutliningIndicators/None.gif)
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List<staff> <>g__initLocal6 = new List<staff>();
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staff <>g__initLocal7 = new staff();
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<>g__initLocal7.Name = "GUOJUN";
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<>g__initLocal7.Age = 0x1b;
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<>g__initLocal6.Add(<>g__initLocal7);
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staff <>g__initLocal8 = new staff();
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<>g__initLocal8.Name = "IORI";
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<>g__initLocal8.Age = 0x1b;
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<>g__initLocal6.Add(<>g__initLocal8);
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staff <>g__initLocal9 = new staff(12, "sss");
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<>g__initLocal9.Name = "GUOJUN";
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<>g__initLocal6.Add(<>g__initLocal9);
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List<staff> myListOfstaff = <>g__initLocal6;
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foreach (staff pt in myListOfstaff)
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{
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Console.WriteLine(pt);
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}
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Collection Initializer的实现和Object Initializer很类似。
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