c# 中的匿名方法

原文:https://www.geeksforgeeks.org/anonymous-method-in-c-sharp/

匿名方法是在 C# 2.0 中引入的不包含任何名称的方法。当用户想要创建一个内联方法，并且还想像其他方法一样在匿名方法中传递参数时，它非常有用。使用 【委托】 关键字定义匿名方法，用户可以将该方法分配给委托类型的变量。

语法:

delegate(parameter_list){
    // Code..
};

例:

// C# program to illustrate how to 
// create an anonymous function
using System;

class GFG {

    public delegate void petanim(string pet);

    // Main method
    static public void Main()
    {

        // An anonymous method with one parameter
        petanim p = delegate(string mypet)
        {
            Console.WriteLine("My favorite pet is: {0}",
                                                 mypet);
        };
        p("Dog");
    }
}

输出:

My favorite pet is: Dog

要点:

这种方法也被称为内联委托。
使用此方法，您可以创建委托对象，而无需编写单独的方法。
This method can access variable present in the outer method. Such type of variables is known as Outer variables. As shown in the below example fav is the outer variable.

示例:

```cs // C# program to illustrate how an // anonymous function access variable // defined in outer method using System;

class GFG {

// Create a delegate     public delegate void petanim(string pet);

// Main method     static public void Main()     {

string fav = "Rabbit";

// Anonymous method with one parameter         petanim p = delegate(string mypet)         {             Console.WriteLine("My favorite pet is {0}.",                                                  mypet);

// Accessing variable defined             // outside the anonymous function             Console.WriteLine("And I like {0} also.", fav);         };         p("Dog");     } } ```

输出:

```cs My favorite pet is Dog. And I like Rabbit also.

```
您可以将此方法传递给另一个接受委托作为参数的方法。如下例所示:

例:

```cs // C# program to illustrate how an // anonymous method passed as a parameter using System;

public delegate void Show(string x);

class GFG {

// identity method with two parameters     public static void identity(Show mypet,                               string color)     {         color = " Black" + color;         mypet(color);     }

// Main method     static public void Main()     {

// Here anonymous method pass as         // a parameter in identity method         identity(delegate(string color) {            Console.WriteLine("The color"+            " of my dog is {0}", color); },                                  "White");     } } ```

输出:

```cs The color of my dog is BlackWhite

```
In anonymous methods, the parameter list is allowed to be deleted, which means that anonymous methods can be converted into delegates.
Anonymous method block refers to the range of parameters in anonymous methods.
Anonymous methods do not contain jump statements such as goto, break or continue.
Anonymous methods do not access unsafe code.
Anonymous methods do not access the in, ref, and out parameters of the external scope.
You cannot use anonymous methods to the left of the is operator.
也可以使用匿名方法作为事件处理程序。

例:

cs // C# program to illustrate how an // anonymous method use as a // event handler MyButton.Click += delegate(Object obj, EventArgs ev) { System.Windows.Forms.MessageBox.Show("Complete without error...!!"); }

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c#中的匿名方法

c# 中的匿名方法