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      1. 为什么不能将 .NET 委托声明为静态的?

        时间:2023-11-11

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                1. 本文介绍了为什么不能将 .NET 委托声明为静态的?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  当我尝试编译以下内容时:

                  When I try to compile the following:

                  public static delegate void MoveDelegate (Actor sender, MoveDirection args);
                  

                  我收到一个错误消息:修饰符 'static' 对该项目无效."

                  I receive, as an error: "The modifer 'static' is not valid for the this item."

                  我在一个单例中实现这个,有一个单独的类调用委托.问题是当我在另一个类中使用单例实例来调用委托时(从标识符,而不是类型),无论出于何种原因,我都不能这样做,即使我声明委托是非静态的.显然,只有当且仅当委托是静态的时,我才能通过类型直接引用它.

                  I'm implementing this within a singleton, with a separate class which calls the delegate. The problem is that when I use the singleton instance within the other class to call the delegate (from the identifier, not the type), I can't do that for whatever reason, even when I declare the delegate non-static. Obviously, I can only refer to it via the type directly if and only if the delegate is static.

                  这背后的原因是什么?我正在使用 MonoDevelop 2.4.2.

                  What is the reasoning behind this? I am using MonoDevelop 2.4.2.

                  更新

                  在尝试使用以下代码的建议之一后:

                  After trying one of the suggestions with the following code:

                  public void Move(MoveDirection moveDir)
                  {
                      ProcessMove(moveDir);
                  }
                  
                  public void ProcessMove(MoveDirection moveDir)
                  {
                      Teleporter.MoveMethod mm = new Teleporter.MoveMethod(Move); 
                      moveDelegate(this, moveDir);
                  }
                  

                  我收到一个处理错误,指出 MoveMethod 必须是一个类型,而不是一个标识符.

                  I've received a processing error, which states that the MoveMethod must be a type, and not an identifier.

                  推荐答案

                  试试这个:

                  public delegate void MoveDelegate(object o);
                  public static MoveDelegate MoveMethod;
                  

                  所以方法变量可以定义为静态的.static 关键字对于 delegate 定义没有意义,就像 enumconst 定义一样.

                  So the method-variable can be defined static. The keyword static has no meaning for the delegate definition, just like enum or const definitions.

                  如何分配静态方法字段的示例:

                  An example of how to assign the static method-field:

                  public class A
                  {
                    public delegate void MoveDelegate(object o);
                    public static MoveDelegate MoveMethod;
                  }
                  
                  public class B
                  {
                    public static void MoveIt(object o)
                    {
                      // Do something
                    }    
                  }
                  
                  public class C
                  {
                    public void Assign()
                    {
                      A.MoveMethod = B.MoveIt;
                    }
                  
                    public void DoSomething()
                    {
                      if (A.MoveMethod!=null)
                        A.MoveMethod(new object()); 
                    }
                  }
                  

                  这篇关于为什么不能将 .NET 委托声明为静态的?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持跟版网!

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