为什么在System.Delegate上看不到+ =运算符重载? [英] Why don't I see the += operator overloaded on System.Delegate?

问题描述

我看到相等比较运算符 == 和！= 在 System.Delegate 和 MulticastDelegate 上重载了，但是不是 + = 和-= 运算符.

那么增量分配和减量分配运算符如何在委托实例上工作?

解决方案

C#编译器将 + = 运算符转换为静态方法 Delegate.Combine 的调用./p>

在很多情况下，编译器会执行此类操作，例如 System.String 的 + 运算符被编译为 String.Concat 调用.因此， System.String 中没有 op_Add 方法.

I see the equality comparison operators == and != overloaded on System.Delegate and MulticastDelegate but not the += and -= operators.

Then how do the increment assign and decrement assign operators work on delegate instances?

解决方案

The C# compiler translates += operator to the call of the static method Delegate.Combine.

There are several cases when the compiler does such things, f.e. the + operator of the System.String is compiled to the String.Concat call. Therefore there isn't op_Add method in System.String.

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