You use it to specify the argument and return type of the delegate.
用于指定该委托的参数类型和返回类型。
A delegate is a type that defines a method signature.
委派是定义方法签章的型别。
The declaration of a delegate type is similar to a method signature.
委派型别的宣告与方法签章类似。
The declaration of a delegate type is similar to a method signature.
委派型别的宣告与方法签章类似。
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