在方法重载通用约束上 [英] Generic contraints on method overloads

问题描述

我有一些通用的方法的接口，我想用重载来实现的方法是接受一个类的实例，或它的PK值（或者是一个int或GUID但有所不同）。

I've got an interface with some generic methods, and I wanted to implement a method with overloads to either accept an instance of a class, or its PK value (which is either an int or GUID but does vary).

我添加类似于这些例子方法：

I added to methods similar to these examples:

    void DoSomething<TKey>(TKey key) where TKey: struct;
    void DoSomething<TModel>(TModel model) where TModel : class;

在这第二个的DoSomething的方法名被突出显示，且误差

The 'DoSomething' method name on the second of these is highlighted, and the error is

键入ISomeStuff'已经定义了一个名为DoSomething的与
相同的参数类型的成员。

Type 'ISomeStuff' already defines a member called 'DoSomething' with the same parameter types.

我对这个感到惊讶，因为我已经明确的参数定义为不同的类型：一种是类，另一个是结构。

I'm surprised by this as I've clearly defined by parameters to be of different type: one is a class and the other a struct.

为什么不这样不足以使签名不同？

Why isn't this sufficient to make the signatures different?

推荐答案

乔恩斯基特有一个一切问题的答案：的点击我

Jon Skeet has an answer to everything: click me

报价：

的声明只是不同在一般的约束和限制
不签名

the declarations only differ in generic constraints, and constraints aren't part of the signature

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