C# 返回传递给方法的值
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Returning value that was passed into a method
提问by Steve Dunn
I have a method on an interface:
我在接口上有一个方法：
string DoSomething(string whatever);
I want to mock this with MOQ, so that it returns whatever was passed in - something like:
我想用 MOQ 来模拟它，以便它返回传入的任何内容 - 类似于：
_mock.Setup( theObject => theObject.DoSomething( It.IsAny<string>( ) ) )
.Returns( [the parameter that was passed] ) ;
Any ideas?
有任何想法吗？
采纳答案by mhamrah
You can use a lambda with an input parameter, like so:
您可以使用带有输入参数的 lambda，如下所示：
.Returns((string myval) => { return myval; });
Or slightly more readable:
或者稍微更具可读性：
.Returns<string>(x => x);
回答by WDuffy
The generic Returns<T>method can handle this situation nicely.
泛型Returns<T>方法可以很好地处理这种情况。
_mock.Setup(x => x.DoSomething(It.IsAny<string>())).Returns<string>(x => x);
Or if the method requires multiple inputs, specify them like so:
或者，如果该方法需要多个输入，请像这样指定它们：
_mock.Setup(x => x.DoSomething(It.IsAny<string>(), It.IsAny<int>())).Returns((string x, int y) => x);
回答by Steve
Even more useful, if you have multiple parameters you can access any/all of them with:
更有用的是，如果您有多个参数，则可以通过以下方式访问任何/所有参数：
_mock.Setup(x => x.DoSomething(It.IsAny<string>(),It.IsAny<string>(),It.IsAny<string>())
.Returns((string a, string b, string c) => string.Concat(a,b,c));
You always need to reference all the arguments, to match the method's signature, even if you're only going to use one of them.
您始终需要引用所有参数，以匹配方法的签名，即使您只打算使用其中之一。
