Moq + 单元测试 - System.Reflection.TargetParameterCountException:参数计数不匹配 [英] Moq + Unit Testing - System.Reflection.TargetParameterCountException: Parameter count mismatch

问题描述

我正在尝试使用带有多参数函数的 lambda，但是当我尝试调用 mock.Object.Convert(value, null, null, null); 时，Moq 在运行时抛出此异常；行.

I'm tring to use a lambda with a multiple-params function but Moq throws this exception at runtime when I attempt to call the mock.Object.Convert(value, null, null, null); line.

System.Reflection.TargetParameterCountException: Parameter count mismatch

代码是:

var mock = new Mock<IValueConverter>();

mock.Setup(conv => conv.Convert(It.IsAny<Object>(), It.IsAny<Type>(),
    It.IsAny<Object>(), It.IsAny<CultureInfo>())).Returns((Int32 num) => num + 5);

var value = 5;
var expected = 10;
var actual = mock.Object.Convert(value, null, null, null);

实现它的正确方法是什么?

What is the proper way to implement it?

推荐答案

这是您的 Returns 子句.您正在设置一个 4 参数方法，但您只使用了 1 参数 lambda.我运行以下没有问题:

It's your Returns clause. You have a 4 parameter method that you're setting up, but you're only using a 1 parameter lambda. I ran the following without issue:

[TestMethod]
public void IValueConverter()
{
    var myStub = new Mock<IValueConverter>();
    myStub.Setup(conv => conv.Convert(It.IsAny<object>(), It.IsAny<Type>(), It.IsAny<object>(), It.IsAny<CultureInfo>())).
        Returns((object one, Type two, object three, CultureInfo four) => (int)one + 5);

    var value = 5;
    var expected = 10;

    var actual = myStub.Object.Convert(value, null, null, null);

    Assert.AreEqual<int>(expected, (int) actual);
}

无异常，测试通过.

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