c# - 无法将带 [] 的索引应用于类型 'CaSTLe.Proxies.RangeProxy' 的表达式

Question

是什么导致了这个异常？我正在尝试使用 Moq 来模拟 Microsoft.Office.Interop.Excel.Range。我想在其中嵌套另一个模拟的 Range 。但是当我尝试访问嵌套异常时，抛出了异常。

异常

Cannot apply indexing with [] to an expression of type 'Castle.Proxies.RangeProxy'

代码

[TestMethod]
public void RangeProxyIndexTest()
{
    // creating first range
    var cell1 = new Moq.Mock<Range>();
    cell1.Setup(c => c.Value2).Returns("1");

    var range1Mock = new Moq.Mock<Range>();
    range1Mock.SetupGet(r => r[1, Moq.It.IsAny<Object>()]).Returns(cell1.Object);
    var range1 = range1Mock.Object;

    // creating second range
    var cell2 = new Moq.Mock<Range>();
    cell2.Setup(c => c.Value2).Returns("2");

    var range2Mock = new Moq.Mock<Range>();
    range2Mock.SetupGet(r => r[1, Moq.It.IsAny<Object>()]).Returns(cell2.Object);
    var range2 = range2Mock.Object;

    // merging both ranges into 1
    var range3Mock = new Moq.Mock<Range>();
    range3Mock.SetupGet(r => r[1, Moq.It.IsAny<Object>()]).Returns(range1);
    range3Mock.SetupGet(r => r[2, Moq.It.IsAny<Object>()]).Returns(range2);
    var range3 = range3Mock.Object;

    // testing succeeds
    Assert.AreEqual("1", range1[1].Value2);
    Assert.AreSame(range1, range3[1]);
    Assert.AreEqual("2", range2[1].Value2);
    Assert.AreSame(range2, range3[2]);

    // exceptions are thrown here
    Assert.AreEqual("1", range3[1][1].Value2);
    Assert.AreEqual("2", range3[2][1].Value2);
}

Answer 1

虽然情况不一样，但是这个异常的原因和other question you have opened.是完全一样的

将您的验证部分更改为:

Assert.AreEqual("1", (range3[1] as Range)[1].Value2);
Assert.AreEqual("2", (range3[2] as Range)[1].Value2);

有关更多信息，请阅读 this answer.