Assert.AreEqual(object, object) 方法

Question

Assert.AreEqual(object, object)方法（在命名空间Microsoft.VisualStudio.TestTools.UnitTesting中）如何判断参数是否相等？它是否使用了Object.Equals(object, object) 方法（在System 命名空间中）？

Answer 1

使用reflector 可以看到它确实使用了 Object.Equals。

public static void AreEqual<T>(T expected, T actual, string message, params object[] parameters)
{
    if (!object.Equals(expected, actual))
    {
        string str;
        if (((actual != null) && (expected != null)) && !actual.GetType().Equals(expected.GetType()))
        {
            str = (string) FrameworkMessages.AreEqualDifferentTypesFailMsg((message == null) ? string.Empty : ReplaceNulls(message), ReplaceNulls(expected), expected.GetType().FullName, ReplaceNulls(actual), actual.GetType().FullName);
        }
        else
        {
            str = (string) FrameworkMessages.AreEqualFailMsg((message == null) ? string.Empty : ReplaceNulls(message), ReplaceNulls(expected), ReplaceNulls(actual));
        }
        HandleFail("Assert.AreEqual", str, parameters);
    }
}