有没有更好的方法来测试 NullReferenceException？

Question

应用程序正在运行并且应用程序的窗口在屏幕上可见， 但是编码的 ui 测试总是得到 NullReferenceException：

• 采样 = 应用程序
• sampling.Window = 应用程序的主窗口

代码：

if(object.ReferenceEquals(sampling, null)) // sampling is not a null reference (debug output)
if(sampling == null) //  sampling is not null
if(object.ReferenceEquals(sampling.Window, null)) //  sampling.Window is not a null reference
if(sampling.Window == null) //  sampling.Window is not null
if (sampling.Window.Exists) //  sampling.Window exists? True
if(sampling.Window.TryGetClickablePoint(out pt)) //  Got clickable point? False  Point = {X=0,Y=0}

if(object.ReferenceEquals(sampling.Window.BoundingRectangle, null)) //  Exception: object reference not set to an instance of an object.
if(object.ReferenceEquals(sampling.Window.ControlType, null)) //  Exception: object reference not set to an instance of an object.
if(object.ReferenceEquals(sampling.Window.Name, null)) //  Exception: object reference not set to an instance of an object.
if(object.ReferenceEquals(sampling.Window.ClassName, null)) //  Exception: object reference not set to an instance of an object.
if(sampling.Window.BoundingRectangle == null) //   Exception: object reference not set to an instance of an object.
if(sampling.Window.ControlType == null) //   Exception: object reference not set to an instance of an object.
if(sampling.Window.Name == null) //   Exception: object reference not set to an instance of an object.
if(sampling.Window.ClassName == null) //   Exception: object reference not set to an instance of an object.

Answer 1

如果sampling.Window 本身不是 null，但像sampling.Window.Name == null 这样的东西会导致NullReferenceException，我怀疑异常来自属性@ 的get 访问器内部987654326@.

您是否在没有优化的情况下编译了它（在“调试”模式下）并尝试在附加的 Visual Studio 调试器的情况下运行它？当异常发生时它应该停止执行，并且您应该能够看到哪个引用是null。它可能位于 Visual Studio 用颜色突出显示的行的正上方。