编码的UI控件存在。 System.NullReferenceException [英] Coded UI Control.Exists. System.NullReferenceException
问题描述
我想检查一些操作后该窗口是否存在。
我尝试:
I want to check that window exists after some actions. I try:
protected override Boolean IsPresent()
{
if (_mainWindow == null)
{
_mainWindow = new WinWindow();
_mainWindow.SearchProperties[WinWindow.PropertyNames.ControlName] = "MainWindow";
}
return _mainWindow.Exists;
}
但是如果控件不存在 mainWindow.Exists
抛出System.NullReferenceException。我不明白为什么会这样,因为此代码中的mainWindow引用不能为null。
如何验证_mainWindow是否成立?
But if control does not exist mainWindow.Exists
throws System.NullReferenceException. I can't understand why it happens because mainWindow reference in this code can't be null.
How can I verify is _mainWindow founded or not?
我已经完成了等待窗口加载并超时的操作。我也尝试使用 MainWindow.FindMainWindow()。WaitForControlExist(100000)
,但它没有等待所需的超时。
此代码也未设置我所需的时间:
I've did it to wait for window loading with timeout. I've also tried to use MainWindow.FindMainWindow().WaitForControlExist(100000)
but it doesn’t wait needed timeout.
This code also not set my needed timout:
Playback.PlaybackSettings.SearchTimeout = 100000;
Playback.PlaybackSettings.WaitForReadyTimeout = 100000;
我使用VS2013。
UPD:
这是我的NRE检查代码:
This is my code with NRE check:
protected override Boolean IsPresent()
{
if (_mainWindow == null)
{
_mainWindow = new WinWindow();
_mainWindow.SearchProperties[WinWindow.PropertyNames.ControlName] = "MainWindow";
}
try
{
return _mainWindow.TryFind(); //TODO WTF?
}
catch (NullReferenceException e)
{
Console.WriteLine("We've got a NullReferenceException");
Console.WriteLine("_mainWindow reference is " + ((_mainWindow == null) ? "NULL" : "NOT NULL"));
throw e; //Line 41
}
}
这是结果:
We've got a NullReferenceException
_mainWindow reference is NOT NULL
Attachments:
file:///Project/TestResults/User_WIN-FP7FMM7PUB1%202017-04-09%2015_57_34/In/4acd6ac8-92ce-4746-8787-3aecfd63bdd8/WIN-FP7FMM7PUB1/SuccessLoginTest.png
Test method UITest.AutoTests.LoginTests.SuccessLoginTest threw exception:
System.NullReferenceException: object reference not set to an instance of an object.
in UITest.Locators.MainWindow.IsPresent() in MainWindow.cs: line 41
in UITest.Locators.BaseWindow.Wait() in BaseWindow.cs: line 34
in UITest.Locators.MainWindow..ctor() in MainWindow.cs: line 18
in UITest.Locators.LoginWindow.ClickEnterButton() in LoginWindow.cs: line 57
in UITest.AutoTests.LoginTests.SuccessLoginTest() in LoginTests.cs: line 32
推荐答案
问题出在版本中VS2013。
我已经安装了Update 5,如果没有找到对象,则TryFind()返回False。
The problem was in version of VS2013. I have installed Update 5 and now TryFind() returns False if object not found.
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