无法在CodedUI测试中识别WinEdit控件

我试图在VS 2013中手工编写一个简单的CodedUI测试。我有一个简单的windows窗体应用程序与三个文本框(txtA, txtB和txtC)和一个按钮(btnAdd)的形式。点击按钮后，应用程序会将在txtA和txtB中输入的数字相加，并在txtC中显示结果，如下图:

        var a = Convert.ToInt32(txtA.Text);
        var b = Convert.ToInt32(txtB.Text);
        txtC.Text = (a + b).ToString();

我编写的UI测试如下:

[TestMethod]
    public void CodedUITestMethod1()
    {
        ApplicationUnderTest app = ApplicationUnderTest.Launch(@"C:'Users'Dileep'Documents'Visual Studio 2013'Projects'CodedUIDemo'SimpleCalculator'bin'Debug'SimpleCalculator.exe");
        WinEdit txtA = new WinEdit(app);
        WinEdit txtB = new WinEdit(app);
        WinEdit txtC = new WinEdit(app);
        WinButton btnAdd = new WinButton(app);
        txtA.SearchProperties.Add(WinEdit.PropertyNames.Name, "txtA");
        txtB.SearchProperties.Add(WinEdit.PropertyNames.Name, "txtB");
        txtC.SearchProperties.Add(WinEdit.PropertyNames.Name, "txtC");
        btnAdd.SearchProperties.Add(WinButton.PropertyNames.Name, "btnAdd");
        txtA.Text = "50";
        txtB.Text = "50";
        Mouse.Click(btnAdd);
        var result = txtC.GetProperty("Text").ToString();
        Assert.AreEqual("100", result);
    }

当我运行测试时，它启动应用程序，等待一段时间，然后失败，出现以下错误:

Result Message:

测试方法SemiAuto.CodedUITest1。CodedUITestMethod1抛出异常:uitestcontrolnotfoundexception:播放无法找到具有给定搜索属性的控件。额外的细节:TechnologyName:"MSAA"ControlType:"编辑"名称:"txtA"System.Runtime.InteropServices.COMException: Error HRESULT E_FAIL已经从调用COM组件返回。结果加:
在Microsoft.VisualStudio.TestTools.UITest.Playback.Engine.IScreenElement。FindAllDescendants(String bstrQueryId, Object&pvarResKeys, Int32 cResKeys, Int32 nMaxDepth)在Microsoft.VisualStudio.TestTools.UITest.Playback.ScreenElement。FindAllScreenElement(String queryId, Int32 depth, Boolean singleQueryId, Boolean throwException, Boolean resetSkipStep)在Microsoft.VisualStudio.TestTools.UITest.Playback.ScreenElement。FindScreenElement(字符串queryId, Int32深度，布尔值resetSkipStep)在Microsoft.VisualStudio.TestTools.UITesting.UITestControl。FindFirstDescendant(String queryId, Int32 maxDepth, Int32&timeLeft)——内部异常堆栈跟踪结束——在Microsoft.VisualStudio.TestTools.UITesting.Playback。MapControlNotFoundException(COMException ex, IPlaybackContext context)在Microsoft.VisualStudio.TestTools.UITesting.Playback。MapAndThrowComException(COMException innerException, IPlaybackContext)在Microsoft.VisualStudio.TestTools.UITesting.Playback。MapAndThrowException(异常异常，IPlaybackContext)在Microsoft.VisualStudio.TestTools.UITesting.Playback。MapAndThrowException(异常异常，字符串queryId)在Microsoft.VisualStudio.TestTools.UITesting.UITestControl。FindFirstDescendant(String queryId, Int32 maxDepth, Int32&timeLeft)在Microsoft.VisualStudio.TestTools.UITesting.SearchHelper。getelelement(布尔值，useCache, isearchardment)在Microsoft.VisualStudio.TestTools.UITesting.SearchHelper。搜索(ISearchArgument searchArg)在Microsoft.VisualStudio.TestTools.UITesting.UITestControl.FindInternal ()在Microsoft.VisualStudio.TestTools.UITesting.UITestControl.FindControlIfNecessary ()在Microsoft.VisualStudio.TestTools.UITesting.UITestControl。SetPropertyPrivate(String propertyName, Object value)在Microsoft.VisualStudio.TestTools.UITesting.UITestControl灵活;> c__DisplayClass3e.b__3d ()在Microsoft.VisualStudio.TestTools.UITesting.CodedUITestMethodInvoker。调用方法[T](Func ' 1函数，UITestControl控件，Boolean fireplaybackerrovent, Boolean logAsAction)在Microsoft.VisualStudio.TestTools.UITesting.UITestControl。SetProperty(字符串属性名称，对象值)在Microsoft.VisualStudio.TestTools.UITesting.WinControls.WinEdit。set_Text(字符串值)c:'Users'Dileep'Documents'Visual Studio 2013'Projects'CodedUIDemo'SemiAuto'CodedUITest1.cs:line 41

我尝试使用SetProperty方法，但这也不起作用。

如果我运行记录器并生成代码，它将控件封装在WinWindow控件中。例如，txtA TextBox控件在UIMap类中这样包装:

 public class UITxtAWindow : WinWindow
{
    public UITxtAWindow(UITestControl searchLimitContainer) : 
            base(searchLimitContainer)
    {
        this.SearchProperties[WinWindow.PropertyNames.ControlName] = "txtA";
        this.WindowTitles.Add("Form1");
    }
    public WinEdit UITxtAEdit
    {
        get
        {
            if ((this.mUITxtAEdit == null))
            {
                this.mUITxtAEdit = new WinEdit(this);
                this.mUITxtAEdit.WindowTitles.Add("Form1");
            }
            return this.mUITxtAEdit;
        }
    }
    private WinEdit mUITxtAEdit;
}

我不明白为什么要这样做。有人能解释一下吗?

谢谢Dileep Krishnan

control.SearchProperties.Add(WinEdit.PropertyNames.Name, "inpt1");

[TestMethod]
public void CodedUITestMethod1()
{
    ApplicationUnderTest app = ApplicationUnderTest.Launch(@"C:'Users'Dileep'Documents'Visual Studio 2013'Projects'CodedUIDemo'SimpleCalculator'bin'Debug'SimpleCalculator.exe");
    WinEdit txtA = new WinEdit(app);
    WinEdit txtB = new WinEdit(app);
    WinEdit txtC = new WinEdit(app);
    WinButton btnAdd = new WinButton(app);
    txtA.SearchProperties.Add(WinEdit.PropertyNames.ControlName, "txtA");
    txtB.SearchProperties.Add(WinEdit.PropertyNames.ControlName, "txtB");
    txtC.SearchProperties.Add(WinEdit.PropertyNames.ControlName, "txtC");
    btnAdd.SearchProperties.Add(WinButton.PropertyNames.Name, "btnAdd");
    txtA.Text = "50";
    txtB.Text = "50";
    Mouse.Click(btnAdd);
    var result = txtC.GetProperty("Text").ToString();
    Assert.AreEqual("100", result);
}