c# - 使用 WPF 退出时出现 COM 异常

Question

执行完以下两个测试用例后，COM 执行将打印到控制台。我做错了什么？

如果我单独运行其中一个测试，或者如果我同时运行两个测试，异常只会被写入控制台一次。这让我怀疑我没有清理某种按 AppDomain 的资源。

我已尝试使用 NUnit 和 MSTest 进行测试，两种环境中的行为相同。 (实际上，我不确定在 MSTest 中运行这两个测试是否会导致一个或两个异常打印输出。)

异常(exception):

System.Runtime.InteropServices.InvalidComObjectException: COM object that has been separated from its underlying RCW cannot be used.
at System.Windows.Input.TextServicesContext.StopTransitoryExtension()
at System.Windows.Input.TextServicesContext.Uninitialize(Boolean appDomainShutdown)
at System.Windows.Input.TextServicesContext.TextServicesContextShutDownListener.OnShutDown(Object target)
at MS.Internal.ShutDownListener.HandleShutDown(Object sender, EventArgs e)

测试代码:

using NUnit.Framework;

namespace TaskdockSidebarTests.Client
{
    [TestFixture, RequiresSTA]
    public class ElementHostRCWError
    {
        [Test]
        public void WinForms()
        {
            var form = new System.Windows.Forms.Form();
            var elementHost = new System.Windows.Forms.Integration.ElementHost();
            form.Controls.Add(elementHost);

            // If the form is not shown, the exception is not printed.
            form.Show();

            // These lines are optional. The exception is printed with or without
            form.Close();
            form.Controls.Remove(elementHost);
            elementHost.Dispose();
            form.Dispose();
        }

        [Test]
        public void WPF()
        {
            var window = new Window();

            // If the window is not shown, the exception is not printed.
            window.Show();

            window.Close();
        }
    }
}

Answer 1

再次查看我自己的代码，以下行可能有助于 WPF 测试，就在最后。

Dispatcher.CurrentDispatcher.InvokeShutdown();