.net 单线程单元 - 无法实例化 ActiveX 控件
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Single-threaded apartment - cannot instantiate ActiveX control
提问by martin.malek
I need to get information about applied CSS styles in HTML page. I used AxWebBrowser and iterate IHTMLDOMNode. I'm able to get all the data I need and move the code into my application. The problem is that this part is running inside of the background worker and I got exception when trying to instantiate the control.
我需要获取有关 HTML 页面中应用的 CSS 样式的信息。我使用了 AxWebBrowser 并迭代了 IHTMLDOMNode。我能够获得我需要的所有数据并将代码移动到我的应用程序中。问题是这部分在后台工作人员内部运行，并且在尝试实例化控件时出现异常。
AxWebBrowser browser = new AxWebBrowser();
ActiveX control '8856f961-340a-11d0-a96b-00c04fd705a2' cannot be instantiated
because the current thread is not in a single-threaded apartment.
Is there any way how to solve this or other option than AxWebBrowser?
除了 AxWebBrowser 之外，有什么方法可以解决这个问题或其他选项吗？
回答by JaredPar
The problem you're running into is that most background thread / worker APIs will create the thread in a Multithreaded Apartment state. The error message indicates that the control requires the thread be a Single Threaded Apartment.
您遇到的问题是大多数后台线程/工作 API 将在多线程单元状态中创建线程。该错误消息表明该控件要求该线程是单线程单元。
You can work around this by creating a thread yourself and specifying the STA apartment state on the thread.
您可以通过自己创建一个线程并在该线程上指定 STA 单元状态来解决此问题。
var t = new Thread(MyThreadStartMethod);
t.SetApartmentState(ApartmentState.STA);
t.Start();
回答by user764177
Go ahead and add [STAThread] to the main entry of your application, this indicates the COM threading model is single-threaded apartment (STA)
继续将 [STAThread] 添加到您的应用程序的主条目，这表明 COM 线程模型是单线程单元 (STA)
example:
例子：
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new WebBrowser());
}
}
回答by Ahmad
If you used [STAThread]to the main entry of your application and still get the error you may need to make a Thread-Safe callto the control... something like below. In my case with the same problem the following solution worked!
如果您习惯[STAThread]了应用程序的主条目，但仍然收到错误消息，您可能需要对控件进行线程安全调用...如下所示。在我遇到同样问题的情况下，以下解决方案有效！
Private void YourFunc(..)
{
if (this.InvokeRequired)
{
Invoke(new MethodInvoker(delegate()
{
// Call your method YourFunc(..);
}));
}
else
{
///
}
