c# - 打开文件对话框错误？

Question

这是我点击保存按钮时的代码:

OpenFileDialog myOpenfileDialog = new OpenFileDialog(); 
        myOpenfileDialog.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";
        myOpenfileDialog.FilterIndex = 2;
        myOpenfileDialog.RestoreDirectory = true;

        if (myOpenfileDialog.ShowDialog() == DialogResult.OK)
        {
            FileUploadData.SaveAs(myOpenfileDialog.FileName);//my file upload control taking the path to save the file to the selected location
        }   

我遇到了这个异常:

Current thread must be set to single thread apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process. this is a threadStateException

Answer 1

好吧，这个消息对我来说似乎相当清楚——您需要使用 STA 线程。如果您正在编写一个 Windows 窗体应用程序，您可以通过确保您的 Main 方法装饰有如下属性来实现此目的:

[STAThread]
static void Main(string[] args)
{
    ...
}

如果您正在编写一个 ASP.NET 应用程序，您不应该首先尝试在您的代码中使用 Windows 窗体控件。我提到这个是因为你用 both winforms 和 asp.net 标记了你的问题 - 你不应该混合这两者的代码.