I wish calling SetText were that easy but there are quite a few gotchas that you have to deal with. You have to make sure that the thread you are calling it on is running in the STA. It can sometimes fail with an access denied error then work seconds later without problem - something to do with the COM timing issues in the clipboard. And if your application is accessed over Remote Desktop access to the clipboard is sketchy. We use a centralized method to handle all theses scenarios instead of calling SetText directly.

以下是我们的集中代码:

StaHelper类只是在单线程单元(STA)中的线程上执行一些任意代码——这是剪贴板所需要的。

abstract class StaHelper
{
    readonly ManualResetEvent _complete = new ManualResetEvent( false );    

    public void Go()
    {
        var thread = new Thread( new ThreadStart( DoWork ) )
        {
            IsBackground = true,
        }
        thread.SetApartmentState( ApartmentState.STA );
        thread.Start();
    }

    // Thread entry method
    private void DoWork()
    {
        try
        {
            _complete.Reset();
            Work();
        }
        catch( Exception ex )
        {
            if( DontRetryWorkOnFailed )
                throw;
            else
            {
                try
                {
                    Thread.Sleep( 1000 );
                    Work();
                }
                catch
                {
                    // ex from first exception
                    LogAndShowMessage( ex );
                }
            }
        }
        finally
        {
            _complete.Set();
        }
    }

    public bool DontRetryWorkOnFailed{ get; set; }

    // Implemented in base class to do actual work.
    protected abstract void Work();
}

然后我们有一个特定的类来设置剪贴板上的文本。在某些Windows/. net版本的某些边缘情况下，需要手动创建数据对象。我现在不记得具体的场景了，在。net 3.5中可能不需要它。

class SetClipboardHelper : StaHelper
{
    readonly string _format;
    readonly object _data;

    public SetClipboardHelper( string format, object data )
    {
        _format = format;
        _data = data;
    }

    protected override void Work()
    {
        var obj = new System.Windows.Forms.DataObject(
            _format,
            _data
        );

        Clipboard.SetDataObject( obj, true );
    }
}

用法如下:

new SetClipboardHelper( DataFormats.Text, "See, I'm on the clipboard" ).Go();

使用这个问题中显示的解决方案System.Windows.Forms.Clipboard.SetText(…)，会导致异常:

在OLE调用之前，当前线程必须设置为单线程公寓(STA)模式

为了防止这种情况，你可以添加属性:

[STAThread]

to

static void Main(string[] args)

在Windows窗体中，如果你的字符串在文本框中，你可以很容易地使用这个:

textBoxcsharp.SelectAll();
textBoxcsharp.Copy();
textBoxcsharp.DeselectAll();

你可以使用System.Windows.Forms.Clipboard.SetText(…)。

这对我来说很管用:

你想做的是:

System.Windows.Forms.Clipboard.SetText("String to be copied to Clipboard");

但是它会导致一个错误，说它必须在ApartmentState.STA的单个线程中。

让我们让它在这样一个线程中运行。它的代码:

public void somethingToRunInThread()
{
    System.Windows.Forms.Clipboard.SetText("String to be copied to Clipboard");
}

protected void copy_to_clipboard()
{
    Thread clipboardThread = new Thread(somethingToRunInThread);
    clipboardThread.SetApartmentState(ApartmentState.STA);
    clipboardThread.IsBackground = false;
    clipboardThread.Start();
}

在调用copy_to_clipboard()之后，字符串被复制到剪贴板中，因此您可以使用Paste或Ctrl + V并将字符串作为string返回，以复制到剪贴板中。

System.Windows.Forms.Clipboard.SetText (Windows窗体)或System.Windows.Clipboard.SetText (WPF)