异常信息“OpenClipboard HRESULT:0x800401D0 (CLIPBRD_E_CANT_OPEN

WPF本身对Clipboard处理的问题，在.Net4.0及之前的版本中都有问题，在.Net4.5中修复了，但XP下安装不了.NET4.5，而我的程序又必须在XP下运行。

问题主要是由于：在程序访问剪切板的时候，有其他程序正在占用剪切板，导致自己的程序无法访问，从而抛出异常。

自行截获异常，进行处理

for (int i = 0; i < 10; i++)

{

try

{

Clipboard.SetText(lineTexts[lineIndex]);

break;

}

catch

{

System.Threading.Thread.Sleep(10);//这句加不加都没关系

}

}

这种方法处理过程中UI会有一小段时间的假死。。。可以考虑多线程？

2. 换一种方式设置剪切板

Clipboard.SetDataObject(lineTexts[lineIndex]);

就这一句。。。这种方法不会抛异常，UI也没有假死，非常正常！估计SetDataObject方法跟SetText方法的实现不一样，没有细究。。。

3. 跟方法1类似，不过有点高级

剪切板处理的那句代码不变，还是使用SetText方法。

在App.xaml文件中添加下面代码中红色的部分

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

StartupUri="MainWindow.xaml"

DispatcherUnhandledException="Application_DispatcherUnhandledException">

在App.xaml.cs文件中添加代码：

void Application_DispatcherUnhandledException(object sender, DispatcherUnhandledExceptionEventArgs e)

{

var comException = e.Exception as System.Runtime.InteropServices.COMException;

if (comException != null && comException.ErrorCode == -2147221040)///OpenClipboard HRESULT:0x800401D0 (CLIPBRD_E_CANT_OPEN))

e.Handled = true;

}

4.使用winform剪贴板

System.Windows.Forms.Clipboard.SetText(txt2.Text);

看一下WinForm和WPF的代码

WinForm的SetText()最终会调用SetDataObject(data, copy, 10, 100),这个是SetDataObject()的签名：

[UIPermission(SecurityAction.Demand, Clipboard=UIPermissionClipboard.OwnClipboard)]

public static void SetDataObject(object data, bool copy, int retryTimes, int retryDelay)

{

if (Application.OleRequired() != ApartmentState.STA)

{

throw new ThreadStateException(SR.GetString("ThreadMustBeSTA"));

}

if (data == null)

{

throw new ArgumentNullException("data");

}

if (retryTimes < 0)

{

object[] args = new object[] { "retryTimes", retryTimes.ToString(CultureInfo.CurrentCulture), 0.ToString(CultureInfo.CurrentCulture) };

throw new ArgumentOutOfRangeException("retryTimes", SR.GetString("InvalidLowBoundArgumentEx", args));

}

if (retryDelay < 0)

{

object[] objArray2 = new object[] { "retryDelay", retryDelay.ToString(CultureInfo.CurrentCulture), 0.ToString(CultureInfo.CurrentCulture) };

throw new ArgumentOutOfRangeException("retryDelay", SR.GetString("InvalidLowBoundArgumentEx", objArray2));

}

DataObject obj2 = null;

if (!(data is IDataObject))

{

obj2 = new DataObject(data);

}

bool flag = false;

try

{

IntSecurity.ClipboardRead.Demand();

}

catch (SecurityException)

{

flag = true;

}

if (flag)

{

if (obj2 == null)

{

obj2 = data as DataObject;

}

if (!IsFormatValid(obj2))

{

throw new SecurityException(SR.GetString("ClipboardSecurityException"));

}

}

if (obj2 != null)

{

obj2.RestrictedFormats = flag;

}

int num2 = retryTimes;

IntSecurity.UnmanagedCode.Assert();

try

{

int num;

do

{

if (data is IDataObject)

{

num = UnsafeNativeMethods.OleSetClipboard((IDataObject) data);

}

else

{

num = UnsafeNativeMethods.OleSetClipboard(obj2);

}

if (num != 0)

{

if (num2 == 0)

{

ThrowIfFailed(num);

}

num2--;

Thread.Sleep(retryDelay);

}

}

while (num != 0);

if (copy)

{

num2 = retryTimes;

do

{

num = UnsafeNativeMethods.OleFlushClipboard();

if (num != 0)

{

if (num2 == 0)

{

ThrowIfFailed(num);

}

num2--;

Thread.Sleep(retryDelay);

}

}

while (num != 0);

}

}

finally

{

CodeAccessPermission.RevertAssert();

}

}

而WPF的SetText()，虽然签名一样，但是具有完全不同的实现：

[SecurityCritical]

public static void SetDataObject(object data, bool copy)

{

SecurityHelper.DemandAllClipboardPermission();

CriticalSetDataObject(data, copy);

}

[FriendAccessAllowed, SecurityCritical]

internal static void CriticalSetDataObject(object data, bool copy)

{

IDataObject obj2;

if (data == null)

{

throw new ArgumentNullException("data");

}

if (data is DataObject)

{

obj2 = (DataObject) data;

}

else if (data is IDataObject)

{

SecurityHelper.DemandUnmanagedCode();

obj2 = (IDataObject) data;

}

else

{

obj2 = new DataObject(data);

}

int num2 = 10;

while (true)

{

int hr = OleServicesContext.CurrentOleServicesContext.OleSetClipboard(obj2);

if (NativeMethods.Succeeded(hr))

{

break;

}

if (--num2 == 0)

{

Marshal.ThrowExceptionForHR(hr);

}

Thread.Sleep(100);

}

if (copy)

{

Thread.Sleep(10);

Flush();

}

}