James

James

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ClipBoard.SetImage (passing bmp of Control rect) causes other controls to disappear

Dec 8 2010 11:24 AM
I've created a method, both capture controls and put them into the ClipBoard as BMP images. The problem is that when you call it from, say, a UserControl with some buttons in it, and, say, a Chart control of some type, it captures the Chart Control just fine, but the buttons in the UserControl disappear. Very odd.

Any ideas?

 using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace ClipTest
{
///<summary>
/// Provides methods to copy a Control or UserControl to the Windows clipboard as a BMP
///</summary>
public class CopyToClipBoard
{
private string _ErrorMessage = string.Empty;

/// <summary>
/// Public property, which stores any Exception message encountered during capture
/// </summary>
/// <remarks>
/// If CopyControlToClipboard returns false, check this property
/// </remarks>
public string ErrorMessage
{
get { return _ErrorMessage; }
set { ErrorMessage = _ErrorMessage; }
}

/// <summary>
/// Allows copying of a Control's screen area to the clipboard as a BMP
/// </summary>
/// <param name="ControlToCapture">
/// A Control, which is captured to the clipboard entirely
/// </param>
/// <example>
/// Calling this method to capture a Control
/// <code>
///
/// CopyToClipBoard ctc = new CopyToClipBoard();
/// bool bCopied;
/// bCopied = ctc.CopyControlToClipboard(ControlName);
///
/// </code>
/// </example>
/// <permission cref="System.Security.PermissionSet">
/// Everyone can access this method.
/// </permission>
public bool CopyControlToClipboard(Control ControlToCapture)
{
try
{
// Get dimensions of the Control we are to capture
Size renderSize = ControlToCapture.RenderSize;
// Create a RenderTargetBitmap of the same dimensions to store the capture
RenderTargetBitmap rtb = new RenderTargetBitmap((int)renderSize.Width, (int)renderSize.Height, 96, 96, PixelFormats.Pbgra32);

// Render a white background in Clipboard
Rectangle vRect = new Rectangle()
{
Width = ControlToCapture.RenderSize.Width,
Height = ControlToCapture.RenderSize.Height,
Fill = Brushes.White
};
vRect.Measure(renderSize);
vRect.Arrange(new Rect(renderSize));
rtb.Render(vRect);

// Grab the Control area to a RenderTargetBitmap
ControlToCapture.Measure(renderSize);
ControlToCapture.Arrange(new Rect(renderSize));
rtb.Render(ControlToCapture);

// And finally, put it in the Clipboard
Clipboard.SetImage(rtb);
return true;
}
catch (Exception ex)
{
// Set the ErrorMessage property for caller to check after false return
_ErrorMessage = ex.ToString();
return false;
}
}

/// <summary>
/// Allows copying of a UserControl's screen area to the clipboard as a BMP
/// </summary>
/// <param name="UserControlToCapture">
/// A UserControl, which is captured to the clipboard entirely
/// </param>
/// <example>
/// Calling this method from within the UserControl to capture
/// <code>
///
/// CopyToClipBoard ctc = new CopyToClipBoard();
/// bool bCopied;
/// bCopied = ctc.CopyControlToClipboard(this);
///
/// </code>
/// </example>
/// <permission cref="System.Security.PermissionSet">
/// Everyone can access this method.
/// </permission>
public bool CopyControlToClipboard(UserControl UserControlToCapture)
{
try
{
// Get dimensions of the Control we are to capture
Size renderSize = UserControlToCapture.RenderSize;
// Create a RenderTargetBitmap of the same dimensions to store the capture
RenderTargetBitmap rtb = new RenderTargetBitmap((int)renderSize.Width, (int)renderSize.Height, 96, 96, PixelFormats.Pbgra32);

// Render a white background in Clipboard
Rectangle vRect = new Rectangle()
{
Width = UserControlToCapture.RenderSize.Width,
Height = UserControlToCapture.RenderSize.Height,
Fill = Brushes.White
};
vRect.Measure(renderSize);
vRect.Arrange(new Rect(renderSize));
rtb.Render(vRect);

// Grab the Control area to a RenderTargetBitmap
UserControlToCapture.Measure(renderSize);
UserControlToCapture.Arrange(new Rect(renderSize));
rtb.Render(UserControlToCapture);

// And finally, put it in the Clipboard
Clipboard.SetImage(rtb);
return true;
}
catch (Exception ex)
{
// Set the ErrorMessage property for caller to check after false return
_ErrorMessage = ex.ToString();
return false;
}
}
}
}