mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/RetriableClipboard.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation
   6 {
   7     using System.Threading;
   8     using System.Windows;
   9     using System.Windows.Media.Imaging;
  10     using System.Runtime.InteropServices;
  11     using System.Runtime;
  12     using System.Diagnostics;
  13
  14     // The clipboard may be accessed by other processes.
  15     // RetriableClipboard retries several times before giving up.
  16     static class RetriableClipboard
  17     {
  18         const int retryCount = 10;
  19         const int sleepTime = 50;
  20
  21         internal static IDataObject GetDataObject()
  22         {
  23             for (int i = 0; i < retryCount; i++)
  24             {
  25                 try
  26                 {
  27                     return Clipboard.GetDataObject();
  28                 }
  29                 catch (Exception err)
  30                 {
  31                     Trace.WriteLine(err.ToString());
  32                     if (Fx.IsFatal(err))
  33                     {
  34                         throw;
  35                     }
  36                     Thread.Sleep(sleepTime);
  37                 }
  38             }
  39             return null;
  40         }
  41
  42         internal static void SetDataObject(object data, bool copy)
  43         {
  44             for (int i = 0; i < retryCount; i++)
  45             {
  46                 try
  47                 {
  48                     Clipboard.SetDataObject(data, copy);
  49                     return;
  50                 }
  51                 catch (Exception err)
  52                 {
  53                     Trace.WriteLine(err.ToString());
  54                     if (Fx.IsFatal(err))
  55                     {
  56                         throw;
  57                     }
  58                     Thread.Sleep(sleepTime);
  59                 }
  60             }
  61         }
  62
  63         internal static void SetImage(BitmapSource image)
  64         {
  65             for (int i = 0; i < retryCount; i++)
  66             {
  67                 try
  68                 {
  69                     Clipboard.SetImage(image);
  70                     return;
  71                 }
  72                 catch (Exception err)
  73                 {
  74                     Trace.WriteLine(err.ToString());
  75                     if (Fx.IsFatal(err))
  76                     {
  77                         throw;
  78                     }
  79                     Thread.Sleep(sleepTime);
  80                 }
  81             }
  82         }
  83     }
  84 }