[Mono-bugs] [Bug 79580][Blo] New - NRE when pasting to TextBox

bugzilla-daemon at bugzilla.ximian.com bugzilla-daemon at bugzilla.ximian.com
Wed Oct 4 11:31:47 EDT 2006

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Changed by monkey at jpobst.com.


--- shadow/79580	2006-10-04 11:31:47.000000000 -0400
+++ shadow/79580.tmp.11815	2006-10-04 11:31:47.000000000 -0400
@@ -0,0 +1,72 @@
+Bug#: 79580
+Product: Mono: Class Libraries
+Version: 1.1
+OS Details: 
+Status: NEW   
+Priority: Blocker
+Component: Windows.Forms
+AssignedTo: toshok at ximian.com                            
+ReportedBy: monkey at jpobst.com               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+Summary: NRE when pasting to TextBox
+Description of Problem:
+Take a multiline textbox that is empty, and paste in enough text that will
+cause word wrap and that has spaces in it.  The app will crash with the NRE:
+Unhandled Exception: System.NullReferenceException: Object reference not
+set to an instance of an object
+  at System.Windows.Forms.Document.Insert (System.Windows.Forms.Line line,
+System.Windows.Forms.LineTag tag, Int32 pos, Boolean update_caret,
+System.String s) [0x00000] 
+  at System.Windows.Forms.Document.ReplaceSelection (System.String s)
+  at System.Windows.Forms.TextBoxBase.set_SelectedText (System.String
+value) [0x00000] 
+  at System.Windows.Forms.TextBoxBase.Paste (IDataObject clip,
+System.Windows.Forms.Format format, Boolean obey_length) [0x00000] 
+  at System.Windows.Forms.TextBoxBase.ProcessKey (Keys keyData) [0x00000] 
+  at System.Windows.Forms.TextBoxBase.WndProc (System.Windows.Forms.Message
+m) [0x00000] 
+  at System.Windows.Forms.TextBox.WndProc (System.Windows.Forms.Message m)
+  at System.Windows.Forms.Control+ControlNativeWindow.WndProc
+(System.Windows.Forms.Message m) [0x00000] 
+  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg,
+IntPtr wParam, IntPtr lParam) [0x00000] 
+  at (wrapper native-to-managed) System.Windows.Forms.NativeWindow:WndProc
+  at <0x00000> <unknown method>
+  at (wrapper managed-to-native)
+  at System.Windows.Forms.XplatUIWin32.DispatchMessage
+(System.Windows.Forms.MSG msg) [0x00000] 
+  at System.Windows.Forms.XplatUI.DispatchMessage (System.Windows.Forms.MSG
+msg) [0x00000] 
+  at System.Windows.Forms.Application.RunLoop (Boolean Modal,
+System.Windows.Forms.ApplicationContext context) [0x00000] 
+  at System.Windows.Forms.Application.Run (System.Windows.Forms.Form
+mainForm) [0x00000] 
+  at TextBoxScroll.MainForm.Main (System.String[] args) [0x00000] 
+Steps to reproduce the problem:
+1. Compile attached sample.
+2. "Paste this text right here twice into the textbox to make it crash!"
+Actual Results:
+App crashes with above NRE.
+Expected Results:
+Paste works without crashing.
+How often does this happen? 
+Additional Information:

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