Net 8 MultiDocument ADD mtehod Fails because of LinearGradientBrush

Net 8 MultiDocument ADD mtehod Fails because of LinearGradientBrush

Posted by: hrvoje.zirdum on 6 December 2024, 11:52 am EST

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  hrvoje.zirdum

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  Posted 6 December 2024, 11:52 am EST - Updated 6 December 2024, 12:01 pm EST

  Hi,
  
  I have a WinForms 4.8 desktop application. When I migrated it to Net 8, I’ got an error in MultiDocument.Add function when I create a PrintDocument object with RenderTextObject using LinearGradientBrush as a brush.

  I have changed a little example code from your pages (https://developer.mescius.com/componentone/docs/win/online-printdocument/multi-document.html) so you can reproduce the error on your side (marked it with “// added - Begin” and // added - End")

  C1PrintPreviewControl ppc = new C1PrintPreviewControl();
  Controls.Add(ppc);
  ppc.Dock = DockStyle.Fill;
  C1PrintDocument pdoc = new C1PrintDocument(); 
  C1PrintDocument pdoc2 = new C1PrintDocument(); 
  C1MultiDocument mdoc = new C1MultiDocument();
  pdoc.Body.Children.Add(new C1.C1Preview.RenderText("Hello!"));
  pdoc2.Body.Children.Add(new C1.C1Preview.RenderText("World!"));
  
  // added - Begin
   RenderText rTex = new RenderText();
   LinearGradientBrush brusBackground = new LinearGradientBrush(new Rectangle(0, 0, 1, 1), Color.White, Color.FromArgb(255, 255, 153), LinearGradientMode.Vertical);
   rTex.Style.Brush = brusBackground;
   rTex.Text = "Tekst with LinearGradientBrush";
   pdoc.Body.Children.Add(rTex);
  // added - End
       
  mdoc.Items.Add(pdoc);
  mdoc.Items.Add(pdoc2); 
  ppc.Document = mdoc;
  mdoc.Generate();

  When I run the code above in the .NET 8 WinForms project, I’m getting this error: “System.NullReferenceException: ‘Object reference not set to an instance of an object.’”.

  This is StackTrace:
  
  " at C1.C1Preview.GraphicsUtils.d(**LinearGradientBrush **a)\r\n at fp.fk(fa a, Object b, Boolean c)\r\n at fc.gg(Object a, ey b, Boolean c, Boolean d, Boolean e)\r\n at fc.gg(Object a, Boolean b, Boolean c)\r\n at fa.bq(Object a, Boolean b, Boolean c)\r\n at fa.au(Int32 a, Object b, Boolean c, Boolean d)\r\n at C1.C1Preview.Style.a.NS_Serialize(fa a)\r\n at C1.C1Preview.PropsHashtable`1.C1.C1Preview.NativeSerialization.IC1NativeSerializable.Serialize(fa a)\r\n at fc.gg(IC1NativeSerializable a, Boolean b, Boolean c)\r\n at fa.am(Int32 a, IC1NativeSerializable b, Boolean c, Boolean d)\r\n at C1.C1Preview.Style.NS_Serialize(fa a)\r\n "

  Can you help me?

  Regards,
  
  Hrvoje

  

  1093×380 75.3 KB

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  uttkarsh.matiyal

  

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  Posted 9 December 2024, 6:27 am EST

  Hello Hrvoje,

  Thank you for sharing the details. We’re also able to observe the behavior on our end.
  
  We have escalated it to the development team for further investigation. Rest assured, we’ll get back to you once we have more information. [Internal tracking ID: C1WIN-33432]

  Regards,
  
  Uttkarsh.

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  uttkarsh.matiyal

  

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  Posted 13 May 2026, 6:53 am EST

  Hello Hrvoje,

  The issue has been resolved in the latest version of the controls. Please upgrade to the latest major version, v740 or later, to resolve the issue on your end.

  Please refer to a sample using v761: PrintDoc_Sample_Updated.zip

  Regards,
  
  Uttkarsh.

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  hrvoje.zirdum

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  Posted 14 May 2026, 1:54 am EST - Updated 14 May 2026, 2:13 am EST

  Hello

  It works fine with version 740, but with version 761 it throws error:
  
  "
  
  System.Exception: ‘Exception occurred during document generation:
  
  Index was outside the bounds of the array.’

  Inner exception
  
  IndexOutOfRangeException: Index was outside the bounds of the array.

  This exception was originally thrown at this call stack:
  
  [External Code]
  
  "
  
  Image of error is attached.
  
  

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  uttkarsh.matiyal

  

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  Posted 14 May 2026, 5:57 am EST

  Hello,

  Apologies for the oversight.
  
  We have escalated the behavior to the development team for further insights. [Internal Tracking ID: C1WIN-35294]
  
  We’ll get back once we have more information.

  Regards,
  
  Uttkarsh.

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  uttkarsh.matiyal

  

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  Posted 3 June 2026, 6:01 am EST

  Hello,

  The issue has been fixed in the latest release of C1.Win.Printing—10.0.20261.779.
  
  Please upgrade the C1 NuGet Packages and let us know your observations.

  Regards,
  
  Uttkarsh.

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  hrvoje.zirdum

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  Posted 5 June 2026, 8:06 am EST

  It is ok now. Thanks.