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.