Wenn ich eine Bitmap an ein Property eines UserControl übergeben will kommt es zum Fehler

Hi @Klaus Ruttkowski ,

The .NET 8.0 runtime is not able to serialize the System.Drawing.Bitmap object the same way it did in .NET 4.0. In .NET Core and later versions, the System.Drawing.Common library behaves differently compared to .NET Framework, and Bitmap serialization might not be supported directly.

Instead of trying to directly pass a Bitmap object to the property, use the ImageConverter to convert the Bitmap into a format that can be serialized, such as a byte array or Base64 string.

[CategoryAttribute("RuSplash Settings")] 
[DescriptionAttribute("Company image")] 
[Browsable(true)] 
public byte[] CompanyBitmap { 
    get {
        if (_companyBitmap != null)
        {
            using (var ms = new MemoryStream())
            {
                _companyBitmap.Save(ms, ImageFormat.Png);
                return ms.ToArray();
            }
        }
        return null;
    }
    set {
        if (value != null)
        {
            using (var ms = new MemoryStream(value))
            {
                _companyBitmap = new Bitmap(ms);
            }
        }
        else
        {
            _companyBitmap = null;
        }
        pictureBoxCompany.Image = _companyBitmap;
    }
}
private Bitmap _companyBitmap;

Best Regards.

Jiachen Li

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I now have the solution, you have to use the NuGet package:

NuGet Install-Package System.Drawing.Common - Version 8.0.8

and use the image from there.

        // using System.Drawing.Common (Nuget.org)
       /*
           // 
           // pictureBoxCompanyImage
           // 
           pictureBoxCompanyImage.Image = UserControlRuSplash.Resource1.Klaus72x72;
           pictureBoxCompanyImage.Location = new Point(112, 55);
           pictureBoxCompanyImage.Name = "pictureBoxCompanyImage";
           pictureBoxCompanyImage.Size = new Size(184, 148);
           pictureBoxCompanyImage.SizeMode = PictureBoxSizeMode.StretchImage;
           pictureBoxCompanyImage.TabIndex = 0;
           pictureBoxCompanyImage.TabStop = false;
      */

       [CategoryAttribute("RuSplash Settings")]
       [DescriptionAttribute("Company CompanyImage")]
       [Browsable(true)]
       public System.Drawing.Image CompanyImage { set; get; }

       private void RuSplash_ClientSizeChanged(object sender, EventArgs e)
       {
           if (CompanyImage != null)
           {
               this.pictureBoxCompanyImage.Image = CompanyImage;
           }
       }