参数无效C＃

Question

I am loading image in my Active Report. I went through many issues and at last I found this solution. But when I tried to run the code I am getting "Parameter not valid" exception.

Code:

  try
     {

 if (File.Exists(this.txtProtoImage.Value.ToString()))
            {
                this.imgProtoImage.Image = CreateIndexedImage(this.txtProtoImage.Value.ToString());
              //  this.imgProtoImage.Image = System.Drawing.Image.FromFile(this.txtProtoImage.Value.ToString());
                this.imgProtoImage.SizeMode = GrapeCity.ActiveReports.SectionReportModel.SizeModes.Zoom;
            }

        }
        catch (Exception ex)
        {
            throw ; // Line 119
        }
        finally
        {
            GC.Collect();
        }

[DllImport("Kernel32.dll", EntryPoint = "CopyMemory")] 
private extern static void CopyMemory(IntPtr dest, IntPtr src, uint length); 

public static Image CreateIndexedImage(string path) { 


using (var sourceImage = (Bitmap)Image.FromFile(path)) { 
    var targetImage = new Bitmap(sourceImage.Width, sourceImage.Height, 
      sourceImage.PixelFormat); 
    var sourceData = sourceImage.LockBits(
      new Rectangle(0, 0, sourceImage.Width, sourceImage.Height), 
      ImageLockMode.ReadOnly, sourceImage.PixelFormat); 
    var targetData = targetImage.LockBits(
      new Rectangle(0, 0, sourceImage.Width, sourceImage.Height), 
      ImageLockMode.WriteOnly, targetImage.PixelFormat); 
    CopyMemory(targetData.Scan0, sourceData.Scan0, 
      (uint)sourceData.Stride * (uint)sourceData.Height); 
    sourceImage.UnlockBits(sourceData); 
    targetImage.UnlockBits(targetData); 
    targetImage.Palette = sourceImage.Palette; ///Exception here
    return targetImage; 
  } 
} 

Exception:

 System.ArgumentException was unhandled
      HResult=-2147024809
      Message=Parameter is not valid.
      Source=Series.Presentation
      StackTrace:
   at Series.Presentation.Reports.RevReport.Ma_Format(Object sender, EventArgs e) in e:\UserNew\NewApp\Presentation\Reports\RevReport.cs:line 119
   at GrapeCity.ActiveReports.SectionReportModel.Section.#7Ab()
   at GrapeCity.ActiveReports.SectionReportModel.Section.#HBb(SectionReport report, PointF location)
   at #sxA.#vqb.#dzb(Section section)
   at #sxA.#vqb.#vEb()
   at #sxA.#vqb.#bZA(Page newPage, Single left, Single top, Single right, Single bottom, UInt32 flags, UInt32& status)
   at GrapeCity.ActiveReports.SectionReport.#4yb()
   at GrapeCity.ActiveReports.SectionReport.Run(Boolean syncDocument)
   at GrapeCity.ActiveReports.SectionReport.Run()
   at Series.Presentation.View.RevReportViewerWindow.OpenRevReport() in e:\UserNew\NewApp\Presentation\View\RevReportViewerWindow.xaml.cs:line 164
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()
      InnerException: 

RevReportViewerWindow.xaml.cs:

 public void OpenRevReport()
        {
 Reports.RevReport MaReport = null;
            try
            {
                MaReport = new Reports.RevReport(lstUsers, blnFlag);

                MaReport.Run();

                App.Current.Dispatcher.Invoke(() =>
                {
                    ReportViewer.Document = MaReport.Document;

                    RevHost.Child = ReportViewer;
                    ReportViewer.ViewType = GrapeCity.Viewer.Common.Model.ViewType.Continuous;
                    ReportViewer.Visible = true;

                    IsBusy = false;
                    BusyContent = "Ready.";
                });

            }
            catch (Exception ex)
            {

                throw ex;  //164th line where the exception is thrown.
            }
            finally
            {
                GC.Collect();
            }

The actual image is a smaller one and I need to show in a full size view.

Kindly help.

Answer 1

I think you could simplify your CreateIndexedImage method:

public static Image CreateIndexedImage(string path) 
{ 
    return Image.FromFile(path);
}

If you need to create a copy of your image object, you might want to use Image.Clone :

public static Image CreateIndexedImage(string path) 
{ 
    using (var sourceImage = (Bitmap)Image.FromFile(path)) 
    { 
        var targetImage = sourceImage.Clone; 

        // manipulate image 
        ...

        return targetImage;
    } 
}