Export mschart to file

Hi Experts,

I'm trying to export an mschart to a file, excel would be preferable but an image file is also ok... I found the follwing code but having problems in my web application:
protected void exportButton_Click(object sender, ImageClickEventArgs e)
        {
            Response.ContentType = "image/png";
            Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}-{1}.png"));
            Chart4.SaveImage(Response.OutputStream, ChartImageFormat.Png);         
            Response.End();
         }

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I get the error:
"Index (zero based) must be greater than or equal to zero and less than the size of the argument list."

Can anyone explain this to me and how to resolve?
madkrellAsked:
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kdwoodConnect With a Mentor Commented:
Greetings Madkrell,

A couple of questions:

1.  What version of Visual Studio and Chart Controls are you using?

2.  What happens if you strip your code down just to the following . . . does the chart save to an image?
       
       {
            Chart4.SaveImage("C:\SavedChart.png", ChartImageFormat.Png);        
            Response.End();
        }


Regards,

Keith

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rawinnlnx9Commented:
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madkrellAuthor Commented:
rawinnlnx9,

Thanks but I've already looked at this thread and it doesn't address my issue?
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madkrellAuthor Commented:
I've amended to:
Response.AddHeader("Content-Disposition", string.Format("attachment; filename=filename.png"));
            Chart4.SaveImage(Response.OutputStream, ChartImageFormat.Png);     

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but getting the error:
"A generic error occurred in GDI+"

any ideas?
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kdwoodCommented:

After looking at your code further, I think this section from your Response.AddHeader statement is your problem:

filename={0}-{1}.png"));

Try changing your code as follows:

 Response.AddHeader("Content-Disposition", "attachment; filename=test.png");

       {
            Response.ContentType = "image/png";
            Response.AddHeader("Content-Disposition", "attachment; filename=test.png");
            Chart4.SaveImage(Response.OutputStream, ChartImageFormat.Png);        
            Response.End();
         }


This should pop up a save dialog with the default filename of "test.png".   Then the user can change the filename to whatever they want.   I'm not sure if this was the approach you were looking for.  Please clarify further if I am on the wrong track.

Keith

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madkrellAuthor Commented:
Hi Keith,

Thanks for your help...  If you check my comment from 24/02/11 04:14 PM I'd already changed my code but getting the error

"A generic error occurred in GDI+" on the line:  
Chart4.SaveImage(Response.OutputStream, ChartImageFormat.Png); 

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This doesn't tell me much and I can't determine problem from stack trace either:
   at System.Drawing.Image.Save(Stream stream, ImageCodecInfo encoder, EncoderParameters encoderParams)
   at System.Drawing.Image.Save(Stream stream, ImageFormat format)
   at System.Web.UI.DataVisualization.Charting.Chart.SaveImage(Stream imageStream, ChartImageFormat format)
   at SupplierPortal.WebForm3.exportBtn_Click(Object sender, ImageClickEventArgs e) in C:\Users\Administrator\Documents\Visual Studio 2010\Projects\SupplierPortal\SupplierPortal\Advanced\Analysis.aspx.cs:line 78
   at System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e)
   at System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.WebControls.ImageButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
   at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

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Any ideas why I would be getting this error?


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madkrellAuthor Commented:
Sorry I didn't answer your 1st question.  I am using VS2010.   When I use a hard coded path instead of Response.OutputStream() it pops up the open/save file dialogue box and works fine so I assume the problem GDI+ error is related to using Response.OutputStream()?
The following works ok but I want the end user to select where they save it:
 Response.AddHeader("Content-Disposition", "attachment; filename=SupplierChart.png");
            {
            Chart4.SaveImage("C:/SupplierChart.png", ChartImageFormat.Png);        
            Response.End();
            }

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madkrellConnect With a Mentor Author Commented:
Hi Keith,

Thanks for pointing me in the right direction.  From stripping down the code and looking at using Response.OutputStream() it led me to this link:
http://www.west-wind.com/weblog/posts/6008.aspx

Looks like the issue is with Jpeg type so the work around with passing to a memorystream first works as per the code below:
 
MemoryStream MemStream = new MemoryStream();
            {
                Response.ContentType = "image/png";
                Response.AddHeader("Content-Disposition", "attachment; filename= SupplierCharts.Png");
                varChart.SaveImage(MemStream, ChartImageFormat.Png);
                MemStream.WriteTo(Response.OutputStream);
                Response.End();
            }

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kdwoodCommented:
Glad I could help Madkrell.  

Regards,

Keith
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madkrellAuthor Commented:
Thanks.
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