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Chartfx as a webservice to return images


shane2004
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I can manage to generate the jpg file by using renderStream directly on the page. 

Basically I use following codes to download the data in excel format from a dataview, any idea I can do similar thing but downloading the image?

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Response.ClearContent();

Response.AddHeader("content-disposition", "attachment; filename=" + strFileName);

Response.ContentType =

"application/excel";System.IO.StringWriter sw = new System.IO.StringWriter();

HtmlTextWriter htw = new HtmlTextWriter(sw);

//Instantiate a datagridSystem.Web.UI.WebControls.DataGrid dg = new System.Web.UI.WebControls.DataGrid();

dg.DataSource = dv;

dg.DataBind();

//Tell the datagrid to render itself to htmltextwriter

dg.RenderControl(htw);

Response.Write(sw.ToString());

Response.End();

 
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HiYou can achieve this with the following approach:

1) Get Chart stream (MyStream) using the chart export method.   MemoryStream MyStream = new MemoryStream();   MyChart.Export(FileFormat.Jpeg, MyStream);   2) Convert the stream to a base 64 string:   MyStream.Position = 0;   StreamReader reader = new StreamReader(MyStream);   string strBase64 = Convert.ToBase64String(MyStream.ToArray());3) Now you can export this base64 string as the output of your webservice endopint.

You can in your excel or any other software, get this base64 str back again into a picture file.

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