CODEWITHSUNDEEP
c#asp.net
Master Yoda
Master Yoda

Reputation: 4422

Saving an asp.net chart to file

I have a bar chart containing information on various machines relating to company.

Basically i want to output this chart to png file but i cant seem to get it output properly.

Ive been searching Google for hours trying to find a good tutorial but most of them use weird third party components to download the image and i really dont wanna do that.

this is my code at the moment:

string tmpChartName = "/MachinesByCompanyChart.png";

  protected void GenerateBarChartBut_click(object sender, EventArgs e)
        {
            Chart1.Visible = false;
            Chart2.Visible = true;

            DataTable table = new DataTable();

            dal.getTotalAssetsByCompany("table", TAB1CompanyDDL.SelectedItem.Text);

            table = dal.Results.Tables["table"];

            DataView dv = table.DefaultView;

            Chart2.Series["Series1"].Points.DataBindXY(dv, "AssetType", dv, "Total");

            Chart2.Palette = ChartColorPalette.None;

            Chart2.PaletteCustomColors = myGreenColorPalette;


            string imgPath2 = Server.MapPath(tmpChartName);
            Chart2.SaveImage(imgPath2, ChartImageFormat.Png);
        }

        protected void ExportAssetsByCompanyBut_click(object sender, EventArgs e)
        {

            Response.Clear();
            Response.ContentType = Chart1.ImageType.ToString();
            Response.AddHeader("Content-Disposition", "attachment; filename=" + tmpChartName);
            StringWriter stringWrite = new StringWriter();
            HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
            string headerTable = @"";
            Response.Write(headerTable);
            Response.Write(stringWrite.ToString());
            Response.End(); 
        }

Am i passing the saved image to the writer method properly?

Upvotes: 1

Views: 3633

Answers (1)

Manish Sharma
Manish Sharma

Reputation: 2426

try this,

set this two properties of your chart in aspx.page

EnableViewState="true"
ImageStorageMode="UseImageLocation"

write your code on aspx.cs page

System.IO.MemoryStream imagestream = new System.IO.MemoryStream();
Chart1.SaveImage(imagestream, System.Web.UI.DataVisualization.Charting.ChartImageFormat.Png);
byte[] imageByte = imagestream.ToArray();

Upvotes: 4

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