asp.net:Invalid temp directory in chart handler configuration [c:\TempImageFiles\]

Question

I am getting this error Invalid temp directory in chart handler configuration [c:\\TempImageFiles\\]. While running my code.

Intially I was getting

Answer 1

You can circumvent temporary image caching by using BinaryStreaming.
Google should do the rest.
It worked for me on Linux, where it threw an InvalidDirectory Exception for Linux paths.

(RenderType="BinaryStreaming")

Codebehind:

protected void Page_Load(object sender, EventArgs e)
        {
            FillChartFromDataBase();
        }



        public void FillChartFromDataBase()
        {
            System.Data.DataTable table = new System.Data.DataTable();
            table.Columns.Add("Area", typeof(double));
            table.Columns.Add("Label", typeof(string));

            System.Data.DataRow row = table.NewRow();
            row["Area"] = 791;
            row["Label"] = "HNF 1";
            table.Rows.Add(row);

            row = table.NewRow();
            row["Area"] = 978;
            row["Label"] = "HNF 2";
            table.Rows.Add(row);

            row = table.NewRow();
            row["Area"] = 1262;
            row["Label"] = "HNF 3";
            table.Rows.Add(row);

            row = table.NewRow();
            row["Area"] = 1650;
            row["Label"] = "HNF 4";
            table.Rows.Add(row);

            row = table.NewRow();
            row["Area"] = 2519;
            row["Label"] = "HNF 5";
            table.Rows.Add(row);

            row = table.NewRow();
            row["Area"] = 6071;
            row["Label"] = "HNF 6";
            table.Rows.Add(row);


            // Set chart custom palette
            ChartDIN277.Palette = System.Web.UI.DataVisualization.Charting.ChartColorPalette.None;

            //ChartDIN277.PaletteCustomColors = New System.Drawing.Color() {System.Drawing.Color.Red, System.Drawing.Color.Blue}
            ChartDIN277.PaletteCustomColors = COR.Design.ColorPalette.Generate(System.Drawing.Color.ForestGreen, table.Rows.Count - 1);

            // http://student.csdn.net/space.php?uid=383581&do=blog&id=32768
            //ChartDIN277.Palette = System.Web.UI.DataVisualization.Charting.ChartColorPalette.None; 
            //ChartDIN277.PaletteCustomColors = new Color[] { System.Drawing.Color.Red, System.Drawing.Color.Blue};
            //// Hide all series empty data point by making them transparent
            //Chart.Series[0].EmptyPointStyle.Color = Color.Transparent; 
            //// Set color for the whole series
            //Chart.Series[0].Color = Color.Green;

            //// Set color of a single data point
            //Chart.Series[0].Points[5].Color = Color.Red;

            this.ChartDIN277.DataSource = table;
            this.ChartDIN277.DataBind();
        }

or create an ashx handler, like this

Imports System.Web
Imports System.Web.Services

Public Class ChartCreator
    Implements System.Web.IHttpHandler

    Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest

        context.Response.ContentType = "image/jpeg"

        Dim yValues As Double() = {10, 27.5, 7, 12, 45.5}
        Dim xNames As String() = {"Mike", "John", "William", "George", "Alex"}


        Dim mychart As System.Web.UI.DataVisualization.Charting.Chart
        mychart = New System.Web.UI.DataVisualization.Charting.Chart
        Dim mychartarea As New System.Web.UI.DataVisualization.Charting.ChartArea()
        mychartarea.Name = "ChartArea1"
        mychartarea.BackColor = Drawing.Color.Transparent

        mychart.ChartAreas.Add(mychartarea)

        Dim myseries As New System.Web.UI.DataVisualization.Charting.Series()
        myseries.ChartArea = mychartarea.Name
        myseries.ChartType = System.Web.UI.DataVisualization.Charting.SeriesChartType.Pie
        myseries.Name = "Series1"

        mychart.Series.Add(myseries)
        mychart.BackColor = Drawing.Color.Transparent

        mychart.Series(0).Points.DataBindXY(xNames, yValues)
        mychart.Series(0).Points.DataBindXY(xNames, yValues)


        ' http://msdn.microsoft.com/en-us/library/system.web.ui.datavisualization.charting.rendertype.aspx
        ' ImageTag, BinaryStreaming, ImageMap
        ' mychart.RenderType = System.Web.UI.DataVisualization.Charting.RenderType.BinaryStreaming

        mychart.ImageType = System.Web.UI.DataVisualization.Charting.ChartImageFormat.Png


        'mychart.SaveImage(System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "mychart.png"))
        mychart.SaveImage(context.Response.OutputStream)


        'getResizedImage(context.Request.PhysicalPath,Width,Height);
        'context.Response.OutputStream
        context.Response.End()

    End Sub

    ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property

End Class