webentwicklung-frage-antwort-db.com.de

datenexport von Daten in Excel in asp.net

ich habe versucht, Raster-Ansichtsdaten nach Excel zu übertragen ... Aber die Ausgabe ist ein leeres Excel-Blatt.

protected void btnexcel_Click1(object sender, EventArgs e)
{
    Response.Clear();
    Response.Buffer = true;
    Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls");
    Response.Charset = "";
    Response.ContentType = "application/vnd.ms-Excel";

    StringWriter sw = new StringWriter();
    HtmlTextWriter hw = new HtmlTextWriter(sw);

    gvdetails.AllowPaging = false;
    gvdetails.DataBind(); 
    gvdetails.HeaderRow.Style.Add("background-color", "#FFFFFF");
    gvdetails.HeaderRow.Cells[0].Style.Add("background-color", "green");
    gvdetails.HeaderRow.Cells[1].Style.Add("background-color", "green");
    gvdetails.HeaderRow.Cells[2].Style.Add("background-color", "green");
    for (int i = 0; i < gvdetails.Rows.Count;i++ )
    {
        GridViewRow row = gvdetails.Rows[i];
        row.BackColor = System.Drawing.Color.White;
        row.Attributes.Add("class", "textmode");
        if (i % 2 != 0)
        {
            row.Cells[0].Style.Add("background-color", "#C2D69B");
            row.Cells[1].Style.Add("background-color", "#C2D69B");
            row.Cells[2].Style.Add("background-color", "#C2D69B");
        }
    }

    string style = @"<style> .textmode { mso-number-format:\@; } </style>"; 
    Response.Write(style); 

    Response.Output.Write(sw.ToString());
    Response.End();
}
8
Vikash Chauhan

Ihr Blatt ist leer, da Ihr String-Writer in null ... __ steht

System.Web.UI.HtmlTextWriter htmlWrite =
    new HtmlTextWriter(stringWrite);

    GridView1.RenderControl(htmlWrite);

Hier ist der vollständige Code

protected void Button1_Click(object sender, EventArgs e)
{
    Response.Clear();

    Response.AddHeader("content-disposition", "attachment;
    filename=FileName.xls");


    Response.ContentType = "application/vnd.xls";

    System.IO.StringWriter stringWrite = new System.IO.StringWriter();

    System.Web.UI.HtmlTextWriter htmlWrite =
    new HtmlTextWriter(stringWrite);

    GridView1.RenderControl(htmlWrite);

    Response.Write(stringWrite.ToString());

    Response.End();

}
13
Ratna

kann ein Problem bei der Datenbindung in Excel-Export sein. Überprüfen Sie, ob die Daten ordnungsgemäß in einer Rasteransicht abgelegt sind oder nicht.

Verwenden Sie diesen Code für die Exportrasteransicht in einer Excel-Tabelle. Beachten Sie, dass Sie die iTextSharp-DLL in Ihrem Projekt hinzufügen müssen.

protected void btnExportExcel_Click(object sender, EventArgs e)
    {
        Response.Clear();
        Response.Buffer = true;
        Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.xls");
        Response.Charset = "";
        Response.ContentType = "application/vnd.ms-Excel";

        StringWriter sw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        GridView1.AllowPaging = false;

        // Re-Bind data to GridView 

        using (CompMSEntities1 CompObj = new CompMSEntities1())
        {
            Start = Convert.ToDateTime(txtStart.Text);
            End = Convert.ToDateTime(txtEnd.Text);

            GridViewSummaryReportCategory.DataSource = CompObj.SP_Category_Summary(Start, End);
            SP_Category_Summary_Result obj1 = new SP_Category_Summary_Result();
            GridView1.DataBind();
           GridView1.Visible = true;
            ExportTable.Visible = true;
        }

        //Change the Header Row back to white color

        GridView1.HeaderRow.Style.Add("background-color", "#FFFFFF");


       GridView1.Style.Add(" font-size", "10px");




        //Apply style to Individual Cells

        GridView1.HeaderRow.Cells[0].Style.Add("background-color", "green");
        GGridView1.HeaderRow.Cells[1].Style.Add("background-color", "green");
        GridView1.HeaderRow.Cells[2].Style.Add("background-color", "green");
        GridView1.HeaderRow.Cells[3].Style.Add("background-color", "green");
        GridView1.HeaderRow.Cells[4].Style.Add("background-color", "green");

        for (int i = 1; i < GridView1.Rows.Count; i++)
        {
            GridViewRow row = GridView1.Rows[i];

            //Change Color back to white

            row.BackColor = System.Drawing.Color.White;

            //Apply text style to each Row

        //    row.Attributes.Add("class", "textmode");

            //Apply style to Individual Cells of Alternating Row

            if (i % 2 != 0)
            {
                row.Cells[0].Style.Add("background-color", "#C2D69B");
                row.Cells[1].Style.Add("background-color", "#C2D69B");
                row.Cells[2].Style.Add("background-color", "#C2D69B");
                row.Cells[3].Style.Add("background-color", "#C2D69B");
                row.Cells[4].Style.Add("background-color", "#C2D69B");
            }
        }
        GridView1.RenderControl(hw);

        //style to format numbers to string

        string style = @"<style> .textmode { mso-number-format:\@; } </style>";

        Response.Write(style);
        Response.Output.Write(sw.ToString());
        Response.Flush();
        Response.End();
    }
3
Black Cloud

Ich denke es wird dir helfen

string filename = String.Format("Results_{0}_{1}.xls", DateTime.Today.Month.ToString(), DateTime.Today.Year.ToString());
        if (!string.IsNullOrEmpty(GRIDVIEWNAME.Page.Title))
            filename = GRIDVIEWNAME.Page.Title + ".xls";

        HttpContext.Current.Response.Clear();

        HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + filename);


        HttpContext.Current.Response.ContentType = "application/vnd.ms-Excel";
        HttpContext.Current.Response.Charset = "";

        System.IO.StringWriter stringWriter = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter htmlWriter = new HtmlTextWriter(stringWriter);



        System.Web.UI.HtmlControls.HtmlForm form = new System.Web.UI.HtmlControls.HtmlForm();
        GRIDVIEWNAME.Parent.Controls.Add(form);
        form.Controls.Add(GRIDVIEWNAME);
        form.RenderControl(htmlWriter);

        HttpContext.Current.Response.Write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />");
        HttpContext.Current.Response.Write(stringWriter.ToString());
        HttpContext.Current.Response.End();
3
Such

Noch etwas zu überprüfen ist, ob Viewstate aktiviert ist (ich habe es gerade gestern gelöst). Wenn Sie ViewState nicht aktiviert haben, bleibt die Rasteransicht leer, bis Sie sie erneut laden.

0
Jeff B

Am besten verwenden Sie closedxml. Unten ist der Link als Referenz

https://closedxml.codeplex.com/wikipage?title=Adding%20DataTable%20as%20Worksheet&referringTitle=Documentation

und Sie können einfach verwenden 

    var wb = new ClosedXML.Excel.XLWorkbook();
DataTable dt = GeDataTable();//refer documentaion

wb.Worksheets.Add(dt);

Response.Clear();
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition", "attachment;filename=\"FileName.xlsx\"");

using (var ms = new System.IO.MemoryStream()) {
    wb.SaveAs(ms);
    ms.WriteTo(Response.OutputStream);
    ms.Close();
}

Response.End();
0
Taran

Anstatt alle diese Schritte auszuführen, können Sie einen einfacheren Ansatz verwenden (siehe unten).

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);
            gv.RenderControl(htw);
            Response.Write(sw.ToString());
            Response.End();

Sie können den gesamten Lösungsweg hier

0
Pradip