Export GridView To WordExcelPDFCSV in ASP.Net

 转自：

http://www.aspsnippets.com/Articles/Export-GridView-To-WordExcelPDFCSV-in-ASP.Net.aspx

 

In this article, I will explain how to export GridView to Word, Excel, PDF and CSV formats.

Exporting to Word, Excel and CSV can be easily achieved using ASP.Net without any third party tools, but for exporting GridView to PDF I am usingiTextSharp which is a free library for exporting html to PDF.

 

To start with I have a GridView in which I am showing Customers records from the NorthWind Database.

The HTML markup of the GridView is as shown below

 

<asp:GridView ID="GridView1" runat="server"

    AutoGenerateColumns = "false" Font-Names = "Arial"

    Font-Size = "11pt" AlternatingRowStyle-BackColor = "#C2D69B" 

    HeaderStyle-BackColor = "green" AllowPaging ="true"  

    OnPageIndexChanging = "OnPaging" >

   <Columns>

    <asp:BoundField ItemStyle-Width = "150px" DataField = "CustomerID"

    HeaderText = "CustomerID" />

    <asp:BoundField ItemStyle-Width = "150px" DataField = "City"

    HeaderText = "City"/>

    <asp:BoundField ItemStyle-Width = "150px" DataField = "Country"

    HeaderText = "Country"/>

    <asp:BoundField ItemStyle-Width = "150px" DataField = "PostalCode"

    HeaderText = "PostalCode"/>

   </Columns>

</asp:GridView>

 

In the figure below the GridView is shown with four buttons

1.     Export To Word

2.     Export To Excel

3.     Export To PDF

4.     Export To CSV

Export to Microsoft Word Format

 

C#

protected void btnExportWord_Click(object sender, EventArgs e)

{

    Response.Clear();

    Response.Buffer = true;

    Response.AddHeader("content-disposition",

    "attachment;filename=GridViewExport.doc");

    Response.Charset = "";

    Response.ContentType = "application/vnd.ms-word ";

    StringWriter sw= new StringWriter();

    HtmlTextWriter hw = new HtmlTextWriter(sw);

    GridView1.AllowPaging = false;

    GridView1.DataBind();

    GridView1.RenderControl(hw);

    Response.Output.Write(sw.ToString());

    Response.Flush();

    Response.End();

}

 

VB.Net

Protected Sub btnExportWord_Click(ByVal sender As Object,

    ByVal e As EventArgs)

        Response.Clear()

        Response.Buffer = True

        Response.AddHeader("content-disposition",

        "attachment;filename=GridViewExport.doc")

        Response.Charset = ""

        Response.ContentType = "application/vnd.ms-word "

        Dim sw As New StringWriter()

        Dim hw As New HtmlTextWriter(sw)

        GridView1.AllowPaging = False

        GridView1.DataBind()

        GridView1.RenderControl(hw)

        Response.Output.Write(sw.ToString())

        Response.Flush()

        Response.End()

    End Sub

 

The above function renders the GridView contents as Microsoft Word format. You will notice I have disabled paging before exporting, so that all the pages are exported.

The Output Exported File

Export to Microsoft Excel Format

 

For exporting the document to Excel if you do it directly as done in case of word the row background color is applied throughout to all the columns in the Excel Sheet hence in order to avoid it. I have done a workaround below.

First I am changing the background color of each row back to white.

Then I am applying the background color to each individual cell rather than the whole row. Thus when you export now you will notice that the formatting is applied only to the GridView cells and not all

Also I am applying textmode style class to all cells and then adding the styleCSS class to the GridView before rendering it, this ensures that all the contents of GridView are rendered as text.

 

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;

GridView1.DataBind();

 

//Change the Header Row back to white color

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

 

//Apply style to Individual Cells

GridView1.HeaderRow.Cells[0].Style.Add("background-color", "green");

GridView1.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");  

 

for (int i = 0; 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");  

    }

}

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();

}

 

 

VB.Net

 

Protected Sub btnExportExcel_Click(ByVal sender As Object,

ByVal e As EventArgs)

  Response.Clear()

  Response.Buffer = True

 

  Response.AddHeader("content-disposition",

  "attachment;filename=GridViewExport.xls")

  Response.Charset = ""

  Response.ContentType = "application/vnd.ms-excel"

 

  Dim sw As New StringWriter()

  Dim hw As New HtmlTextWriter(sw)

 

  GridView1.AllowPaging = False

  GridView1.DataBind()

 

  'Change the Header Row back to white color

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

 

  'Apply style to Individual Cells

  GridView1.HeaderRow.Cells(0).Style.Add("background-color", "green")

  GridView1.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")

 

  For i As Integer = 0 To GridView1.Rows.Count - 1

   Dim row As GridViewRow = 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 Mod 2 <> 0 Then

    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")

   End If

  Next

  GridView1.RenderControl(hw)

 

  'style to format numbers to string

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

  Response.Write(style)

  Response.Output.Write(sw.ToString())

  Response.Flush()

  Response.End()

End Sub

 

The Output Exported File

Export to Portable Document Format

 

For exporting the GridView to PDF I am using the iTextSharp Library. You will need to Add Reference for the iTextSharp Library in your Website.

Then import the following Namespaces

 

C#

using iTextSharp.text;

using iTextSharp.text.pdf;

using iTextSharp.text.html;

using iTextSharp.text.html.simpleparser;

 

VB.Net

Imports iTextSharp.text

Imports iTextSharp.text.pdf

Imports iTextSharp.text.html

Imports iTextSharp.text.html.simpleparser

 

By default the iTextSharp Library does not support background color of table cells or table rows

Hence when you render it as PDF your GridView is rendered without any formatting.

Recently I read an article on hamang.net where the author has provided the snippet to modify the iTextSharp so that it exports the HTML with background color.

 

For this tutorial, I have already modified the iTextSharp Library DLL so that the GridView is rendered with all the background color used. You can refer the code for exporting GridView to PDF below

 

              

C#

protected void btnExportPDF_Click(object sender, EventArgs e)

{

    Response.ContentType = "application/pdf";

    Response.AddHeader("content-disposition",

     "attachment;filename=GridViewExport.pdf");

    Response.Cache.SetCacheability(HttpCacheability.NoCache);

    StringWriter sw = new StringWriter();

    HtmlTextWriter hw = new HtmlTextWriter(sw);

    GridView1.AllowPaging = false;

    GridView1.DataBind();

    GridView1.RenderControl(hw);

    StringReader sr = new StringReader(sw.ToString());

    Document pdfDoc = new Document(PageSize.A4, 10f,10f,10f,0f);

    HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

    PdfWriter.GetInstance(pdfDoc, Response.OutputStream);

    pdfDoc.Open();

    htmlparser.Parse(sr);

    pdfDoc.Close();

    Response.Write(pdfDoc);

    Response.End(); 

}

 

VB.Net

Protected Sub btnExportPDF_Click(ByVal sender As Object,

ByVal e As EventArgs)

 Response.ContentType = "application/pdf"

 Response.AddHeader("content-disposition",

 "attachment;filename=GridViewExport.pdf")

 Response.Cache.SetCacheability(HttpCacheability.NoCache)

 Dim sw As New StringWriter()

 Dim hw As New HtmlTextWriter(sw)

 GridView1.AllowPaging = False

 GridView1.DataBind()

 GridView1.RenderControl(hw)

 Dim sr As New StringReader(sw.ToString())

 Dim pdfDoc As New Document(PageSize.A4, 10.0F, 10.0F, 10.0F, 0.0F)

 Dim htmlparser As New HTMLWorker(pdfDoc)

 PdfWriter.GetInstance(pdfDoc, Response.OutputStream)

 pdfDoc.Open()

 htmlparser.Parse(sr)

 pdfDoc.Close()

 Response.Write(pdfDoc)

 Response.End()

End Sub

 

The Output Exported File

Export to Text/CSV

 

Finally comes exporting GridView to CSV or Text File delimited by a separator like comma.

To export the GridView as CSV, I am running a two for loops. While looping through the GridView columns and appending comma after each column and while looping through rows appending new line character. Refer the code below.

 

C#

protected void btnExportCSV_Click(object sender, EventArgs e)

{

    Response.Clear();

    Response.Buffer = true;

    Response.AddHeader("content-disposition",

     "attachment;filename=GridViewExport.csv");

    Response.Charset = "";

    Response.ContentType = "application/text";

 

    GridView1.AllowPaging = false;

    GridView1.DataBind();

 

    StringBuilder sb = new StringBuilder();

    for (int k = 0; k < GridView1.Columns.Count; k++)

    {

        //add separator

        sb.Append(GridView1.Columns[k].HeaderText + ',');

    }

    //append new line

    sb.Append("\r\n");

    for (int i = 0; i < GridView1.Rows.Count; i++)

    {

        for (int k = 0; k < GridView1.Columns.Count; k++)

        {

            //add separator

            sb.Append(GridView1.Rows[i].Cells[k].Text + ',');

        }

        //append new line

        sb.Append("\r\n");

    }

    Response.Output.Write(sb.ToString());

    Response.Flush();

    Response.End();

}

      

 

VB.Net

Protected Sub btnExportCSV_Click(ByVal sender As Object,

ByVal e As EventArgs)

 Response.Clear()

 Response.Buffer = True

 Response.AddHeader("content-disposition",

 "attachment;filename=GridViewExport.csv")

 Response.Charset = ""

 Response.ContentType = "application/text"

 

 GridView1.AllowPaging = False

 GridView1.DataBind()

 

 Dim sb As New StringBuilder()

 For k As Integer = 0 To GridView1.Columns.Count - 1

  'add separator

  sb.Append(GridView1.Columns(k).HeaderText + ","c)

 Next

 'append new line

 sb.Append(vbCr & vbLf)

 For i As Integer = 0 To GridView1.Rows.Count - 1

  For k As Integer = 0 To GridView1.Columns.Count - 1

   'add separator

   sb.Append(GridView1.Rows(i).Cells(k).Text + ","c)

  Next

  'append new line

  sb.Append(vbCr & vbLf)

 Next

 Response.Output.Write(sb.ToString())

 Response.Flush()

 Response.End()

End Sub

 

The Output Exported File

When you run the application first time and click export you might receive the following error

To avoid the error you will need to add this event which ensures that the GridView is Rendered before exporting.

  

C#

public override void VerifyRenderingInServerForm(Control control)

{

    /* Verifies that the control is rendered */

}

 

VB.Net

Public Overloads Overrides Sub VerifyRenderingInServerForm

(ByVal control As Control)

    ' Verifies that the control is rendered

End Sub

 

This completes the article you can view the live demohere

The source code is available in C# and VB.Net here

 

GridViewExport.zip (1.15 mb)