ASPxGridExporterBase.WriteCsv(Stream, CsvExportOptionsEx) Method

Exports the grid’s data to a stream in CSV format with the specified export options.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v24.2.dll

Declaration

C#

public void WriteCsv(
    Stream stream,
    CsvExportOptionsEx exportOptions
)

VB.NET

Public Sub WriteCsv(
    stream As Stream,
    exportOptions As CsvExportOptionsEx
)

Parameters

Name	Type	Description
stream	Stream	A Stream object to which the data is exported.
exportOptions	CsvExportOptionsEx	A CsvExportOptionsEx object that provides export options.

Remarks

Note

Before exporting a grid, the ASPxGridExporterBase component creates an export document on a server. Therefore, when you export a large amount of data to a server with limited memory, the OutOfMemoryException exception may appear.

Example

Default.aspx

<form id="frmMain" runat="server">
<dx:ASPxGridView ID="Grid" runat="server" KeyFieldName="ID" OnDataBinding="Grid_DataBinding">
    <Columns>
        <dx:GridViewDataTextColumn FieldName="C1" />
        <dx:GridViewDataSpinEditColumn FieldName="C2" />
        <dx:GridViewDataTextColumn FieldName="C3" />
        <dx:GridViewDataCheckColumn FieldName="C4" />
        <dx:GridViewDataDateColumn FieldName="C5" />
    </Columns>
</dx:ASPxGridView>
<dx:ASPxGridViewExporter ID="Exporter" runat="server" GridViewID="Grid">
</dx:ASPxGridViewExporter>
<dx:ASPxButton ID="BtnExportToCSV" runat="server" Text="Export To CSV" OnClick="BtnExportToCSV_Click">
</dx:ASPxButton>
<dx:ASPxButton ID="BtnExportToPDF" runat="server" Text="Export To PDF" OnClick="BtnExportToPDF_Click">
</dx:ASPxButton>
<dx:ASPxButton ID="BtnExportToRTF" runat="server" Text="Export To RTF" OnClick="BtnExportToRTF_Click">
</dx:ASPxButton>
<dx:ASPxButton ID="BtnExportToXLS" runat="server" Text="Export To XLS" OnClick="BtnExportToXLS_Click">
</dx:ASPxButton>
<dx:ASPxButton ID="BtnExportToXLSX" runat="server" Text="Export To XLSX" OnClick="BtnExportToXLSX_Click">
</dx:ASPxButton>
</form>

Default.aspx.cs

using System;
using System.Linq;
using System.IO;

public partial class _Default: System.Web.UI.Page {
    protected string DocumentsFolder = "~/App_Data/";
    protected string DocumentFileName = "Document";
    protected void Page_Load(object sender, EventArgs e) {
        if (!IsCallback && !IsPostBack) {
            Directory.EnumerateFiles(MapPath(DocumentsFolder)).ToList().ForEach(File.Delete);
            Grid.DataBind();
        }
    }
    protected void Grid_DataBinding(object sender, EventArgs e) {
        Grid.DataSource = Enumerable.Range(0, 100).Select(i => new {
            ID = i,
            C1 = i % 2,
            C2 = i * 0.5 % 3,
            C3 = "C3 " + i,
            C4 = i % 2 == 0,
            C5 = new DateTime(2015 + i, 12, 16)
        }).ToList();
    }
    protected void BtnExportToCSV_Click(object sender, EventArgs e) {
        SaveFile(actionToCall => Exporter.WriteCsv(actionToCall), "csv");
    }
    protected void BtnExportToPDF_Click(object sender, EventArgs e) {
        SaveFile(actionToCall => Exporter.WritePdf(actionToCall), "pdf");
    }
    protected void BtnExportToRTF_Click(object sender, EventArgs e) {
        SaveFile(actionToCall => Exporter.WriteRtf(actionToCall), "rtf");
    }
    protected void BtnExportToXLS_Click(object sender, EventArgs e) {
        SaveFile(actionToCall => Exporter.WriteXls(actionToCall), "xls");
    }
    protected void BtnExportToXLSX_Click(object sender, EventArgs e) {
        SaveFile(actionToCall => Exporter.WriteXlsx(actionToCall), "xlsx");
    }
    protected void SaveFile(Action<Stream> action, string format) {
        using (MemoryStream memoryStream = new MemoryStream()) {
            action(memoryStream);
            memoryStream.Seek(0, SeekOrigin.Begin);
            using (FileStream fileStream = new FileStream(MapPath(
                    string.Format("{0}/{1}.{2}",
                    DocumentsFolder,
                    DocumentFileName,
                    format)
                ),
                FileMode.Create,
                FileAccess.Write)) {
                memoryStream.WriteTo(fileStream);
            }
        }
    }
}

Default.aspx.vb

Imports System
Imports System.Linq
Imports System.IO

Partial Public Class _Default
    Inherits System.Web.UI.Page

    Protected DocumentsFolder As String = "~/App_Data/"
    Protected DocumentFileName As String = "Document"
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
        If (Not IsCallback) AndAlso (Not IsPostBack) Then
            Directory.EnumerateFiles(MapPath(DocumentsFolder)).ToList().ForEach(Sub(f) File.Delete(f))
            Grid.DataBind()
        End If
    End Sub
    Protected Sub Grid_DataBinding(ByVal sender As Object, ByVal e As EventArgs)
        Grid.DataSource = Enumerable.Range(0, 100).Select(Function(i) New With {Key.ID = i, Key.C1 = i Mod 2, Key.C2 = i * 0.5 Mod 3, Key.C3 = "C3 " & i, Key.C4 = i Mod 2 = 0, Key.C5 = New Date(2015 + i, 12, 16)}).ToList()
    End Sub
    Protected Sub BtnExportToCSV_Click(ByVal sender As Object, ByVal e As EventArgs)
        SaveFile(Sub(actionToCall) Exporter.WriteCsv(actionToCall), "csv")
    End Sub
    Protected Sub BtnExportToPDF_Click(ByVal sender As Object, ByVal e As EventArgs)
        SaveFile(Sub(actionToCall) Exporter.WritePdf(actionToCall), "pdf")
    End Sub
    Protected Sub BtnExportToRTF_Click(ByVal sender As Object, ByVal e As EventArgs)
        SaveFile(Sub(actionToCall) Exporter.WriteRtf(actionToCall), "rtf")
    End Sub
    Protected Sub BtnExportToXLS_Click(ByVal sender As Object, ByVal e As EventArgs)
        SaveFile(Sub(actionToCall) Exporter.WriteXls(actionToCall), "xls")
    End Sub
    Protected Sub BtnExportToXLSX_Click(ByVal sender As Object, ByVal e As EventArgs)
        SaveFile(Sub(actionToCall) Exporter.WriteXlsx(actionToCall), "xlsx")
    End Sub
    Protected Sub SaveFile(ByVal action As Action(Of Stream), ByVal format As String)
        Using memoryStream As New MemoryStream()
            action(memoryStream)
            memoryStream.Seek(0, SeekOrigin.Begin)
            Using fileStream As New FileStream(MapPath(String.Format("{0}/{1}.{2}", DocumentsFolder, DocumentFileName, format)), FileMode.Create, FileAccess.Write)
                memoryStream.WriteTo(fileStream)
            End Using
        End Using
    End Sub
End Class