将DataGrid中数据倒出Excel文件并下载

2022-07-15 80酷酷网 80kuku.com

　　datagrid|excel|数据|下载   Imports System
  Imports System.Text
  Namespace toExcel

  '功能：将ASP.net中DataGrid生成Excel文件下载。
  'Mountains改进：1、支持中文 2、隐藏列不显示
  '日期：2002.10.30
  Public Class DataGridToCSV

  Public Function GenerateFile(ByRef Page As System.Web.UI.Page, ByVal MyDataGrid As System.Web.UI.WebControls.DataGrid, ByVal FileName As String) As String

  Dim resp As HttpResponse
  Dim colCount As Integer = MyDataGrid.Columns.Count - 1

  resp = Page.Response

  resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312") '解决中文乱码之关键
  'resp.Charset = "utf-8"
  'resp.AddFileDependency(FileName)
  'resp.ContentType = "Text/HTML"
  ''resp.AppendHeader("Content-Type", "text/html; charset=gb2312")

  resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName) '必要，做成下载文件


  Dim colHeaders As String = ""
  Dim strItems As StringBuilder = New StringBuilder()

  Dim myCol As DataGridColumn

  Dim i As Integer

  For i = 0 To colCount
  myCol = MyDataGrid.Columns(i)
  If myCol.Visible = True Then
  colHeaders = colHeaders & myCol.HeaderText.ToString & ","
  End If
  Next

  If colHeaders.Length > 0 Then
  colHeaders = colHeaders.Substring(0, colHeaders.LastIndexOf(","))
  End If

  colHeaders = colHeaders & Chr(13) & Chr(10)


  resp.Write(colHeaders)

  Dim colRow As String

  Dim item As DataGridItem

  For Each item In MyDataGrid.Items
  resp.Write(FormatExportRow(colCount, item, MyDataGrid))
  Next item

  resp.End()

  End Function

  Private Function FormatExportRow(ByVal colCount As Integer, ByVal Item As DataGridItem, ByVal MyDataGrid As System.Web.UI.WebControls.DataGrid) As String
  Dim strItem As String
  Dim i As Integer

  For i = 0 To colCount
  If MyDataGrid.Columns(i).Visible = True Then
  If Item.Cells(i).Text Is System.DBNull.Value Then
  Item.Cells(i).Text = ""
  End If
  If i = colCount Then
  strItem += Item.Cells(i).Text.ToString & Chr(13) & Chr(10)
  Else
  strItem += Item.Cells(i).Text.ToString & ","
  End If
  End If
  Next
  strItem = Replace(strItem, " ", " ")
  Return strItem
  End Function


  End Class

  End Namespace