使用 VB.NET 将 Gridview 导出到 Excel

Question

我有一个带有 gridview 的页面，它使用的是母版页。 导出按钮位于母版页上，我只需要从中导出实际页面上的 gridview 数据。

gridview 上有一些隐藏的列，这些列不能包含在导出到 Excel 的数据中。

如何在不抓取 gridview 周围（即页面本身）的任何其他格式的情况下执行此操作？

我基本上使用此 URL 上的代码： 将 Gridview 数据导出到 Excel - 更改标题名称（我已转换为 VB.NET），但它似乎将网格上的所有数据导出到 Excel，包括隐藏列。

Answer 1

一段时间以来，我一直在寻找解决方案。 我之前查看过您的代码，但似乎无法使其正常工作 - 但这是因为缺乏知识。 所以对于可能遇到同样问题的其他人，这是我的方案和解决方案，请注意这是在 VB 中，可以使用任何在线转换工具进行转换：

场景：我有一个带有导出按钮的母版页，该按钮使用母版页从页面上的 gridview 导出数据。

在带有 Gridview 的页面的 Page_Load 事件中，我使用了以下代码：

Dim myMasterPage As MasterPageName = Page.Master

Dim exportButton As System.Web.UI.WebControls.Button = myMasterPage.FindControl("ButExportExcel")

If (exportButton IsNot Nothing) Then 
    AddHandler exportButton.Click, AddressOf Me.ButExportExcel_Click
End If

---

然后我创建了公共子：

---

Private Sub ButExportExcel_Click(ByVal sender As Object, ByVal e As System.EventArgs)

    Dim sMethod = "ButExportExcel_Click"
    Dim sErrorMessage = ""
    Dim sExportFileName As String = ""

    Try

        sExportFileName = Path.GetFileName(Request.PhysicalPath)
        sExportFileName = sExportFileName.Substring(0, sExportFileName.Length - 5) & ".xls"

        Response.Clear()
        Response.AddHeader("content-disposition", "attachment; filename=" & sExportFileName)
        Response.ContentType = "application/vnd.xls"
        Dim WriteItem As System.IO.StringWriter = New System.IO.StringWriter()
        Dim htmlText As System.Web.UI.HtmlTextWriter = New HtmlTextWriter(WriteItem)
        SummaryGridView.AllowPaging = False
        'Dim dtSupplier As DataTable = CType(ViewState("dtSupplier"), DataTable)
        'SummaryGridView.DataSource = dtSupplier
        SummaryGridView.DataBind()
        SummaryGridView.RenderControl(htmlText)
        Response.Write(WriteItem.ToString())
        Response.End()

    Catch ex As Exception



    End Try
End Sub

---

然后添加以下内容：

Public Overrides Sub VerifyRenderingInServerForm(control As Control)
End Sub

不幸的是，这意味着它需要进入您希望从中导出 gridview 的每个页面，但它为我完成了这项工作。 这只会导出 gridview 中的数据。

我希望这可以帮助任何遇到同样问题的人。

Answer 2

我其实找到了另外一种方式，不影响页面本身，只需要在masterpage上做就可以了。

Public Overrides Sub VerifyRenderingInServerForm(control As Control) 不是必需的：

'在 Masterpage 中导出 Click 事件：

Public Sub ButExportExcel_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ButExportExcel.Click

'*** take the paging and sorting out of the excel spreadsheet

Try
Dim sgv As GridView = CType(ContentPlaceHolder_body.FindControl("SummaryGridView"), GridView)
        If (sgv IsNot Nothing) Then
            sgv.AllowPaging = False
            sgv.AllowSorting = False
            sgv.DataBind()
        End If

        Dim sExportFileName As String = ""

        sExportFileName = Path.GetFileName(Request.PhysicalPath)
        sExportFileName = sExportFileName.Substring(0, sExportFileName.Length - 5) & ".xls"

        Export2(sExportFileName, sgv)

Catch ex As Exception

End Try

End Sub

'Export Sub
Public Sub Export2(ByVal fileName As String, ByVal gv As GridView)
    Dim sExportFileName As String = ""
    Dim sStringToReplace As String = ""

    gv.HeaderStyle.ForeColor = Drawing.Color.Black
    gv.HeaderStyle.BackColor = Drawing.Color.White
    gv.RowStyle.BackColor = Drawing.Color.White
    gv.HeaderStyle.Font.Bold = True
    gv.HeaderStyle.Font.Size = 10

    sExportFileName = Path.GetFileName(Request.PhysicalPath)
    sExportFileName = sExportFileName.Substring(0, sExportFileName.Length - 5) & ".xls"

    Dim attachment As String = "attachment; filename=" & sExportFileName
    HttpContext.Current.Response.ClearContent()
    HttpContext.Current.Response.AddHeader("content-disposition", attachment)
    HttpContext.Current.Response.ContentType = "application/ms-excel"
    Dim stw As New StringWriter()
    Dim htextw As New HtmlTextWriter(stw)

    Dim parent As Control = gv.Parent
    Dim GridIndex As Integer = 0
    If parent IsNot Nothing Then
        GridIndex = parent.Controls.IndexOf(gv)
        parent.Controls.Remove(gv)
    End If

    gv.RenderControl(htextw)

    If parent IsNot Nothing Then
        parent.Controls.AddAt(GridIndex, gv)
    End If

    'gv.RenderControl(htextw)
    HttpContext.Current.Response.Write(stw.ToString())
    Dim fi As New FileInfo(Server.MapPath("../JumpStart.css"))
    Dim sb As New System.Text.StringBuilder()
    Dim sr As StreamReader = fi.OpenText()
    'sStringToReplace = "class=""generalheader"""
    While sr.Peek() >= 0
        sb.Append(sr.ReadLine())
    End While
    sr.Close()

    Dim outputHtml = "<html><head><style type='text/css'>" + sb.ToString() + "</style></head>" + stw.ToString() + "</html>"

    Response.Write(outputHtml.ToString)

    'Response.Write("<html><head><style type='text/css'>" + sb.ToString() + "</style></head>" + stw.ToString() + "</html>")
    stw = Nothing
    htextw = Nothing
    Response.Flush()
    Response.[End]()


End Sub

Answer 3

ACA LES DEJO UNA FUNCION MENOS COMPLICADA Y FUNCIONAL PROBADA AL 2019

PARA VB.NET

Private Sub GenerarExcel()

    Dim excel As Microsoft.Office.Interop.Excel.Application = New Microsoft.Office.Interop.Excel.Application()
    excel.Application.Workbooks.Add(True)
    Dim ColumnIndex As Integer = 0
    For Each col As DataGridViewColumn In GrillaReporte.Columns
        ColumnIndex += 1
        excel.Cells(1, ColumnIndex) = col.Name

    Next

    Dim rowIndex As Integer = 0
    For Each row As DataGridViewRow In GrillaReporte.Rows

        rowIndex += 1
        ColumnIndex = 0
        For Each col As DataGridViewColumn In GrillaReporte.Columns

            ColumnIndex += 1
            excel.Cells(rowIndex + 1, ColumnIndex) = row.Cells(col.Name).Value

        Next


    Next

    excel.Visible = True


End Sub

PARA C#

私人无效通用Excel（）{

        Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();

        excel.Application.Workbooks.Add(true);

        int ColumnIndex = 0;

        foreach (DataGridViewColumn col in GrillaArticulos.Columns)
        {
            ColumnIndex++;

            excel.Cells[1, ColumnIndex] = col.Name;

        }

        int rowIndex = 0;

        foreach (DataGridViewRow row in GrillaArticulos.Rows)
        {

            rowIndex++;

            ColumnIndex = 0;

            foreach (DataGridViewColumn col in GrillaArticulos.Columns)
            {

                ColumnIndex++;

                excel.Cells[rowIndex + 1, ColumnIndex] = row.Cells[col.Name].Value;

            }

        }

        excel.Visible = true;


    }