使用 VB.NET 將 Gridview 導出到 Excel

Question

我有一個帶有 gridview 的頁面，它使用的是母版頁。 導出按鈕位於母版頁上，我只需要從中導出實際頁面上的 gridview 數據。

gridview 上有一些隱藏的列，這些列不能包含在導出到 Excel 的數據中。

如何在不抓取 gridview 周圍（即頁面本身）的任何其他格式的情況下執行此操作？

我基本上使用此 URL 上的代碼： 將 Gridview 數據導出到 Excel - 更改標題名稱（我已轉換為 VB.NET），但它似乎將網格上的所有數據導出到 Excel，包括隱藏列。

Answer 1

一段時間以來，我一直在尋找解決方案。 我之前查看過您的代碼，但似乎無法使其正常工作 - 但這是因為缺乏知識。 所以對於可能遇到同樣問題的其他人，這是我的方案和解決方案，請注意這是在 VB 中，可以使用任何在線轉換工具進行轉換：

場景：我有一個帶有導出按鈕的母版頁，該按鈕使用母版頁從頁面上的 gridview 導出數據。

在帶有 Gridview 的頁面的 Page_Load 事件中，我使用了以下代碼：

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

---

然后我創建了公共子：

---

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

---

然后添加以下內容：

Public Overrides Sub VerifyRenderingInServerForm(control As Control)
End Sub

不幸的是，這意味着它需要進入您希望從中導出 gridview 的每個頁面，但它為我完成了這項工作。 這只會導出 gridview 中的數據。

我希望這可以幫助任何遇到同樣問題的人。

Answer 2

我其實找到了另外一種方式，不影響頁面本身，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 中導出 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#

私人無效通用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;


    }