Question

我正在使用ASP.NET 4.5 Webform，我有一个Gridview（具有自定义TemplateField并从sqlDataSource获取数据）

我有这个事件将gridview内容导出到excel表，并且它完成了它的工作，除了创建的文件在用户打开时发出警告（我理解，因为创建的文件不是实际的excel文件）：

＆＃34;您尝试打开的文件格式与其他格式不同由文件扩展名＆＃34;
指定

protected void btnExport_Excel_Click(object sender, EventArgs e)
        {
            try
            {
                Response.Clear();
                Response.Buffer = true;
                Response.AddHeader("content-disposition", "attachment;filename=GV.xls");
                Response.Charset = "";
                Response.ContentType = "application/ms-excel";
                //Response.ContentType = "application/text";
                Response.ContentEncoding = System.Text.Encoding.Unicode;
                Response.BinaryWrite(System.Text.Encoding.Unicode.GetPreamble());

                using (StringWriter sw = new StringWriter())
                {
                    HtmlTextWriter hw = new HtmlTextWriter(sw);

                    //To Export all pages
                    GridView4.AllowPaging = false;
                    GridView4.AllowSorting = false;
                    GridView4.ShowFooter = false;
                    GridView4.DataBind();
                    //this.BindGrid();

                    GridView4.HeaderRow.BackColor = Color.White;
                    foreach (TableCell cell in GridView4.HeaderRow.Cells)
                    {
                        cell.BackColor = GridView4.HeaderStyle.BackColor;
                    }
                    foreach (GridViewRow row in GridView4.Rows)
                    {
                        row.BackColor = Color.White;
                        foreach (TableCell cell in row.Cells)
                        {
                            if (row.RowIndex % 2 == 0)
                            {
                                cell.BackColor = GridView4.AlternatingRowStyle.BackColor;
                            }
                            else
                            {
                                cell.BackColor = GridView4.RowStyle.BackColor;
                            }
                            cell.CssClass = "textmode";
                        }
                    }

                    GridView4.RenderControl(hw);

                    //style to format numbers to string
                    string style = @"<style> .textmode { } </style>";
                    Response.Write(style);
                    Response.Output.Write(sw.ToString());
                    Response.Flush();
                    Response.End();
                }

                //Display message
                InfoPanel.Visible = true;
                InfoPanel.CssClass = "panel panel-success";
                lblMessage.CssClass = "text text-sucess bold";
                lblMessage.Text = "File has been exported!";

            }
            catch (Exception ex)
            {
                //Display message
                InfoPanel.Visible = true;
                lblMessage.Text = "<b>An error has occurred. Please try again later!</b></br>" + ex.Message;
                lblMessage.CssClass = "text text-danger bold";
                InfoPanel.CssClass = "panel panel-danger";
                panelResult.Visible = false;
            }
        }

Excel .xls文件中的结果很好（没有样式除了标题列，没有页脚，就像Gridview上显示的那样）：

我正在寻找另一种方法来避免这种警告，所以我看到人们喜欢使用
ClosedXML，所以我用以下事件替换上面的事件：

protected void ExportExcel(object sender, EventArgs e)
{
    DataTable dt = new DataTable("GridView_Data");
    foreach(TableCell cell in GridView4.HeaderRow.Cells)
    {
        dt.Columns.Add(cell.Text);
    }
    foreach (GridViewRow row in GridView4.Rows)
    {
        dt.Rows.Add();
        for (int i=0; i<row.Cells.Count; i++)
        {
            dt.Rows[dt.Rows.Count - 1][i] = row.Cells[i].Text;
        }
   }
    using (XLWorkbook wb = new XLWorkbook())
    {
        wb.Worksheets.Add(dt);

        Response.Clear();
        Response.Buffer = true;
        Response.Charset = "";
        Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        Response.AddHeader("content-disposition", "attachment;filename=GV.xlsx");

        using (MemoryStream MyMemoryStream = new MemoryStream())
        {
            wb.SaveAs(MyMemoryStream);
            MyMemoryStream.WriteTo(Response.OutputStream);
            Response.Flush();
            Response.End();
        }
    }
}

并且结果很糟糕（唯一不错的是导出的文件是真正的2007+ Excel工作表，因此没有警告）：

我如何获得＆＃34;好＆＃34;使用closedXML上面的结果？

Answer 1

您的第二部分代码（使用ClosedXML）中的主要问题是，您尝试将Text GridViewRow属性用于TemplateField字段列。如您所见[{3}}，您只能通过Text字段列和自动生成的字段列，通过BoundField属性获取字段值。

要从TemplateField获取值，您应该导航到包含值并从中获取值的内部控件。

如果您有以下列模板：

   <asp:TemplateField>
       <ItemTemplate>
           <asp:Label ID="labelName" runat="server" Text ='<%# Eval("ABC")%>' ></asp:Label>
       </ItemTemplate>
   </asp:TemplateField>

您的代码应为：

    for (int i=0; i<row.Cells.Count; i++)
    {
        dt.Rows[dt.Rows.Count - 1][i] = (row.Cells[i].FindControl("labelName") as Label).Text;
    }

修改

您的代码应如下所示：

protected void ExportExcel(object sender, EventArgs e) { DataTable dt = new DataTable("GridView_Data"); foreach (DataControlField col in GridView4.Columns) { dt.Columns.Add(col.HeaderText); } foreach (GridViewRow row in GridView4.Rows) { dt.Rows.Add(); for (int i = 0; i < row.Cells.Count; i++) { dt.Rows[dt.Rows.Count - 1][i] = (FindControl(row.Cells[i].Controls, "lbl") as Label).Text; } } //your code below is not changed } protected Control FindControl(ControlCollection collection, string id) { foreach (Control ctrl in collection) { if (ctrl.ID == id) return ctrl; } return null; }

确保Label中使用的所有TemplateField控件与ID具有相同的"lbl"：

<asp:TemplateField HeaderText="ID"> <ItemTemplate> <asp:Label ID="lbl" runat="server" Text ='<%# Eval("ID")%>' ></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Name"> <ItemTemplate> <asp:Label ID="lbl" runat="server" Text ='<%# Eval("Name")%>' ></asp:Label> </ItemTemplate> </asp:TemplateField> <asp:TemplateField HeaderText="Amount"> <ItemTemplate> <asp:Label ID="lbl" runat="server" Text ='<%# Eval("Amount")%>' ></asp:Label> </ItemTemplate> </asp:TemplateField>

Answer 2

我尝试了它的工作，请找代码希望它能帮到你：

<强>的Index.aspx

    <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Index.aspx.cs" Inherits="ExportExcel.Index" %>

  <!DOCTYPE html>

  <html xmlns="http://www.w3.org/1999/xhtml">
  <head runat="server">
  <title></title>
  </head>
  <body>
<form id="form1" runat="server">
<div>
    <asp:GridView ID="GridView1" HeaderStyle-BackColor="#3AC0F2" HeaderStyle- ForeColor="White"
        runat="server" AutoGenerateColumns="false">
        <Columns>
            <asp:BoundField DataField="Id" HeaderText="Id" ItemStyle-Width="30"  />
            <asp:TemplateField HeaderText="Name">
                <ItemTemplate>
                    <asp:TextBox ID="txtName" runat="server" Text='<%#Eval("Name") %>'></asp:TextBox>
                </ItemTemplate>
            </asp:TemplateField>
            <asp:TemplateField HeaderText="Country">
                <ItemTemplate>
                    <asp:Label ID="lblCountry" Text='<%# Eval("Country") %>' runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
    <br />
    <asp:Button ID="btnExport" Text="Export" runat="server" OnClick="btnExport_Click" />
</div>
</form>

<强> Index.aspx.cs

        using ClosedXML.Excel;
        using System;
        using System.Collections.Generic;
        using System.Data;
        using System.Drawing;
        using System.IO;
        using System.Linq;
        using System.Web;
        using System.Web.UI;
        using System.Web.UI.WebControls;

   namespace ExportExcel
    {
    public partial class Index : System.Web.UI.Page
    {
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!this.IsPostBack)
        {
            GetData();
        }
    }

    private void GetData()
    {
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)), new DataColumn("Name", typeof(string)), new DataColumn("Country", typeof(string)) });
        dt.Rows.Add(1, "abc", "UK");
        dt.Rows.Add(2, "def", "India");
        dt.Rows.Add(3, "ghi", "France");
        dt.Rows.Add(4, "jkl", "Russia");
        GridView1.DataSource = dt;
        GridView1.DataBind();
    }

    protected void btnExport_Click(object sender, EventArgs e)
    {
        try
        {
            DataTable dt = new DataTable("GridView_Data");
            foreach (TableCell cell in GridView1.HeaderRow.Cells)
            {
                dt.Columns.Add(cell.Text);
            }
            foreach (GridViewRow row in GridView1.Rows)
            {
                TextBox txtNameRow = (TextBox)row.FindControl("txtName");

                Label lblCountryRow = (Label)row.FindControl("lblCountry");

                DataRow drow = dt.NewRow();
                for (int i = 0; i < GridView1.Columns.Count; i++)
                {
                    drow[i] = row.Cells[i].Text;
                }
                drow["Name"] = txtNameRow.Text;
                drow["Country"] = lblCountryRow.Text;
                dt.Rows.Add(drow);
            }
            using (XLWorkbook wb = new XLWorkbook())
            {
                wb.Worksheets.Add(dt);

                Response.Clear();
                Response.Buffer = true;
                Response.Charset = "";
                Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                Response.AddHeader("content-disposition", "attachment;filename=GV.xlsx");

                using (MemoryStream MyMemoryStream = new MemoryStream())
                {
                    wb.SaveAs(MyMemoryStream);
                    MyMemoryStream.WriteTo(Response.OutputStream);
                    Response.Flush();
                    Response.End();
                }
            }

        }
        catch (Exception ex)
        {

            throw;
        }
    }




}
}

Answer 3

我在按钮点击事件上调用导出到Excel，如下所示

protected void btnPrint_Click(object sender, EventArgs e)
{
    fileName = string.Format(fileName, DateTime.Now.ToString("MMddyyyy_hhmmss"));
    Extensions.ExportToXcel_SomeReport(dt, fileName, this.Page);
}

从那里我有一个名为Extensions的utils类，我在其中定义了ExportToExcel_SomeReport方法

public static class Extensions
{
     internal static void ExportToXcel_SomeReport(DataTable dt, string fileName, Page page)
    {
        var recCount = dt.Rows.Count;
        RemoveHtmlSpecialChars(dt);
        fileName = string.Format(fileName, DateTime.Now.ToString("MMddyyyy_hhmmss"));
        var xlsx = new XLWorkbook();
        var ws = xlsx.Worksheets.Add("Some Report Name");
        ws.Style.Font.Bold = true;
        ws.Cell("C5").Value = "YOUR REPORT NAME";
        ws.Cell("C5").Style.Font.FontColor = XLColor.Black;
        ws.Cell("C5").Style.Font.SetFontSize(16.0);
        ws.Cell("E5").Value = DateTime.Now.ToString("MM/dd/yyyy HH:mm");
        ws.Range("C5:E5").Style.Font.SetFontSize(16.0);
        ws.Cell("A7").Value = string.Format("{0} Records", recCount);
        ws.Style.Font.Bold = false;
        ws.Cell(9, 1).InsertTable(dt.AsEnumerable());
        ws.Row(9).InsertRowsBelow(1);
       // ws.Style.Font.FontColor = XLColor.Gray;
        ws.Columns("1-9").AdjustToContents();
        ws.Tables.Table(0).ShowAutoFilter = true;
        ws.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
        DynaGenExcelFile(fileName, page, xlsx);
    }


    /// <summary>
    /// Remove all HTML special characters from datatable field if they are present 
    /// </summary>
    /// <param name="dt"></param>
    private static void RemoveHtmlSpecialChars(DataTable dt)
    {
        for (int rows = 0; rows < dt.Rows.Count; rows++)
        {
            for (int column = 0; column < dt.Columns.Count; column++)
            {
                dt.Rows[rows][column] = dt.Rows[rows][column].ToString().Replace("&nbsp;", string.Empty);
            }
        }
    }

    /// <summary>
    /// Call this Method to Generate the Excel Files from different Lap Reports depending on which one has been selected
    /// </summary>
    /// <param name="fileName"></param>
    /// <param name="page"></param>
    /// <param name="xlsx"></param>
    private static void DynaGenExcelFile(string fileName, Page page, XLWorkbook xlsx)
    {
        page.Response.ClearContent();
        page.Response.ClearHeaders();
        page.Response.ContentType = "application/vnd.ms-excel";
        page.Response.AppendHeader("Content-Disposition", string.Format("attachment;filename={0}.xlsx", fileName));

        using (MemoryStream memoryStream = new MemoryStream())
        {
            xlsx.SaveAs(memoryStream);
            memoryStream.WriteTo(page.Response.OutputStream);
        }
        page.Response.Flush();
        page.Response.End();
    }   

}

Answer 4

与流行的看法相反，您可以将文件的扩展名设置为.html，Excel可以将其打开。

只需将扩展程序设置为HTML：

Response.AddHeader("content-disposition", "attachment;filename=GV.html");

并保留Excel作为内容类型：

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

编辑：哦，对，忘了提，这应该会让烦人的对话消失。

编辑2：看起来原来的问题已经改变了...现在它正在谈论使用ClosedXML ......但我会在这里留下这个答案，以防其他人使用HTML和Excel。

使用ClosedXML将Gridview导出到Excel而不发出警告：您尝试打开的文件格式不同

4 个答案: