将 GridView 导出到 excel #2答案

【问题标题】：export GridView to excel #2将 GridView 导出到 excel #2
【发布时间】：2011-10-30 07:49:35
【问题描述】：

我将 GridView 绑定到 sqldatasource，然后在 _rowcreated 事件上进行一些验证，当行不符合要求时，我使用 e.Row.Visible = false 隐藏它；

这很好用，并且只在 gridview 中显示正确的行。现在我有一个按钮可以导出到 excel，除了导出隐藏的行之外，它的效果很好。我不想导出隐藏的行。

有没有一种方法可以告诉 gridview 不要添加该行而不是隐藏它？在我运行导出之前，有没有一种简单的方法可以删除所有隐藏的行？我可以在导出期间不添加隐藏行吗？正如您在下面的代码中看到的那样，我尝试执行此操作，但它无法识别该行是否可见。

导出代码：

 public static void Export(string fileName, GridView gv)
{
    HttpContext.Current.Response.Clear();
    HttpContext.Current.Response.AddHeader(
        "content-disposition", string.Format("attachment; filename={0}", fileName));
    HttpContext.Current.Response.ContentType = "application/ms-excel";

    using (StringWriter sw = new StringWriter())
    {
        using (HtmlTextWriter htw = new HtmlTextWriter(sw))
        {
            //  Create a form to contain the grid
            Table table = new Table();

            gv.GridLines = GridLines.Both;
            table.GridLines = gv.GridLines;
            //table.BackColor = Color.Yellow;



            //  add the header row to the table
            if (gv.HeaderRow != null)
            {
                GridViewExportUtil.PrepareControlForExport(gv.HeaderRow);
                table.Rows.Add(gv.HeaderRow);

                //color the header
                table.Rows[0].BackColor = gv.HeaderStyle.BackColor;
                table.Rows[0].ForeColor = gv.HeaderStyle.ForeColor;
            }

            //  add each of the data rows to the table
            foreach (GridViewRow row in gv.Rows)
            {

                if (row.Visible == true)
                {
                    GridViewExportUtil.PrepareControlForExport(row);
                    table.Rows.Add(row);
                }
            }

            //  color the rows
            bool altColor = false;
            for (int i = 1; i < table.Rows.Count; i++)
            {
                if (!altColor)
                {
                    table.Rows[i].BackColor = gv.RowStyle.BackColor;
                    altColor = true;
                }
                else
                {
                    table.Rows[i].BackColor = gv.AlternatingRowStyle.BackColor;
                    altColor = false;
                }
            }

            //  render the table into the htmlwriter
            table.RenderControl(htw);

            //  render the htmlwriter into the response
            HttpContext.Current.Response.Write(sw.ToString());
            HttpContext.Current.Response.End();
        }
    }
}

【问题讨论】：

为什么一开始有隐藏行？只获取你想要显示的数据。
几乎所有的答案都在这里写一个（HtmlTextWriter）字符串或有互操作代码。两者都不要使用。这将导致您稍后在 DateTime 和 Decimal 格式方面出现问题。 Excel 也会发出警告，因为您生成的不是“真正的”Excel 文件，而是扩展名为 .xls 的 HTML 页面。开始使用专门的库来创建 Excel 文件，例如 EPPlus。 Example here 和 here.

标签： c# asp.net excel gridview export

【解决方案1】：

http://mattberseth.com/blog/2007/04/export_gridview_to_excel_1.html

我没用过GridViewExportUtil，为什么不编辑他的代码呢？

private static void PrepareControlForExport(Control control)
{
    for (int i = 0; i < control.Controls.Count; i++)
    {
        Control current = control.Controls[i];

        //-----------------------------
        // * my addition
        if (!current.Visible) continue;
        //-----------------------------

        if (current is LinkButton)
        {
            control.Controls.Remove(current);
            control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text));
        }
        else if (current is ImageButton)
        {
            //...

【讨论】：

【解决方案2】：

这里是导出 GridView 到 Excel 的简单实现：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient; 

public partial class ExportGridView : System.Web.UI.Page
{
    protected void Button1_Click(object sender, EventArgs e)
    {
        Response.Clear();

        Response.AddHeader("content-disposition", "attachment;
        filename=FileName.xls");

        Response.Charset = "";

        // If you want the option to open the Excel file without saving than

        // comment out the line below

        // Response.Cache.SetCacheability(HttpCacheability.NoCache);

        Response.ContentType = "application/vnd.xls";

        System.IO.StringWriter stringWrite = new System.IO.StringWriter();

        System.Web.UI.HtmlTextWriter htmlWrite =
        new HtmlTextWriter(stringWrite);

        GridView1.RenderControl(htmlWrite);

        Response.Write(stringWrite.ToString());

        Response.End();

    }
}

Reference blog

【讨论】：

【解决方案3】：

首先，为什么要从 gridview 中隐藏行？只获取您想要的数据。并使用此方法导出；

void ExportToExcel(GridView grdData, string filename)
{
    grdData.BorderStyle = BorderStyle.Solid;
    grdData.BorderWidth = 1;
    grdData.BackColor = Color.WhiteSmoke;
    grdData.GridLines = GridLines.Both;
    grdData.Font.Name = "Verdana";
    grdData.Font.Size = FontUnit.XXSmall;
    grdData.HeaderStyle.BackColor = Color.DimGray;
    grdData.HeaderStyle.ForeColor = Color.White;
    grdData.RowStyle.HorizontalAlign = HorizontalAlign.Left;
    grdData.RowStyle.VerticalAlign = VerticalAlign.Top;

    HttpResponse response = HttpContext.Current.Response;
    response.Clear();
    response.Charset = "";
    response.ContentType = "application/vnd.ms-excel";
    response.AddHeader("Content-Disposition", "attachment;filename=\"" + filename+ "\"");

    using (var sw = new StringWriter())
    {
        using (var htw = new HtmlTextWriter(sw))
        {
            grdData.RenderControl(htw);
            response.Write(sw.ToString());
            response.End();
        }
    }
}

【讨论】：