【发布时间】：2023-03-25 20:02:01
【问题描述】：
在我的 C# 应用程序中，我从用户的输入生成一个 Gridview，然后我必须为用户提供一个将 Gridview 导出到 Excel 工作表的选项。
这是我的 abc.aspx 页面：
<body>
<form id="form1" runat="server">
<div>
<b>Enter p1 :</b>
<asp:TextBox ID="tb_P1" runat="server" />
<br />
<b>Enter p2 :</b>
<asp:TextBox ID="tb_P2" runat="server" /><br />
<asp:Button ID="btn1" runat="server" OnClick="Button1_Click" Text="Start Search" ClientIDMode="Static" />
<asp:Button ID="btn2" runat="server" OnClick="Button2_Click" Text="Export Data to Excel" />
<hr />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="true"
ShowFooter="false"
AllowSorting="true"
OnSorting="GridView1_Sorting"
EnableViewState="false"
ShowHeaderWhenEmpty="True"
AllowPaging="false">
<RowStyle Wrap="false" />
<HeaderStyle Wrap="false" />
</asp:GridView>
</div>
</form>
<br />
</body>
这是我的 .cs 页面：
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using System.Web.Script.Services;
using System.Configuration;
using System.Drawing;
using System.Windows.Forms;
using System.ComponentModel;
using System.IO;
public partial class pSearch : System.Web.UI.Page
{
SqlConnection sqlconn = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["DBConnectionString"].ConnectionString);
DataSet dsldata;
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button2_Click(object sender, EventArgs e)
{
string fname = filename.Text;
GridView1.DataSource = (DataSet)Session["data"];
GridView1.DataBind();
int rowCount = GridView1.Rows.Count;
if (rowCount == 0)
{
Response.Write("<script>alert('Result Empty!');</script>");
}
else
{
ExportToExcel(GridView1, fname);
}
}
private void ExportToExcel(GridView GrdView, string fname)
{
try
{
Response.AddHeader("contentdisposition", "attachment;filename=test1.xls");
Response.Charset = "";
Response.ContentType = "application/vnd.xls";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);
GrdView.RenderControl(htmlWrite);
Response.Write(stringWrite.ToString());
Response.End();
}
catch (Exception ex)
{
Response.Write("<script>alert('" + ex.Message + "')</script>");
}
}
public override void VerifyRenderingInServerForm(System.Web.UI.Control control)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
string Rname= Page.Request.QueryString["rname"];
string typeofquery = "my command";
string abc = null;
abc = "" + typeofquery + " @RName='" + RName "'";
SqlDataAdapter cmdldata = new SqlDataAdapter(abc, sqlconn);
cmdldata.SelectCommand.CommandTimeout = 600;
dsldata = new DataSet();
try
{
cmdldata.Fill(dsldata);
Session["data"] = dsldata;
GridView1.DataSource = dsldata;
GridView1.DataBind();
}//end of try
catch (Exception ex)
{
Response.Write(ex);
}//end of catch
}
private const string ASCENDING = " ASC";
private const string DESCENDING = " DESC";
public SortDirection GridViewSortDirection
{
get
{
if (ViewState["sortDirection"] == null)
ViewState["sortDirection"] = SortDirection.Ascending;
return (SortDirection)ViewState["sortDirection"];
}
set { ViewState["sortDirection"] = value; }
}
protected void GridView1_Sorting(object sender, GridViewSortEventArgs e)
{
string sortExpression = e.SortExpression;
if (GridViewSortDirection == SortDirection.Ascending)
{
GridViewSortDirection = SortDirection.Descending;
SortGridView(sortExpression, DESCENDING);
}
else
{
GridViewSortDirection = SortDirection.Ascending;
SortGridView(sortExpression, ASCENDING);
}
}
private void SortGridView(string sortExpression, string direction)
{
dsldata = (DataSet)HttpContext.Current.Session["data"];
DataTable dt = dsldata.Tables[0];
DataView dv = new DataView(dt);
dv.Sort = sortExpression + direction;
dt = dv.ToTable();
DataSet ds1 = new DataSet("table");
ds1.Tables.Add(dt);
Session["data"] = ds1;
GridView1.DataSource = dv;
GridView1.DataBind();
}
}
我在我的 gridview 中启用了排序。
问题是：我的整个网页正在导出到 Excel 表。我只想导出我的网格视图。排序工作正常，我在我的 excel 表中得到了新的排序表，但它与整个网页一起使用。
我已经在互联网上的不同地方寻找解决方案。似乎很多人都面临过这个问题。我也尝试过他们的解决方案，例如
更改 Response.ContentType = "application/vnd.xls";到
Response.ContentType = "应用程序/vnd.ms-excel";大多数其他解决方案都类似于我的 ExportToExcel() 函数。
自过去 2 天以来，我一直在研究这件事，但我的应用程序没有任何效果。
请帮忙！ 提前谢谢！
更改了我的 ExporttoExcel 函数
private void ExportToExcel(GridView GrdView, string fname)
{
try
{
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=" + fname + ".xls");
Response.Charset = "";
Response.ContentType = "application/vnd.ms-excel";
StringWriter stringWrite = new StringWriter();
HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
GridView1.RenderControl(htmlWrite);
Response.Write(stringWrite.ToString());
Response.End();
}
catch (Exception ex)
{
Response.Write("<script>alert('" + ex.Message + "')</script>");
}
}
【问题讨论】：
-
我刚刚意识到，当我在 abc.aspx 页面的 gridview 中删除 OnSorting="GridView1_Sorting" 和 AllowSorting="true" 时，我得到了只有 gridview 的 excel 表。只有当我启用这两个时，问题出现了。请帮忙！
标签： c# asp.net gridview export-to-excel gridview-sorting