在asp.net2.0中使用GridView的RenderContro将GridView中数据l转换成EXCEL文件

在asp.net2.0中，控件的校验严格了，RenderControl代码只有走正常流程在render方法中它自己调用才能成功，在你自己写的事件方法中调用就会出现这个错误。这个错误信息有点误导，你明明写在服务器控件Form内，它照样会这样提醒你，实际上是asp.net2.0设置了内部变量控制RenderControl不允许在Render方法之外被轻易调用。

但只要稍做修改就可以实现在asp.net2.0中使用GridView的RenderContro将GridView中数据l转换成EXCEL文件的功能了。

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

</head>

<body>

<div>

<asp:GridView ID="GridView1" runat="server">

</asp:GridView>

<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="输出" Width="71px" /> </div>

</form>

</body>

</html>

注意最后两个函数

protected void Page_Load(object sender, EventArgs e)

{

// 在此处放置用户代码以初始化页面

if (!Page.IsPostBack)

BindData();

}

/// <summary>

/// 创建数据源

/// </summary>

/// <returns>DataView</returns>

ICollection CreateDataSource()

{

DataTable dt = new DataTable();

DataRow dr;

dt.Columns.Add(new DataColumn("身份证号码", typeof(string)));

dt.Columns.Add(new DataColumn("图书单价", typeof(decimal)));

dt.Columns.Add(new DataColumn("购买数量", typeof(Int32)));

dt.Columns.Add(new DataColumn("总价格", typeof(decimal)));

for (int i = 0; i < 30; i++)

{

dr = dt.NewRow();

dr[0] = "123456789123456789";

dr[1] = 100 * i / 3.0;

dr[2] = i + 5;

dr[3] = (decimal)dr[1] * (Int32)dr[2];

dt.Rows.Add(dr);

}

DataView dv = new DataView(dt);

return dv;

}

private void BindData()

{

GridView1.DataSource = CreateDataSource();

GridView1.DataBind();

}

protected void Button1_Click(object sender, EventArgs e)

{

Response.Clear();

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

Response.Charset = "gb2312";

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

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

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

GridView1.AllowPaging = false;

BindData();

GridView1.RenderControl(htmlWrite);

Response.Write(stringWrite.ToString());

Response.End();

GridView1.AllowPaging = true;

BindData();

}

public override void VerifyRenderingInServerForm(Control control)

{

// Confirms that an HtmlForm control is rendered for

}

protected void paging(object sender, GridViewPageEventArgs e)

{

GridView1.PageIndex = e.NewPageIndex;

BindData();

}