数据导出到Excel/Word 防止出现乱码仅有一行数据导出的时候

1、页面中添加绿色字体代码
<%@ Page Language="C#" CodeFile="111.aspx.cs" Inherits="111" EnableEventValidation="false" %>
2、类文件中的方法

/// <summary>
/// 导出excel按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void lbToExcel_Click(object sender, EventArgs e)
{
//注：gvData为Gridview控件的名称
gvData.AllowPaging = false;
gvData.DataBind();
//导出文件的文件名
var fileName = string.Format("{0:yyyyMMddHHmmss}", DateTime.Now);
//导出的具体实现逻辑
ExportControl(gvData, "Excel", fileName);
gvData.AllowPaging = true;
gvData.Columns[0].Visible = true;
}

/// <summary>
/// 将Web控件或页面信息导出(带文件名参数)
/// </summary>
/// <param name="source">控件实例</param>
/// <param name="DocumentType">导出类型:Excel或Word</param>
/// <param name="filename">保存文件名</param>
public void ExportControl(System.Web.UI.Control source, string DocumentType, string filename)
{
//设置Http的头信息,编码格式
if (DocumentType == "Excel")
{
//防止出现乱码,加上这行可以防止在只有一行数据时出现乱码


HttpContext.Current.Response.Write("<meta http-equiv=Content-Type content=text/html;charset=UTF-8>");
//Excel
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename + ".xls", System.Text.Encoding.UTF8));
HttpContext.Current.Response.ContentType = "application/ms-excel";
}
else if (DocumentType == "Word")
{
//防止出现乱码,加上这行可以防止在只有一行数据时出现乱码


HttpContext.Current.Response.Write("<meta http-equiv=Content-Type content=text/html;charset=UTF-8>");
//Word
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(filename + ".doc", System.Text.Encoding.UTF8));
HttpContext.Current.Response.ContentType = "application/ms-word";
}

HttpContext.Current.Response.Charset = "UTF-8";
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;

//关闭控件的视图状态
source.Page.EnableViewState = false;

//初始化HtmlWriter
System.IO.StringWriter writer = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWriter = new System.Web.UI.HtmlTextWriter(writer);
source.RenderControl(htmlWriter);

//输出
HttpContext.Current.Response.Write(writer.ToString());
HttpContext.Current.Response.End();
}

//重写一个方法，必须加上次方法
public override void VerifyRenderingInServerForm(Control control)
{
//base.VerifyRenderingInServerForm(control);
}