由于Excel毕竟不是 HTML，它有自己的样式标准，在Excel 中，实现换行的方法是：
<![CDATA[
<br style='mso-data-placement:same-cell;'/>
]]>
完整代码：
<![CDATA[
<%@ Page Language="C#" Trace="false" AutoEventWireup="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void Button1_Click(object sender, EventArgs e)
{
System.Web.HttpContext curContext = System.Web.HttpContext.Current;
// IO用于导出并返回excel文件
System.IO.StringWriter strWriter = null;
System.Web.UI.HtmlTextWriter htmlWriter = null;
// 设置编码和附件格式
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Buffer = true;
HttpContext.Current.Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "aaa.xls"));
curContext.Response.ContentType = "application/vnd.ms-excel";
curContext.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB18030");
curContext.Response.Charset = "";
// 导出excel文件
strWriter = new System.IO.StringWriter();
htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);
htmlWriter.WriteLine("标题");
// 返回客户端
GridView1.RenderControl(htmlWriter);
curContext.Response.Write(strWriter.ToString().Replace("<br/>", "<br style='mso-data-placement:same-cell;'/> "));
curContext.Response.End();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
GridView1.DataSource = CreateDataSourceByXianhuiMeng();
GridView1.DataBind();
}
}
System.Data.DataView CreateDataSourceByXianhuiMeng()
{
System.Data.DataTable dt = new System.Data.DataTable();
System.Data.DataRow dr;
dt.Columns.Add(new System.Data.DataColumn("学生班级", typeof(System.String)));
dt.Columns.Add(new System.Data.DataColumn("学生姓名", typeof(System.String)));
dt.Columns.Add(new System.Data.DataColumn("语文", typeof(System.Decimal)));
dt.Columns.Add(new System.Data.DataColumn("数学", typeof(System.Decimal)));
dt.Columns.Add(new System.Data.DataColumn("英语", typeof(System.Decimal)));
dt.Columns.Add(new System.Data.DataColumn("计算机", typeof(System.Decimal)));
for (int i = 0; i < 8; i++)
{
System.Random rd = new System.Random(Environment.TickCount * i); ;
dr = dt.NewRow();
dr[0] = "班级" + i.ToString();
dr[1] = "学生姓名：孟子E章" + i.ToString() + "<br/>所在班级：" + "班级" + i.ToString();
dr[2] = System.Math.Round(rd.NextDouble() * 100, 2);
dr[3] = System.Math.Round(rd.NextDouble() * 100, 2);
dr[4] = System.Math.Round(rd.NextDouble() * 100, 2);
dr[5] = System.Math.Round(rd.NextDouble() * 100, 2);
dt.Rows.Add(dr);
}
System.Data.DataView dv = new System.Data.DataView(dt);
return dv;
}
public override void VerifyRenderingInServerForm(Control control)
{ }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:BoundField HtmlEncode="false" DataField="学生姓名" HeaderText="测试字段" />
</Columns>
</asp:GridView>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</form>
</body>
</html>
]]>
要查阅 Excel 中使用的样式规范，请参考：Microsoft® Office HTML and XML Reference。下载地址：http://download.microsoft.com/download/a/c/1/ac18e8a2-ce20-41b5-8407-c4cec4a17f19/ofhtml9.exe
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