由於Excel畢竟不是 HTML，它有自己的樣式標準，在Excel 中，實現換行的方法是：
- <br style='mso-data-placement:same-cell;'/>
完整代碼：
- <%@ 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用於導出並返回excel文件
- System.IO.StringWriter strWriter = null;
- System.Web.UI.HtmlTextWriter htmlWriter = null;
- // 設置編碼和附件格式
- 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 = "";
- // 導出excel文件
- strWriter = new System.IO.StringWriter();
- htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);
- htmlWriter.WriteLine("標題");
- // 返回客戶端
- 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("學生班級", typeof(System.String)));
- dt.Columns.Add(new System.Data.DataColumn("學生姓名", typeof(System.String)));
- dt.Columns.Add(new System.Data.DataColumn("語文", typeof(System.Decimal)));
- dt.Columns.Add(new System.Data.DataColumn("數學", typeof(System.Decimal)));
- dt.Columns.Add(new System.Data.DataColumn("英語", typeof(System.Decimal)));
- dt.Columns.Add(new System.Data.DataColumn("計算機", typeof(System.Decimal)));
- for (int i = 0; i < 8; i++)
- {
- System.Random rd = new System.Random(Environment.TickCount * i); ;
- dr = dt.NewRow();
- dr[0] = "班級" + i.ToString();
- dr[1] = "學生姓名：孟子E章" + i.ToString() + "<br/>所在班級：" + "班級" + 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>無標題頁</title>
- </head>
- <body>
- <form id="form1" runat="server">
- <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
- <Columns>
- <asp:BoundField HtmlEncode="false" DataField="學生姓名" HeaderText="測試字段" />
- </Columns>
- </asp:GridView>
- <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
- </form>
- </body>
- </html>
要查閱 Excel 中使用的樣式規範，請參考：Microsoft® Office HTML and XML Reference。下載地址：
http://download.microsoft.com/download/a/c/1/ac18e8a2-ce20-41b5-8407-c4cec4a17f19/ofhtml9.exe