在我们把DataGrid上的数据导入到Excel的时候，如果遇到比较长的数字字符串，比如身份证号码，就会在Excel里当成数字看待，并转换成科学计数法的格式，造成数据的丢失，下面这个方法就解决了这个问题，并示例如何进行其它的格式化。
查看例子
OutPutExcel.aspx
OutPutExcelOutPutExcel.aspx.cs
using System; using System.Collections; using System.ComponentModel; using System.Data; using System.Drawing; using System.Web; using System.Web.SessionState; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.HtmlControls; namespace eMeng.Exam { /// /// OutPutExcel 的摘要说明。 /// public class OutPutExcel : System.Web.UI.Page { protected System.Web.UI.WebControls.Button Button1; protected System.Web.UI.WebControls.DataGrid DataGrid1; private void Page_Load(object sender, System.EventArgs e) { // 在此处放置用户代码以初始化页面 DataGrid1.DataSource=CreateDataSource(); DataGrid1.DataBind(); } /// /// 创建数据源 /// /// DataView 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; } /// /// 输出到Excel /// //////
private void Button1_Click(object sender, System.EventArgs e) { Response.Clear(); Response.Buffer= true; Response.Charset="GB2312"; Response.AppendHeader("Content-Disposition","attachment;filename=FileName.xls"); Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文 Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。 this.EnableViewState = false; System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN",true); System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad); System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter); this.DataGrid1.RenderControl(oHtmlTextWriter); Response.Write(oStringWriter.ToString()); Response.End(); } #region Web 窗体设计器生成的代码 override protected void OnInit(EventArgs e) { // // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。 // InitializeComponent(); base.OnInit(e); } /// /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// private void InitializeComponent() { this.Button1.Click += new System.EventHandler(this.Button1_Click); this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound); this.Load += new System.EventHandler(this.Page_Load); } #endregion private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e) { if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) { e.Item.Cells[0].Attributes.Add("style","vnd.ms-excel.numberformat:@"); e.Item.Cells[3].Attributes.Add("style","vnd.ms-excel.numberformat:￥#,###.00"); } } } }
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