一键导出Word和Excel文件的简单服务器控件

出于项目的需求，写了这样一个控件，使用起来很简单，只需要3句代码：

    exportExcel.FileType = TSCRMLiteWeb.SC.ExportFileType.Excel;
    exportExcel.ExportFileName = "currencyList";
    exportExcel.TargetControlID = "currencyContianer.gridCurrencyList";

需要说明的只有几点：

1.由于项目中所有需要导出内容的控件都是DataGrid，因此只针对对此控件的测试，满足需求先，其它就没有测试过了:)

2.属性ExportFileName不要扩展名，FileType属性指定以后，控件自身就会得到对应的扩展名了

3.如要绑定到GridView需要在页面的后台代码中加:
public override void VerifyRenderingInServerForm(Control control)
    {
    }
否则会报:
类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内.错误

4.最关键的地方就是TargetControlID，这是需要导出内容的服务器控件的“路径“，通常是DataGrid的ID值，如果你的DataGrid就直接在Page下面，那么TargetControlID的值就直接设为DataGrid的ID，如果DataGrid父亲控件不是Page，那么一直追朔到Page下的一级控件，比如上面的例子，currencyContainer就是一个Page下面的控件，gridCurrencyList的父亲控件是currencyContainer，他们之间用点号分开，看过代码后你就会知道是为什么了，就这些。这里是所有的代码:

using System; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; namespace TSCRMLiteWeb.SC { /// <summary> /// 导出Excel,Word等Office文件的LinkButton服务器控件 /// </summary> public class ExportButton : LinkButton { public ExportButton() { // // TODO: 在此处添加构造函数逻辑 // } protected override void OnClick(EventArgs e) { ExportButton_Click(); } /// <summary> /// 扩展名,在设置导出文件类型的时候同时设置 /// </summary> private string ExtensionType { get { if(ViewState["ExtensionType"] == null) return ".xls"; return (string)ViewState["ExtensionType"]; } set { ViewState["ExtensionType"] = value; } } /// <summary> /// 要导出内容的目标控件ID,如果目标控件的父亲控件不是Page,那么应该从Page下的该控件的根控件开始传入,格式是ParentControlID.ControlID.ControlID... /// </summary> public string TargetControlID { get { if(ViewState["TargetControlID"] == null) return String.Empty; return (string)ViewState["TargetControlID"]; } set { ViewState["TargetControlID"] = value; } } /// <summary> /// 文件类型 /// </summary> public ExportFileType FileType { get { if(ViewState["ExportFileType"] == null) return ExportFileType.Excel; return (ExportFileType)ViewState["ExportFileType"]; } set { ViewState["ExportFileType"] = value; switch(value) { case ExportFileType.Excel: this.ExtensionType = ".xls"; break; case ExportFileType.Word: this.ExtensionType = ".doc"; break; default: this.ExtensionType = ".xls"; break; } } } /// <summary> /// 导出的文件名 /// </summary> public string ExportFileName { get { if(ViewState["ExportFileName"] == null) return "ExportFile"; return (string)ViewState["ExportFileName"]; } set { ViewState["ExportFileName"] = value; } } protected override void Render(HtmlTextWriter writer) { if(Page != null) { Page.VerifyRenderingInServerForm(this); } this.CausesValidation = false; base.Render (writer); } private void ExportButton_Click() { //确保找到控件 Control c = AnalyseControlID(); if(c == null) return; HttpResponse response = HttpContext.Current.Response; response.Clear(); response.Buffer= true; response.ContentType = SetContentType(); response.AddHeader("Content-Disposition", "attachment; filename=" + ExportFileName + ExtensionType + ""); response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312"); response.Charset = "gb2312"; EnableViewState = false; System.IO.StringWriter oStringWriter = new System.IO.StringWriter(); System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter); ClearControls(c); c.RenderControl(oHtmlTextWriter); response.Write(oStringWriter.ToString()); response.End(); //ClearControls(c); } private string SetContentType() { string contentType = String.Empty; switch(FileType) { case ExportFileType.Excel: contentType = "application/vnd.ms-excel"; break; case ExportFileType.Word: contentType = "application/vnd.ms-word"; break; } return contentType; } private Control AnalyseControlID() { if(Page != null) { string[] controlIDArray = TargetControlID.Split('.'); Control c = Page.FindControl(controlIDArray[0]); // HttpContext.Current.Response.Write(controlIDArray.Length); for(int i = 1;i < controlIDArray.Length;i++) { HttpContext.Current.Response.Write(controlIDArray[i]); c = c.FindControl(controlIDArray[i]); } return c; } return null; } /// <summary> /// 清除可能产生回发的子控件变成文本控件,如果不这样做的话,调用RenderControl会产生错误 /// Reference:http://www.c-sharpcorner.com/Code/2003/Sept/ExportASPNetDataGridToExcel.asp /// </summary> /// <param name="control"></param> private void ClearControls(Control control) { for (int i=control.Controls.Count -1; i>=0; i--) { ClearControls(control.Controls[i]); } if(control is TableCell) { for(int j = 0 ;j < control.Controls.Count;j++) { if(! (control.Controls[j] is Label || control.Controls[j] is LiteralControl)) { Control c = control.Controls[j]; if(c.GetType().GetProperty("Text") != null) { LiteralControl literal = new LiteralControl(); literal.Text = c.GetType().GetProperty("Text").GetValue(c,null).ToString(); control.Controls.Add(literal); } control.Controls.Remove(c); } } } return; } } /// <summary> /// 导出的文件类型 /// </summary> public enum ExportFileType { Word = 1, Excel = 2 } }

ps:更新了一下代码，另外如果DataGrid中包含类似LinkButton这样的控件，绑定值的时候应该使用

&lt;asp:linkbutton Text='"&lt;%#databinder.eval(container,&#8220;columnname&#8220;)%&gt;"'&gt;&lt;/asp:linkbutton&gt;

,而不要使用

&lt;asp:linkbutton&gt;&lt;%#databinder.eval(container,&#8220;columnname&#8220;)%&gt;&lt;/asp:linkbutton&gt;

这样的形式，因为这样Text将不会被倒入Excel中