Asp.net 2.0 用 FileUpload 控件实现多文件上传 用户控件(示例代码下载).NET技术

一、示例代码

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public partial class UpMultiFileControl2 : System.Web.UI.UserControl
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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if (!Page.IsPostBack)
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{
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SaveCurrentPageFileControls();
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}
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}
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protected void btAddFile_Click(object sender, EventArgs e)
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{
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AddOneFileControl();
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}
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/**//// <summary>
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/// 添加一个上传文件控件
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/// </summary>
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private void AddOneFileControl()
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{
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ArrayList al = new ArrayList();
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this.tbFiles.Rows.Clear();
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GetFileControlsFromSession();
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HtmlTableRow htr = new HtmlTableRow();
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HtmlTableCell htc = new HtmlTableCell();
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htc.Controls.Add(new FileUpload());
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htr.Controls.Add(htc);
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this.tbFiles.Rows.Add(htr);
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SaveCurrentPageFileControls();
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}
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/**//// <summary>
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/// 读取缓存中存储的上传文件控件集
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/// </summary>
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private void GetFileControlsFromSession()
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{
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ArrayList al = new ArrayList();
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if (Session["FilesControls"] != null)
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{
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al = (System.Collections.ArrayList)Session["FilesControls"];
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for (int i = 0; i < al.Count; i++)
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{
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HtmlTableRow htr1 = new HtmlTableRow();
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HtmlTableCell htc1 = new HtmlTableCell();
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htc1.Controls.Add((System.Web.UI.WebControls.FileUpload)al[i]);
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htr1.Controls.Add(htc1);
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this.tbFiles.Rows.Add(htr1);
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}
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}
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}
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/**//// <summary>
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/// 保存当前页面上传文件控件集到缓存中
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/// </summary>
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private void SaveCurrentPageFileControls()
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{
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ArrayList al = new ArrayList();
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foreach (Control controlTR in this.tbFiles.Controls)
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{
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if (controlTR.GetType().ToString() == "System.Web.UI.HtmlControls.HtmlTableRow")
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{
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HtmlTableCell htc = (HtmlTableCell)controlTR.Controls[0];
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foreach (Control controlFileUpload in htc.Controls)
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{
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if (controlFileUpload.GetType().ToString() == "System.Web.UI.WebControls.FileUpload")
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{
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FileUpload tempFileUpload = (FileUpload)controlFileUpload;
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al.Add(tempFileUpload);
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}
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}
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}
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}
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Session.Add("FilesControls", al);
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}
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protected void btUpFiles_Click(object sender, EventArgs e)
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{
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UpLoadFiles();
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}
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/**//// <summary>
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/// 上传文件操作
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/// </summary>
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private void UpLoadFiles()
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{
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string filepath = Server.MapPath("./")+"UploadFiles";
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HttpFileCollection uploadedFiles = Request.Files;
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for (int i = 0; i < uploadedFiles.Count; i++)
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{
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HttpPostedFile userPostedFile = uploadedFiles[i];
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try
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{
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if (userPostedFile.ContentLength > 0 )
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{
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userPostedFile.SaveAs(filepath + "/" + System.IO.Path.GetFileName(userPostedFile.FileName));
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Response.Write("已上传文件: "" + filepath +"/"+ userPostedFile.FileName +""<br><br>" );
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}
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}
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catch
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{
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Response.Write("上传文件: "" + userPostedFile.FileName +""出错!");
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}
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}
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if (Session["FilesControls"] != null)
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{
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Session.Remove("FilesControls");
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}
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}
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}
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二、改变上传文件大小和时间限制
<httpRuntime>
executionTimeout="110" //上传等待时间
maxRequestLength="4096" //上传文件大小,默认为4M
</httpRuntime>

上传文件大小是由上面两个参数所决定的. 涉及到安全因素,不要设得太大.

转自:http://www.cnblogs.com/huashanlin/archive/2006/08/24/484849.html