asp.net文件上传带进度条实现案例（多种风格）

 upload.aspx:

//限制大小 1M 
 protected void Page_Load2(object sender, EventArgs e) 
 { 
 if (this.IsPostBack) 
 { 
 UploadInfo uploadInfo = this.Session["UploadInfo"] as UploadInfo; 
 if (uploadInfo == null) 
 { 
 // 让父页面知道无法处理上传 
 const string js = "window.parent.onComplete('error', '无法上传文件。请刷新页面，然后再试一次);"; 
 ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", js, true); 
 } 
 else 
 { 
 // 让服务端知道我们还没有准备好.. 
 uploadInfo.IsReady = false; 
 
 // 上传验证 
 if (this.fileUpload.PostedFile != null && this.fileUpload.PostedFile.ContentLength > 0 
 
 && this.fileUpload.PostedFile.ContentLength < 1048576)// 限制1M 
 { 
 // 设置路径 
 string path = this.Server.MapPath(@"Uploads"); 
 string fileName = Path.GetFileName(this.fileUpload.PostedFile.FileName); 
 
 // 上传信息 
 uploadInfo.ContentLength = this.fileUpload.PostedFile.ContentLength; 
 uploadInfo.FileName = fileName; 
 uploadInfo.UploadedLength = 0; 
 
 //文件存在 初始化... 
 uploadInfo.IsReady = true; 
 
 //缓存 
 int bufferSize = 1; 
 byte[] buffer = new byte[bufferSize]; 
 
 // 保存字节 
 using (FileStream fs = new FileStream(Path.Combine(path, fileName), FileMode.Create)) 
 { 
 while (uploadInfo.UploadedLength < uploadInfo.ContentLength) 
 { 
 //从输入流放进缓冲区 
 int bytes = this.fileUpload.PostedFile.InputStream.Read(buffer, 0, bufferSize); 
 // 字节写入文件流 
 fs.Write(buffer, 0, bytes); 
 // 更新大小 
 uploadInfo.UploadedLength += bytes; 
 
 // 线程睡眠 上传就更慢 这样就可以看到进度条了 
 System.Threading.Thread.Sleep(100); 
 } 
 } 
 
 // 删除. 
 File.Delete(Path.Combine(path, fileName)); 
 
 // 让父页面知道已经处理上传完毕 
 const string js = "window.parent.onComplete('success', '{0} 已成功上传');"; 
 ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", string.Format(js, fileName), true); 
 } 
 else 
 { 
 if (this.fileUpload.PostedFile.ContentLength >= 1048576)//1M 
 { 
 const string js = "window.parent.onComplete('error', '超出上传文件限制大小，请重新选择');"; 
 ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", js, true); 
 } 
 else 
 { 
 const string js = "window.parent.onComplete('error', '上传文件出错');"; 
 ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", js, true); 
 } 
 } 
 uploadInfo.IsReady = false; 
 } 
 } 
 } 
 
 // 不限制大小 
 protected void Page_Load(object sender, EventArgs e) 
 { 
 if (this.IsPostBack) 
 { 
 UploadInfo uploadInfo = this.Session["UploadInfo"] as UploadInfo; 
 uploadInfo.IsReady = false; 
 if (this.fileUpload.PostedFile != null && this.fileUpload.PostedFile.ContentLength > 0) 
 { 
 string path = this.Server.MapPath(@"Uploads"); 
 string fileName = Path.GetFileName(this.fileUpload.PostedFile.FileName); 
 
 uploadInfo.ContentLength = this.fileUpload.PostedFile.ContentLength; 
 uploadInfo.FileName = fileName; 
 uploadInfo.UploadedLength = 0; 
 
 uploadInfo.IsReady = true; 
 
 int bufferSize = 1; 
 byte[] buffer = new byte[bufferSize]; 
 
 using (FileStream fs = new FileStream(Path.Combine(path, fileName), FileMode.Create)) 
 { 
 while (uploadInfo.UploadedLength < uploadInfo.ContentLength) 
 { 
 int bytes = this.fileUpload.PostedFile.InputStream.Read(buffer, 0, bufferSize); 
 fs.Write(buffer, 0, bytes); 
 uploadInfo.UploadedLength += bytes; 
 } 
 } 
 const string js = "window.parent.onComplete('success', '{0} 已成功上传');"; 
 ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", string.Format(js, fileName), true); 
 } 
 else 
 { 
 const string js = "window.parent.onComplete('error', '上传文件出错');"; 
 ScriptManager.RegisterStartupScript(this, typeof(upload_aspx), "progress", js, true); 
 } 
 uploadInfo.IsReady = false; 
 } 
 } 

 代码就不贴完了，直接上干货，亲，这可是免邮的哦！下载地址

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