mywebcontrols.cs

asp做的新闻系统

  using System.Drawing; 
  using System.Web.UI.HtmlControls; 
  using System.Web.UI.WebControls; 
  using System; 
  namespace My 
  { 
   public class FileUpLoad : Panel 
   { 
   private HtmlInputFile htmlInputFile; 
   private Button button; 
   private Label label; 
   public FileUpLoad() : base() 
   { 
   htmlInputFile=new HtmlInputFile(); 
   button=new Button(); 
   button.Text="上传"; 
   button.Click+=new EventHandler(this.Button_Click); 
   label=new Label(); 
   label.Text="<font size=2>请选择上传文件的路径</font>"; 
   this.Controls.Add(htmlInputFile); 
   this.Controls.Add(button); 
   this.Controls.Add(label); 
   this.Width=450; 
   this.Height=30; 
   this.BorderStyle=BorderStyle.Dotted; 
   this.BorderWidth=1; 
   } 
   private void Button_Click(object sender, EventArgs e) 
   { 
   System.Web.HttpPostedFile postedFile=htmlInputFile.PostedFile; 
   if(postedFile!=null) 
   { 
   try{ 
   string fileName=PathToName(postedFile.FileName); 
   if(!fileName.EndsWith(Extension)) 
   {label.Text="You must select "+Extension+" file!"; return;} 
   if(postedFile.ContentLength>int.Parse(FileLength)) 
   {label.Text="File too big!";return;} 
   postedFile.SaveAs(SavePath+fileName); 
   label.Text="Upload File Successfully!"; 
   return; 
   }catch(System.Exception exc){label.Text=exc.Message;return;} 
   } 
   label.Text="Please select a file to upload!"; 
   return; 
   } 
   private string savePath=""; 
   private string extension=""; 
   private string fileLength="0"; 
  //上传的文件保存在服务器上的位置默认为c:\ 这些属性一般都是在ASP.NET的标记中设置也可以在codebehind中设置

   public string SavePath 
   { 
   get 
   { 
   if(savePath!="") return savePath; 
   return "c:\\"; 
   } 
   set 
   { 
   savePath=value; 
   } 
   } 
  //上传文件的最大长度 单位k 默认为1k 
   public string FileLength 
   { 
   get 
   { 
   if(fileLength!="0") return fileLength; 
   return "1024"; 
   } 
   set 
   { 
   fileLength=(int.Parse(value)*1024).ToString(); 
   } 
   } 
  //上传文件的扩展名 默认为txt 
   public string Extension 
   { 
   get 
   { 
   if(extension!="") return extension; 
   return "txt"; 
   } 
   set 
   { 
   extension=value; 
   } 
   } 
   public string PathToName(string path) 
   { 
   int pos=path.LastIndexOf("\\"); 
   return path.Substring(pos+1); 
   } 
   } 
  }