FileUpLoad控件

 1.认识FileUpload控件：

 1  // 上传图片
 2       // TextBox2为上传图片的自定义文件名.
 3       protected   void  Button2_Click( object  sender, EventArgs e)
 4      {
 5           if  (FileUpload1.HasFile) // 判读是否有文件
 6          {
 7               string  filename  =  FileUpload1.FileName; // 得到文件在本地的路径，及全路径
 8               string  kzm  =  filename.Substring(filename.LastIndexOf ( " . " )); // 将扩展名存放到变量kzm中
 9               string  uploadfilename  =  Server.MapPath( " upload " )  + " // " + TextBox2.Text + kzm; // 得到文件在服务器上的路径和文件名和扩展名。
10               if  ( ! kzm.Equals( " .jpg " ) &&  kzm  !=   " .JPG " )  // 判断扩展名
11                  Response.Write( " " );
12               if  (File.Exists(uploadfilename))          // 判断重名
13                  Response.Write( " " );
14               else
15              {
16                   try
17                  {
18                      FileUpload1.SaveAs(uploadfilename); // 将文件上传到服务器上。
19                      Image1.ImageUrl  =   " upload// "   +  TextBox2.Text  +  kzm; // 图片路径为刚才上传的文件
20                      Image1.Height  =   300 ; // 控制图片的大小
21                      Image1.Width  = 250 ;
22                  }
23                   catch (Exception ex)
24                  {
25                       Response .Write ( " " );
26                  }
27              }
28          }
29           else
30          {
31              Response.Write( " " );
32       
33          }
34      }

 

2. 下面的代码为在客户端书写对于上传控件文本格式的验证方法：

<% @ Page Language = " C# "  AutoEventWireup = " true "  CodeFile = " Upload.aspx.cs "  Inherits = " Upload "   %>

DOCTYPE html PUBLIC  " -//W3C//DTD XHTML 1.0 Transitional//EN "   " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " >

< html xmlns = " http://www.w3.org/1999/xhtml "   >
< head runat = " server " >
     < title > Asp.net文件上传时的客户端简单验证 title >
    
< script language = " javascript "   >
function checkmes(id)
{
   var filename  =  document.getElementById(id).value;
    // 验证是否选择文件
    if (filename == "" )
   {
     alert( " 请选择一个文件！ " );
      return   false ;
   }
   
    // 验证扩展名
   var ex  =  filename.substring(filename.length - 4 );
    if (ex != " .xls " )
   {
      alert( " 你选择的文件类型不正确，请选择一个Excel文件! " );
       return   false ;
   }
   
    // 最后提示信息
    return  confirm( " 你确定要上传此Excel文件？ " );
}
script >

head >
< body >
     < form id = " form1 "  runat = " server " >
     < div >
         < strong > Asp.net文件上传时的客户端简单验证 < br  />
             < br  />
             < asp:FileUpload ID = " fu_Excel "  runat = " server "  Width = " 300px "   />& nbsp;
             < asp:Button ID = " btn_Upload "  runat = " server "  Text = " 上 传 "  OnClick = " btn_Upload_Click "   />& nbsp; strong > div >
     form >
body >
html >

3. 在CS文件进行调用验证脚本的方法如下：

using  System;
using  System.Data;
using  System.Configuration;
using  System.Collections;
using  System.Web;
using  System.Web.Security;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.WebControls.WebParts;
using  System.Web.UI.HtmlControls;

public   partial   class  Upload : System.Web.UI.Page
{
     protected   void  Page_Load( object  sender, EventArgs e)
   {
        btn_Upload.Attributes.Add( " onclick " ,  " javascript:return checkmes(' "   +  fu_Excel.ClientID  +   " '); " );
    }

     protected   void  btn_Upload_Click( object  sender, EventArgs e)
  {
         // 上传文件的服务器端代码
    }
}

 

4. 对于上传文件的验证方式还可以采用ASP.Net中的验证控件，如下便是对于照片格式的验证方式。

 

  < asp:FileUpload ID = " FileUpload1 "  runat = " server "   />
                                  < asp:RegularExpressionValidator   
id = " FileUpLoadValidator "  runat = " server "    
ErrorMessage = " 上传图片只能为.jpg或.gif "    
ValidationExpression = " ^([a-zA-Z]://)[0-9a-zA-Z/u4e00-/u9fa5/w/s//!@#/$%^&/*/(/)_/+/-=/[/]{};'/,/.]*(.jpg|.JPG|.gif|.GIF|.bmp|.BMP)$ "    

ControlToValidate = " FileUpload1 " > asp:RegularExpressionValidator >

 

5.

如果想改变上传文件的大小限制，要在config文件中，在   节点内加入如下节点及其属性

  
批量上传：

批量
 1 protected   void  Button3_Click( object  sender, EventArgs e)
 2      {
 3         HttpFileCollection fileuploadControls  =  Request.Files;
 4          for  ( int  i  =   0 ; i  <  fileuploadControls.Count; i ++ )
 5          {
 6             HttpPostedFile fileuploadcontrol  =  fileuploadControls[i];
 7              if  (fileuploadControls[i].ContentLength  >   0 )
 8              {
 9                  try
10                  {
11                     fileuploadcontrol.SaveAs(Server.MapPath( " upload " )  + " // " + Path.GetFileName( fileuploadControls[i].FileName));
12                 }
13                  catch  (Exception ex)
14                  {
15                     Response.Write( " " );
16                 }
17             }
18         }
19         Response.Write( " " );
20     }
21 6.限制图片大小

if(!canUpload) return;
            lblResult.Text = "";
            //判断文件大小400*400
            string name = updFile.FileName;
            string filetype = name.Substring(name.LastIndexOf(".") + 1).ToString();
            if ((String.Compare(filetype, "jpg", true) == 0) || (String.Compare(filetype, "png", true) == 0) || (String.Compare(filetype, "bmp", true) == 0) || (String.Compare(filetype, "jpeg", true) == 0) || (String.Compare(filetype, "tif", true) == 0) || (String.Compare(filetype, "tiff", true) == 0) || (String.Compare(filetype, "gif", true) == 0))
            {
                System.Drawing.Image img = System.Drawing.Image.FromStream(updFile.PostedFile.InputStream);
                int height = img.Height;
                int width = img.Width;
                if ((height > 400) || (width > 400))
                {
                    lblResult.CssClass = "resulterror";
                    lblResult.Text = Resources.Messages.PictureViod;
                    return;
                }
            }