ASP.NETFileUpload上传图片实例

Text="Upload" />    COntrolToValidate="FileUpload1" Display="Static" ErrorMessage="You should only can upload image file such as files with .jpg or gif extension" OnServerValidate="Image_validate">*

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;
using System.IO;
using System.Drawing;
public partial class practice_FileUpload : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btn_upload_Click(object sender, EventArgs e)
{
if (Page.IsValid)
{
string path = @Page.MapPath("User_Edit.aspx").Replace("User_Edit.aspx", "") + "Documents\\";
string s = path + Session["UserName"].ToString();
if (!System.IO.Directory.Exists(path + Session["UserName"].ToString()))
{
System.IO.Directory.CreateDirectory(path + Session["UserName"].ToString());
}
if (FileUpload1.HasFile)
{
FileUpload1.SaveAs(Server.MapPath("~/Seeker/Documents/" + Session["UserName"].ToString() + "/" + this.FileUpload1.FileName));
}
}
}
protected void Image_validate(object source, ServerValidateEventArgs args)
{
string fileExt = Path.GetExtension(FileUpload1.FileName).ToLower();
string fileName = Path.GetFileName(FileUpload1.FileName);
if (fileExt != ".jpg" && fileExt != ".gif")
{
args.IsValid = false;
}
}
protected void CustomValidator2_ServerValidate(object source, ServerValidateEventArgs args)
{
Bitmap bmIP = new Bitmap(FileUpload1.PostedFile.InputStream);
if (bmIP.Width > 100 | bmIP.Height > 100)
{
args.IsValid = false;
}
else
{
args.IsValid = true;
}
}
}