asp.net 图片上传

 protected void Button1_Click(object sender, EventArgs e)
    {
      
        string fullName = this.File1.PostedFile.FileName;//获取上传文件的全路径
        string size = this.File1.PostedFile.ContentLength.ToString();//获取文件上传的大小
        string fileName = fullName.Substring(fullName.LastIndexOf("\\")+1);   //获取上传文件的文件名
        string type = fullName.Substring(fullName.LastIndexOf(".")+1);//获取文件上传格式
        if (type == "jpg" || type == "bmp" || type == "gif" || type == "ico")
        {
            this.File1.PostedFile.SaveAs(Server.MapPath("upload") + "\\" + fileName);//将图片上传到该项目中的upload文件夹下
            this.Imp.Visible = true;
            this.Imp.ImageUrl = "upload/" + fileName;//显示图片
        }
        else
        {
            Response.Write("<script language='javascript'>alert('你上传的图片格式有错误！')</script>");
        }
}