ASP.NET FileUpload 上传图片实例

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Add a FileUpload control to the aspx page

Add to code behind cs file

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; } }}

The default size of files uploaded by the FileUpload control is 4MB. This solution was found from the Internet。

值得注意的是，FileUpload 默认上传文件最大为4MB。这是在网上找到的。

如果要增加，则可以在Machine.config里面进行修改