【下载文档:  asp.net+ajaxfileupload.js 实现文件异步上传代码分享.txt 】

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asp.net+ajaxfileupload.js 实现文件异步上传代码分享
由于代码很简单，这里就闲话不多说了，直接上代码，小伙伴们自己研读代码就明白了。
前台代码：
复制代码 代码如下:
/*修改头像*/
//上传
function _sc() {
$(".ckfile").html("").css("color", "#535353");
$("#_userImgPath").val("");
var str = $("#file").val();
if ($.trim(str) == "") {
$(".ckfile").html("请选择文件。").css("color", "red");
return false;
}
else {
var postfix = str.substring(str.lastIndexOf(".") + 1).toUpperCase();
if (postfix == "JPG" || postfix == "JPEG" || postfix == "PNG" || postfix == "GIF" || postfix == "BMP") {
$('#showimg').attr('src', 'Images/loading.gif').attr("title", "上传中，请稍后…");
var path = "Upload/UserImg";
$.ajaxFileUpload({
url: '/Upload.aspx?path=Upload|UserImg&shape=100*100',
secureuri: false,
fileElementId: 'file',
dataType: 'text',
success: function (msg) {
if (msg.lastIndexOf(path) == -1) {
$(".ckfile").html(msg).css("color", "red");
}
else {
$('#showimg').attr('src', msg).attr("title", "我的头像");
$("#_userImgPath").val(msg);
}
}
});
} else {
$(".ckfile").html("文件格式错误。").css("color", "red");
return false;
}
}
}
后台代码：
复制代码 代码如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using SS.Upload;
using WFC.Fenxiao;
namespace wanfangcheng
{
public partial class Upload : BasePage
{
//文件大小 1024 kb
private long size = 1024;
//文件类型
private string type = ".jpg|.jpeg|.png|.gif|.bmp";
//保存名称
string name = "";
//保存路径
private string path = @"Upload/UserImg";
//保存大小
private string shape = "100*100";
protected void Page_Load(object sender, EventArgs e)
{
HttpFileCollection files = Request.Files;
if (files != null && files.Count > 0)
{
name = BaseRole.Instance.UserId.ToString();
if (Request.QueryString["size"] != null)
{
size = Convert.ToInt32(Request.QueryString["size"]);
}
if (Request.QueryString["path"] != null)
{
path = Request.QueryString["path"].ToString().Trim().Replace('|', '/');
}
if (Request.QueryString["name"] != null)
{
name = Request.QueryString["name"].ToString().Trim();
}
if (Request.QueryString["shape"] != null)
{
shape = Request.QueryString["shape"].ToString().Trim();
}
uploadMethod(files);
}
}
///

/// 上传图片
///

///
public void uploadMethod(HttpFileCollection hc)
{
HttpPostedFile _file = hc[0];
//文件大小
long _size = _file.ContentLength;
if (_size <= 0)
{
Response.Write("文件错误。");
Response.End();
return;
}
if (size * 1024 < _size)
{
Response.Write("文件过大,最大限制为" + size + "KB。");
Response.End();
return;
}
//文件名
string _name = _file.FileName;
//文件格式
string _tp = System.IO.Path.GetExtension(_name).ToLower();
if (type.IndexOf(_tp) == -1)
{
Response.Write("文件格式错误。");
Response.End();
return;
}
//保存路径
string _path = HttpContext.Current.Server.MapPath(path) + @"/" + name + _tp;
try
{
int w = Convert.ToInt32(shape.Split('*')[0]);
int h = Convert.ToInt32(shape.Split('*')[1]);
ImageHelper.CutForCustom(_file, _path, w, h, 50);
Response.Write(path + @"/" + name + _tp);
}
catch (Exception)
{
Response.Write("哎呦，出错了。");
Response.End();
}
}
}
}
是不是很实用，也很简单易懂呢，以上是自己项目中使用的代码，小伙伴们如果发现有问题的地方，还请告之。谢谢