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： 

/*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：

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); 
            } 
        } 
        /// <summary> 
        /// 上传图片 
        /// </summary> 
        /// <param name="hc"></param> 
        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