c# 使用ajaxfileupload上传文件，通过一般处理程序（Handler）接收文件

约定不等于承诺〃 2022-05-19 04:00 330阅读 0赞

界面如下图：

![70][]HTML代码如下：

<html >
    <head >
        
        
        <script src="../../Content/js/jquery/jquery-1.4.2.min.js" type="text/javascript"></script>
        <script src="../../Content/js/ajaxfileupload.js" type="text/javascript"></script>
    </head>
    <body>
        <div>
            <div>
                <input type="file" id="fileExcel" name="fileExcel"  />
                <a onclick="ajaxFileUpload()" href="javascript:void(0);" >上传</a> 
            </div>
        </div>
    </body>
    <script type="text/javascript">
        function ajaxFileUpload() {
           try {
                $.ajaxFileUpload({
                    url: '../../AjaxHandler/SIMManage/SIMInfoHandler.ashx?action=UpFile', //用于文件上传的服务器端请求地址
                    secureuri: false, //是否需要安全协议，一般设置为false
                    fileElementId: 'fileExcel', //文件上传域的ID
                    dataType: 'json', //返回值类型 一般设置为json
                    success: function (data, status)  //服务器成功响应处理函数
                    {
                        //上传成功
    
                    },
                    error: function (data, status, e)//服务器响应失败处理函数
                    {
                        alert(e);
                    }
                })
           } catch (e) {
               alert(e.Message)
           }
            return false;
        }
    </script>
    </html>

ajaxfileupload源代码修改如下：

//      源代码  
        //        if(window.ActiveXObject) \{  
        //            var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');  
        //            if(typeof uri== 'boolean')\{  
        //                io.src = 'javascript:false';  
        //            \}  
        //            else if(typeof uri== 'string')\{  
        //                io.src = uri;  
        //            \}  
        //        \}else \{  
        //            var io = document.createElement('iframe');  
        //           io.id = frameId;  
        //            io.name = frameId;  
        //        \}

//修改源代码，参考网上大神修改内容  
        if (window.ActiveXObject) \{  
            *if (jQuery.browser.version == "9.0" || jQuery.browser.version == "10.0") \{  
                var io = document.createElement('iframe');  
                io.id = frameId;  
                io.name = frameId;  
            \} else if (jQuery.browser.version == "6.0" || jQuery.browser.version == "7.0" || jQuery.browser.version == "8.0") \{  
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');  
                if (typeof uri == 'boolean') \{  
                    io.src = 'javascript:false';  
                \}  
                else if (typeof uri == 'string') \{  
                    io.src = uri;  
                \}  
            \}*  
        \}  
        else \{  
            var io = document.createElement('iframe');  
            io.id = frameId;  
            io.name = frameId;  
        \}

jQuery.extend({
        createUploadIframe: function (id, uri) {
            //create frame
            var frameId = 'jUploadFrame' + id;
    
            //*********************************************源代码，参考网上大神修改内容
            //        if(window.ActiveXObject) {
            //            var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
            //            if(typeof uri== 'boolean'){
            //                io.src = 'javascript:false';
            //            }
            //            else if(typeof uri== 'string'){
            //                io.src = uri;
            //            }
            //        }else {
            //            var io = document.createElement('iframe');
            //           io.id = frameId;
            //            io.name = frameId;
            //        }
    
            //***********************************************修改源代码
            if (window.ActiveXObject) {
                if (jQuery.browser.version == "9.0" || jQuery.browser.version == "10.0") {
                    var io = document.createElement('iframe');
                    io.id = frameId;
                    io.name = frameId;
                } else if (jQuery.browser.version == "6.0" || jQuery.browser.version == "7.0" || jQuery.browser.version == "8.0") {
                    var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                    if (typeof uri == 'boolean') {
                        io.src = 'javascript:false';
                    }
                    else if (typeof uri == 'string') {
                        io.src = uri;
                    }
                }
            }
            else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';
    
            document.body.appendChild(io);
    
            return io
        },
        createUploadForm: function (id, fileElementId) {
            //create form
            var formId = 'jUploadForm' + id;
            var fileId = 'jUploadFile' + id;
            var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
            var oldElement = $('#' + fileElementId);
            var newElement = $(oldElement).clone();
            $(oldElement).attr('id', fileId);
            $(oldElement).before(newElement);
            $(oldElement).appendTo(form);
            //set attributes
            $(form).css('position', 'absolute');
            $(form).css('top', '-1200px');
            $(form).css('left', '-1200px');
            $(form).appendTo('body');
            return form;
        },
        addOtherRequestsToForm: function (form, data) {
            // add extra parameter
            var originalElement = $('<input type="hidden" name="" value="">');
            for (var key in data) {
                name = key;
                value = data[key];
                var cloneElement = originalElement.clone();
                cloneElement.attr({ 'name': name, 'value': value });
                $(cloneElement).appendTo(form);
            }
            return form;
        },
    
        ajaxFileUpload: function (s) {
            // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
            s = jQuery.extend({}, jQuery.ajaxSettings, s);
            var id = new Date().getTime()
            var form = jQuery.createUploadForm(id, s.fileElementId);
            if (s.data) form = jQuery.addOtherRequestsToForm(form, s.data);
            var io = jQuery.createUploadIframe(id, s.secureuri);
            var frameId = 'jUploadFrame' + id;
            var formId = 'jUploadForm' + id;
            // Watch for a new set of requests
            if (s.global && !jQuery.active++) {
                jQuery.event.trigger("ajaxStart");
            }
            var requestDone = false;
            // Create the request object
            var xml = {}
            if (s.global)
                jQuery.event.trigger("ajaxSend", [xml, s]);
            // Wait for a response to come back
            var uploadCallback = function (isTimeout) {
                var io = document.getElementById(frameId);
                try {
                    if (io.contentWindow) {
                        xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
                        xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;
    
                    } else if (io.contentDocument) {
                        xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
                        xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
                    }
                } catch (e) {
                    jQuery.handleError(s, xml, null, e);
                }
                if (xml || isTimeout == "timeout") {
                    requestDone = true;
                    var status;
                    try {
                        status = isTimeout != "timeout" ? "success" : "error";
                        // Make sure that the request was successful or notmodified
                        if (status != "error") {
                            // process the data (runs the xml through httpData regardless of callback)
                            var data = jQuery.uploadHttpData(xml, s.dataType);
                            // If a local callback was specified, fire it and pass it the data
                            if (s.success)
                                s.success(data, status);
    
                            // Fire the global callback
                            if (s.global)
                                jQuery.event.trigger("ajaxSuccess", [xml, s]);
                        } else
                            jQuery.handleError(s, xml, status);
                    } catch (e) {
                        status = "error";
                        jQuery.handleError(s, xml, status, e);
                    }
    
                    // The request was completed
                    if (s.global)
                        jQuery.event.trigger("ajaxComplete", [xml, s]);
    
                    // Handle the global AJAX counter
                    if (s.global && ! --jQuery.active)
                        jQuery.event.trigger("ajaxStop");
    
                    // Process result
                    if (s.complete)
                        s.complete(xml, status);
    
                    jQuery(io).unbind()
    
                    setTimeout(function () {
                        try {
                            $(io).remove();
                            $(form).remove();
    
                        } catch (e) {
                            jQuery.handleError(s, xml, null, e);
                        }
    
                    }, 100)
    
                    xml = null
    
                }
            }
            // Timeout checker
            if (s.timeout > 0) {
                setTimeout(function () {
                    // Check to see if the request is still happening
                    if (!requestDone) uploadCallback("timeout");
                }, s.timeout);
            }
            try {
                // var io = $('#' + frameId);
                var form = $('#' + formId);
                $(form).attr('action', s.url);
                $(form).attr('method', 'POST');
                $(form).attr('target', frameId);
                if (form.encoding) {
                    form.encoding = 'multipart/form-data';
                }
                else {
                    form.enctype = 'multipart/form-data';
                }
                $(form).submit();
    
            } catch (e) {
                jQuery.handleError(s, xml, null, e);
            }
            if (window.attachEvent) {
                document.getElementById(frameId).attachEvent('onload', uploadCallback);
            }
            else {
                document.getElementById(frameId).addEventListener('load', uploadCallback, false);
            }
            return { abort: function () { } };
    
        },
    
        uploadHttpData: function (r, type) {
            var data = !type;
            data = type == "xml" || data ? r.responseXML : r.responseText;
            // If the type is "script", eval it in global context
            if (type == "script")
                jQuery.globalEval(data);
            // Get the JavaScript object, if JSON is used.
            if (type == "json") {
                // If you add mimetype in your response,
                // you have to delete the '<pre></pre>' tag.
                // The pre tag in Chrome has attribute, so have to use regex to remove
                var data = r.responseText;
                var rx = new RegExp("<pre.*?>(.*?)</pre>", "i");
                var am = rx.exec(data);
                //this is the desired data extracted
                var data = (am) ? am[1] : "";    //the only submatch or empty
                eval("data = " + data);
            }
            // evaluate scripts within html
            if (type == "html")
                jQuery("<div>").html(data).evalScripts();
            //alert($('param', data).each(function(){alert($(this).attr('value'));}));
            return data;
        }
    })

一般处理程序（Handler）接收文件代码如下

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Web;
    using System.Web.SessionState;
    using System.IO;
    
    namespace Web.AjaxHandler.SIMManage
    {
        /// <summary>
        /// SIMInfoHandler 的摘要说明
        /// </summary>
        public class SIMInfoHandler : IHttpHandler
        {
    
            HttpRequest Request;
            HttpResponse Response;
            public void ProcessRequest(HttpContext context)
            {
                context.Response.ContentType = "text/plain";
                Request = context.Request;
                Response = context.Response;
                string action = Request.QueryString["action"];
                switch (action)
                {
                    case "UpFile":
                        UpFile();
                        break;
                }
            }
    
            private void UpFile()
            {
                HttpFileCollection files = Request.Files;
                string msg = string.Empty;
                string error = string.Empty;
                string res = string.Empty;
                try
                {
    
                    string filename = System.IO.Path.GetFileName(files[0].FileName);
    
                    //判断是否有文件
                    if (filename == "")
                    {
                        Response.Write("上传文件为空，请选择上传文件格式为'.xls'的文件。");
                        return;
                    }
    
                    string [] strArrary = filename.Split('.');
                    //判断文件格式
                    if (strArrary.LastOrDefault() != "xls" && strArrary.LastOrDefault() != "xlsx")
                    {
                        Response.Write("上传文件格式不正确，请选择上传文件格式为'.xls'或'.xlsx'的文件。");
                        return;
                    }
    
                    //存放文件
                    if (Directory.Exists(HttpContext.Current.Server.MapPath("~/Document/TemporaryDocuments")) == false)//如果不存在就创建file文件夹
                    {
                        Directory.CreateDirectory(HttpContext.Current.Server.MapPath("~/Document/TemporaryDocuments"));
                    }
                    string url = "~/Document/TemporaryDocuments/" + filename;
                    string path = HttpContext.Current.Server.MapPath(url);
                    files[0].SaveAs(path);
    
                    Response.Write("上传文件成功");
                    return;
                }
                catch (Exception ex)
                {
                }
            }
    
            public bool IsReusable
            {
                get
                {
                    return false;
                }
            }
        }
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2OTk4OTQ1_size_16_color_FFFFFF_t_70][]

[70]: /images/20220519/41b4a2955c45482baa7405c9f30812de.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzE2OTk4OTQ1_size_16_color_FFFFFF_t_70]: /images/20220519/a684fa2642dc41239bf7b1d75e4eb810.png