从jquery到codebehind时，fileupload postedfile为null. [英] fileupload postedfile is null when getting from jquery to codebehind.

问题描述

您好Iam yogesh sharma iam在从HTML输入文件中保存发布文件时遇到问题
放入某个文件夹...
我必须使用jquery获取html输入文件的PostFile，然后使用webmethod将其从后台代码保存到某个文件夹中.我的问题是，当我检查
通过调试我在webmethod中的文件，我将发布文件设为NULL.我得到的是该文件的大小，可以.但是postfile为null..
我的Jquery代码是.....

Hi Iam yogesh sharma iam having problems in saving the postedfile from HTML input file
into some folder...
I Have to get the PostedFile of html input file using jquery and save that file into some folder from codebehind using webmethod. my problem is that when i checked the
file in webmethod by debugging i get the postedfile as NULL. I am getting the size of that file which is OK.But postedfile is null..
My Jquery Code Is.....

function SubmitImage_Click() {
                   var postedfile = ($("#fupdImg"))[0].files[0];
                   //alert(postedfile);
                   var exist = $("#fupdImg").val().split('.').pop();
                   PageMethods.GetNewImageName(exist, postedfile);                     
And My Code behind is....
<pre lang="c#">
[System.Web.Services.WebMethod()]
    [System.Web.Script.Services.ScriptMethod()]
    public static void GetNewImageName(string extension,HtmlInputFile file)
    {
        clsMNC obj = new clsMNC();
        string ssql = "select Count(ProductId)+1 from Product";
        Int32 pid = Convert.ToInt32(obj.getOneValue(ssql));
        string imgName = "img" + "_" + pid +"."+ extension;
        //return imgName;
        string savepath = HttpContext.Current.Server.MapPath(".") + "\\UserImgs\\";
        savepath += imgName;
        hp=file.PostedFile;

在这里我想使用SaveAs方法保存file.postedfile ...
请帮忙，我正在尝试2天以来，但没有收到google的答复.
任何帮助将不胜感激...

Here I want to save file.postedfile using SaveAs Method...
Please help, I am Trying Since 2 days but not getting answer from google..
Any Help wiil be appreciated...

推荐答案

(" #fupdImg"))[ 0 ]; // alert(postedfile); var 存在=

("#fupdImg"))[0].files[0]; //alert(postedfile); var exist =

(" ).val().split(' .' ).流行音乐(); PageMethods.GetNewImageName(exist，postfile); 而我背后的代码是... < pre lang = " > [System.Web.Services.WebMethod()] [System.Web.Script.Services.ScriptMethod()] 公共 静态 void GetNewImageName(字符串扩展名， HtmlInputFile文件) { clsMNC obj = 新 clsMNC(); 字符串ssql = " ; Int32 pid = Convert.ToInt32(obj.getOneValue(ssql)); 字符串imgName = " + " _" + pid + ." +扩展名； // 返回imgName; 字符串savepath = HttpContext.Current.Server.MapPath(" )+ \\ UserImgs \\"; savepath + = imgName; hp = file.PostedFile;

("#fupdImg").val().split('.').pop(); PageMethods.GetNewImageName(exist, postedfile); And My Code behind is.... <pre lang="c#"> [System.Web.Services.WebMethod()] [System.Web.Script.Services.ScriptMethod()] public static void GetNewImageName(string extension,HtmlInputFile file) { clsMNC obj = new clsMNC(); string ssql = "select Count(ProductId)+1 from Product"; Int32 pid = Convert.ToInt32(obj.getOneValue(ssql)); string imgName = "img" + "_" + pid +"."+ extension; //return imgName; string savepath = HttpContext.Current.Server.MapPath(".") + "\\UserImgs\\"; savepath += imgName; hp=file.PostedFile;

在这里我想使用SaveAs方法保存file.postedfile ...
请帮忙，我正在尝试2天以来，但没有收到google的答复.
任何帮助将不胜感激...

Here I want to save file.postedfile using SaveAs Method...
Please help, I am Trying Since 2 days but not getting answer from google..
Any Help wiil be appreciated...

无论何时发生回发，posted-file属性都将变为空白，因此人们可以通过许多方式来处理文件控制，例如
您可以在文件上传控件附近放置一个按钮(例如Upload)，现在用户将选择文件并单击按钮上传，在上传按钮的click事件上，您可以将post-file属性设置为某个隐藏字段，一旦用户单击在页面上的最终提交按钮上，然后您可以将文件上传到服务器.

尝试此 [ ^ ].



--Amit

Whenever post-back occurs, the posted-file property becomes blank, so people handle file control in many ways like

you can place a button (say Upload) near to file upload control, now user will select file and hit the button upload, on the click event of the upload button u can set the posted-file property to some hidden field, once user click on final submit button on the page, then u can upload the file to server.

Try this[^].



--Amit

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