C# MVC AJAX文件上载-停止工作

我有一个通过AJAX请求将文件和其他数据上传到MVC控制器的解决方案

很长一段时间以来，它一直运行良好，但今天，我一直在调查人们报告的问题，现在它似乎根本无法运行；我现在收到返回的“未找到资源”错误

如果我从AJAX调用中删除“data:fileData”，那么它就能够解析URL，但是显然，没有数据要处理

有人能解释为什么它会以这种方式停止工作吗？我无法解释这一点

简言之： AJAX调用不再能够解析控制器方法URL。在存储库历史记录中，最近没有对此功能进行明显的更改

谢谢,， 马修

更新 对于那些感兴趣的人来说，事实证明，我要测试的特定PDF文件的大小一直是罪魁祸首……这个解决方案仍然有效，并且可以在

将以下内容添加到web.config文件：

---

错误来自您的C代码。我建议仔细研究一下，找出到底是哪一部分逻辑导致了回复@Rory的问题。问题是，C#代码甚至没有被访问（除非我从AJAX调用中删除数据），所以我没有什么可以插手的。当你说你得到“资源未找到”时，状态代码是404吗？我实际上没有看到状态代码，但我使用Firebug得到的响应是：资源未找到{“appName”：“Chrome”，“requestId:“b05fab316df7456b97540fb876a093c8”}您可以尝试以下内容类型：contentType:“多部分/表单数据”

<system.web>
    <httpRuntime maxRequestLength="10240" />
    <!--This allows larger files to be uploaded (10MB in KB)-->
</system.web>
...
<system.webServer>
    <security>
        <requestFiltering>
            <requestLimits maxAllowedContentLength="10485760" />
            <!--This allows larger files to be uploaded (10MB in Bytes)-->
        </requestFiltering>
    </security>
</system.webServer>

function SaveAttachmentData() {
    var attachmentID = $('#attachmentrecordid').val();
    var servID = $('#servrecordid').val();
    var description = $('#txtattachmentdescription').val();

    // Checking whether FormData is available in browser
    if (window.FormData !== undefined) {

        var fileUpload = $("#attachmentfile").get(0);
        var files = fileUpload.files;

        // Create FormData object
        var fileData = new FormData();

        // Looping over all files and add it to FormData object
        for (var i = 0; i < files.length; i++) {
            fileData.append(files[i].name, files[i]);
        }

        // Adding keys to FormData object
        fileData.append('service_id', servID);
        fileData.append('dataid', attachmentID);
        fileData.append('description', description);

        var validData = true;
        if (!isNormalInteger(servID)){validData = false;}
        if (servID < 1) {validData = false;}
        if (files.length == 0 && $('#attachmentrecordid').val() < 1){validData = false;}

        if (validData){ //All data is valid

                $.ajax({
                    url: '/Service/AttachmentCreate',
                    type: "POST",
                    contentType: false, // Not to set any content header
                    processData: false, // Not to process data
                    data: fileData,
                    success: function (result) {
                        ReloadAttachmentTable();
                    },
                    error: function (err) {                            
                        ReloadAttachmentTable();
                    }
                });
            }

        else{
            //Data is not valid
            alert('Invalid data entered!');
            //ShowBannerMessageWarning('Warning!','Invalid data entered!');
        }

    } else {
        alert("FormData is not supported.");
    }
}

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult AttachmentCreate()
    {
        //Upload file
        string message = "";
        DataModel dm = new DataModel();
        Service.Attachment sa = new Service.Attachment();

        //Get request data
        string description = Request.Form["description"];
        int servid = int.Parse(Request.Form["service_id"]);
        HttpFileCollectionBase files = Request.Files;
        //Only continue if a file was uploaded
        if (files.Count > 0)
        {
            //Get the file
            HttpPostedFileBase file = files[0];
            string fname;
            // Checking for Internet Explorer
            if (Request.Browser.Browser.ToUpper() == "IE" || Request.Browser.Browser.ToUpper() == "INTERNETEXPLORER")
            {
                string[] testfiles = file.FileName.Split(new char[] { '\\' });
                fname = testfiles[testfiles.Length - 1];
            }
            else
            {
                fname = file.FileName;
            }
            //Update attachment properties
            sa.ID = servid;
            sa.Description = description;
            sa.Filename = fname; //Assign fname before the full path is added to it
            //Get full filename from attachment class property
            fname = sa.Filename_Structured;

            // Get the complete folder path and store the file inside it.
            fname = Path.Combine(ConfigurationManager.AppSettings["AttachmentFolderLocation"].ToString(), fname);
            //Save file to server
            file.SaveAs(fname);

            //Create file attachment record against service
            message = dm.CreateAttachmentData(ref sa);
            message = message == "" ? "Success" : message;
        }
        else { message = "No file uploaded"; }
        return Content(message);
    }