如何删除特定用户上传的文件

Posted 2023-03-23

【中文标题】如何删除特定用户上传的文件

【英文标题】：How to delete uploaded files from specific user

【发布时间】：2015-04-28 10:26:39

【问题描述】：

我在我的创建表单中使用了这个http://www.dropzonejs.com/ 当用户单击“单击此处添加文件”时，文件存储在 Files/TempFile 但是当用户在我的创建方法上单击提交时，我想将所有文件从文件/临时文件移动到从用户上传的文件/票证文件，或者如果用户单击取消以从文件/临时文件中删除所有文件。 问题是如果有多个用户尝试同时上传文件怎么办。如果其中一位用户单击取消或提交如何知道要移动或删除哪些文件。

创建视图

@
ViewBag.Title = "Create";


@using (html.BeginForm("Create", "Ticket", FormMethod.Post, new  enctype = "multipart/form-data" ))

@Html.AntiForgeryToken()
@Html.ValidationSummary(true)
<fieldset>
    <legend>Ticket</legend>

    <div class="editor-label">
        @Html.LabelFor(model => model.idTicket)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.idTicket)
        @Html.ValidationMessageFor(model => model.idTicket)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.idProject, "Project")
    </div>
    <div class="editor-field">
        @Html.DropDownList("idProject", String.Empty)
        @Html.ValidationMessageFor(model => model.idProject)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.tickettDescription)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.tickettDescription)
        @Html.ValidationMessageFor(model => model.tickettDescription)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.assignment, "User")
    </div>
    <div class="editor-field">
        @Html.DropDownList("assignment")
        @Html.ValidationMessageFor(model => model.assignment)
    </div>
    <div class="jumbotron">
        <div class="dropzone" id="dropzoneForm" style="width: 50px; background: none; border: none;">
            <div class="fallback">
                <input type="file" id="fileInput" name="files" multiple="multiple" >
                <input type="submit" id="submit" value="Upload" />
            </div>
        </div>
    </div>


    <div class="clear-fix"></div>
    <p>
        <input type="submit" value="Save" />
    </p>
</fieldset>



<div>
    @Html.ActionLink("Back to List", "Index")
</div>

<script type="text/javascript">
    //File Upload response from the server
    Dropzone.options.dropzoneForm = 

        init: function () 
            this.on("maxfilesexceeded", function (data) 
                $.ajax(

                    url: '@Url.Action("SaveUploadedFile", "File", new  id=1)',
                )
                var res = eval('(' + data.xhr.responseText + ')');
            );
            this.on("addedfile", function (file) 
                // Create the remove button
                var removeButton = Dropzone.createElement("<button>Remove file</button>");

                // Capture the Dropzone instance as closure.
                var _this = this;

                // Listen to the click event
                removeButton.addEventListener("click", function (e) 

                    // Make sure the button click doesn't submit the form:
                    e.preventDefault();
                    e.stopPropagation();
                    // Remove the file preview.
                    $.ajax(
                        type: "POST",
                        url: '@Url.Action("RemoveFile","File")',
                        contentType: "application/json; charset=utf-8",
                        data: "name:" + JSON.stringify(file.name) + "",
                        dataType: "json",
                        success: function ()  _this.removeFile(file); 

                    );
                )

                // Add the button to the file preview element.
                file.previewElement.appendChild(removeButton);
            );
        
    ;

</script>

保存方法

 public ActionResult SaveUploadedFile()
    
        bool isSavedSuccessfully = true;

        string fName = "";
        try
        
            foreach (string fileName in Request.Files)
            
                HttpPostedFileBase file = Request.Files[fileName];
                //Save file content goes here
                fName = file.FileName;
                if (file != null && file.ContentLength > 0)
                
                    string path = Server.MapPath("~/Files/TempFile/") + file.FileName;
                    file.SaveAs(path);

                

            

        
        catch (Exception ex)
        
            isSavedSuccessfully = false;
        


        if (isSavedSuccessfully)
        
            return Json(new  Message = fName );
        
        else
        
            return Json(new  Message = "Error in saving file" );
        
    

我尝试不存储到 TempFile，当我单击创建以获取所有文件时

 foreach (string fileName in Request.Files)

但 Request.Files 始终为空。

【参考方案1】：

在将文件上传到 Files/TempFile 时，为其添加虚拟后缀以识别上传文件的用户，例如。如果用户说“ABC”正在上传文件“File1”，那么在您上传文件的代码中将文件重命名为“File1_ABC”。同样，如果用户“PQR”正在上传“File1”，则文件夹中上传的文件现在应该是“File1_PQR”，当用户“ABC”单击创建方法上的提交时，将文件从 Files/TempFile 移动到后缀为“_ABC”的 Files/TicketFile .