asp.net-mvc – 在mvc中拖放文件

发布时间：2020-12-15 23:58:10 所属栏目：asp.Net 来源：网络整理

导读：我想使用拖放来上传文件.我编写了如下代码,但每次尝试上传文件时,都显示上传失败.谁能告诉我哪里错了？我想从外部源拖动项目并将其上传到我的文件夹但我无法做到. 对于控制器： – public ActionResult File(){ return View();}/// summary/// The max file

我想使用拖放来上传文件.我编写了如下代码,但每次尝试上传文件时,都显示上传失败.谁能告诉我哪里错了？我想从外部源拖动项目并将其上传到我的文件夹但我无法做到.

对于控制器： –

public ActionResult File()
{
   return View();
}

/// <summary>
/// The max file size in bytes
/// </summary>
protected int maxRequestLength
{
   get
   {
      HttpRuntimeSection section =
         ConfigurationManager.GetSection("system.web/httpRuntime") as HttpRuntimeSection;

      if (section != null)
         return section.MaxRequestLength * 1024; // Default Value
      else
         return 4096 * 1024; // Default Value
   }
}

/// <summary>
/// Checks if a file is sent to the server
/// and saves it to the Uploads folder.
/// </summary>
[HttpPost]
private void handleFileUpload()
{
   if (!string.IsNullOrEmpty(Request.Headers["X-File-Name"]))
   {
      string path = Server.MapPath(string.Format("~/Uploads/{0}",Request.Headers["X-File-Name"]));
      Stream inputStream = Request.InputStream;

      FileStream fileStream = new FileStream(path,FileMode.OpenOrCreate);

      inputStream.CopyTo(fileStream);
      fileStream.Close();
   }
}

为了查看它是： –

<!DOCTYPE html>

<html>
<head runat="server">
    <title>Drag n' Drop File Upload</title>
    <link href="/Style.css" rel="Stylesheet" />
    <style>
body
{
    font: 12px Arial;
}

#dropZone
{
    border-radius: 5px;
    border: 2px solid #ccc;
    background-color: #eee;
    width: 250px;
    padding: 50px 0;
    text-align: center;
    font-size: 18px;
    color: #555;
    margin: 50px auto;
}

#dropZone.hover
{
    border-color: #aaa;
    background-color: #ddd;
}

#dropZone.error
{
    border-color: #f00;
    background-color: #faa;
} 
    </style>
    <script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.6.1.min.js"></script>

    <script type="text/javascript">
        var dropZone;

        // Initializes the dropZone
        $(document).ready(function () {
            dropZone = $('#dropZone');
            dropZone.removeClass('error');

            // Check if window.FileReader exists to make 
            // sure the browser supports file uploads
            if (typeof(window.FileReader) == 'undefined') {
                dropZone.text('Browser Not Supported!');
                dropZone.addClass('error');
                return;
            }

            // Add a nice drag effect
            dropZone[0].ondragover = function () {
                dropZone.addClass('hover');
                return false;
            };

            // Remove the drag effect when stopping our drag
            dropZone[0].ondragend = function () {
                dropZone.removeClass('hover');
                return false;
            };

            // The drop event handles the file sending
            dropZone[0].ondrop = function(event) {
                // Stop the browser from opening the file in the window
                event.preventDefault();
                dropZone.removeClass('hover');

                // Get the file and the file reader
                var file = event.dataTransfer.files[0];

               @* if(file.size > @maxRequestLength {
                            dropZone.text('File Too Large!');
                        dropZone.addClass('error');
                        return false;*@
            //    // Validate file size
            //    if(file.size > <%=maxRequestLength%>) {
            //        dropZone.text('File Too Large!');
            //    dropZone.addClass('error');
            //    return false;
            //}

            // Send the file
            var xhr = new XMLHttpRequest();
        //    xhr.upload.addEventListener('progress',uploadProgress,false);
            xhr.onreadystatechange = stateChange;
            xhr.open('POST','Home/handleFileUpload',true);
            xhr.setRequestHeader('X-FILE-NAME',file.name);
            xhr.send(file);
        };
        });

        // Show the upload progress
        function uploadProgress(event) {
            var percent = parseInt(event.loaded / event.total * 100);
            $('#dropZone').text('Uploading: ' + percent + '%');
        }

        // Show upload complete or upload failed depending on result
        function stateChange(event) {
            if (event.target.readyState == 4) {
                if (event.target.status == 200) {
                    $('#dropZone').text('Upload Complete!');
                }
                else {
                    dropZone.text('Upload Failed!');
                    dropZone.addClass('error');
                }
            }
        }
        //window.onload = fun;
        //function fun() {
        //    $.post("Home/handleFileUpload",{},function (response) {
        //        alert("hi");
        //    })



    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div id="dropZone">
        Drop File Here to Upload.
    </div>
    </form>
</body>
</html>

解决方法

你的HandleFileUpload动作是私密的！在ASP.NET MVC控制器中,操作需要是公共的.另外我建议你在使用语句中包装IDisposable资源以避免泄漏句柄：

[HttpPost]
public ActionResult HandleFileUpload()
{
    if (!string.IsNullOrEmpty(Request.Headers["X-File-Name"]))
    {
        string path = Server.MapPath(string.Format("~/Uploads/{0}",Request.Headers["X-File-Name"]));
        using (var fileStream = new FileStream(path,FileMode.OpenOrCreate))
        {
            Request.InputStream.CopyTo(fileStream);
        }
        return Json(new { success = true });
    }

    return Json(new { success = false });
}

（编辑：李大同）

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