用ajax上传图片，HttpPostedFileBase为空Mvc Asp

这个问题在这里已经有了答案：

我怎样才能异步上传文件？ 27个答案

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视图

你可以使用Jquery Ajax来代替

<script>
            function SubmitButtonOnclick()
            { 
                var formData= new FormData();
                var imagefile=document.getElementById("imageFile").files[0];
                formData.append("imageFile",imageFile);
                var xhr = new XMLHttpRequest();
                xhr.open("POST", "/Help/AcceptUpload", true);
                xhr.addEventListener("load", function (evt) { UploadComplete(evt); }, false);
                xhr.addEventListener("error", function (evt) { UploadFailed(evt); }, false);
                xhr.send(formData);

            }

      function UploadComplete(evt) {
        if (evt.target.status == 200) 
                alert("Logo uploaded successfully.");

        else 
                 alert("Error Uploading File");
        }

    function UploadFailed(evt) {
        alert("There was an error attempting to upload the file.");

    }
 </script>

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