MVC上传附件后台获取不到

<div id="uploadExcel" title="导入" class="easyui-window" data-options="modal:true,closed:true,minimizable:false,shadow:false">
    <form id="ajaxForms" enctype="multipart/form-data">
        <input id="fileExcel" name="fileExcel" type="file" class="file" />
        <input id="Button1" onclick="ImportData()" type="button" value="上传附件" />
    </form>
</div>

<script>
function ImportData(){
            if (document.getElementById("fileExcel").value) {
                $('#ajaxForms').form('submit', {
                    url: '/FixedAssets/Budget/LoadExcel',
                    success: function (data) {
                        alert(data);
                    }
                });
            } else {
                alert("请选择附件！");
                return;
            }
        }
</script>

 public string LoadExcel(HttpPostedFileBase fileExcel)
        {
                HttpPostedFileBase files = Request.Files["fileExcel"];
                string SourceFileName = files.FileName;
                                return"";
                }

图片说明

shang mian xie cuo le

 public string LoadExcel(string fileExcel)
{

 }

shishi

```public string LoadExcel(HttpPostedFileBase fileExcel,string fileExcel)
{

mvc是什么,如果是springmvc的话
public string LoadExcel(CommonsMultipartFile fileExcel)
{

}

记得配文件解析器