ASP.NET MVC的Ajax.ActionLink 的HttpMethod="Get" 一个重复请求的BUG

这段时间使用BootStrap+Asp.net Mvc5开发项目，Ajax.ActionLink遇到一个重复提交的BUG，代码如下：

 @model IList<WFModel.WF_Temp>
 @{
     Layout = null;
 }

 <!DOCTYPE html>

 <html>
     <head>
         <meta name="viewport" content="width=device-width" />
         <title>工作流模板列表</title>
         <link href="~/Content/bootstrap.css" rel="stylesheet" />
         <script src="~/Scripts/jquery-2.1.1.js"></script>
         <script src="~/Scripts/bootstrap.js"></script>
         <script src="~/Scripts/jquery.unobtrusive-ajax.js"></script>
     </head>
     <body>
         @Ajax.ActionLink("添加工作流模板", "AddTemp", "WFTemp", new AjaxOptions()
         {
             HttpMethod="Get"
         },new
         {
             @class = "btn btn-primary",
             data_toggle="modal",
             data_target="#myModal"
         })
         <br/>
         <div class="table-responsive">
             <table class="table">
                 <tr>
                     <th>模板名称</th>
                     <th>提交时间</th>
                     <th>模板的描述</th>
                     <th>模板提交人</th>
                 </tr>
                 <tbody>
                     @{
                         foreach (var item in Model)
                         {
                             <tr>
                                 <td>@item.TempName</td>
                             </tr>
                         }
                     }
                 </tbody>
             </table>
         </div>
     </body>
 </html>
 <!-- Button trigger modal -->
 @*<button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal">
     Launch demo modal
 </button>*@

 <!-- Modal -->
 <div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
     <div class="modal-dialog">
         <div class="modal-content">
             <div class="modal-header">
                 <button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">&times;</span><span class="sr-only">Close</span></button>
                 <h4 class="modal-title" id="myModalLabel">添加模板</h4>
             </div>
             <div class="modal-body">
                 ...
             </div>
             <div class="modal-footer">
                 <button type="button" class="btn btn-default" data-dismiss="modal">取消</button>
                 <button type="button" class="btn btn-primary">保存</button>
             </div>
         </div>
     </div>
 </div>

如何解决呢，HttpMethod="Get"变成"Post"就可以了