如何将JSON传递给WebGet

Question

我有以下WebGet：

    [WebGet(UriTemplate = "GetAssignments/{data}")]
    [Description("GetAssignments")]
    BASE.BaseResponse<object> GetAssignments(String data); 

这样叫：

    var data = JSON.stringify(advancedSearchDataXml);

    Helper.Service.Call({
        api: 'HomeApi',
        url: '?method=GetAssignments/' + data,
        method: 'GET',
        //data: advancedSearchDataXml,
        controlId: '',
        showProgress: true,
        onSuccess: function (result) {
    ...

数据所在位置

{"searchquery":
    "<SearchQuery>
        <genericsearch></genericsearch>
        <region>MA</region><market>RL</market>
        <recordcount>5000</recordcount>
    </SearchQuery>"
}

这将失败，并显示"EXCEPTION: The remote server returned an error：(400) Bad Request“消息。我做错了什么？