C# 如何在WCF中返回有效的JSON数组

这是我的webInvoke

[WebInvoke(
        Method = "GET",
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Bare,
        UriTemplate = "{invoice}/{transtype}/"

        )
    ]

我有这个返回码

Dictionary<string, object> dic = new Dictionary<string, object>();
        dic.Add("ApprovalStatus", response.ApprovalStatus);
        dic.Add("AuthorizationCode", response.AuthorizationCode);
        dic.Add("CardBalance", response.CardBalance);
        dic.Add("ErrorMessage", response.ErrorMessage);
        dic.Add("InvoiceNumber", response.InvoiceNumber);

        return dic;

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我怎样才能使它成为一个JSON数组？

它是一个有效的JSON数组…@I4V，哦？我想要一些东西{“Data”：[“ApprovalStatus”：“CAPTURED”]}，但它不是有效的json。您最好的选择是

{“数据”：[“ApprovalStatus”，“CAPTURED”]}

 [{"Key":"ApprovalStatus","Value":"CAPTURED"},{"Key":"AuthorizationCode","Value":"TAS926"},{"Key":"CardBalance","Value":null},{"Key":"ErrorMessage","Value":""},{"Key":"InvoiceNumber","Value":"1"},{"Key":"ReferenceNumber","Value":"313506502708"},{"Key":"UniqueCode","Value":"2704"}]