WCF JSON IDictionary序列化

Question

考虑遵循以JSON接收和返回数据的WCF方法。

public IDictionary<string, string> GetData(IDictionary<string, string> input)
{
    input.Add("newKey","newValue");
    input.Add("newKey2","newValue2");
    return input;
}

有没有办法通过和;以格式检索JSON：

[{"newKey":"newValue","newKey2":"newValue2"}]

而不是：

[{"Key":"newKey","Value":"newValue"},
{"Key":"newKey2","Value":"newValue2"}]