使用[DisplayFormat（ConvertEmptyStringToNull = false）]的Json错误

Question

我在vs2013中写了一个mvc5项目

控制器中的方法返回json

public override System.Web.Security.MembershipUser  GetUser(string username, bool userIsOnline)
    {
        System.Web.Security.MembershipUser user = db.Users.Where(u => u.Name == username).FirstOrDefault();
        return user;
    }

模型是

public JsonResult QueryConcens(ConcentratorView concenForQuery)
{
    QueryConcentratorsRequest request = new QueryConcentratorsRequest() { ConcenQuery = concenForQuery };

    return
        Json
        (
            concenstratorService
            .QueryConcentrators(request)
            .ConcensView
        );
} 

它返回：

public class ConcentratorView
{
    [Required(ErrorMessage="please input id")]
    public string ConcentratorID { get; set; }

    public string Name { get; set; }

    public string Address { get; set; }
}

我希望地址：null为＆＃34;＆＃34;

然后我添加

[{"ConcentratorID":"43","Name":"345","Address":"345"},
{"ConcentratorID":"56","Name":"","Address":null},
{"ConcentratorID":"concen_123","Name":"wer","Address":null}]

但它返回

[DisplayFormat(ConvertEmptyStringToNull = false)]
public string Address { get; set; }

它丢失了两行

为什么？