REST可空类型？

问题描述

伊夫打了砖墙。我的REST实现不会接受空的值。

Ive hit a brickwall. My REST implementation wont accept Nullable values.

    [OperationContract]
    [WebInvoke(ResponseFormat = WebMessageFormat.Json, UriTemplate = "/Transactions?AccNo={AccNo}&CostCentreNo={CostCentreNo}&TransactionType={TransactionType}&Outstanding={Outstanding}&CheckStartDate={CheckStartDate}&CheckEndDate={CheckEndDate}")]
    List<Transactions> GetTransactions(Int32 AccNo, Int32 CostCentreNo, Int32 TransactionType, Boolean Outstanding, DateTime? CheckStartDate, DateTime? CheckEndDate);

在哪里我的原始SOAP实现呢。那么，有没有办法解决这？还是必须重新写我的代码？

Where as my origional SOAP implementation does. So is there a way round this? Or do I have to re-write my code?

我还是不很明白为什么一个日期必须是可空反正被设置为null。

I still dont quite get why a datetime must be nullable anyway to be set to null.

推荐答案

有关UriTemplate查询的值的变量必须具有可以通过QueryStringConverter转换类型。 。可空类型是不是

Variables for UriTemplate query values must have types that can be converted by QueryStringConverter. Nullable types is not.

您可以换的参数，并通过它通过POST这样;

You could wrap the parameters and pass it through POST as such;

[DataContract(Name = "Details", Namespace = "")]
public class Details
{
    [DataMember]
    public Int32 AccNo;
    [DataMember]
    public Int32 CostCentreNo;
    [DataMember]
    public Int32 TransactionType;
    [DataMember]
    public Boolean Outstanding;
    [DataMember]
    public DateTime? CheckStartDate;
    [DataMember]
    public DateTime? CheckEndDate;

    public Details()
    {}
}

[OperationContract]
[WebInvoke(Method = "POST", UriTemplate = "/Transactions",
     RequestFormat = WebMessageFormat.Json,
     ResponseFormat = WebMessageFormat.Json,
     BodyStyle = WebMessageBodyStyle.Bare)]
List<Transactions> GetTransactions(Details details);

Opionally，您可以通过日期作为字符串而非日期时间，然后使用DateTime.Parse（）上在接收端的串

Opionally, you could pass the date as strings instead of DateTime, and then use DateTime.Parse() on the string on the receiving end.

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