在RESTful WCF服务中将类作为参数传递

Question

在我的RESTful WCF Serice中,我需要传递一个类作为URITemplate的参数.我能够传递一个字符串或多个字符串作为参数.但是我有很多字段可以传递给WCF服务.所以我创建了一个类并将所有字段添加为属性,然后我想将此类作为一个参数传递给URITemplate.当我试图将类传递给URITemplate时,我收到错误"路径段必须有类型字符串".它不接受类作为参数.知道如何将类作为参数传递.这是我的代码(inputData是类)

---

    [OperationContract]
    [WebGet(UriTemplate = "/InsertData/{param1}")]
    string saveData(inputData param1);

Answer 1

实际上,您可以在GET请求中传递复杂类型(类),但是您需要通过QueryStringConverter"教"WCF如何使用它.但是,您通常不应该这样做,尤其是在一个会改变服务中某些内容的方法中(GET应该是只读操作).

下面的代码显示了在GET(使用自定义QueryStringConverter)和POST(它应该完成的方式)中传递复杂类型.

public class StackOverflow_6783264
{
    public class InputData
    {
        public string FirstName;
        public string LastName;
    }
    [ServiceContract]
    public interface ITest
    {
        [OperationContract]
        [WebGet(UriTemplate = "/InsertData?param1={param1}")]
        string saveDataGet(InputData param1);
        [OperationContract]
        [WebInvoke(UriTemplate = "/InsertData")]
        string saveDataPost(InputData param1);
    }
    public class Service : ITest
    {
        public string saveDataGet(InputData param1)
        {
            return "Via GET: " + param1.FirstName + " " + param1.LastName;
        }
        public string saveDataPost(InputData param1)
        {
            return "Via POST: " + param1.FirstName + " " + param1.LastName;
        }
    }
    public class MyQueryStringConverter : QueryStringConverter
    {
        public override bool CanConvert(Type type)
        {
            return (type == typeof(InputData)) || base.CanConvert(type);
        }
        public override object ConvertStringToValue(string parameter, Type parameterType)
        {
            if (parameterType == typeof(InputData))
            {
                string[] parts = parameter.Split(',');
                return new InputData { FirstName = parts[0], LastName = parts[1] };
            }
            else
            {
                return base.ConvertStringToValue(parameter, parameterType);
            }
        }
    }
    public class MyWebHttpBehavior : WebHttpBehavior
    {
        protected override QueryStringConverter GetQueryStringConverter(OperationDescription operationDescription)
        {
            return new MyQueryStringConverter();
        }
    }
    public static void Test()
    {
        string baseAddress = "http://" + Environment.MachineName + ":8000/Service";
        ServiceHost host = new ServiceHost(typeof(Service), new Uri(baseAddress));
        host.AddServiceEndpoint(typeof(ITest), new WebHttpBinding(), "").Behaviors.Add(new MyWebHttpBehavior());
        host.Open();
        Console.WriteLine("Host opened");

        WebClient client = new WebClient();
        Console.WriteLine(client.DownloadString(baseAddress + "/InsertData?param1=John,Doe"));

        client = new WebClient();
        client.Headers[HttpRequestHeader.ContentType] = "application/json";
        Console.WriteLine(client.UploadString(baseAddress + "/InsertData", "{\"FirstName\":\"John\",\"LastName\":\"Doe\"}"));

        Console.Write("Press ENTER to close the host");
        Console.ReadLine();
        host.Close();
    }
}

Answer 2

传递类(数据协定)只能通过POST或PUT请求(WebInvoke).GET请求只允许简单类型,其中每个必须UriTemplate是映射到方法中的参数的一部分.