Question

我想知道如何从WCF Restful服务获取返回值，这是POST方法。如果是GET方法，我可以获得返回值。在GET方法中，webClient.DownloadString（url）;正在返回结果。但是在POST方法的情况下，webClient.UploadString（url，“POST”，data）;没有返回结果，它只是调用Web服务。

我见过很多样本，人们只是用UploadString（）方法调用WCF服务post方法，并假设它返回成功。但我想检查返回值并根据该节目显示相应的消息。

//----------------------------------- WCF RESTful service -----------------------------------
[ServiceContract]
public interface IAppService
{       
    [OperationContract]
    [WebInvoke(UriTemplate = "ValidateVisitPIN", Method = "POST", RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json)]
    bool ValidateVisitPIN(VisitPinRequest visitPinRequest);
}

public class AppService : IAppService
{
    public bool ValidateVisitPIN(VisitPinRequest visitPinRequest)
    {
        //......
        if(visitPinRequest.visitPin == 100)
            return true;
        else
            return false;
    }
}
//----------------------------------- WCF client application -----------------------------------
//POST method
using (WebClient webClient = new WebClient())
{
    VisitPinRequest visitPinRequest = new VisitPinRequest();
    visitPinRequest.VisitPin = txtVisitPIN.Text;

    DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(VisitPinRequest));
    MemoryStream mem = new MemoryStream();
    ser.WriteObject(mem, visitPinRequest);
    string url = webServiceURL + "ValidateVisitPIN";

    string data = Encoding.UTF8.GetString(mem.ToArray(), 0, (int)mem.Length);
    webClient.Headers["Content-type"] = "application/json";
    webClient.Encoding = Encoding.UTF8;
    var returnString = webClient.UploadString(url, "POST", data);
}

//Get method
using (WebClient webClient = new WebClient())
{
    string url = webServiceURL + "ValidateVisitPIN/" + txtVisitPIN.Text;
    string outputString = webClient.DownloadString(url);
    MessageBox.Show(outputString);
}

Answer 1

请试试这个：

private static T Call<T>(string url, string body, int timeOut = 20)
{
    var contentBytes = Encoding.UTF8.GetBytes(body);
    var request = (HttpWebRequest)WebRequest.Create(url);

    request.Timeout = timeOut * 1000;
    request.ContentLength = contentBytes.Length;
    request.Method = "POST";
    request.Accept = "application/json";

    using (var requestWritter = request.GetRequestStream())
        requestWritter.Write(contentBytes, 0, (int)request.ContentLength);

    var responseString = string.Empty;
    var webResponse = (HttpWebResponse)request.GetResponse();
    var responseStream = webResponse.GetResponseStream();
    using (var reader = new StreamReader(responseStream))
    {
        reader.BaseStream.ReadTimeout = timeOut * 1000;
        responseString = reader.ReadToEnd();
    }

    return Newtonsoft.Json.JsonConvert.DeserializeObject<T>(responseString);
}

然后你可以这样称呼它：

        var input = new
        {
            test1="",
            .
            .
            .
        }
        var output = Call<bool>(url, Newtonsoft.Json.JsonConvert.SerializeObject(input));

从作为POST方法的WCF Restful服务获取返回值

1 个答案: