c# - Consume WCF service in Xamarin Cross Platform Application

Question

I have created a WCF service that retrieves data from SQL database and can update and modify data into SQL database. I am trying to call WCF methods from xamarin for android and xamarin for iOS. I searched alot for an example how to call PUT and POST method from WCF service through xamarin for android and xamarin for iOS but no luck. I have added the WCF code below for reference. ...even created Web API but all examples and tutorials to consume Web API are for how to call GET method . I don't see any reference document which will show how to call PUT or Post method from WCF or Web api across cross platform. I have tested WCF service through Fiddler and worked fine. What would be the next step ..I have created proxy for this web service using SlsvcUtil.exe as mentioned in xamarin documentation. Can somebody post a one example of xamarin.Android that will call Update or delete method from the below wcf service.Desperately looking for help.Service contains webHttp binding.

WCF

Service1.svc.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Runtime.Serialization; 
using System.ServiceModel; 
using System.ServiceModel.Web; 
using System.Text;

public class Service1 : IService1 
{ 
    public List GetDeptsList() 
    { 
        using (DeptDBEntities entities = new DeptDBEntities()) 
        { 
            return entities.Depts.ToList(); 
        } 
    }

    public Dept GetDeptByID(string no)
    {
        try
        {
            int deptId = Convert.ToInt32(no);

            using (DeptDBEntities entities = new DeptDBEntities())
            {
                return entities.Depts.SingleOrDefault(dept => dept.no == deptId);
            }
        }
        catch
        {
            throw new FaultException("Something went wrong");
        }
    }

    public void AddDept(string name)
    {
        using (DeptDBEntities entities = new DeptDBEntities())
        {
            Dept dept = new Dept { name = name };
            entities.Depts.Add(dept);
            entities.SaveChanges();
        }
    }

    public void UpdateDept(string no, string name)
    {
        try
        {
            int deptId = Convert.ToInt32(no);

            using (DeptDBEntities entities = new DeptDBEntities())
            {
                Dept dept = entities.Depts.SingleOrDefault(b => b.no == deptId);
                dept.name = name;
                entities.SaveChanges();
            }
        }
        catch(Exception e)
        {
            throw new FaultException(e.Message);

        }
    }

    public void DeleteDept(string no)
    {
        try
        {
            int deptId = Convert.ToInt32(no);

            using (DeptAppDBEntities entities = new DeptAppDBEntities())
            {
                Dept dept = entities.Depts.SingleOrDefault(b => b.no == deptId);
                entities.Depts.Remove(dept);
                entities.SaveChanges();
            }
        }
        catch
        {
            throw new FaultException("Something went wrong");
        }
    }

}

web.config

   <?xml version="1.0"?>
      <configuration>
      <configSections>
       <section name="entityFramework"   type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/>
     </configSections>
     <system.web>
     <compilation debug="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
      </assemblies>
      </compilation>
      <pages controlRenderingCompatibilityVersion="4.0"/>
      </system.web>
      <system.serviceModel>
                 <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
      </behaviors>
      <services>
      <service name="WcfWithJsonP.Service1" behaviorConfiguration="restfulBehavior">
        <endpoint address="" behaviorConfiguration="webBehavior" binding="webHttpBinding" bindingConfiguration="" contract="WcfWithJsonP.IService1"/>
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost/Service1"/>
          </baseAddresses>
        </host>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
        </service>
       </services>
      <behaviors>
      <endpointBehaviors>
        <behavior name="webBehavior">
          <webHttp defaultOutgoingResponseFormat="Json"/>
        </behavior>
      </endpointBehaviors>
      <serviceBehaviors>
        <behavior name="restfulBehavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
      </behaviors>
      <serviceHostingEnvironment multipleSiteBindingsEnabled="true"/>
      </system.serviceModel>
     <system.webServer>
     <modules runAllManagedModulesForAllRequests="true"/>
        <directoryBrowse enabled="true"/>
     </system.webServer>
     <entityFramework>
     <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory,   EntityFramework">
      <parameters>
        <parameter value="v12.0"/>
      </parameters>
     </defaultConnectionFactory>
     </entityFramework>
    </configuration

>

Main.axml for

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:minWidth="25px"
    android:minHeight="25px">
    <LinearLayout
        android:orientation="vertical"
        android:layout_width="134.1dp"
        android:layout_height="fill_parent"
        android:minWidth="25px"
        android:minHeight="25px">
        <TextView
            android:text="Enter No:"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:layout_width="163.4dp"
            android:layout_height="wrap_content"
            android:id="@+id/No"
            android:layout_marginBottom="27.5dp"
            android:layout_marginTop="0.0dp"
            android:layout_marginLeft="5dp" />
        <TextView
            android:text="Enter name:"
            android:textAppearance="?android:attr/textAppearanceSmall"
            android:layout_width="252.7dp"
            android:layout_height="wrap_content"
            android:id="@+id/Name"
            android:layout_marginBottom="27.5dp"
            android:layout_marginTop="0.0dp"
            android:layout_marginLeft="5dp"
            android:enabled="false"
            android:visibility="invisible" />
    </LinearLayout>
    <Button
        android:id="@+id/Get"
        android:layout_width="fill_parent"
        android:layout_height="36.6dp"
        android:text="Get" />
    <Button
        android:id="@+id/ADD"
        android:layout_width="fill_parent"
        android:layout_height="36.6dp"
        android:text="ADD" />
    <Button
        android:id="@+id/Update"
        android:layout_width="fill_parent"
        android:layout_height="36.6dp"
        android:text="Update" />
    <Button
        android:id="@+id/Delete"
        android:layout_width="fill_parent"
        android:layout_height="36.6dp"
        android:text="Delete" />
    <TextView
        android:text=""
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/ValueNo"
        android:layout_marginBottom="27.5dp"
        android:layout_marginTop="0.0dp"
        android:background="@android:color/holo_purple" />
    <TextView
        android:text=""
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/ValueName"
        android:layout_marginBottom="27.5dp"
        android:layout_marginTop="0.0dp"
        android:background="@android:color/holo_purple" />
</LinearLayout>

Answer 1

Here is a simple code snippet to use as a guide:

//first at the class level, create a private variable for the client.
private Service1Client _client;
private Button _addButon;
private TextView _txtDeptName;

//Initialize the _client in the OnCreate() method.
protected override void OnCreate(Bundle bundle)
{
     base.OnCreate(bundle);

     var endpoint = new EndpointAddress("http://<ipAddress:port>/Service1.svc");

     var binding = new BasicHttpBinding{
        Name = "basicHttpBinding",
        MaxBufferSize = 2147483647,
        MaxReceivedMessageSize = 2147483647
    };

    TimeSpan timeout = new TimeSpan(0, 0, 30);
    binding.SendTimeout = timeout;
    binding.OpenTimeout = timeout;
    binding.ReceiveTimeout = timeout;

    _client = new Service1Client(binding, endpoint);
    _client.AddDeptCompleted += ClientAddDeptCompleted;

    _addButton = FindViewById<Button>(Android.Resources.Id.Add);
    _addbutton.Click += AddButton_Clicked;

    _txtDeptName = FindViewbyId<TextView>(Android.Resources.Id.Name);
}

//Then within the event handlers, do something like this
public void AddButton_Clicked(object sender, EventArgs e)
{
     _client.AddDeptAsync(_txtDeptName.Text);
}

//Handle the request completed event.
private void ClientAddDeptCompleted(object sender, AddDeptCompletedEventArgs addDeptCompletedEventArgs)
{
     //TODO: Something with the notification that the request has completed.
}

You should be able to follow a similar pattern for the other buttons and service calls as well. I apologize if I have made some typos. I'm going from a bit of memory and some of the WCF instructions on the Xamarin site.