Getting error after calling WCF webservice in Xamarin forms

Hello Sir,

I'm new to development and WCF Web services.

I'm getting below error after consuming WCF web services in my Xamarin cross platform project.

Error CS1061 'Task' does not contain a definition for 'ToList' and no accessible extension method 'ToList' accepting a first argument of type 'Task' could be found (are you missing a using directive or an assembly reference?) WCF_LoginApp

Code for Service1.svc.cs

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.ServiceModel.Web;
using System.Text;
namespace ServiceLogin
{
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
// NOTE: In order to launch WCF Test Client for testing this service, please select Service1.svc or Service1.svc.cs at the Solution Explorer and start debugging.
public class Service1 : IService1
{
public List<string> LoginUserDetails(UserDetails userInfo)
{
List<string> usr = new List<string>();
SqlConnection con = new SqlConnection("Data Source=Test; Initial Catalog=crm_db; User ID=sa; Password=*****");
con.Open();
SqlCommand cmd = new SqlCommand("select username,password from crm_tbl_admin where username=@UserName and password=@Password", con);
cmd.Parameters.AddWithValue("@UserName", userInfo.UserName);
cmd.Parameters.AddWithValue("@Password", userInfo.Password);
SqlDataReader dr = cmd.ExecuteReader();
if (dr.Read() == true)
{
usr.Add(dr[0].ToString());
}
con.Close();
return usr;
}
}
}

Code for consuming the above service in my MainPage.Xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using ServiceReference1;
using System.ServiceModel;
namespace WCF_LoginApp
{
public partial class MainPage : ContentPage
{
Service1Client obj = new Service1Client();
private static EndpointAddress endPoint = new EndpointAddress("http://localhost/ServiceLogin/Service1.svc");
private static NetTcpBinding binding;
public MainPage()
{
InitializeComponent();
binding = CreateBasicHttpBinding();
}
private static NetTcpBinding CreateBasicHttpBinding()
{
NetTcpBinding binding = new NetTcpBinding
{
Name = "netTcpBinding",
MaxBufferSize = 2147483647,
MaxReceivedMessageSize = 2147483647
};
TimeSpan timeout = new TimeSpan(0, 0, 30);
binding.SendTimeout = timeout;
binding.OpenTimeout = timeout;
binding.ReceiveTimeout = timeout;
return binding;
}
private void BtnLogin_Clicked(object sender, EventArgs e)
{
try
{
UserDetails userinfo = new UserDetails();
userinfo.UserName = usernameEntry.Text;
userinfo.Password = passwordEntry.Text;
List<string> msg = obj.LoginUserDetailsAsync(userinfo).ToList();
//var result = obj.LoginUserDetailsAsync(userinfo);
//string msg = result.ToString();
messageLabel.Text = "Employee Name = " + msg.ElementAt(0);
}
catch (Exception ex)
{
// messageLabel.Text = "Wrong Id Or Password";
throw ex;
}
}
}
}

The code for Webconfig for WCF project is below

"1.0"?>
"aspnet:UseTaskFriendlySynchronizationContext" value="true" />
"true" targetFramework="4.6.1" />
"4.6.1"/>
"true" httpsGetEnabled="true"/>
"false"/>
"ServiceLogin.Service1" >
"Service1" contract="ServiceLogin.IService1" binding="wsHttpBinding" />
"Service1" binding="netTcpBinding" contract="ServiceLogin.IService1"/>
"http://localhost:8080/"/>
"net.tcp://localhost:8090/"/>
"wsHttpBinding" scheme="http" />
"netTcpBinding" scheme="net.tcp"/>
"true" multipleSiteBindingsEnabled="true" />
"true"/>
"true"/>

Please help

Thanks in advance

After changing the code i'm getting below error please help how to resolve.

Unhandled Exception:

System.ServiceModel.FaultException`1[[System.ServiceModel.ExceptionDetail, System.ServiceModel, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Error in deserializing body of request message for operation 'LoginUserDetails'. OperationFormatter encountered an invalid Message body. Expected to find node type 'Element' with name 'LoginUserDetails' and namespace 'http://tempuri.org/'. Found node type 'Element' with name 'LoginUserDetailsAsync' and namespace 'http://tempuri.org/' occurred

The updated code is

try

{

UserDetails userinfo = new UserDetails();

userinfo.UserName = usernameEntry.Text;

userinfo.Password = passwordEntry.Text;

var data = await obj.LoginUserDetailsAsync(userinfo);

List msg = data.ToList();

messageLabel.Text = "Employee Name = " + msg.ElementAt(0);

}

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Demo Cloud6y ago
Please help me out to resolve the error
Thanks
0
Demo Cloud6y ago
Please anyone help
0
Demo Cloud6y ago
After changing the code i'm getting below error please help how to resolve.
Unhandled Exception:
System.ServiceModel.FaultException`1[[System.ServiceModel.ExceptionDetail, System.ServiceModel, Version=2.0.5.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]: Error in deserializing body of request message for operation 'LoginUserDetails'. OperationFormatter encountered an invalid Message body. Expected to find node type 'Element' with name 'LoginUserDetails' and namespace 'http://tempuri.org/'. Found node type 'Element' with name 'LoginUserDetailsAsync' and namespace 'http://tempuri.org/' occurred
The updated code is

try
{
UserDetails userinfo = new UserDetails();
userinfo.UserName = usernameEntry.Text;
userinfo.Password = passwordEntry.Text;
var data = await obj.LoginUserDetailsAsync(userinfo);
List msg = data.ToList();
messageLabel.Text = "Employee Name = " + msg.ElementAt(0);
}

0
Demo Cloud6y ago
Hello Sir,
After applying the changes I'm getting below error,
Unhandled Exception:
System.NotImplementedException: The method or operation is not implemented.
Please help me
Thanks
0
Salman Beg6y ago
Use like this, var msg = obj.LoginUserDetailsAsync(userinfo); Also debug the code so you will get more clarity. Thanks.
0
Demo Cloud6y ago
Hello Sir,
Then how to resolve sir,
Please help
0
Salman Beg6y ago
Hi. As per the error it is saying that you can't use ToList() in this line, List msg = obj.LoginUserDetailsAsync(userinfo).ToList(); thanks
0