Getting an error while consuming WCF Web service reference

Demo Cloud

Hello Sir,

I'm using below llink to create and consume a WCF webservice in Xamarin forms(cross platform), but I'm getting a error show below.

Severity Code Description Project File Line Suppression State

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?) LoginForm C:\Users\test\source\repos\LoginForm\LoginForm\LoginForm\MainPage.xaml.cs 26 Active

The data type selected while calling a web service was "System.Collections.Generic.List" for Collection type and for Dictionary collection type it was by default "System.Collections.Generic.Dictionary".

Below is the code which im using in MainPage.Xaml.cs

private void BtnLogin_Clicked(object sender, EventArgs e)

{

try

{

UserDetails userinfo = new UserDetails();

userinfo.UserName = usernameEntry.Text;

userinfo.Password = passwordEntry.Text;

List msg = obj.LoginUserDetailsAsync(userinfo).ToList();

messageLabel.Text = "Employee Name = " + msg.ElementAt(0) + " Employee Id = " + msg.ElementAt(1);

}

catch (Exception ex)

{

messageLabel.Text = "Wrong Id Or Password";

}

Error is displayed on ToList().

Please help me

Thanks in advance

16 Replies

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

Demo Cloud6y ago
Hello Sir,
Please help
0
Demo Cloud6y ago
Hello Sir,
How to add dll in xamarin project
Its giving an error like The reference is invalid or unsupported
Please Sir, please help
0
Demo Cloud6y ago
Hello Sir,

I have add

Install-Package System.Linq.Parallel -Version 4.3.0

but how to add dll , i didn't get what you said

please help me
0
Rajanikant Hawaldar6y ago
Make sure you added System.Linq and System.Linq.Parallel.dll under reference and using in class as using System.Linq; using System.Linq.Parallel;
0
Demo Cloud6y ago
Sir please help me
0
Demo Cloud6y ago
Below are the images for steps I'm using to call the WCF service,
Sir, Hopw I'm using the correct datatype selection as shown in above image.
Please help me sir
0
Demo Cloud6y ago
Its already present sir.
Sir, What must be the datatype selection while calling WCF service in xamarin form?
Please help
0
Rajanikant Hawaldar6y ago
Add this using directive: using System.Linq
0
Demo Cloud6y ago
Hello Sir,

Below is the code,
public partial class MainPage : ContentPage
{
LoginServiceReference.Service1Client obj = new LoginServiceReference.Service1Client();
public MainPage()
{
InitializeComponent();
}
private void BtnLogin_Clicked(object sender, EventArgs e)
{
try
{
UserDetails userinfo = new UserDetails();
userinfo.UserName = usernameEntry.Text;
userinfo.Password = passwordEntry.Text;
List msg = obj.LoginUserDetailsAsync(userinfo).ToList();
messageLabel.Text = "Employee Name = " + msg.ElementAt(0) + " Employee Id = " + msg.ElementAt(1);
}
catch (Exception ex)
{
messageLabel.Text = "Wrong Id Or Password";
}
}
}
Please help me Sir
0
Rajanikant Hawaldar6y ago
Post the line of code where your calling this method LoginUserDetails
0
Demo Cloud6y ago
Please help Sir,
I'm not getting how to change the datatype
0
Demo Cloud6y ago
Hello Sir,
below is the code which im using in Service1.svc.cs
public List<string> LoginUserDetails(UserDetails userInfo)
{
List<string> usr = new List<string>();
SqlConnection con = new SqlConnection("Data Source=XXXXXX; Initial Catalog=crm_db; User ID=sa; Password=XXXX");
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;
}
If i remove string from the method its giving me an error.
Please sir help
0
Rajanikant Hawaldar6y ago
Go to this method LoginUserDetailsAsync and change return type to List. Example=> public List LoginUserDetails(UserDetails userInfo) { List usr = new List(); //.. return usr; } }
0
Demo Cloud6y ago
Hello Sir,
How and where I've to change the data type.
Please help
Thanks
0
Rajanikant Hawaldar6y ago
Change return type to list of this method LoginUserDetailsAsync then you will not get error hope you understand.
0
Demo Cloud6y ago
Link referred is shown below
https://www.c-sharpcorner.com/UploadFile/81b528/Asp-Net-web-application-using-wcf/
Please help me
0