Getting an error while consuming WCF Web service reference

Question

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	est\sourceepos\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

Demo Cloud · Answer

Hello Sir, Please help

Demo Cloud · Answer

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

Demo Cloud · Answer

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

Rajanikant Hawaldar · Answer

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;

Demo Cloud · Answer

Sir please help me

Demo Cloud · Answer

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

Demo Cloud · Answer

Its already present sir. Sir, What must be the datatype selection while calling WCF service in xamarin form? Please help

Rajanikant Hawaldar · Answer

Add this using directive: using System.Linq

Demo Cloud · Answer

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

Rajanikant Hawaldar · Answer

Post the line of code where your calling this method LoginUserDetails

Demo Cloud · Answer

Please help Sir, I'm not getting how to change the datatype

Demo Cloud · Answer

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

Rajanikant Hawaldar · Answer

Go to this method LoginUserDetailsAsync and change return type to List. Example=> public List LoginUserDetails(UserDetails userInfo) { List usr = new List (); //.. return usr; } }

Demo Cloud · Answer

Hello Sir, How and where I've to change the data type. Please help Thanks

Rajanikant Hawaldar · Answer

Change return type to list of this method LoginUserDetailsAsync then you will not get error hope you understand.

Demo Cloud · Answer

Link referred is shown below https://www.c-sharpcorner.com/UploadFile/81b528/Asp-Net-web-application-using-wcf/ Please help me

Getting an error while consuming WCF Web service reference

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Answers (16)