CODEWITHSUNDEEP
c#asp.netlinq
Alfred Alfizo Mosima
Alfred Alfizo Mosima

Reputation: 721

Linq Method error

I'm trying to write a Linq method which i will call using ajax. I have the following error i dont know how to solve it?

Cannot implicitly convert type 'System.Collections.Generic.List<ChillZARdev.Contents.DesignProfile.SearchResults>' to 'System.Collections.Generic.List<string>' D:\LetsWork0\ChillZARdev\ChillZARdev\Contents\Home.aspx.cs

The error is highlighted on the return lsSearchResults; 

 public static List<SearchResults> lsSearchResults = new List<SearchResults>();

 public static DBRelationalDataContext myDB = new DBRelationalDataContext();  public class SearchResults
    {
        public string Name { get; set; }
        public string Surname { get; set; }

        public SearchResults(string name, string surname)
        {
            Name = name;
            Surname = surname;

        }

    }

 [WebMethod] 

 Public static List<string> QuerySearch()
 {

        var found = (from User in myDB.Memberships
                     where User.Name.ToLower().Contains(RecordSearch) ||
                     User.Surname.ToLower().Contains(RecordSearch) ||

                     (User.Name + " " + User.Surname).ToLower().Contains(RecordSearch) ||
                     (User.Surname + " " + User.Surname).ToLower().Contains(RecordSearch)

                     select new SearchResults(User.Name, User.Surname)).ToList();

        //// validates items in search query if Exist
        if (!ChillZARdev.App_Code.Utilities.IsEmpty(found))
        {
            //  List<string> userRecord = new List<string>();
            List<SearchResults> lsSearchResults = new List<SearchResults>();
            foreach (var user in found)
            {

                //  userRecord.Add(user.Name );
                lsSearchResults.Add(new SearchResults(user.Name, user.Surname));
            }
            //Repeater1.EnableViewState = true;



            return lsSearchResults; // This is where the errror is highlighted

        }
    }

Upvotes: 0

Views: 93

Answers (5)

Sam Leach
Sam Leach

Reputation: 12966

The method

public static List<string> QuerySearch()
{
}

needs to return a List<string> and you are returning a List<SearchResults>.

Either change the return type to match what you are returning or visa versa.

So

public static List<string> QuerySearch()
{
    return new List<string>();
}

or

public static List<SearchResults> QuerySearch()
{
    return new List<SearchResults>();
}

Note, the method return type and the type you return in the method body must match.

Upvotes: 0

Andr&#233; Snede
Andr&#233; Snede

Reputation: 10055

You are telling the compiler you will be returning a List of Strings, but are infact returning a List of SearchResults. The compiler doesn't know how to convert the List of SearchResults to a list of 'Strings'.

Change it from

public static List<string> QuerySearch()

To 

public static List<SearchResults> QuerySearch()

Upvotes: 0

Darren
Darren

Reputation: 70786

You're returning lsSearchResults which is of type SearchResults but the method is expecting a List<string> to be returned.

You can change the return type to be SearchResults like this:

public static List<SearchResults> QuerySearch() {

}

Or return a List<string>

return lsSearchResults.Select(n => n.Name).ToList();

Upvotes: 0

sll
sll

Reputation: 62544

Method return type is List<string> but you return List<SearchResults>, this is not allowed in C#

if you wanted return a list of names just do:

return lsSearchResults.Select(l => l.Name).ToList();

List of surnames will be:

return lsSearchResults.Select(l => l.SurName).ToList();

Or change method return type to List<SearchResults>

Upvotes: 0

James
James

Reputation: 82136

You are trying to return List<SearchResults> when the web method expects List<string>, you need to make sure you return List<string> e.g.

public class SearchResults
{
    public string Name { get; set; }
    public string Surname { get; set; }

    public SearchResults(string name, string surname)
    {
        Name = name;
        Surname = surname;

    }

    public override string ToString()
    {
        return String.Format("{0} {1}", Name, Surname);
    }
}

...
[WebMethod] 
Public static List<string> QuerySearch()
{
    ...
    return lsSearchResults.Select(i => i.ToString());
}

Upvotes: 1

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