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Convert Dictionary foreach  search to Linq

Posted on 2009-05-13
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Last Modified: 2013-12-17
Hi

is it possible to convert this code to use Linq instead?
private bool Exists(string name)
        {
            foreach (ClientData p in _clients.Keys)
            {
                if (p.Id.Equals(name, StringComparison.OrdinalIgnoreCase))
                {
                    return true;
                }
            }
 
            return false;
        }

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Question by:AWestEng
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11 Comments
 
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Accepted Solution

by:
abel earned 400 total points
ID: 24377004
Yes, it is (btw, there's a LINQ zone too, you may have more luck there...) Here's a one-liner, but you may want to split it a bit:

private bool Exists(string name)
{
    return (from p in _clients.Keys 
        where p.Id.Equals(name, StringComparison.OrdinalIgnoreCase) 
        select p).FirstOrDefault() != null;
}

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Assisted Solution

by:Fernando Soto
Fernando Soto earned 100 total points
ID: 24377422
Hi AWestEng;

Here is code snippet showing how it can be done using Linq methods.

Fernando
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
 
namespace WindowsFormsApplication13
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        List<ClientData> _clients = new List<ClientData>();
 
        private void Form1_Load(object sender, EventArgs e)
        {
            ClientData cd = new ClientData() { Id = "John" };
            _clients.Add(cd);
            cd = new ClientData() { Id = "William" };
            _clients.Add(cd);
            cd = new ClientData() { Id = "AWestEng" };
            _clients.Add(cd);
            cd = new ClientData() { Id = "Alice" };
            _clients.Add(cd);
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            // User types name in text box and copies to name
            string name = textBox1.Text.Trim();
 
            if (!Exists(name))
            {
                MessageBox.Show("Name was NOT found");
            }
            else
            {
                MessageBox.Show("Name was found");
            }
        }
 
        private bool Exists(string name)
        {
            return _clients.Where(c => c.Id.Equals(name, StringComparison.OrdinalIgnoreCase))
                           .Select(c => c.Id == String.Empty ? false : true).FirstOrDefault();
        }
    }
 
    public class ClientData
    {
        public string Id { get; set; }
    }
}

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Author Comment

by:AWestEng
ID: 24377483
sorry FernandoSoto:, I accepted able's reply you where posting yours, I'm sorry m8..
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Expert Comment

by:Fernando Soto
ID: 24377641
Not a problem, that happens. Have a great day.  ;=)
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Expert Comment

by:abel
ID: 24377831
If you want, you can request reopen and split. I won't object to that. FernandoSoto put in quite some effort, though I believe his solution is about the same as what I showed (though slightly more verbose perhaps).
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Expert Comment

by:Fernando Soto
ID: 24377994
No need to do that, it is really not a problem.  ;=)
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Author Closing Comment

by:AWestEng
ID: 31581059
Thx guys,, perfect job
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Expert Comment

by:Fernando Soto
ID: 24395047
Thanks AWestEng and abel.  ;=)
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Author Comment

by:AWestEng
ID: 24395269
No!  Thank you guys! Thx for always put your own time into others problem and help out.
I really appreciate it . :)
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Expert Comment

by:abel
ID: 24396146
you're welcome, both, always around to help (almost)  :)
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