Using Delegates in C#
Prerequisites
Knowledge of C#
Summary
Students typically struggle with the concepts of delegates in C#, this video demonstrates how delegates are used to allow methods to be passed to methods (or used in expressions)
Video
Reference Materials
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Delegate_Examples
{
class Program
{
static void Main(string[] args)
{
List<SampleObject> list = new List<SampleObject>();
list.Add(new SampleObject("Name 1", false));
list.Add(new SampleObject("Name 2", true));
Console.Write(list.First<SampleObject>().Name);
Console.ReadLine();
Console.Write(list.First(delegate (SampleObject so) { return so.nameIsValid() == false; }).Name);
Console.ReadLine();
Console.Write(list.First<SampleObject>(so => so.nameIsValid() == false).Name);
Console.ReadLine();
}
}
class SampleObject
{
public SampleObject(String name)
{
Name = name;
}
public SampleObject(String name, Boolean valid)
{
Name = name;
Valid = valid;
}
public string Name { get; set; }
public bool Valid { get; set; }
public bool nameIsValid()
{
// Some logic will be here
return Valid;
}
}
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