using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace lambda
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("传统的委托代码示例：");
FindListDelegate();
Console.WriteLine("\n");
Console.WriteLine("使用匿名方法的示例：");
FindListAnonymousMethod();
Console.WriteLine("\n");
Console.WriteLine("使用Lambda的示例： ");
FindListLambdaExpression();
}
//传统调用委托的示例
private static void FindListDelegate()
{
List<string> list=new List<string>();
list.AddRange(new string[]{"ASP.NET课程","J2EE课程","PHP课程","数据结构课程"});
Predicate<string> finPredicate=new Predicate<string>(IsBookCategory);
List<string> BookCategory = list.FindAll(finPredicate);
foreach (string str in BookCategory)
{
Console.WriteLine("{0}\t",str);
}
}

private static bool IsBookCategory(string str)
{
return str.EndsWith("课程")?true:false;
}

private static void FindListAnonymousMethod()
{
List<string> list = new List<string>();
list.AddRange(new string[] { "ASP.NET课程", "J2EE课程", "PHP课程", "数据结构课程" });
List<string> bookCategory = list.FindAll(delegate(string str)
{
return str.EndsWith("课程")?true:false;
});
foreach (string str in bookCategory)
{
Console.WriteLine("{0}\t",str);
}
}

private static void FindListLambdaExpression()
{
List<string> list = new List<string>();
list.AddRange(new string[] { "ASP.NET课程", "J2EE课程", "PHP课程", "数据结构课程" });
List<string> bookCategory=list.FindAll((string str)=>str.EndsWith("课程"));
foreach (string str in bookCategory)
{
Console.WriteLine("{0}\t",str);
}
Console.ReadLine();

}
}
}