static void Main(string[] args)
{
PayrollSystem payroll = new PayrollSystem();
payroll.Add(new Employee {
Name = "John", Salary = 200
});
payroll.Add(new Employee {
Name = "Mary", Salary = 250, City = "Paris"
});
payroll.Add(new Employee {
Name = "Kate", Salary = 230
});
payroll.Add(new Employee {
Name = "Mike", Salary = 280
});
var query = from employee in payroll
where employee.Salary > 220
select employee.Name;
query.ToList().ForEach(Console.WriteLine);
//LINQ to Strings
string s = Guid.NewGuid().ToString();
string digitsOnly =
new string((from c in s
where Char.IsDigit(c)
select c).ToArray());
Console.WriteLine(s + Environment.NewLine + digitsOnly);
//LINQ to Reflection
var queryableTypes =
from asm in AppDomain.CurrentDomain.GetAssemblies()
from t in asm.GetExportedTypes()
where t.GetInterfaces().Any(itf =>
itf.IsGenericType &&
((itf.IsGenericTypeDefinition && itf == typeof(ICollection <>)) ||
(!itf.IsGenericTypeDefinition && itf.GetGenericTypeDefinition() == typeof(ICollection <>)))
) ||
typeof(IEnumerable).IsAssignableFrom(t) && t.GetMethods().Any(m => m.Name == "Add")
select t;
queryableTypes.ToList().ForEach(t => Console.WriteLine(t.FullName));
//LINQ to File System
var largeDllFiles =
from file in Directory.GetFiles(
Environment.GetFolderPath(Environment.SpecialFolder.System))
let info = new FileInfo(file)
where info.Extension == ".dll" && info.Length > 5000000
select info.FullName;
largeDllFiles.ToList().ForEach(Console.WriteLine);
//LINQ to WCF contracts
var operations =
from operation in ContractDescription.GetContract(typeof(IService)).Operations
where !operation.IsOneWay
where operation.Faults.Any(f => f.DetailType == typeof(string))
select new { operation.DeclaringContract.Namespace, operation.SyncMethod.Name };
operations.ToList().ForEach(Console.WriteLine);
}
public static IEnumerable <T> Select <T>(this PayrollSystem payroll, Func <Employee, T> selector)
{
return(payroll.employees.Select(selector));
}