#"is" キーワードは、オブジェクトを特定の型に変換できるかどうかを確認するために使用されます。操作の戻り値の型はブール値です。
using System; namespace DemoApplication{ class Program{ static void Main(){ Employee emp = new PermanentEmployee{ ID = 1, Name = "Martin" }; // Returns true as the derived type can be converted to base type. if (emp is Employee){ Console.WriteLine(emp.Name + " is Employee"); } else{ Console.WriteLine(emp.Name + " is not Employee"); } //Returns true, as the actual object is of type PermanentEmployee. if (emp is PermanentEmployee){ Console.WriteLine(emp.Name + " is PermanentEmployee"); } else{ Console.WriteLine(emp.Name + " is not PermanentEmployee"); } //Returns false, as PermanentEmployee object cannot be converted to //ContractEmployee. if (emp is ContractEmployee){ Console.WriteLine(emp.Name + " is ContractEmployee"); } else{ Console.WriteLine(emp.Name + " is not ContractEmployee"); } } } class Employee{ public int ID { get; set; } public string Name { get; set; } } class PermanentEmployee : Employee{ public int AnnualSalary { get; set; } } class ContractEmployee : Employee{ public int HourlySalary { get; set; } } }
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