HomeSearch

C# Type Class: Returned by typeof, GetType

Use Type from the System namespace. The Type class is returned by typeof and GetType.
Type describes data types. It stores type information in a variable, property or field. The Type class represents the program's metadata, which is a description of its structure but not the instructions that are executed.Reflection
Example. First, the Type class is found in the System namespace in the .NET Framework base class library. You can use Type variables in the same way as other variables such as string or int.

Note: You can assign Type variables to the result of a typeof expression. And methods receive a Type parameter as an argument.

Here: A Type is returned by the typeof operator and the GetType method. We call method on the Type.

typeofGetType

Program: This shows that you can use Type variables and assign them to the result of evaluations of the typeof operator.

Tip: The Type variables are loaded onto the evaluation stack in the same way as other variables are.

C# program that uses Type variables using System; class Program { static void Main() { // Use type variables. // ... Then pass the variables as an argument. Type type1 = typeof(string[]); Type type2 = "string".GetType(); Type type3 = typeof(Type); Test(type1); Test(type2); Test(type3); } static void Test(Type type) { // Print some properties of the Type formal parameter. Console.WriteLine("IsArray: {0}", type.IsArray); Console.WriteLine("Name: {0}", type.Name); Console.WriteLine("IsSealed: {0}", type.IsSealed); Console.WriteLine("BaseType.Name: {0}", type.BaseType.Name); Console.WriteLine(); } } Output IsArray: True Name: String[] IsSealed: True BaseType.Name: Array IsArray: False Name: String IsSealed: True BaseType.Name: Object IsArray: False Name: Type IsSealed: False BaseType.Name: MemberInfo
Metadata. In the C# language, the Type class is not actually used in the inheritance and class-based system. Instead, classes inherit from the Object type. The "Type" type is a representation of the metadata, which is data about the program.

Therefore: The Type class can be seen as a sort of information about the program, but not the program itself.

Summary. Type objects can be stored as fields and static fields. They can be passed as arguments and used as local variables. Type data is stored on the managed heap because it is an object reference. And some functions receive Type arguments.
© 2007-2019 Sam Allen. Every person is special and unique. Send bug reports to info@dotnetperls.com.
Home
Dot Net Perls