C # value type and reference type,

C # value type and reference type,

Reference Type: always allocated from managed heap

Class, interface, delegate

System. Object, System. String, List, Decoder, etc.

Value Type: generally distributed on the thread stack (Exceptions: Elements in the array, value type fields in the reference type, local variables in the iterator block, and local variables in the closure)

Struct

System. Int32, System. Float, System. Boolean, System. Enum

 

Let's take a look at the class and struct:

 1 namespace RefValTest 2 { 3     class TestRef 4     { 5         public int a; 6         public int b; 7  8         public TestRef(int a, int b) 9         {10             this.a = a;11             this.b = b;12         }13     }14 15     struct TestVal16     {17         public int a;18         public int b;19 20         public TestVal(int a, int b)21         {22             this.a = a;23             this.b = b;24         }25     }26 27     class Program28     {29         static void Main(string[] args)30         {31             TestRef tr = new TestRef(1, 2);32             TestRef tr2 = tr;33             tr2.a = 3;34             System.Console.WriteLine(tr.a); // 335 36             TestVal tv = new TestVal(1, 2);37             TestVal tv2 = tv;38             tv2.a = 3;39             System.Console.WriteLine(tv.a); // 140 41             System.Console.ReadLine();42         }43     }44 }