How to check how much memory is used by class or struct object in C#

Question

Rajanikant Hawaldar · Answer

Hey Amit can check this, using System; using System.Collections.Generic; using System.IO; using System.Linq; using System.Runtime.Serialization.Formatters.Binary; using System.Text; namespace Main { class Program { class simple { public int a { get ; set ; } } class twostring { public string a { get ; set ; } public string b { get ; set ; } } static void Main( string [] args) { Console.WriteLine( "Size int :{0}" , TestSize int >.SizeOf(1)); Console.WriteLine( "Size long :{0}" , TestSize long >.SizeOf( long .MaxValue)); Console.WriteLine( "Size int?null :{0}" , TestSize int ?>.SizeOf( null )); Console.WriteLine( "Size int? :{0}" , TestSize int ?>.SizeOf(2)); Console.WriteLine( "Size string[10] :{0}" , TestSize string >.SizeOf( "0123456789" )); StringBuilder sb = new StringBuilder(); for ( int i = 0; i sb.Append( "0123456789" ); Console.WriteLine( "Size stringbulder[10*100] :{0}" , TestSize .SizeOf(sb)); sb = new StringBuilder(); for ( int i = 0; i sb.Append( "??????????" ); Console.WriteLine( "Size stringbulder U[10*100] :{0}" , TestSize .SizeOf(sb)); Console.WriteLine( "Size C:simple :{0}" , TestSize .SizeOf( new simple())); Console.WriteLine( "Size C:strings :{0}" , TestSize .SizeOf( new twostring())); Console.WriteLine( "Size C:strings[setted]:{0}" , TestSize .SizeOf( new twostring() { a = "0123456789" , b = "0123456789" })); var arrayint = new int [100]; Console.WriteLine( "Size arrayint[100] :{0}" , TestSize int []>.SizeOf(arrayint)); var arraysimple = new simple[3]; Console.WriteLine( "Size simple[3] :{0}" , TestSize .SizeOf(arraysimple)); var list = new List int >(); Console.WriteLine( "Size list Empty :{0}" , TestSize int >>.SizeOf(list)); for ( int i = 0; i Console.WriteLine( "Size list [100] :{0}" , TestSize int >>.SizeOf(list)); Console.ReadLine(); } } class TestSize { static private int SizeOfObj(Type T, object thevalue) { var type = T; int returnval = 0; if (type.IsValueType) { var nulltype = Nullable.GetUnderlyingType(type); returnval = System.Runtime.InteropServices.Marshal.SizeOf(nulltype ?? type); } else if (thevalue == null ) return 0; else if (thevalue is string ) returnval = Encoding.Default.GetByteCount(thevalue as string ); else if (type.IsArray && type.GetElementType().IsValueType) { returnval = ((Array)thevalue).GetLength(0) * System.Runtime.InteropServices.Marshal.SizeOf(type.GetElementType()); } else if (thevalue is Stream) { Stream thestram = thevalue as Stream; returnval = ( int )thestram.Length; } else if (type.IsSerializable) { try { using (Stream s = new MemoryStream()) { BinaryFormatter formatter = new BinaryFormatter(); formatter.Serialize(s, thevalue); returnval = ( int )s.Length; } } catch { } } else { var fields = type.GetFields(System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance); for ( int i = 0; i { Type t = fields[i].FieldType; Object v = fields[i].GetValue(thevalue); returnval += 4 + SizeOfObj(t, v); } } if (returnval == 0) try { returnval = System.Runtime.InteropServices.Marshal.SizeOf(thevalue); } catch { } return returnval; } static public int SizeOf(T value) { return SizeOfObj( typeof (T), value); } } }

Sachin Singh · Answer

visit https://stackoverflow.com/questions/605621/how-to-get-object-size-in-memory