Generate Get Hash Code with TypeBuilder - CSharp System

CSharp examples for System:Hash

  1. HOME
  2. CSharp
  3. System
  4. Hash

Description

Generate Get Hash Code with TypeBuilder

Demo Code


using System.Threading;
using System.Reflection.Emit;
using System.Reflection;
using System.Linq;
using System.Diagnostics.CodeAnalysis;
using System.Collections.Generic;
using System;//  w  ww .  j a  v a2 s .  c o m

public class Main{
        static void GenerateGetHashCode(TypeBuilder tb, FieldInfo[] fields)
        {
            MethodBuilder mb = tb.DefineMethod("GetHashCode",
                MethodAttributes.Public | MethodAttributes.ReuseSlot |
                MethodAttributes.Virtual | MethodAttributes.HideBySig,
                typeof(int), Type.EmptyTypes);
            ILGenerator gen = mb.GetILGenerator();
            gen.Emit(OpCodes.Ldc_I4_0);
            foreach (FieldInfo field in fields)
            {
                Type ft = field.FieldType;
                Type ct = typeof(EqualityComparer<>).MakeGenericType(ft);
                gen.EmitCall(OpCodes.Call, ct.GetMethod("get_Default"), null);
                gen.Emit(OpCodes.Ldarg_0);
                gen.Emit(OpCodes.Ldfld, field);
                gen.EmitCall(OpCodes.Callvirt, ct.GetMethod("GetHashCode", new Type[] { ft }), null);
                gen.Emit(OpCodes.Xor);
            }
            gen.Emit(OpCodes.Ret);
        }
}

Related Tutorials