快速动态访问属性

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public static class EmitDynamicProperty

{

    private static ConcurrentDictionary<string, Delegate> action = new ConcurrentDictionary<string, Delegate>();

    public static TRet DynamicGetProperty<TRet>(this object obj, string propertyName)

    {

        var type = obj.GetType();

        string key = string.Concat(type.FullName, "_", propertyName);

        var gater = action.GetOrAdd(key, k =>

        {

            var method = type.GetProperty(propertyName).GetGetMethod();

 

            var dynamicMethod = new DynamicMethod(string.Empty, typeof(TRet), new Type[] { typeof(object) });

 

            var ilGen = dynamicMethod.GetILGenerator();

            ilGen.Emit(OpCodes.Ldarg_0);

            ilGen.Emit(OpCodes.Castclass, type);

            ilGen.Emit(OpCodes.Callvirt, method);

            if (method.ReturnType.IsValueType && (!typeof(TRet).IsValueType))

            {

                ilGen.Emit(OpCodes.Box, method.ReturnType);

            }

            ilGen.Emit(OpCodes.Ret);

 

            return dynamicMethod.CreateDelegate(typeof(Func<object, TRet>));

 

        });

 

        return ((Func<object, TRet>)gater)(obj);

 

    }

}