获取动态类型变量的属性值

public static object GetProperty(object o, string member)
{
    if(o == null) throw new ArgumentNullException("o");
    if(member == null) throw new ArgumentNullException("member");
    Type scope = o.GetType();
    IDynamicMetaObjectProvider provider = o as IDynamicMetaObjectProvider;
    if(provider != null)
    {
        ParameterExpression param = Expression.Parameter(typeof(object));
        DynamicMetaObject mobj = provider.GetMetaObject(param);
        GetMemberBinder binder = (GetMemberBinder)Microsoft.CSharp.RuntimeBinder.Binder.GetMember(0, member, scope, new CSharpArgumentInfo[]{CSharpArgumentInfo.Create(0, null)});
        DynamicMetaObject ret = mobj.BindGetMember(binder);
        BlockExpression final = Expression.Block(
            Expression.Label(CallSiteBinder.UpdateLabel),
            ret.Expression
        );
        LambdaExpression lambda = Expression.Lambda(final, param);
        Delegate del = lambda.Compile();
        return del.DynamicInvoke(o);
    }else{
        return o.GetType().GetProperty(member, BindingFlags.Public | BindingFlags.Instance).GetValue(o, null);
    }
}