SqlSugar.ResolveExpress.IsNullOrEmpty C# (CSharp) Méthode

        private string IsNullOrEmpty(string methodName, MethodCallExpression mce, bool isTure)
        {
            MemberType leftType = MemberType.None;
            MemberType rightType = MemberType.None;
            var isConstant = mce.Arguments.First().NodeType == ExpressionType.Constant;
            var left = CreateSqlElements(mce.Object, ref leftType,true);
            var right = mce.Arguments[0].NodeType.IsIn(ExpressionType.Constant, ExpressionType.MemberAccess) ? CreateSqlElements(mce.Arguments[0], ref rightType, true) : Expression.Lambda(mce.Arguments[0]).Compile().DynamicInvoke().ObjToString();
            if (right == "null")
            {
                right = "";
            }
            if (isConstant)
            {
                var oldLeft = AddParas(ref left, right);
                if (isTure)
                {
                    return string.Format("(" + SqlSugarTool.ParSymbol + "{0} is null OR " + SqlSugarTool.ParSymbol + "{0}='' )", left);
                }
                else
                {
                    return string.Format("(" + SqlSugarTool.ParSymbol + "{0} is not null AND " + SqlSugarTool.ParSymbol + "{0}<>'' )", left);
                }
            }
            else
            {
                if (isTure)
                {
                    if (rightType == MemberType.Key)
                    {
                        return string.Format("({0} is null OR {0}='' )", right.ToSqlFilter());
                    }
                    else
                    {
                        return string.Format("('{0}' is null OR '{0}'='' )", right.ToSqlFilter());
                    }
                }
                else
                {
                    if (rightType == MemberType.Key)
                    {
                        return string.Format("({0} is not null AND {0}<>'' )", right.ToSqlFilter());
                    }
                    else
                    {

                        return string.Format("('{0}' is not null AND '{0}'<>'' )", right.ToSqlFilter());
                    }
                }

            }
        }