コード例 #1
0
        protected virtual DbLambda VisitLambda(DbLambda lambda)
        {
            EntityUtil.CheckArgumentNull(lambda, "lambda");

            DbLambda result = lambda;
            IList <DbVariableReferenceExpression> newFormals = this.VisitList(lambda.Variables, varRef =>
            {
                TypeUsage newVarType = this.VisitTypeUsage(varRef.ResultType);
                if (!object.ReferenceEquals(varRef.ResultType, newVarType))
                {
                    return(CqtBuilder.Variable(newVarType, varRef.VariableName));
                }
                else
                {
                    return(varRef);
                }
            }
                                                                              );

            this.EnterScope(newFormals.ToArray()); // ToArray: Don't pass the List instance directly to OnEnterScope
            DbExpression newBody = this.VisitExpression(lambda.Body);

            this.ExitScope();

            if (!object.ReferenceEquals(lambda.Variables, newFormals) ||
                !object.ReferenceEquals(lambda.Body, newBody))
            {
                result = CqtBuilder.Lambda(newBody, newFormals);
            }
            return(result);
        }