private static Expression GenerateExpressionQueryTree(QueryExpression queryExpression)
{
Expression expressionTree = null;
if (null == queryExpression)
{
throw new ArgumentNullException("QueryExpression can't be null!");
}
else
{
if (null != queryExpression.LeftQueryExpression)
{
LogicalCalculationQueryExpression logicalCalculationQueryExpression = (LogicalCalculationQueryExpression)queryExpression;
if (logicalCalculationQueryExpression.Logicalcalculation == (int)LogicalCalculationEnum.And)
{
return(Expression.And(GenerateExpressionQueryTree(queryExpression.LeftQueryExpression), GenerateExpressionQueryTree(queryExpression.RightQueryExpression)));
}
else if (logicalCalculationQueryExpression.Logicalcalculation == (int)LogicalCalculationEnum.Or)
{
return(Expression.Or(GenerateExpressionQueryTree(queryExpression.LeftQueryExpression), GenerateExpressionQueryTree(queryExpression.RightQueryExpression)));
}
}
else
{
return(Expression.Constant(((FieldQueryExpression)queryExpression).Result));
}
}
return(expressionTree);
}
private static QueryExpression LogicalCalculation(QueryExpression left, QueryExpression right, LogicalCalculationEnum logicalCalculationEnum)
{
QueryExpression queryExpression = null;
if (logicalCalculationEnum == LogicalCalculationEnum.And)
{
queryExpression = new LogicalCalculationQueryExpression(left, right, LogicalCalculationEnum.And);
}
else if (logicalCalculationEnum == LogicalCalculationEnum.Or)
{
queryExpression = new LogicalCalculationQueryExpression(left, right, LogicalCalculationEnum.Or);
}
return(queryExpression);
}
public static LogicalCalculationQueryExpression CreateLogicalCalculationQueryExpression(QueryExpression left, QueryExpression right, LogicalCalculationEnum logicalCalculationEnum)
{
LogicalCalculationQueryExpression logicalCalculationQueryExpression = new LogicalCalculationQueryExpression(left, right, logicalCalculationEnum);
return(logicalCalculationQueryExpression);
}