public override Expression <Func <T, bool> > ToExpression()
{
Expression <Func <T, bool> > leftExpression = left.ToExpression();
Expression <Func <T, bool> > rightExpression = right.ToExpression();
BinaryExpression orExpression = Expression.OrElse(leftExpression.Body, rightExpression.Body);
return(Expression.Lambda <Func <T, bool> >(orExpression, leftExpression.Parameters.First()));
}
public override Expression <Func <T, bool> > ToExpression()
{
Expression <Func <T, bool> > leftExpression = left.ToExpression();
Expression <Func <T, bool> > rightExpression = right.ToExpression();
ParameterExpression param = Expression.Parameter(typeof(T), "x");
BinaryExpression andExpression = Expression.AndAlso(leftExpression.Body, rightExpression.Body);
return(Expression.Lambda <Func <T, bool> >(andExpression, leftExpression.Parameters.First()));
}
public static Expression <Func <ExpressionTreeEF.User, bool> > UserSearch(List <SearchCriteria> criteria)
{
Specification <ExpressionTreeEF.User> includes = Specification <ExpressionTreeEF.User> .All;
foreach (var item in criteria)
{
switch (item.Field)
{
case "FirstName":
{
if (item.Operation == OperationsEnum.ALL)
{
includes = includes.And(new UserFirstNameSpecification(item.Value));
}
else if (item.Operation == OperationsEnum.AND)
{
includes = includes.And(new UserFirstNameSpecification(item.Value));
}
else
{
includes = includes.Or(new UserFirstNameSpecification(item.Value));
}
}
break;
case "LastName":
{
if (item.Operation == OperationsEnum.ALL)
{
includes = includes.And(new UserLastNameSpecification(item.Value));
}
else if (item.Operation == OperationsEnum.AND)
{
includes = includes.And(new UserLastNameSpecification(item.Value));
}
else
{
includes = includes.Or(new UserLastNameSpecification(item.Value));
}
}
break;
default:
throw new Exception();
}
}
return(includes.ToExpression());
}