public Func <TEntity, bool> GenerateExpression <T>(
Expression <Func <TEntity, T> > fieldExpression,
T value,
Operator filterOperator,
bool caseSensitive = true)
{
BuiltExpression expression = BuildExpression(fieldExpression, value, filterOperator, caseSensitive);
var result = Expression.Lambda <Func <TEntity, bool> >(expression.Condition, expression.Parameter);
return(result.Compile());
}
private Expression <Func <TEntity, bool> > GetResultExpression(IExpressionCondition <TEntity>[] filterConditions, ParameterExpression parameter, Expression <Func <TEntity, bool> > resultExpression)
{
var visitor = new ParameterVisitor(parameter);
foreach (IExpressionCondition <TEntity> condition in filterConditions)
{
BuiltExpression expression = BuildExpression(condition.Field, condition.Value, condition.Operator, condition.CaseSensitive);
visitor.AddParamToReplace(expression.Parameter);
if (resultExpression == null)
{
resultExpression = Expression.Lambda <Func <TEntity, bool> >(visitor.Visit(expression.Condition), parameter);
continue;
}
var exp = Expression.And(resultExpression.Body, visitor.Visit(expression.Condition));
resultExpression = Expression.Lambda <Func <TEntity, bool> >(exp, parameter);
}
return(resultExpression);
}
