public IQueryable <TEntity> Apply(IQueryable <TEntity> query)
{
var terms = GetValidTerms().ToArray();
if (!terms.Any())
{
terms = GetTermsFromModel().Where(t => t.Default).ToArray();
}
if (!terms.Any())
{
return(query);
}
var modifiedQuery = query;
var useThenBy = false;
foreach (var term in terms)
{
var propertyInfo = ExpressionHelper
.GetPropertyInfo <TEntity>(term.EntityName ?? term.Name);
var obj = ExpressionHelper.Parameter <TEntity>();
// Build the LINQ expression backwards:
// query = query.OrderBy(x => x.Property);
// x => x.Property
var key = ExpressionHelper
.GetPropertyExpression(obj, propertyInfo);
var keySelector = ExpressionHelper
.GetLambda(typeof(TEntity), propertyInfo.PropertyType, obj, key);
// query.OrderBy/ThenBy[Descending](x => x.Property)
modifiedQuery = ExpressionHelper
.CallOrderByOrThenBy(
modifiedQuery, useThenBy, term.Descending, propertyInfo.PropertyType, keySelector);
useThenBy = true;
}
return(modifiedQuery);
}
public IQueryable <TEntity> Apply(IQueryable <TEntity> query)
{
var terms = GetValidTerms().ToArray();
if (!terms.Any())
{
return(query);
}
var modifiedQuery = query;
foreach (var term in terms)
{
var propertyInfo = ExpressionHelper
.GetPropertyInfo <TEntity>(term.EntityName ?? term.Name);
var obj = ExpressionHelper.Parameter <TEntity>();
// Build up the LINQ expression backwards:
// query = query.Where(x => x.Property == "Value");
// x.Property
var left = ExpressionHelper.GetPropertyExpression(obj, propertyInfo);
// "Value"
var right = term.ExpressionProvider.GetValue(term.Value);
// x.Property == "Value"
var comparisonExpression = term.ExpressionProvider
.GetComparison(left, term.Operator, right);
// x => x.Property == "Value"
var lambdaExpression = ExpressionHelper
.GetLambda <TEntity, bool>(obj, comparisonExpression);
// query = query.Where...
modifiedQuery = ExpressionHelper.CallWhere(modifiedQuery, lambdaExpression);
}
return(modifiedQuery);
}
