/// <summary>
/// A more flexible filtering method than Filter(). Filter() will always return materialized items.
/// </summary>
public IEnumerable <TEntityInterface> FilterOrQuery(IEnumerable <TEntityInterface> items, object parameter, Type parameterType)
{
bool preferQuery = items is IQueryable;
// If exists use Filter(IQueryable, TParameter) or Filter(IEnumerable, TParameter)
{
ReadingOption enumerableFilter = () =>
{
var reader = Reflection.RepositoryEnumerableFilterMethod(parameterType);
if (reader == null)
{
return(null);
}
return(() =>
{
_logger.Trace(() => "Filtering using enumerable Filter(items, " + reader.GetParameters()[1].ParameterType.FullName + ")");
Reflection.MaterializeEntityList(ref items);
return (IEnumerable <TEntityInterface>)reader.InvokeEx(_repository.Value, items, parameter);
});
};
ReadingOption queryableFilter = () =>
{
var reader = Reflection.RepositoryQueryableFilterMethod(parameterType);
if (reader == null)
{
return(null);
}
return(() =>
{
_logger.Trace(() => "Filtering using queryable Filter(items, " + reader.GetParameters()[1].ParameterType.FullName + ")");
var query = Reflection.AsQueryable(items);
return (IEnumerable <TEntityInterface>)reader.InvokeEx(_repository.Value, query, parameter);
});
};
ReadingOptions options;
if (!preferQuery)
{
options = new ReadingOptions {
enumerableFilter, queryableFilter
}
}
;
else
{
options = new ReadingOptions {
queryableFilter, enumerableFilter
}
};
var readingMethod = options.FirstOptionOrNull();
if (readingMethod != null)
{
return(readingMethod());
}
}
// If the parameter is FilterAll, unless explicitly implemented above, return all
if (typeof(FilterAll).IsAssignableFrom(parameterType))
{
_logger.Trace(() => "Filtering all items returned.");
return(items);
}
// If the parameter is a generic filter, unless explicitly implemented above, execute it
if (parameterType == typeof(FilterCriteria))
{
_logger.Trace(() => "Filtering using generic filter");
return(ExecuteGenericFilter(new[] { (FilterCriteria)parameter }, preferQuery, items));
}
if (typeof(IEnumerable <FilterCriteria>).IsAssignableFrom(parameterType))
{
_logger.Trace(() => "Filtering using generic filters");
return(ExecuteGenericFilter((IEnumerable <FilterCriteria>)parameter, preferQuery, items));
}
// If the parameter is a generic property filter, unless explicitly implemented above, use queryable items.Where(property filter)
if (typeof(IEnumerable <PropertyFilter>).IsAssignableFrom(parameterType))
{
_logger.Trace(() => "Reading using items.AsQueryable().Where(property filter");
// The filterExpression must use EntityType or EntityNavigationType, depending on the provided query.
var itemType = items.GetType().GetInterface("IEnumerable`1").GetGenericArguments()[0];
var filterExpression = _genericFilterHelper.ToExpression((IEnumerable <PropertyFilter>)parameter, itemType);
if (Reflection.IsQueryable(items))
{
var query = Reflection.AsQueryable(items);
return(Reflection.Where(query, filterExpression));
}
else
{
return(Reflection.Where(items, filterExpression.Compile()));
}
}
// If the parameter is a filter expression, unless explicitly implemented above, use queryable items.Where(parameter)
if (Reflection.IsPredicateExpression(parameterType))
{
_logger.Trace(() => "Filtering using items.AsQueryable().Where(" + parameterType.Name + ")");
var query = Reflection.AsQueryable(items);
return(Reflection.Where(query, (Expression)parameter));
}
// If the parameter is a filter function, unless explicitly implemented above, use materialized items.Where(parameter)
if (typeof(Func <TEntityInterface, bool>).IsAssignableFrom(parameterType))
{
_logger.Trace(() => "Filtering using items.Where(" + parameterType.Name + ")");
var filterFunction = parameter as Func <TEntityInterface, bool>;
Reflection.MaterializeEntityList(ref items);
if (filterFunction != null)
{
return(items.Where(filterFunction));
}
}
// If the parameter is a IEnumarable<Guid>, it will be interpreted as filter by IDs.
if (typeof(IEnumerable <Guid>).IsAssignableFrom(parameterType))
{
_logger.Trace(() => "Filtering using items.Where(item => guids.Contains(item.ID))");
if (!(parameter is List <Guid>))
{
parameter = ((IEnumerable <Guid>)parameter).ToList();
}
if (items is IQueryable <TEntityInterface> ) // Use queryable Where function with bool expression instead of bool function.
{
// The query is built by reflection to avoid an obscure problem with complex query in NHibernate:
// using generic parameter TEntityInterface or IEntity for a query parameter fails with exception on some complex scenarios.
var filterPredicateParameter = Expression.Parameter(Reflection.EntityType, "item");
var filterPredicate = Expression.Lambda(
Expression.Call(
Expression.Constant(parameter),
typeof(List <Guid>).GetMethod("Contains"),
new[] { Expression.Property(filterPredicateParameter, "ID") }),
filterPredicateParameter);
return(Reflection.Where((IQueryable <TEntityInterface>)items, EFExpression.OptimizeContains(filterPredicate)));
}
return(items.Where(item => ((List <Guid>)parameter).Contains(item.ID)));
}
string errorMessage = $"{EntityName} does not implement a filter with parameter {parameterType.FullName}.";
if (Reflection.RepositoryLoadWithParameterMethod(parameterType) != null)
{
errorMessage += " There is a loader method with this parameter implemented: Try reordering filters to use the " + parameterType.Name + " first.";
throw new ClientException(errorMessage);
}
else
{
throw new FrameworkException(errorMessage);
}
}
public LambdaExpression ToExpression(IEnumerable <PropertyFilter> propertyFilters, Type parameterType)
{
ParameterExpression parameter = Expression.Parameter(parameterType, "p");
if (propertyFilters == null || !propertyFilters.Any())
{
return(Expression.Lambda(Expression.Constant(true), parameter));
}
Expression resultCondition = null;
foreach (var filter in propertyFilters)
{
if (string.IsNullOrEmpty(filter.Property))
{
continue;
}
Expression memberAccess = null;
foreach (var property in filter.Property.Split('.'))
{
var parentExpression = memberAccess ?? (Expression)parameter;
if (parentExpression.Type.GetProperty(property) == null)
{
throw new ClientException("Invalid generic filter parameter: Type '" + parentExpression.Type.FullName + "' does not have property '" + property + "'.");
}
memberAccess = Expression.Property(parentExpression, property);
}
// Change the type of the parameter 'value'. It is necessary for comparisons.
bool propertyIsNullableValueType = memberAccess.Type.IsGenericType && memberAccess.Type.GetGenericTypeDefinition() == typeof(Nullable <>);
Type propertyBasicType = propertyIsNullableValueType ? memberAccess.Type.GetGenericArguments().Single() : memberAccess.Type;
ConstantExpression constant;
// Operations 'equal' and 'notequal' are supported for backward compatibility.
if (new[] { "equals", "equal", "notequals", "notequal", "greater", "greaterequal", "less", "lessequal" }.Contains(filter.Operation, StringComparer.OrdinalIgnoreCase))
{
// Constant value should be of same type as the member it is compared to.
object convertedValue;
if (filter.Value == null || propertyBasicType.IsInstanceOfType(filter.Value))
{
convertedValue = filter.Value;
}
// Guid object's type was not automatically recognized when deserializing from JSON:
else if (propertyBasicType == typeof(Guid) && filter.Value is string)
{
convertedValue = Guid.Parse(filter.Value.ToString());
}
// DateTime object's type was not automatically recognized when deserializing from JSON:
else if (propertyBasicType == typeof(DateTime) && filter.Value is string)
{
convertedValue = ParseJsonDateTime((string)filter.Value, filter.Property, propertyBasicType);
}
else if ((propertyBasicType == typeof(decimal) || propertyBasicType == typeof(int)) && filter.Value is string)
{
throw new FrameworkException($"Invalid JSON format of {propertyBasicType.Name} property '{filter.Property}'. Numeric value should not be passed as a string in JSON serialized object.");
}
else
{
convertedValue = Convert.ChangeType(filter.Value, propertyBasicType);
}
if (convertedValue == null && memberAccess.Type.IsValueType && !propertyIsNullableValueType)
{
Type nullableMemberType = typeof(Nullable <>).MakeGenericType(memberAccess.Type);
memberAccess = Expression.Convert(memberAccess, nullableMemberType);
}
constant = Expression.Constant(convertedValue, memberAccess.Type);
}
else if (new[] { "startswith", "endswith", "contains", "notcontains" }.Contains(filter.Operation, StringComparer.OrdinalIgnoreCase))
{
// Constant value should be string.
constant = Expression.Constant(filter.Value.ToString(), typeof(string));
}
else if (new[] { "datein", "datenotin" }.Contains(filter.Operation, StringComparer.OrdinalIgnoreCase))
{
constant = null;
}
else if (new[] { "in", "notin" }.Contains(filter.Operation, StringComparer.OrdinalIgnoreCase))
{
if (filter.Value == null)
{
throw new ClientException($"Invalid generic filter parameter for operation '{filter.Operation}' on {propertyBasicType.Name} property '{filter.Property}'."
+ $" The provided value is null, instead of an Array.");
}
// The list element should be of same type as the member it is compared to.
var parameterMismatchInfo = new Lazy <string>(() =>
$"Invalid generic filter parameter for operation '{filter.Operation}' on {propertyBasicType.Name} property '{filter.Property}'."
+ $" The provided value type is '{filter.Value.GetType()}', instead of an Array of {propertyBasicType.Name}.");
if (!(filter.Value is IEnumerable))
{
throw new ClientException(parameterMismatchInfo.Value);
}
var list = (IEnumerable)filter.Value;
// Guid object's type was not automatically recognized when deserializing from JSON:
if (propertyBasicType == typeof(Guid) && list is IEnumerable <string> )
{
list = ((IEnumerable <string>)list).Select(s => !string.IsNullOrEmpty(s) ? (Guid?)Guid.Parse(s) : null).ToList();
}
// DateTime object's type was not automatically recognized when deserializing from JSON:
if (propertyBasicType == typeof(DateTime) && list is IEnumerable <string> )
{
list = ((IEnumerable <string>)list).Select(s => ParseJsonDateTime(s, filter.Property, propertyBasicType)).ToList();
}
// Adjust the list element type to exactly match the property type:
if (GetElementType(list) != memberAccess.Type)
{
if (list is IList && ((IList)list).Count == 0)
{
list = EmptyList(memberAccess.Type);
}
else if (propertyBasicType == typeof(Guid))
{
AdjustListTypeNullable <Guid>(ref list, propertyIsNullableValueType);
}
else if (propertyBasicType == typeof(DateTime))
{
AdjustListTypeNullable <DateTime>(ref list, propertyIsNullableValueType);
}
else if (propertyBasicType == typeof(int))
{
AdjustListTypeNullable <int>(ref list, propertyIsNullableValueType);
}
else if (propertyBasicType == typeof(decimal))
{
AdjustListTypeNullable <decimal>(ref list, propertyIsNullableValueType);
}
if (!(GetElementType(list).IsAssignableFrom(memberAccess.Type)))
{
throw new ClientException(parameterMismatchInfo.Value);
}
}
constant = Expression.Constant(list, list.GetType());
}
else
{
throw new ClientException($"Unsupported generic filter operation '{filter.Operation}' on a property.");
}
Expression expression;
switch (filter.Operation.ToLower())
{
case "equals":
case "equal":
if (propertyBasicType == typeof(Guid) && constant.Value is Guid constantIdEquals)
{
// Using a different expression instead of the constant, to force Entity Framework to
// use query parameter instead of hardcoding the constant value (literal) into the generated query.
// Query with parameter will allow cache reuse for both EF LINQ compiler and database SQL compiler.
if (memberAccess.Type == typeof(Guid?))
{
Expression <Func <Guid?> > idLambda = () => constantIdEquals;
expression = Expression.Equal(memberAccess, idLambda.Body);
}
else
{
Expression <Func <Guid> > idLambda = () => constantIdEquals;
expression = Expression.Equal(memberAccess, idLambda.Body);
}
}
else if (propertyBasicType == typeof(string) && constant.Value != null)
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("EqualsCaseInsensitive"), memberAccess, constant);
}
else
{
expression = Expression.Equal(memberAccess, constant);
}
break;
case "notequals":
case "notequal":
if (propertyBasicType == typeof(Guid) && constant.Value is Guid constantIdNotEquals)
{
// Using a different expression instead of the constant, to force Entity Framework to
// use query parameter instead of hardcoding the constant value (literal) into the generated query.
// Query with parameter will allow cache reuse for both EF LINQ compiler and database SQL compiler.
Expression <Func <object> > idLambda = () => constantIdNotEquals;
expression = Expression.NotEqual(memberAccess, Expression.Convert(idLambda.Body, memberAccess.Type));
}
else if (propertyBasicType == typeof(string) && constant.Value != null)
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("NotEqualsCaseInsensitive"), memberAccess, constant);
}
else
{
expression = Expression.NotEqual(memberAccess, constant);
}
break;
case "greater":
if (propertyBasicType == typeof(string))
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("IsGreaterThen"), memberAccess, constant);
}
else if (propertyBasicType == typeof(Guid))
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("GuidIsGreaterThan"), memberAccess, constant);
}
else
{
expression = Expression.GreaterThan(memberAccess, constant);
}
break;
case "greaterequal":
if (propertyBasicType == typeof(string))
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("IsGreaterThenOrEqual"), memberAccess, constant);
}
else if (propertyBasicType == typeof(Guid))
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("GuidIsGreaterThanOrEqual"), memberAccess, constant);
}
else
{
expression = Expression.GreaterThanOrEqual(memberAccess, constant);
}
break;
case "less":
if (propertyBasicType == typeof(string))
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("IsLessThen"), memberAccess, constant);
}
else if (propertyBasicType == typeof(Guid))
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("GuidIsLessThan"), memberAccess, constant);
}
else
{
expression = Expression.LessThan(memberAccess, constant);
}
break;
case "lessequal":
if (propertyBasicType == typeof(string))
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("IsLessThenOrEqual"), memberAccess, constant);
}
else if (propertyBasicType == typeof(Guid))
{
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("GuidIsLessThanOrEqual"), memberAccess, constant);
}
else
{
expression = Expression.LessThanOrEqual(memberAccess, constant);
}
break;
case "startswith":
case "endswith":
{
Expression stringMember;
if (propertyBasicType == typeof(string))
{
stringMember = memberAccess;
}
else
{
var castMethod = typeof(DatabaseExtensionFunctions).GetMethod("CastToString", new[] { memberAccess.Type });
if (castMethod == null)
{
throw new FrameworkException("Generic filter operation '" + filter.Operation + "' is not supported on property type '" + propertyBasicType.Name + "'. There is no overload of 'DatabaseExtensionFunctions.CastToString' function for the type.");
}
stringMember = Expression.Call(castMethod, memberAccess);
}
string dbMethodName = filter.Operation.Equals("startswith", StringComparison.OrdinalIgnoreCase) ? "StartsWithCaseInsensitive" : "EndsWithCaseInsensitive";
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod(dbMethodName), stringMember, constant);
break;
}
case "contains":
case "notcontains":
{
Expression stringMember;
if (propertyBasicType == typeof(string))
{
stringMember = memberAccess;
}
else
{
var castMethod = typeof(DatabaseExtensionFunctions).GetMethod("CastToString", new[] { memberAccess.Type });
if (castMethod == null)
{
throw new FrameworkException("Generic filter operation '" + filter.Operation + "' is not supported on property type '" + propertyBasicType.Name + "'. There is no overload of 'DatabaseExtensionFunctions.CastToString' function for the type.");
}
stringMember = Expression.Call(castMethod, memberAccess);
}
expression = Expression.Call(typeof(DatabaseExtensionFunctions).GetMethod("ContainsCaseInsensitive"), stringMember, constant);
if (filter.Operation.Equals("notcontains", StringComparison.OrdinalIgnoreCase))
{
expression = Expression.Not(expression);
}
break;
}
case "datein":
case "datenotin":
{
if (propertyBasicType != typeof(DateTime))
{
throw new FrameworkException("Generic filter operation '" + filter.Operation
+ "' is not supported for property type '" + propertyBasicType.Name + "'. Expected property type 'DateTime'.");
}
var match = DateRangeRegex.Match(filter.Value.ToString());
if (!match.Success)
{
throw new FrameworkException("Generic filter operation '" + filter.Operation + "' expects format 'yyyy-mm-dd', 'yyyy-mm' or 'yyyy'. Value '" + filter.Value + "' has invalid format.");
}
DateTime?date1, date2;
int year = int.Parse(match.Groups["y"].Value);
if (string.IsNullOrEmpty(match.Groups["m"].Value))
{
date1 = new DateTime(year, 1, 1);
date2 = date1.Value.AddYears(1);
}
else
{
int month = int.Parse(match.Groups["m"].Value);
if (string.IsNullOrEmpty(match.Groups["d"].Value))
{
date1 = new DateTime(year, month, 1);
date2 = date1.Value.AddMonths(1);
}
else
{
int day = int.Parse(match.Groups["d"].Value);
date1 = new DateTime(year, month, day);
date2 = date1.Value.AddDays(1);
}
}
expression = Expression.AndAlso(
Expression.GreaterThanOrEqual(memberAccess, Expression.Constant(date1, typeof(DateTime?))),
Expression.LessThan(memberAccess, Expression.Constant(date2, typeof(DateTime?))));
if (filter.Operation.Equals("datenotin", StringComparison.OrdinalIgnoreCase))
{
expression = Expression.Not(expression);
}
break;
}
case "in":
case "notin":
{
Type collectionElement = GetElementType(constant.Type);
Expression convertedMemberAccess = memberAccess.Type != collectionElement
? Expression.Convert(memberAccess, collectionElement)
: memberAccess;
Type collectionBasicType = typeof(IQueryable).IsAssignableFrom(constant.Type)
? typeof(Queryable) : typeof(Enumerable);
var containsMethod = collectionBasicType.GetMethods()
.Single(m => m.Name == "Contains" && m.GetParameters().Length == 2)
.MakeGenericMethod(collectionElement);
expression = EFExpression.OptimizeContains(Expression.Call(containsMethod, constant, convertedMemberAccess));
if (filter.Operation.Equals("notin", StringComparison.OrdinalIgnoreCase))
{
expression = Expression.Not(expression);
}
break;
}
default:
throw new FrameworkException("Unsupported generic filter operation '" + filter.Operation + "' on property (while generating expression).");
}
resultCondition = resultCondition != null?Expression.AndAlso(resultCondition, expression) : expression;
}
return(Expression.Lambda(resultCondition, parameter));
}
public IEnumerable <TEntityInterface> Read(object parameter, Type parameterType, bool preferQuery)
{
// Use Load(parameter), Query(parameter) or Filter(Query(), parameter), if any of the options exist.
ReadingOption loaderWithParameter = () =>
{
var reader = Reflection.RepositoryLoadWithParameterMethod(parameterType);
if (reader == null)
{
return(null);
}
return(() =>
{
_logger.Trace(() => "Reading using Load(" + reader.GetParameters()[0].ParameterType.FullName + ")");
return (IEnumerable <TEntityInterface>)reader.InvokeEx(_repository.Value, parameter);
});
};
ReadingOption queryWithParameter = () =>
{
var reader = Reflection.RepositoryQueryWithParameterMethod(parameterType);
if (reader == null)
{
return(null);
}
return(() =>
{
_logger.Trace(() => "Reading using Query(" + reader.GetParameters()[0].ParameterType.FullName + ")");
return (IEnumerable <TEntityInterface>)reader.InvokeEx(_repository.Value, parameter);
});
};
ReadingOption queryThenQueryableFilter = () =>
{
if (Reflection.RepositoryQueryMethod == null)
{
return(null);
}
var reader = Reflection.RepositoryQueryableFilterMethod(parameterType);
if (reader == null)
{
return(null);
}
return(() =>
{
_logger.Trace(() => "Reading using queryable Filter(Query(), " + reader.GetParameters()[1].ParameterType.FullName + ")");
var query = Reflection.RepositoryQueryMethod.InvokeEx(_repository.Value);
return (IEnumerable <TEntityInterface>)reader.InvokeEx(_repository.Value, query, parameter);
});
};
ReadingOption queryAll = () =>
{
if (!typeof(FilterAll).IsAssignableFrom(parameterType))
{
return(null);
}
var reader = Reflection.RepositoryQueryMethod;
if (reader == null)
{
return(null);
}
return(() =>
{
_logger.Trace(() => "Reading using Query()");
return (IEnumerable <TEntityInterface>)reader.InvokeEx(_repository.Value);
});
};
{
ReadingOptions options;
if (!preferQuery)
{
options = new ReadingOptions {
loaderWithParameter, queryWithParameter, queryThenQueryableFilter
}
}
;
else
{
options = new ReadingOptions {
queryWithParameter, queryThenQueryableFilter, queryAll, loaderWithParameter
}
};
var readingMethod = options.FirstOptionOrNull();
if (readingMethod != null)
{
return(readingMethod());
}
}
// If the parameter is FilterAll, unless explicitly implemented above, use Load() or Query() if any option exists
if (typeof(FilterAll).IsAssignableFrom(parameterType))
{
var options = new ReadingOptions {
() => {
var reader = Reflection.RepositoryLoadMethod;
if (reader == null)
{
return(null);
}
return(() => {
_logger.Trace(() => "Reading using Load()");
return (IEnumerable <TEntityInterface>)reader.InvokeEx(_repository.Value);
});
},
() => {
var reader = Reflection.RepositoryQueryMethod;
if (reader == null)
{
return(null);
}
return(() => {
_logger.Trace(() => "Reading using Query()");
return (IEnumerable <TEntityInterface>)reader.InvokeEx(_repository.Value);
});
}
};
if (preferQuery)
{
options.Reverse();
}
var readingMethod = options.FirstOptionOrNull();
if (readingMethod != null)
{
return(readingMethod());
}
}
// If the parameter is a generic filter, unless explicitly implemented above, execute it
if (parameterType == typeof(FilterCriteria))
{
_logger.Trace(() => "Reading using generic filter");
return(ExecuteGenericFilter(new[] { (FilterCriteria)parameter }, preferQuery));
}
if (typeof(IEnumerable <FilterCriteria>).IsAssignableFrom(parameterType))
{
_logger.Trace(() => "Reading using generic filters");
return(ExecuteGenericFilter((IEnumerable <FilterCriteria>)parameter, preferQuery));
}
// If the parameter is a generic property filter, unless explicitly implemented above, use Query().Where(property filter)
if (Reflection.RepositoryQueryMethod != null && typeof(IEnumerable <PropertyFilter>).IsAssignableFrom(parameterType))
{
_logger.Trace(() => "Reading using Query().Where(property filter");
var query = (IQueryable <TEntityInterface>)Reflection.RepositoryQueryMethod.InvokeEx(_repository.Value);
var filterExpression = _genericFilterHelper.ToExpression((IEnumerable <PropertyFilter>)parameter, Reflection.EntityNavigationType);
return(Reflection.Where(query, filterExpression));
}
// If the parameter is a filter expression, unless explicitly implemented above, use Query().Where(parameter)
if (Reflection.RepositoryQueryMethod != null && Reflection.IsPredicateExpression(parameterType))
{
_logger.Trace(() => "Reading using Query().Where(" + parameterType.Name + ")");
var query = (IQueryable <TEntityInterface>)Reflection.RepositoryQueryMethod.InvokeEx(_repository.Value);
return(Reflection.Where(query, (Expression)parameter));
}
// If the parameter is a IEnumarable<Guid>, it will be interpreted as filter by IDs.
if (Reflection.RepositoryQueryMethod != null && typeof(IEnumerable <Guid>).IsAssignableFrom(parameterType))
{
_logger.Trace(() => "Reading using Query().Where(item => guids.Contains(item.ID))");
if (!(parameter is List <Guid>))
{
parameter = ((IEnumerable <Guid>)parameter).ToList();
}
var query = (IQueryable <TEntityInterface>)Reflection.RepositoryQueryMethod.InvokeEx(_repository.Value);
// The query is built by reflection to avoid an obscure problem with complex query in NHibernate:
// using generic parameter TEntityInterface or IEntity for a query parameter fails with exception on some complex scenarios.
var filterPredicateParameter = Expression.Parameter(Reflection.EntityType, "item");
var filterPredicate = Expression.Lambda(
Expression.Call(
Expression.Constant(parameter),
typeof(List <Guid>).GetMethod("Contains"),
new[] { Expression.Property(filterPredicateParameter, "ID") }),
filterPredicateParameter);
return(Reflection.Where(query, EFExpression.OptimizeContains(filterPredicate)));
}
// It there is only enumerable filter available, use inefficient loader with in-memory filtering: Filter(Load(), parameter)
{
var reader = Reflection.RepositoryEnumerableFilterMethod(parameterType);
if (reader != null)
{
IEnumerable <TEntityInterface> items;
try
{
items = Read(null, typeof(FilterAll), preferQuery: false);
}
catch (FrameworkException)
{
items = null;
}
if (items != null)
{
_logger.Trace(() => "Reading using enumerable Filter(all, " + reader.GetParameters()[1].ParameterType.FullName + ")");
Reflection.MaterializeEntityList(ref items);
return((IEnumerable <TEntityInterface>)reader.InvokeEx(_repository.Value, items, parameter));
}
}
}
throw new FrameworkException($"{EntityName} does not implement a loader, a query or a filter with parameter {parameterType.FullName}.");
}
