protected Type GetCollectionElementType(ParsedPropertyElement collectionElement)
{
var types = collectionElement.PropertyInfo.PropertyType.GetGenericArguments();
if (types.Length == 1)
{
return(types[0]);
}
throw new DynamicQueryException($"Unsupported collection type {collectionElement.PropertyInfo.Name} of collection {collectionElement.PropertyName}");
}
protected ExpressionPart CreateExpressionPart(Type lastCollectionElementType, Queue <ParsedPropertyElement> elements, int index, ParameterExpression rootParameter)
{
ParameterExpression collectionLambdaParameter = index == 0 && rootParameter != null
? rootParameter
: Expression.Parameter(lastCollectionElementType, "p" + index);
ParsedPropertyElement element;
MemberExpression memberAccess = null;
ParsedPropertyElement collectionElement = null;
while (true)
{
element = elements.Dequeue();
if (element.PropertyType == PropertyType.Collection)
{
collectionElement = element;
}
if (element.PropertyType == PropertyType.CollectionFunction)
{
break;
}
memberAccess = Expression.MakeMemberAccess(collectionLambdaParameter, element.PropertyInfo);
if (elements.Count == 0)
{
break;
}
var nextItem = elements.Peek();
if (element.PropertyType == PropertyType.Collection && nextItem.PropertyType != PropertyType.CollectionFunction)
{
break;
}
}
return(new ExpressionPart
{
CollectionElement = collectionElement,
LastPartElement = element,
MemberAccess = memberAccess,
Parameter = collectionLambdaParameter
});
}
public ParsedPropertyPath ParsePropertyOfType(string propertyPath, Type entityType)
{
if (string.IsNullOrWhiteSpace(propertyPath))
{
throw new DynamicQueryException("Path to property can not be null or empty");
}
var normalizedPath = propertyPath.ToLower();
var parsedPropertyPath = new ParsedPropertyPath(normalizedPath);
var pathElements = normalizedPath.Split('.');
parsedPropertyPath.Elements = new List <ParsedPropertyElement>(pathElements.Length);
var currentEntityType = entityType;
ParsedPropertyElement lastElement = null;
var applyToInternalObject = false;
foreach (var pathElement in pathElements)
{
var isLastElementWasFunction = lastElement?.PropertyType == PropertyType.CollectionFunction;
if (isLastElementWasFunction)
{
throw new DynamicQueryException($"Function '{lastElement.PropertyName}' should be last element in the property path");
}
var propertyName = pathElement;
var propertyType = PropertyType.Complex;
var functionType = KnownFunctions.None;
PropertyInfo propertyInfo = null;
if (pathElement.Contains("[]"))
{
propertyType = PropertyType.Collection;
propertyName = pathElement.Substring(0, pathElement.Length - 2);
applyToInternalObject = true;
}
var isLastElementWasCollection = lastElement?.PropertyType == PropertyType.Collection;
if (isLastElementWasCollection)
{
propertyType = applyToInternalObject ? PropertyType.Complex : PropertyType.CollectionFunction;
applyToInternalObject = false;
if (propertyType == PropertyType.CollectionFunction)
{
functionType = ParseFunction(propertyName);
}
}
if (isLastElementWasCollection && propertyType != PropertyType.CollectionFunction)
{
currentEntityType = lastElement.PropertyInfo.PropertyType.GetGenericArguments().FirstOrDefault();
if (currentEntityType == null)
{
throw new DynamicQueryException($"Cannot get type of objects in collection '{lastElement.PropertyName}'");
}
}
if (propertyType != PropertyType.CollectionFunction)
{
propertyInfo = GetPropertyInfo(propertyName, currentEntityType);
if (ReflectionHelper.IsCollection(propertyInfo.PropertyType))
{
propertyType = PropertyType.Collection;
}
currentEntityType = propertyInfo.PropertyType;
}
lastElement = new ParsedPropertyElement
{
PropertyName = propertyName,
PropertyType = propertyType,
PropertyInfo = propertyInfo,
RawElementName = pathElement,
Function = functionType
};
parsedPropertyPath.Elements.Add(lastElement);
}
if (lastElement?.PropertyType == PropertyType.Collection)
{
throw new DynamicQueryException("Array or Collection cannot be the last element in ");
}
if (lastElement?.PropertyType == PropertyType.Complex)
{
lastElement.PropertyType = PropertyType.Simple;
}
return(parsedPropertyPath);
}
protected MethodInfo GetMethodInfo(ParsedPropertyElement collectionElement, KnownFunctions function)
{
var method = collectionElement.PropertyInfo.PropertyType.GetMethod(function.ToString());
return(method);
}