/// <summary>
/// create in expression ( operator "=in=" )
/// </summary>
/// <returns></returns>
public static Expression <Func <T, bool> > GetInExpression <T>(ParameterExpression parameter,
QueryParser.ComparisonContext context,
NamingStrategy namingStrategy = null)
{
if (parameter == null)
{
throw new ArgumentException(nameof(parameter));
}
if (context == null)
{
throw new ArgumentException(nameof(context));
}
var expressionValue = ExpressionValue.Parse <T>(parameter, context.selector().GetText(), namingStrategy);
if (!EqOrNeqOrInOrOutAutorizedType.Contains(expressionValue.Property.PropertyType))
{
throw new QueryComparisonInvalidComparatorSelectionException(context);
}
var values = QueryGetValueHelper.GetValues(expressionValue.Property.PropertyType, context.arguments());
if (values == null || values.Count == 0)
{
throw new QueryComparisonNotEnoughtArgumentException(context);
}
var methodContainsInfo =
QueryReflectionHelper.GetOrRegistryContainsMethodInfo(expressionValue.Property.PropertyType);
return(Expression.Lambda <Func <T, bool> >(
Expression.Call(Expression.Constant(methodContainsInfo.Convert(values)),
methodContainsInfo.ContainsMethod,
expressionValue.Expression), parameter));
}
public static ExpressionValue Parse <T>(ParameterExpression parameter,
string selector,
NamingStrategy namingStrategy)
{
if (parameter == null)
{
throw new ArgumentException(nameof(parameter));
}
if (selector == null)
{
throw new ArgumentException(nameof(selector));
}
Expression lastMember = parameter;
PropertyInfo property = null;
var type = typeof(T);
if (selector.IndexOf(".", StringComparison.InvariantCulture) != -1)
{
foreach (var item in selector.Split('.'))
{
property = QueryReflectionHelper.GetOrRegistryProperty(type, item, namingStrategy);
if (property == null)
{
throw new Exception($"Invalid property {selector}");
}
type = property.PropertyType;
lastMember = Expression.Property(lastMember, property);
}
}
else
{
property = QueryReflectionHelper.GetOrRegistryProperty(type, selector, namingStrategy);
if (property == null)
{
throw new Exception($"Invalid property {selector}");
}
lastMember = Expression.Property(lastMember, property);
}
return(new ExpressionValue()
{
Property = property,
Expression = lastMember
});
}
