/// <summary>
/// Returns the list of key properties defined on <paramref name="type"/>; null if <paramref name="type"/> is complex.
/// </summary>
/// <param name="type">Type in question.</param>
/// <param name="hasProperties">true if <paramref name="type"/> has any (declared or inherited) properties; otherwise false.</param>
/// <returns>Returns the list of key properties defined on <paramref name="type"/>; null if <paramref name="type"/> is complex.</returns>
internal static PropertyInfo[] GetKeyPropertiesOnType(Type type, out bool hasProperties)
{
if (CommonUtil.IsUnsupportedType(type))
{
throw new InvalidOperationException(c.Strings.ClientType_UnsupportedType(type));
}
string typeName = type.ToString();
IEnumerable <object> customAttributes = type.GetCustomAttributes(true);
bool isEntity = customAttributes.OfType <EntityTypeAttribute>().Any();
KeyAttribute dataServiceKeyAttribute = customAttributes.OfType <KeyAttribute>().FirstOrDefault();
List <PropertyInfo> keyProperties = new List <PropertyInfo>();
PropertyInfo[] properties = ClientTypeUtil.GetPropertiesOnType(type, false /*declaredOnly*/).ToArray();
hasProperties = properties.Length > 0;
KeyKind currentKeyKind = KeyKind.NotKey;
KeyKind newKeyKind = KeyKind.NotKey;
foreach (PropertyInfo propertyInfo in properties)
{
if ((newKeyKind = ClientTypeUtil.IsKeyProperty(propertyInfo, dataServiceKeyAttribute)) != KeyKind.NotKey)
{
if (newKeyKind > currentKeyKind)
{
keyProperties.Clear();
currentKeyKind = newKeyKind;
keyProperties.Add(propertyInfo);
}
else if (newKeyKind == currentKeyKind)
{
keyProperties.Add(propertyInfo);
}
}
}
Type keyPropertyDeclaringType = null;
foreach (PropertyInfo key in keyProperties)
{
if (keyPropertyDeclaringType == null)
{
keyPropertyDeclaringType = key.DeclaringType;
}
else if (keyPropertyDeclaringType != key.DeclaringType)
{
throw c.Error.InvalidOperation(c.Strings.ClientType_KeysOnDifferentDeclaredType(typeName));
}
if (!PrimitiveType.IsKnownType(key.PropertyType) && !(key.PropertyType.GetGenericTypeDefinition() == typeof(System.Nullable <>) && key.PropertyType.GetGenericArguments().First().IsEnum()))
{
throw c.Error.InvalidOperation(c.Strings.ClientType_KeysMustBeSimpleTypes(key.Name, typeName, key.PropertyType.FullName));
}
}
if (dataServiceKeyAttribute != null)
{
if (newKeyKind == KeyKind.AttributedKey && keyProperties.Count != dataServiceKeyAttribute?.KeyNames.Count)
{
var m = (from string a in dataServiceKeyAttribute.KeyNames
where (from b in properties
where b.Name == a
select b).FirstOrDefault() == null
select a).First <string>();
throw c.Error.InvalidOperation(c.Strings.ClientType_MissingProperty(typeName, m));
}
}
return(keyProperties.Count > 0 ? keyProperties.ToArray() : (isEntity ? ClientTypeUtil.EmptyPropertyInfoArray : null));
}