NullableBehavior Enum

Contains values specifying if a nullable column should be created when updating the database schema.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v21.1.dll

Declaration

C#

public enum NullableBehavior

VB.NET

Public Enum NullableBehavior

Members

Name	Description
Default	The default mode. Has the same effect as AlwaysAllowNulls.
AlwaysAllowNulls	A nullable column is always created.
ByUnderlyingType	A nullable column is created when the mapped property type is not a value type.

Related API Members

The following properties accept/return NullableBehavior values:

• NullableBehaviorAttribute.NullableBehavior
• XPClassInfo.NullableBehavior
• XPDictionary.NullableBehavior
• XpoDefault.NullableBehavior

Related API Members

The following properties accept/return NullableBehavior values:

• DataLayerOptions.NullableBehavior
• NullableBehaviorAttribute.NullableBehavior
• XPClassInfo.NullableBehavior
• XPDictionary.NullableBehavior
• XpoDefault.NullableBehavior

Remarks

These numeration values are passed to the NullableBehaviorAttribute attribute and to the following properties:

• XpoDefault.NullableBehavior
• XPDictionary.NullableBehavior
• XPClassInfo.NullableBehavior

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the NullableBehavior enum.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

XPO_how-to-implement-odata4-service-with-xpo/CS/ODataService/Helpers/ConnectionHelper.cs#L35

var dictionary = new ReflectionDictionary();
dictionary.NullableBehavior = NullableBehavior.ByUnderlyingType;
dictionary.GetDataStoreSchema(persistentTypes);