XPClassInfo.CreateMember(String, XPClassInfo, Attribute[]) Method

Creates a new member metadata which is referenced to the specified XPClassInfo object.

Namespace: DevExpress.Xpo.Metadata

Assembly: DevExpress.Xpo.v24.1.dll

NuGet Packages: DevExpress.Win.PivotGrid, DevExpress.Win.TreeMap, DevExpress.Xpo

NuGet Package: DevExpress.Xpo

Declaration

C#

public XPCustomMemberInfo CreateMember(
    string propertyName,
    XPClassInfo referenceType,
    params Attribute[] attributes
)

VB.NET

Public Function CreateMember(
    propertyName As String,
    referenceType As XPClassInfo,
    ParamArray attributes As Attribute()
) As XPCustomMemberInfo

Parameters

Name	Type	Description
propertyName	String	A String value which specifies the name of the new member.
referenceType	XPClassInfo	An XPClassInfo object which provides the metadata of the class that the new property references.
attributes	Attribute[]	An array of Attribute objects that represent the new member’s attributes.

Returns

Type	Description
XPCustomMemberInfo	An XPCustomMemberInfo descendant which provides the new member’s metadata.

Remarks

The CreateMember method allows custom members to be created dynamically.

Example

The following sample code shows how to create custom fields using the XPClassInfo.CreateMember method.

C#

using DevExpress.Xpo;
using DevExpress.Xpo.Metadata;
// ...

XPClassInfo customerClassInfo = Session.DefaultSession.GetClassInfo(typeof(Customer));
customerClassInfo.CreateMember("Name", typeof(string));
customerClassInfo.CreateMember("CompanyName", typeof(string));
// Set the nonPersistent parameter to true for collection properties
customerClassInfo.CreateMember("Orders", typeof(XPCollection), true, 
    new AssociationAttribute("CustomerOrders", typeof(Order)), new AggregatedAttribute());

VB.NET

Imports DevExpress.Xpo
Imports DevExpress.Xpo.Metadata
' ...

Dim customerClassInfo As XPClassInfo = Session.DefaultSession.GetClassInfo(GetType(Customer))
customerClassInfo.CreateMember("Name", GetType(String))
customerClassInfo.CreateMember("CompanyName", GetType(String))
' Set the nonPersistent parameter to True for collection properties
customerClassInfo.CreateMember("Orders", GetType(XPCollection), True, _
    New AssociationAttribute("CustomerOrders", GetType(Order)), New AggregatedAttribute())

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the CreateMember(String, XPClassInfo, Attribute[]) method.

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-persist-metadata-e269/CS/MetadataObjects.cs#L111

protected override XPMemberInfo CreateMemberCore(XPClassInfo owner) {
    XPMemberInfo member = owner.CreateMember(Name, ReferenceType.CreateClass(owner.Dictionary));
    return member;

XPO_how-to-generate-persistent-classes-at-runtime-based-on-a-dataset-e1198/CS/WindowsApplication4/Form1.cs#L53

order.CreateMember("CustomerId", customer, new Attribute[] { a1 });
customer.CreateMember("Orders", typeof(XPCollection), true, new Attribute[] { a });

VB.NET

XPO_how-to-persist-metadata-e269/VB/MetadataObjects.vb#L157

Protected Overrides Function CreateMemberCore(ByVal owner As XPClassInfo) As XPMemberInfo
    Dim member As XPMemberInfo = owner.CreateMember(Name, ReferenceType.CreateClass(owner.Dictionary))
    Return member

XPO_how-to-generate-persistent-classes-at-runtime-based-on-a-dataset-e1198/VB/WindowsApplication4/Form1.vb#L51

order.CreateMember("CustomerId", customer, New Attribute() {a1})
customer.CreateMember("Orders", GetType(XPCollection), True, New Attribute() { a })