DBTableMultiColumnGadget.Columns Field

Specifies a collection of strings that are the names of the columns comprising the DBTableMultiColumnGadget object. In the DBPrimaryKey descendant class, these columns are primary keys. In DBForeignKey, these are foreign keys. In DBIndex, these are columns comprising the index.

Namespace: DevExpress.Xpo.DB

Assembly: DevExpress.Data.v24.1.dll

NuGet Package: DevExpress.Data

Declaration

C#

public StringCollection Columns

VB.NET

Public Columns As StringCollection

Field Value

Type
StringCollection

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the Columns field.

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-generate-persistent-classes-at-runtime-based-on-a-dataset-e1198/CS/WindowsApplication4/Form1.cs#L26

XPClassInfo info = XpoDefault.Dictionary.CreateClass(XpoDefault.Dictionary.QueryClassInfo(baseType), table.Name);
string key = table.PrimaryKey.Columns[0];
foreach (DBColumn c in table.Columns)

XPO_how-to-generate-persistent-metadata-for-an-arbitrary-data-table-e2922/CS/MapArbitraryDatabaseExample/Program.cs#L40

DBColumnType primaryColumnType = table.GetColumn(table.PrimaryKey.Columns[0]).ColumnType;
classInfo.CreateMember(table.PrimaryKey.Columns[0], DBColumn.GetType(primaryColumnType),
    new KeyAttribute(IsAutoGenerationSupported(primaryColumnType)));

XAF-How-to-Implement-CRUD-Operations-for-Non-Persistent-Objects-Stored-Remotely/CS/NonPersistentObjectsDemo.Module/DataStoreMapper.cs#L179

if(mapping.Table.PrimaryKey != null) {
    foreach(var columnName in mapping.Table.PrimaryKey.Columns) {
        var column = mapping.Table.GetColumn(columnName);

VB.NET

XPO_how-to-generate-persistent-classes-at-runtime-based-on-a-dataset-e1198/VB/WindowsApplication4/Form1.vb#L25

Dim info As XPClassInfo = XpoDefault.Dictionary.CreateClass(XpoDefault.Dictionary.QueryClassInfo(baseType), table.Name)
Dim key As String = table.PrimaryKey.Columns(0)
For Each c As DBColumn In table.Columns

XAF-How-to-Implement-CRUD-Operations-for-Non-Persistent-Objects-Stored-Remotely/VB/NonPersistentObjectsDemo.Module/DataStoreMapper.vb#L187

If mapping.Table.PrimaryKey IsNot Nothing Then
    For Each columnName In mapping.Table.PrimaryKey.Columns
        Dim column = mapping.Table.GetColumn(columnName)