Altaxo user manual and class reference
Altaxo class reference
Altaxo Namespaces
Altaxo.Data Namespaces
Altaxo.Data
DataColumnCollection Class
DataColumnCollection Methods
AccumulateChangeData Method
Add Method
AppendAllColumns Method
AppendAllColumnsToPosition Method
AppendAllColumnsWithSpace Method
AppendCopiedColumnFrom Method
AppendRowFrom Method
AreAllColumnsOfTheSameType Method
ChangeColumnPosition Method
ChangeRowPosition Method
ClearData Method
Clone Method
Contains Method
ContainsColumn Method
CopyAllColumnsFrom Method
CopyAllColumnsWithoutDataFrom Method
CopyOrReplaceOrAdd Method
DeleteXProperty Method
Dispose Method
EnsureDeferredDataAreLoaded Method
EnsureExistence Method
EnsureExistenceAtPositionStrictly Method
EnsureUniqueColumnKindsForIndependentVariables Method
FindNewColumnName Method
FindUniqueColumnName Method
FindUniqueColumnNameWithBase Method
FindUniqueColumnNameWithoutBase Method
FindXColumnOf Method
FindXColumnOfGroup Method
FindYColumnOf Method
FindYColumnOfGroup Method
GetChildObjectNamed Method
GetColumnGroup Method
GetColumnKind Method
GetColumnName Method
GetColumnNames Method
GetColumnNumber Method
GetDocumentNodeChildrenWithName Method
GetEnumerator Method
GetGroupNumbersAll Method
GetListOfColumnsWithGroupNumber Method
GetNameDictionaryOfColumnsWithGroupNumber Method
GetNameOfChildObject Method
GetNamesOfColumnsWithGroupNumber Method
GetNextColumnName Method
GetParentDataColumnCollectionOf Method
GetUnusedColumnGroupNumber Method
HandleHighPriorityChildChangeCases Method
HandleLowPriorityChildChangeCases Method
HaveMultipleGroups Method
Insert Method
InsertRow Method
InsertRows Method
IsColumnOfType Method
IsColumnStructureCompatible Method
MergeColumnTypesFrom Method
MoveColumnsTo Method
OnTunnelingEvent Method
RefreshColumnIndices Method
RefreshRowCount Method
RemoveColumn Method
RemoveColumns Method
RemoveColumnsAll Method
RemoveRow Method
RemoveRowInGroup Method
RemoveRows Method
RemoveRowsAll Method
RemoveRowsInColumns Method
RemoveRowsInGroup Method
Replace Method
ReplaceOrAdd Method
SetColumnGroup Method
SetColumnKind Method
SetColumnName Method
SetDataDirty Method
SwapColumnPositions Method
TryGetColumn Method
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DataColumnCollectionEnsureExistence Method

Either returns an existing column with name columnname and type expectedtype or creates a new column of the provided type.

Namespace: Altaxo.Data
Assembly: AltaxoBase (in AltaxoBase.dll) Version: 4.8.3179.0 (4.8.3179.0)
Syntax
C#
Copy
public DataColumn EnsureExistence(
	string columnname,
	Type expectedcolumntype,
	ColumnKind kind,
	int groupNumber
)

Parameters

columnname  String
The column name.
expectedcolumntype  Type
Expected type of the column.
kind  ColumnKind
Only used when a new column is created.
groupNumber  Int32
Only used when a new column is created.

Return Value

DataColumn
Either an existing column of name columnname and type expectedtype. If this is not the case, a new column with a similar name and the expectedtype is created and added to the collection. The new column is returned then.
See Also