DBNull |
AltaxoDBNullColumn serves as a placeholder in case the column
type is not yet known, but some attibutes of the column must
already been set
Inheritance HierarchySystemObject
Altaxo.MainSuspendableDocumentNodeBase
Altaxo.MainSuspendableDocumentLeafNode
Altaxo.MainSuspendableDocumentLeafNodeWithSingleAccumulatedDataEventArgs
Altaxo.MainSuspendableDocumentLeafNodeWithEventArgs
Altaxo.DataDataColumn
Altaxo.DataDBNullColumn
Altaxo.MainSuspendableDocumentNodeBase
Altaxo.MainSuspendableDocumentLeafNode
Altaxo.MainSuspendableDocumentLeafNodeWithSingleAccumulatedDataEventArgs
Altaxo.MainSuspendableDocumentLeafNodeWithEventArgs
Altaxo.DataDataColumn
Altaxo.DataDBNullColumn
Namespace: Altaxo.Data
Assembly: AltaxoBase (in AltaxoBase.dll) Version: 4.8.3179.0 (4.8.3179.0)
SyntaxC#
public class DBNullColumn : DataColumn
The DBNullColumn type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | DBNullColumn | Initializes a new instance of the DBNullColumn class |
Properties| Name | Description | |
|---|---|---|
 | AccumulatedEventData |
Gets the accumulated event data.
(Inherited from SuspendableDocumentLeafNodeWithSingleAccumulatedDataT) |
 | AssignVector |
Provides a setter property to which a vector can be assigned to. Copies all elements of the vector to this column.
(Inherited from DataColumn) |
| Count | (Overrides DataColumnCount) |
| Data |
Provides a setter property to which another data column can be assigned to. Copies all elements of the other DataColumn to this column. An exception is thrown if the data types of both columns are incompatible.
See also CopyDataFrom(Object). (Inherited from DataColumn) |
| Debug_AbsolutePath |
Gets the absolute path of the node for debugging purposes.
(Inherited from SuspendableDocumentNodeBase) |
| FullName |
Returns either the column name if the column has no parent table, or the parent table name, followed by
a backslash and the column name if the column has a table.
(Inherited from DataColumn) |
| IsDirty |
Column is dirty if either there are new changed or deleted rows, and no data changed event was fired for notification.
This value is reseted after the data changed event has notified the change.
(Inherited from DataColumn) |
| IsDisposed |
Gets a value indicating whether this instance is disposed.
(Inherited from SuspendableDocumentNodeBase) |
| IsDisposeInProgress |
Gets a value indicating whether for this instance dispose is in progress, or the instance is already disposed.
(Inherited from SuspendableDocumentNodeBase) |
| IsReadOnly | (Inherited from DataColumn) |
| IsSomeoneListeningToChanges |
Gets a value indicating whether someone is listening to changes. For this, either the ParentObject or the Changed event must be set.
(Inherited from SuspendableDocumentNodeBase) |
| IsSuspended |
Gets a value indicating whether this instance is suspended.
(Inherited from SuspendableDocumentLeafNode) |
| Item |
Gets/sets the element at the index i by a value of type AltaxoVariant.
(Inherited from DataColumn) |
| ItemType |
Gets the type of the colum's items.
(Overrides DataColumnItemType) |
| Name |
Gets the name of this document node. Null is returned if the name is not set or unknown.
The set accessor will for most nodes throw a InvalidOperationException, since the name can only be set on IProjectItems.
(Inherited from SuspendableDocumentNodeBase) |
| ParentObject |
Get / sets the parent object of this data column.
(Inherited from DataColumn) |
| TypeAndName |
Returns the column type followed by a backslash and the column name.
(Inherited from DataColumn) |
Methods| Name | Description | |
|---|---|---|
 | AccumulateChangeData(Object, EventArgs) |
Accumulates the change data of the child. Currently only a flag is set to signal that the table has changed.
(Inherited from DataColumn) |
| AccumulateChangeData(Int32, Int32, Boolean) |
Accumulates the change data provided in the arguments into the m_ChangeData member.
(Inherited from DataColumn) |
| AccumulatedChangeData_SetBackAfterResumeAndSuspend |
Sets the change data without further processing. This function is infrastructure and intended to use only in OnResume after the parent has suspended this node again.
(Inherited from SuspendableDocumentLeafNodeWithSingleAccumulatedDataT) |
| AccumulatedEventData_Clear |
Clears the accumulated event data.
(Inherited from SuspendableDocumentLeafNodeWithSingleAccumulatedDataT) |
| AccumulatedEventData_HasZeroOrOneEventArg |
Determines whether there is no or only one single event arg accumulated. If this is the case, the return value is true. If there is one event arg accumulated, it is returned in the argument singleEventArg.
The return value is false if there is more than one event arg accumulated. In this case the singleEventArg is null on return, and the calling function should use AccumulatedEventData to
enumerate all accumulated event args.
(Inherited from SuspendableDocumentLeafNodeWithSingleAccumulatedDataT) |
| Add | (Inherited from DataColumn) |
| Append |
Appends data from another column to this column
(Inherited from DataColumn) |
| AppendToPosition |
Appends data from another column to this column
(Inherited from DataColumn) |
| ChildDisposeMemberT |
Helper function to dispose a child node of this instance. It helps to ensure the correct order: first, the child node is set to null and only then the child node is disposed.
(Inherited from SuspendableDocumentNodeBase) |
| Clear |
Clears all rows.
(Inherited from DataColumn) |
| Clone | (Overrides DataColumnClone) |
| Contains | (Inherited from DataColumn) |
| CopyDataFrom | (Overrides DataColumnCopyDataFrom(Object)) |
| CopyHeaderInformationFrom |
copies the header information, like label and so on
from another column to this column
ColumnName and ColumnNumber is not copied!
(Inherited from DataColumn) |
| CopyTo | (Inherited from DataColumn) |
| CreateColumnOfSelectedRows(IAscendingIntegerCollection) |
Creates a new column, consisting only of the selected rows of the original column.
(Inherited from DataColumn) |
| CutToMaximumLength |
Cuts the column to the provided length. The actual length of the column may be less than the provided parameter if the column contains empty elements.
(Inherited from DataColumn) |
| Dispose |
Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
(Inherited from SuspendableDocumentNodeBase) |
| Dispose(Boolean) |
Releases unmanaged and - optionally - managed resources.
(Inherited from SuspendableDocumentNodeBase) |
| EhParentTunnelingEventHappened |
Is called by the parent when a tunneling event happened into the parent.
(Inherited from SuspendableDocumentNodeBase) |
| EhSelfChanged |
Calls EhSelfChanged with EventArgs.Empty
(Inherited from SuspendableDocumentLeafNodeWithEventArgs) |
| EhSelfChanged(EventArgs) |
Called if some member of this instance itself has changed.
(Inherited from SuspendableDocumentLeafNode) |
| EhSelfChanged(Int32, Int32, Boolean) |
This function has to be called by derived classes if any changes in their data occur.
(Inherited from DataColumn) |
| EhSelfTunnelingEventHappened(TunnelingEventArgs) |
Is called by this instance if a tunneling event happened into this instance. The tunneling event triggers the TunneledEvent and is additionally distributed to all childs of this instance.
(Inherited from SuspendableDocumentNodeBase) |
| EhSelfTunnelingEventHappened(TunnelingEventArgs, Boolean) |
Is called by this instance if a tunneling event happened into this instance.
The tunneling event triggers the TunneledEvent and is - depending on the provided parameter - also distributed to all childs of this instance.
(Inherited from SuspendableDocumentNodeBase) |
| Equals | Determines whether the specified object is equal to the current object. (Inherited from Object) |
| Finalize |
Finalizes an instance of the SuspendableDocumentNodeBase class.
(Inherited from SuspendableDocumentNodeBase) |
| GetColumnStyleType | (Overrides DataColumnGetColumnStyleType) |
| GetEnumerator | (Inherited from DataColumn) |
| GetHashCode | Serves as the default hash function. (Inherited from Object) |
| GetType | Gets the Type of the current instance. (Inherited from Object) |
| GetVariantAt | (Overrides DataColumnGetVariantAt(Int32)) |
| HandleLowPriorityChildChangeCases |
Handles the cases when a child changes, but a reaction is neccessary only if the table is not suspended currently.
(Inherited from SuspendableDocumentLeafNode) |
| IndexOf | (Inherited from DataColumn) |
| IndicesOf |
Gets all indices where the element is equal to the value given in item.
(Inherited from DataColumn) |
| Insert | (Inherited from DataColumn) |
| InsertRows | (Overrides DataColumnInsertRows(Int32, Int32)) |
| IsElementEmpty | (Overrides DataColumnIsElementEmpty(Int32)) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object) |
| OnAboutToBeResumed |
Is called when the suspend level is still 1 (one), but is about to fall to zero, i.e. shortly before the call to OnResume. This function is not called before OnResumeSilently!
(Inherited from SuspendableDocumentLeafNode) |
| OnChanged |
Fires the change event with the EventArgs provided in the argument.
(Inherited from SuspendableDocumentNodeBase) |
| OnResume |
Is called when the suspend level falls down from 1 to zero by a call to Resume or a call to [M:Altaxo.Main.ISuspendToken.Dispose()].
(Inherited from SuspendableDocumentLeafNode) |
| OnResumeSilently |
Is called when the suspend level falls down from 1 to zero by a call to ResumeSilently.
The implementation should delete any accumulated events, should also disarm the suspendTokens of the childs of this object, and should not fire any Changed events nor set the change state of the object to dirty.
(Inherited from SuspendableDocumentLeafNode) |
| OnSuspended |
Called when the suspend level has just gone from 0 to 1, i.e. the object was suspended.
(Inherited from SuspendableDocumentLeafNode) |
| OnTunnelingEvent |
Fires the TunneledEvent event.
(Inherited from SuspendableDocumentNodeBase) |
| Remove | (Inherited from DataColumn) |
| RemoveAt | (Inherited from DataColumn) |
| RemoveRows | (Overrides DataColumnRemoveRows(Int32, Int32)) |
| Resume(ISuspendToken) |
Resumes changed events by calling Resume for the provided suspend token, and setting the reference to the suspend token to null.
If Event data were accumulated during the suspended state, a changed event is triggered for each event data.
(Inherited from SuspendableDocumentNodeBase) |
| Resume(ISuspendToken, EventFiring) |
Resumes changed events, either with taking the accumulated event data into account (see Resume(ISuspendToken)) or discarding the accumulated event data (see ResumeSilently(ISuspendToken),
depending on the provided argument eventFiring.
(Inherited from SuspendableDocumentNodeBase) |
| ResumeCompleteTemporarily |
Resumes the object completely for only a short time. Thus, if object was suspended before, it will be suspended again when the function returns.
(Inherited from SuspendableDocumentLeafNode) |
| ResumeCompleteTemporarilyGetToken |
Resumes the object completely for the time the returned token is referenced and not disposed.
The return value is a token that had 'absorbed' the suspend count of the object, resulting in the suspend count
of the object dropped to 0 (zero). When the returned token is finally disposed, the suspend count of the object is increased again by the 'absorbed' suspend count.
(Inherited from SuspendableDocumentLeafNode) |
| ResumeSilently |
Resumes changed events by calling Resume for the provided suspend token, and setting the reference to the suspend token to null.
All event data accumulated during the suspended state are discarded, and thus no change event is triggered even if the instance has changed during the suspended state.
(Inherited from SuspendableDocumentNodeBase) |
| SetDisposeInProgress |
Sets the flag that dispose is in progress for this node and all child nodes recursively.
(Inherited from SuspendableDocumentNodeBase) |
| SetElementEmpty | (Overrides DataColumnSetElementEmpty(Int32)) |
| SetMemberAndRaiseSelfChangedT(NullableT, NullableT) |
Sets a member variable of this instance and raise a change event with Empty if the new value is different from the old value.
The comparison is done using the IEquatableT interface of the member variable.
Note: to set members that implement IDocumentNode please use the Child... functions.
(Inherited from SuspendableDocumentNodeBase) |
| SetMemberAndRaiseSelfChangedT(T, T) |
Sets a member variable of this instance and raise a change event with Empty if the new value is different from the old value.
The comparison is done using the IEquatableT interface of the member variable.
Note: to set members that implement IDocumentNode please use the Child... functions.
(Inherited from SuspendableDocumentNodeBase) |
| SetMemberEnumAndRaiseSelfChangedT |
Sets a member variable (which is an Enum) of this instance and raise a change event with Empty if the new value is different from the old value.
The comparison is done using the IEquatableT interface of the member variable.
Note: to set members that implement IDocumentNode please use the Child... functions.
(Inherited from SuspendableDocumentNodeBase) |
| SetValueAt | (Overrides DataColumnSetValueAt(Int32, AltaxoVariant)) |
| SuspendGetToken |
Suspend will increase the SuspendLevel.
(Inherited from SuspendableDocumentLeafNode) |
| ToROVector |
Creates a wrapper that implements IROVector with starting index = 0 and number of elements = Count.
(Inherited from DataColumn) |
| ToROVector(Int32, Int32) |
Creates a wrapper that implements IROVector.
(Inherited from DataColumn) |
| ToString | Returns a string that represents the current object. (Inherited from Object) |
| ToVector |
Creates a wrapper that implements IVector with starting index = 0 and number of elements = Count.
(Inherited from DataColumn) |
| ToVector(Int32, Int32) |
Creates a wrapper that implements IVector.
(Inherited from DataColumn) |
| TryGetName |
Test if this item already has a name.
(Inherited from SuspendableDocumentNodeBase) |
| vop_Addition(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Addition(DataColumn, DataColumn) |
Adds another data column to this data column (item by item).
(Inherited from DataColumn) |
| vop_Addition_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Addition_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_And(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_And(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_And_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_And_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Complement | (Inherited from DataColumn) |
| vop_Decrement | (Inherited from DataColumn) |
| vop_Division(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Division(DataColumn, DataColumn) |
Divides this data column by another data column(item by item).
(Inherited from DataColumn) |
| vop_Division_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Division_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_False | (Inherited from DataColumn) |
| vop_Greater(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Greater(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Greater_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Greater_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_GreaterOrEqual(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_GreaterOrEqual(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_GreaterOrEqual_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_GreaterOrEqual_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Increment | (Inherited from DataColumn) |
| vop_Lesser(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Lesser(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Lesser_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Lesser_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_LesserOrEqual(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_LesserOrEqual(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_LesserOrEqual_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_LesserOrEqual_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Minus | (Inherited from DataColumn) |
| vop_Modulo(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Modulo(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Modulo_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Modulo_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Multiplication(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Multiplication(DataColumn, DataColumn) |
Multiplies another data column to this data column (item by item).
(Inherited from DataColumn) |
| vop_Multiplication_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Multiplication_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Not | (Inherited from DataColumn) |
| vop_Or(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Or(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Or_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Or_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Plus | (Inherited from DataColumn) |
| vop_ShiftLeft(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_ShiftLeft(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_ShiftLeft_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_ShiftLeft_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_ShiftRight(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_ShiftRight(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_ShiftRight_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_ShiftRight_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Subtraction(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Subtraction(DataColumn, DataColumn) |
Subtracts another data column from this data column (item by item).
(Inherited from DataColumn) |
| vop_Subtraction_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Subtraction_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_True | (Inherited from DataColumn) |
| vop_Xor(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Xor(DataColumn, DataColumn) | (Inherited from DataColumn) |
| vop_Xor_Rev(AltaxoVariant, DataColumn) | (Inherited from DataColumn) |
| vop_Xor_Rev(DataColumn, DataColumn) | (Inherited from DataColumn) |
Events| Name | Description | |
|---|---|---|
 | Changed | Fired when something in the object has changed, and the object is not suspended. (Inherited from SuspendableDocumentNodeBase) |
| TunneledEvent |
The event that is fired when the object is disposed. First argument is the sender, second argument is the original source, and third argument is the event arg.
(Inherited from SuspendableDocumentNodeBase) |
Fields| Name | Description | |
|---|---|---|
 | _accumulatedEventData |
Holds the accumulated change data.
(Inherited from SuspendableDocumentLeafNodeWithSingleAccumulatedDataT) |
| _parent |
The parent object this instance belongs to.
(Inherited from SuspendableDocumentNodeBase) |
Extension Methods| Name | Description | |
|---|---|---|
 | SetColumnFromFractionalIndex |
Fills destination column with values from an original column by help of a fractional index.
(Defined by MergeTables) |
| ShowRenameColumnDialog |
Asks for a new name and then renames the selected data column or property column.
(Defined by ColumnCommands) |
| ToHorzMatrix |
This returns a read and writeable, horizontal oriented matrix of a DoubleColumn (Defined by DataColumnWrapper) |
| ToROVector |
This returns a read-only vector of a INumericColumn (Defined by DataColumnWrapper) |
| ToROVector |
This returns a read-only vector of a INumericColumn (Defined by DataColumnWrapper) |
| ToROVector |
This returns a read-only vector of a INumericColumn (Defined by DataColumnWrapper) |
| ToROVectorCopy |
This returns a read-only vector of a INumericColumn, but the data are copyied before. Thus, if you change the data
into the numeric column, the data of the returned vector is not influenced.
(Defined by DataColumnWrapper) |
| ToVector |
This returns a read and writeable vector of a DoubleColumn (Defined by DataColumnWrapper) |
| ToVector |
This returns a read and writeable vector of a DoubleColumn (Defined by DataColumnWrapper) |
| ToVector |
This returns a read and writeable vector of a DoubleColumn (Defined by DataColumnWrapper) |
| ToVertMatrix |
This returns a read and writeable, vertical oriented matrix of a DoubleColumn (Defined by DataColumnWrapper) |
See Also