ETLBox
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ColumnTransformation<TInput>
Class ColumnTransformation<TInput>
ColumnRename allows you to rename the column or properties names of your ingoing data.
This transformation works with objects, ExpandoObjects and arrays as input data type.
ColumnRename will always convert the input type into a (dynamic) ExpandoObject.
Provide a column mapping with the old and the new name. The mapping can also be automatically retrieved from
existing ColumnMap attributes.
Inherited Members
Namespace: ETLBox.DataFlow
Assembly: ETLBox.dll
Syntax
public class ColumnTransformation<TInput> : DataFlowTransformation<TInput, ExpandoObject>, IDataFlowTransformation<TInput, ExpandoObject>, IDataFlowSource<ExpandoObject>, IDataFlowSource, IDataFlowDestination<TInput>, IDataFlowDestination, IDataFlowComponent, ILoggableTaskType Parameters
| Name | Description |
|---|---|
| TInput | Type of ingoing data |
Constructors
ColumnTransformation()
Declaration
public ColumnTransformation()Properties
ProgressCount
Declaration
public int ProgressCount { get; }Property Value
| Type | Description |
|---|---|
| int |
RemoveColumns
The remove columns defines if an existing property/column should be removed from the output object.
Declaration
public ICollection<RemoveColumn> RemoveColumns { get; set; }Property Value
| Type | Description |
|---|---|
| ICollection<RemoveColumn> |
RemoveFunc
Instead (or additional) to existing column removing provided via the RemoveColumns property or the RemoveColumn attribute, you can define your own function to decide if a property should be removed.
Declaration
public Func<string, bool> RemoveFunc { get; set; }Property Value
| Type | Description |
|---|---|
| Func<string, bool> |
RenameColumns
The rename columns defines how existing properties/columns are renamed. For objects and dynamic object provide a mapping with the old and the new name. The mapping can also be automatically retrieved from RenameColumn attributes on the properties in strongly typed objects.
Declaration
public ICollection<RenameColumn> RenameColumns { get; set; }Property Value
| Type | Description |
|---|---|
| ICollection<RenameColumn> |
RenameFunc
Instead (or additional) to existing column renaming provided via the RenameColumns property or the RenameColumn attribute, you can define your own renaming function. It is called for each column in each row from the input, and allows you to transform the column/property name into a different property name.
Declaration
public Func<string, string> RenameFunc { get; set; }Property Value
| Type | Description |
|---|---|
| Func<string, string> |
ReorderColumns
The reorder columns defines how existing properties/columns are ordered when creating the output object.
Declaration
public ICollection<ReorderColumn> ReorderColumns { get; set; }Property Value
| Type | Description |
|---|---|
| ICollection<ReorderColumn> |
ReorderFunc
Instead (or additional) to existing column reordering provided via the ReorderColumns property or the ReorderColumn attribute, you can define your own function to set the new index of a property.
Declaration
public Func<string, int> ReorderFunc { get; set; }Property Value
| Type | Description |
|---|---|
| Func<string, int> |
SourceBlock
SourceBlock from the underlying TPL.Dataflow which is used as output buffer for the component.
Declaration
public override ISourceBlock<ExpandoObject> SourceBlock { get; }Property Value
| Type | Description |
|---|---|
| ISourceBlock<ExpandoObject> |
Overrides
TargetBlock
TargetBlock from the underlying TPL.Dataflow which is used as input buffer for the component.
Declaration
public override ITargetBlock<TInput> TargetBlock { get; }Property Value
| Type | Description |
|---|---|
| ITargetBlock<TInput> |
Overrides
Methods
CheckParameter()
Declaration
protected override void CheckParameter()Overrides
CleanUpOnFaulted(Exception)
Declaration
protected override void CleanUpOnFaulted(Exception e)Parameters
| Type | Name | Description |
|---|---|---|
| Exception | e |
Overrides
CleanUpOnSuccess()
Declaration
protected override void CleanUpOnSuccess()Overrides
InitComponent()
Declaration
protected override void InitComponent()Overrides
LinkErrorTo(IDataFlowDestination<ETLBoxError>)
If an error occurs in the component, by default the component will throw an exception and stop execution. If you use the error linking, any erroneous records will be caught and redirected.
Declaration
public override IDataFlowSource<ETLBoxError> LinkErrorTo(IDataFlowDestination<ETLBoxError> target)Parameters
| Type | Name | Description |
|---|---|---|
| IDataFlowDestination<ETLBoxError> | target | The target for erroneous rows. |
Returns
| Type | Description |
|---|---|
| IDataFlowSource<ETLBoxError> | The linked component. |
Overrides
PrepareParameterForCheck()
Declaration
protected override void PrepareParameterForCheck()Overrides
Reset()
Declaration
protected override void Reset()Overrides
Implements
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ColumnRename