Derived column was not map to output column? How can i do? - c#-4.0

Question

Package is successfully generated. but derived column showing the error bellow-
Validation error. This is a programmed DataFlowTask Derived Column [2]: Attempt to parse the expression "Empid" failed and returned error code 0xC00470A2. The expression cannot be parsed. It might contain invalid elements or it might not be well-formed. There may also be an out-of-memory error. MyProgrammedDataflowTaskWithDerivedColumn.dtsx
bellow is my code-
// Create an application
Application app = new Application();
// Create a package
Package pkg = new Package();
//Setting some properties
pkg.Name = #"MyProgrammedDataflowTaskWithDerivedColumn";
//Adding a connection to the database AdventureWorksLT2008R2
ConnectionManager ConnMgrAdvent = pkg.Connections.Add("OLEDB");
ConnMgrAdvent.ConnectionString = "Data Source=412-1682;Initial Catalog=Empdb;Provider=SQLNCLI11.1;Integrated Security=SSPI;Auto Translate=False;";
ConnMgrAdvent.Name = #"AdventureWorks2008R2";
ConnMgrAdvent.Description = #"SSIS Connection Manager for OLEDB Source";
//Adding a connection to the database Import_DB
ConnectionManager ConnMgrImport_DB = pkg.Connections.Add("OLEDB");
ConnMgrImport_DB.ConnectionString = "Data Source=412-1682;Initial Catalog=stgEmpdb;Provider=SQLNCLI11.1;Integrated Security=SSPI;Auto Translate=False;";
ConnMgrImport_DB.Name = #"Import_DB";
ConnMgrImport_DB.Description = #"SSIS Connection Manager for OLEDB Source";
//Adding the dataflow task to the package
Executable exe = pkg.Executables.Add("STOCK:PipelineTask");
TaskHost TKHSQLHost = (TaskHost)exe;
TKHSQLHost.Name = "This is a programmed DataFlowTask";
MainPipe dataFlowTask = (MainPipe)TKHSQLHost.InnerObject;
// Create the source component.
IDTSComponentMetaData100 source =
dataFlowTask.ComponentMetaDataCollection.New();
source.ComponentClassID = "DTSAdapter.OleDbSource.3";
CManagedComponentWrapper srcDesignTime = source.Instantiate();
srcDesignTime.ProvideComponentProperties();
// Assign the connection manager.
if (source.RuntimeConnectionCollection.Count > 0)
{
source.RuntimeConnectionCollection[0].ConnectionManager =DtsConvert.GetExtendedInterface(ConnMgrAdvent);
source.RuntimeConnectionCollection[0].ConnectionManagerID =
pkg.Connections["AdventureWorks2008R2"].ID;
}
// Set the custom properties of the source.
srcDesignTime.SetComponentProperty("AccessMode", 0);
srcDesignTime.SetComponentProperty("OpenRowset", "[dbo].[emp1]");
// Connect to the data source, and then update the metadata for the source.
srcDesignTime.AcquireConnections(null);
srcDesignTime.ReinitializeMetaData();
srcDesignTime.ReleaseConnections();
// Create the destination component.
IDTSComponentMetaData100 destination =
dataFlowTask.ComponentMetaDataCollection.New();
destination.ComponentClassID = "DTSAdapter.OleDbDestination.3";
CManagedComponentWrapper destDesignTime = destination.Instantiate();
destDesignTime.ProvideComponentProperties();
// Assign the connection manager.
destination.RuntimeConnectionCollection[0].ConnectionManager =
DtsConvert.GetExtendedInterface(ConnMgrImport_DB);
if (destination.RuntimeConnectionCollection.Count > 0)
{
destination.RuntimeConnectionCollection[0].ConnectionManager =
DtsConvert.GetExtendedInterface(ConnMgrImport_DB);
destination.RuntimeConnectionCollection[0].ConnectionManagerID =
pkg.Connections["Import_DB"].ID;
}
// Set the custom properties of the destination
destDesignTime.SetComponentProperty("AccessMode", 0);
destDesignTime.SetComponentProperty("OpenRowset", "[dbo].[emp1]");
// Connect to the data source, and then update the metadata for the source.
destDesignTime.AcquireConnections(null);
destDesignTime.ReinitializeMetaData();
destDesignTime.ReleaseConnections();
//Derived Column
IDTSComponentMetaData100 derived =
dataFlowTask.ComponentMetaDataCollection.New();
derived.Name = "Derived Column Component";
derived.ComponentClassID = "DTSTransform.DerivedColumn.3";
CManagedComponentWrapper DesignDerivedColumns = derived.Instantiate();
DesignDerivedColumns.ProvideComponentProperties(); //design time
derived.InputCollection[0].ExternalMetadataColumnCollection.IsUsed = false;
derived.InputCollection[0].HasSideEffects = false;
//update the metadata for the derived columns
DesignDerivedColumns.AcquireConnections(null);
DesignDerivedColumns.ReinitializeMetaData();
DesignDerivedColumns.ReleaseConnections();
//Create the path from source to derived columns
IDTSPath100 SourceToDerivedPath = dataFlowTask.PathCollection.New();
SourceToDerivedPath.AttachPathAndPropagateNotifications(source.OutputCollection[0],derived.InputCollection[0]);
//Create the path from derived to desitination
IDTSPath100 DerivedToDestinationPath = dataFlowTask.PathCollection.New();
DerivedToDestinationPath.AttachPathAndPropagateNotifications(derived.OutputCollection[0], destination.InputCollection[0]);
// derivedColumns.SetUsageType(dInput.ID, vdInput, vColumn.LineageID, DTSUsageType.UT_READONLY);
//Give me an output column
IDTSInput100 dInput;
IDTSVirtualInput100 vdInput;
//Get this components default input and virtual input
dInput = derived.InputCollection[0];
vdInput = dInput.GetVirtualInput();
IDTSOutputColumn100 myCol = derived.OutputCollection[0].OutputColumnCollection.New();
myCol.Name = "RowKey";
myCol.SetDataTypeProperties(Microsoft.SqlServer.Dts.Runtime.Wrapper.DataType.DT_I4, 0, 0, 0, 0);
myCol.ExternalMetadataColumnID = 0;
myCol.ErrorRowDisposition = DTSRowDisposition.RD_FailComponent;
myCol.TruncationRowDisposition = DTSRowDisposition.RD_FailComponent;
IDTSCustomProperty100 myProp = myCol.CustomPropertyCollection.New();
myProp.Name = "Expression";
myProp.Value = "Empid";// + vColumn.LineageID;
myProp = myCol.CustomPropertyCollection.New();
myProp.Name = "FriendlyExpression";
myProp.Value = "Empid";
//Create the input columns for the transformation component
IDTSInput100 input = derived.InputCollection[0];
IDTSVirtualInput100 derivedInputVirtual = input.GetVirtualInput();
input.ErrorRowDisposition = DTSRowDisposition.RD_NotUsed;
input.ErrorOrTruncationOperation = "";
DesignDerivedColumns.ReleaseConnections();
// Get the destination's default input and virtual input.
IDTSInput100 destinationinput = destination.InputCollection[0];
int destinationInputID = input.ID;
IDTSVirtualInput100 vdestinationinput = destinationinput.GetVirtualInput();
//Iterate through the virtual input column collection.
foreach (IDTSVirtualInputColumn100 vColumn in vdestinationinput.VirtualInputColumnCollection)
{
IDTSInputColumn100 vCol = destDesignTime.SetUsageType(destinationinput.ID, vdestinationinput, vColumn.LineageID, DTSUsageType.UT_READWRITE);
destDesignTime.MapInputColumn(destinationinput.ID, vCol.ID, destinationinput.ExternalMetadataColumnCollection[vColumn.Name].ID);
}
app.SaveToXml(String.Format(#"D:\{0}.dtsx", pkg.Name), pkg, null);

Answer 1

solved this by adding bellow code to validate derived column component :-
IDTSInput100 DerivedColumnInput = derived.InputCollection[0];
IDTSVirtualInput100 DerivedColumnVirtualInput = DerivedColumnInput.GetVirtualInput();
IDTSVirtualInputColumnCollection100 DerivedColumnVirtualInputColumns = DerivedColumnVirtualInput.VirtualInputColumnCollection;
foreach (IDTSVirtualInputColumn100 virtualInputColumnDT in DerivedColumnVirtualInputColumns)
{
// Select column, and retain new input column
if (virtualInputColumnDT.Name=="Empid")
{
designDerivedColumns.SetUsageType(DerivedColumnInput.ID, DerivedColumnVirtualInput, virtualInputColumnDT.LineageID, DTSUsageType.UT_READONLY);
}
}