I'm trying to build a simple custom SSIS component which looks at a single input column and validates it, creating an output column of type bool depending on the value of each row.
I've successfully built an even simpler component that takes a value and transforms it: that doesn't require fiddling with the output columns. In this instance I need to take in a string and output a boolean and the component needs to know that it outputs a boolean so I can feed the value into a conditional split.
I'm struggling to add the output columns. Based on code samples from Microsoft, I have done this:
public override DTSValidationStatus Validate()
{
IDTSOutput100 output = ComponentMetaData.OutputCollection[0];
IDTSOutputColumn100 outputcol = output.OutputColumnCollection.New();
outputcol.Name = "IsValid";
outputcol.SetDataTypeProperties(DataType.DT_BOOL, 0, 0, 0, 0);
return DTSValidationStatus.VS_ISVALID;
}
And then I attempt to populate it during the ProcessInput step:
public override void ProcessInput(int inputID, PipelineBuffer buffer)
{
while (buffer.NextRow())
{
string str = buffer.GetString(0);
buffer.SetBoolean(0, IsValid(str)); // validation code not relevant
}
}
When I try to use this component in the package, I get this error:
The component has detected potential metadata corruption during validation.
Error at Data Flow Task [Uppercase [24]]: System.MissingMethodException: Method not found: 'Void Microsoft.SqlServer.Dts.Pipeline.Wrapper.IDTSOutputColumn100.SetDataTypeProperties(Microsoft.SqlServer.Dts.Runtime.Wrapper.DataType, Int32, Int32, Int32, Int32)'.
at EmailValidation.Uppercase.Validate()
at Microsoft.SqlServer.Dts.Pipeline.ManagedComponentHost.HostValidate(IDTSManagedComponentWrapper100 wrapper)
Searching on this error message has yielded nothing of value.
In the original sample - and some other tutorials online - adding output columns is done by looping through the input column and adding an additional output for each. I have tried this and get the same error.
I have also tried moving the output column code from Validate
to OnInputPathAttached
which still yields the same error.
What am I doing wrong?
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