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I am trying to send multiples input features to the Geoprocessing.IGeoProcessor (to do an Intersect). I am doing this because I can't add the layer path since one of them is from ArcSDE. The example on the ESRI website is incomplete:

Building a custom geoprocessing function tool

[VB.NET] ' Multivalue parameter of Feature Layers/Feature Classes.' Dim inputParameter As IGPParameterEdit3 = New GPParameterClass() Dim inputType As IGPDataType = New GPFeatureLayerTypeClass() Dim mvType As IGPMultiValue = New GPMultiValueClass() mvType.MemberDataType = inputType Dim mvValue As IGPMultiValue = New GPMultiValueClass() mvValue.MemberDataType = inputType inputFeatures.Name = "input_features" inputFeatures.DisplayName = "Input Features" inputFeatures.ParameterType = esriGPParameterType.esriGPParameterTypeRequired inputFeatures.Direction = esriGPParameterDirection.esriGPParameterDirectionInput inputFeatures.DataType = CType(mvType, IGPDataType) inputFeatures.Value = CType(mvValue, IGPValue) parameters.Add(inputFeatures)

There is no code to actually add the feature layer to the input features list. I tried to add my feature layer with :

mvValue.AddValue(lFeatureLayer)

and I got a invalid COM interface cast exception. What is the real way to do this?

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If you want to create a new geoprocessing tool like in your example, then you do not add the layer yourself. This is doing the tool for you during running it.

But I think you want to consume an already existing tool (like intersect). This is explained in How to run a geoprocessing tool

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  • I ended up doing something else because it doesn't work. Like I said, I must use the IfeatureLayer object because I can't use a path for ArcSDE. Anyway, I don't need an answer anymore. Thanks! Commented Oct 20, 2016 at 15:31

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