List of All GeoProcessing Data Types

From the resource center of ESRI, comes a pdf that contains all the different type of GeoProcessing data types with correlating ArcObjects in it. This is very helpful, and any .NET GP developer should have it printed out and right next to them.

Enjoy

2 GP Functions That Make Life Easier

Here are two functions that make life easier for custom GP development. The find parameter value by the parameter name, return parameter type IGPValue. The second method is get parameter by name, which returns IGPParameter3. Parameter value by name allows you to retrieve

Get Parameter By Name

public IGPParameter3 GetParameterByName( IArray paramvalues, string name )
{
IGPParameter3 gpParameter;
for (int i = 0; i < paramvalues.Count; i++)
{
gpParameter = (IGPParameter3)paramvalues.get_Element( i );
if (gpParameter.Name.Equals( name, StringComparison.OrdinalIgnoreCase ))
return gpParameter;
}
return null;
}


Get Parameter Value By Name

public IGPValue GetParameterValueByName( IArray paramvalues, string name )
{
IGPUtilities2 gpUtils = new GPUtilitiesClass();
IGPParameter3 gpParameter;

for (int i = 0; i < paramvalues.Count; i++)
{
gpParameter = (IGPParameter3)paramvalues.get_Element( i );
if (gpParameter.Name.ToUpper() == name.ToUpper())
return gpUtils.UnpackGPValue( gpParameter );
}
return null;
}


Creating a Feature Set via C#

A very powerful model builder feature is the create variable option. This will allow users to create almost any type of user input desire. The feature set variable is a very helpful variable when a user needs to interact with the map or recordset. The feature set allows users to draw points, polylines, or polygons on the fly. To do this in C#, you need to use the IGPRecordSetLayerClass(), but the process of making the interactive part work isn't that straight forward.

To get the interactive part of the Feature set to work, you must define the Schema with either a layer file or feature class in model builder. When you take a look at the ArcObject description of a parameter, you notice a pointer called Schema, but this isn't where you define the template data for a GPFeatureRecordSet, you define it in Value().


inputParameter.DataType = new GPFeatureRecordSetLayerTypeClass();
//
// create the GP Feature Recordset Layer Object
// from template data
//
IFeatureClass FC = (IFeatureClass)m_GPUtilities.OpenDatasetFromLocation( @"