DefinitionGetDataType Method

Return Value

ForgeTypeId
A ForgeTypeId identifying the data type of the parameter or an empty ForgeTypeId.

The returned ForgeTypeId may be empty or may identify either a spec or a category. When it is a category, it indicates a Family Type parameter of that category. See Parameter.IsSpec(ForgeTypeId), UnitUtils.IsMeasurableSpec(ForgeTypeId), Category.IsBuiltInCategory(ForgeTypeId), and Parameter.IsValidDataType(ForgeTypeId). Some built-in parameters, such as those for color or level, have special data types which are not available for use with user-defined parameters and which have no representation in the Revit user interface or API. For these built-in parameters, this method returns an empty ForgeTypeId instance.

//Find parameter using the Parameter's definition data type.
public Parameter FindParameter(Element element)
{
    Parameter foundParameter = null;
    // This will find the first parameter that measures length
    foreach (Parameter parameter in element.Parameters)
    {
        if (parameter.Definition.GetDataType() == SpecTypeId.Length)
        {
            foundParameter = parameter;
            break;
        }
    }
    return foundParameter;
}