AssemblyInstanceCompareAssemblyInstances Method

Compares two assembly instances and returns a result with details about the differences

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 27.0.4.0 (27.0.4.0)
Syntax
Copy
public static AssemblyDifference CompareAssemblyInstances(
	AssemblyInstance instance1,
	AssemblyInstance instance2
)

Parameters

instance1  AssemblyInstance
The first assembly instance to compare
instance2  AssemblyInstance
the second assembly instance to compare

Return Value

AssemblyDifference
An object describing the difference between the two instances
Exceptions
ExceptionCondition
ArgumentNullException A non-optional argument was null
Remarks
Only the first found difference is returned. If the instances are identical, AssemblyDifferenceNone will be returned.
Example
C#
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// Identify the difference, if any, between two assembly instances
void FindAssemblyDifferences(AssemblyInstance instance1, AssemblyInstance instance2)
{
    Autodesk.Revit.DB.Document doc = instance1.Document;
    AssemblyDifference difference = AssemblyInstance.CompareAssemblyInstances(instance1, instance2);

    AssemblyDifferenceNone diffNone = difference as AssemblyDifferenceNone;
    if (diffNone != null)
    {
        TaskDialog.Show("Revit", "Assemblies are identical");
        return;
    }

    AssemblyDifferenceConfiguration diffConfig = difference as AssemblyDifferenceConfiguration;
    if (diffConfig != null)
    {
        TaskDialog.Show("Revit", "Elements are not arranged in space relative to each other in the same way");
        return;
    }

    AssemblyDifferenceMemberCount diffMemberCount = difference as AssemblyDifferenceMemberCount;
    if (diffMemberCount != null)
    {
        TaskDialog.Show("Revit", "Elements counts differ: " + diffMemberCount.Count1 + " & " + diffMemberCount.Count2);
        return;
    }

    AssemblyDifferenceNamingCategory diffNameCat = difference as AssemblyDifferenceNamingCategory;
    if (diffNameCat != null)
    {
        TaskDialog.Show("Revit", "Naming categories differ: " +
            Category.GetCategory(doc, diffNameCat.NamingCategoryId1).Name + " & " +
            Category.GetCategory(doc, diffNameCat.NamingCategoryId2).Name);                   
        return;
    }

    AssemblyDifferenceMemberDifference memberDifference = difference as AssemblyDifferenceMemberDifference;
    if (memberDifference != null)
    {
        AssemblyMemberDifference assemblyMemberDifference = memberDifference.MemberDifference as AssemblyMemberDifference;

        AssemblyMemberDifferentCategory differentCategory = assemblyMemberDifference as AssemblyMemberDifferentCategory;
        if (differentCategory != null)
        {
            TaskDialog.Show("Revit", "Element categories differ: " +
                Category.GetCategory(doc, diffNameCat.NamingCategoryId1).Name + " & " +
                Category.GetCategory(doc, diffNameCat.NamingCategoryId2).Name);
            return;
        }
        AssemblyMemberDifferentGeometry differentGeometry = assemblyMemberDifference as AssemblyMemberDifferentGeometry;
        if (differentGeometry != null)
        {
            TaskDialog.Show("Revit", "Member geometry differs");
            return;
        }
        AssemblyMemberDifferentParameters differentParameters = assemblyMemberDifference as AssemblyMemberDifferentParameters;
        if (differentParameters != null)
        {
            TaskDialog.Show("Revit", "Member parameters differs");
            return;
        }
        AssemblyMemberDifferentType differentType = assemblyMemberDifference as AssemblyMemberDifferentType;
        if (differentType != null)
        {
            TaskDialog.Show("Revit", "Element types differ: " + doc.GetElement(differentType.TypeId1).Name + " & " + doc.GetElement(differentType.TypeId2).Name);
            return;
        }
    }
    return;
}
See Also