Get difference between two shapefile

[ValeriaAndronaco]

Hi forum,

I use ArcMap 9.3 and I would like to create a toolbar that query two shapefiles and get the difference between them.
I think that I need to perform a SelectByLocation but how do this whith c# or vb.net language?
Can you help me please?

Thanks a lot in advance!

[DubravkoAntonic]

This is huge code part to answer at once.
Enclose OnClick implementation in try catch.
But there are some lines you should comment or change.

public override void OnClick()
        {
            // i will reuse cursor false-> true
            IFeatureCursor feature1Cursor = pflayer1.FeatureClass.GetFeatures(idList, true);
                      
            while (featureA != null)
            {
                // queryin again with same params makes forever loop
                 // using only first feature from an array
                feature1Cursor = pflayer1.FeatureClass.GetFeatures(idList, true);
                featureA = feature1Cursor.NextFeature();
            }
//At this point it stops and leaves
// because your code is not in try catch block and exception occured
            string elenco = String.Empty;

public string FeaturesEqual(IFeature pFeatureA, IFeature pFeatureB)
        {
            // if value is null you have exception use Convert.ToSring(pFeatureA.get_Value(i));
                string valore1 = pFeatureA.get_Value(i).ToString();
            // I intend to use System.Object.Equals didn't use ESRI's object before
                bool equal = ESRI.ArcGIS.Geodatabase.Object.Equals(pFeatureA.get_Value(i), pFeatureB.get_Value(i));
                
            
            
        }

For now I don't have idea what else is wrong

[ValeriaAndronaco]

Ok.
I may have the wrong solution. So do not get the result I need.
I would try to change the method.

How can I do in c #, a "Select by location" between two shapefiles with the condition "are identical to"?

[DubravkoAntonic]

Hope this will help

Copy paste functions into your Tool and on MouseDown get some Features and pass them as starting point for comparing.

// searches for intersection in target layer with geometry
public static IFeatureCursor SpatialQuery(IFeatureLayer pTargetFeatureLayer, IGeometry pSearchGeometry, esriSpatialRelEnum spatialRelation)

// Check if features geometry intersects with other features in other target layer
// commentate and do compare by length or area
private static void SelectByShapeAndCheckIfEqual(IFeature searchFeature)

// test if fields have equal value
private static void SelectByShapeAndCheckIfEqual(IFeature searchFeature)

Use debugger and SDK to understand what is going on. I hope you will use it and reuse it.

[ValeriaAndronaco]

Thnks!
Your code is perfect, This is exactly the solution I was looking for!
You have been very kind.
However ... I could ask another thing?
How can I use the same code without loading the layers in the toc?

Good evening!!!

[DubravkoAntonic]

Please post in another thread maybe someone will answer your question, I'm currently sort of without the time to write complete solutions. 

Wish you luck.
Regards