sharpmap / sharpmap.businessobjects Goto Github PK

I have been trialing a BusinessObjectFilterProvider class following SharpMap FilterProvider:

namespace SharpMap.Data.Providers.Business
{
    public abstract class BusinessObjectFilterProvider
    {
        public delegate bool FilterMethod(object bo);
        public FilterMethod FilterDelegate { get; set; }
    }
}

Inherited by:
public class BusinessObjectProvider<TFeature> : BusinessObjectFilterProvider, IProvider

Requests based upon geometric selection are filtered similar to:

public Collection<IGeometry> GetGeometriesInView(Envelope bbox)
{
    var res = new Collection<IGeometry>();
    foreach (TFeature feature in _source.Select(bbox))
    {
        if (FilterDelegate == null || FilterDelegate(feature))
        {
            res.Add(_source.GetGeometry(feature));
        }
    }
    return res;
}

I have been using on InMemory objects.

Let me know if this would be useful to the project and I can issue pull request.

I'm wondering if it would be possible to use InMemoryBuisnessObjectSource as the primary collection of business objects, rather than managing a separate parallel collection as the primary source.

It would require several additional methods for efficient management of objects such as:

InsertFeature
Add a single business object to the collection, with CachedExtents expanding to include the feature

SelectFeatures
Select features based upon object attributes using lambda expression.

DeleteFeatures
Delete features based upon object attributes using lambda expression.

Would this be compatible with overall project? While I would like to contribute, I'm not sure how to achieve the last 2 in C#.

Hi and thanks for SharpMap.BusinessObjects - it's a great idea, much appreciated.

Small issue: SharpMap.BusinessObjects doesn't compile initially as SQLite.Interop.dll (x86 and x64) is not part of source code. I am currently working with InMemory so have excluded from the project in order to compile.

Working with InMemory objects, I am occasionally getting error Collection was modified; enumeration operation may not execute. I will add locking on InMemoryBusinessObjectSource and submit pull request.