An abp module that provides standard tree structure entity implement.

1. Install the following NuGet packages. (see how)

   • EasyAbp.Abp.Trees.Domain
   • EasyAbp.Abp.Trees.Domain.Shared
   • EasyAbp.Abp.Trees.EntityFrameworkCore

1. Create a entity and implement ITree<TEntity>.

2. Create a Repository for the entity. EfCoreTreeRepository<TDbContext, TEntity> override some function of EfCoreRepository<TDbContext, TEntity, TKey> to match tree structure:

   • InsertAsync :Auto Append node Code and Calc Level property when insert

   • UpdateAsync :Auto Move node when update a Entity that parentId is modified

   • DeleteAsync :Also delete Children nodes

3. You have two ways to use this Repository

   • Way 1 : Default Repository(ITreeRepository<>),
     Add context.Services.AddTreeRepository<MyProjectNameDbContext>(); to ConfigureServices method in MyProjectNameEntityFrameworkCoreModule.cs.

   • Way 2 : Create a CustomRepository that base on EfCoreTreeRepository<TDbContext, TEntity>

   • Example:

   context.Services.AddAbpDbContext<TestDbContext>(options =>
   {
   	options.AddDefaultRepositories(includeAllEntities: true);//add Abp's `IRepository<TEntity>`
   	options.AddDefaultTreeRepositories();//add `ITreeRepository<TEntity>` for all Entity with implement `ITree<TEntity>`
   	options.TreeEntity<Resource>(x => x.CodeLength = 10);//set CodeLength for each Entity(Default:5)
   });

It works fine with Volo.Abp.Application.Services.CrudAppService.

After replacing IRepository<> with ITreeRepository<Domain.OrganizationUnit>, the repository will handle the tree structure of the entity during creating, updating, and deleting.

    public class OrganizationUnitAppService:
        Volo.Abp.Application.Services.CrudAppService<
            Domain.OrganizationUnit, Application.OrganizationUnitDto,
            Application.OrganizationUnitDto,Guid, Volo.Abp.Application.Dtos.IPagedAndSortedResultRequest,
            Application.CreateOrganizationUnitDto,Application.UpdateOrganizationUnitDto>,
        IOrganizationUnitAppService
        
    {
        public OrganizationUnitAppService(
            EasyAbp.Abp.Trees.ITreeRepository<Domain.OrganizationUnit> organizationUnitRepository
            ):base(organizationUnitRepository)
        {
            
        }

    }

• Widget of tree operation for MVC UI.
• Create a TreeManager to provides more function,example: Sort(reassigned code), Ui Pagination...
• More Unit tests.