Projektstruktur optimiert und Benutzer- & Gruppenverzeichnisdienste abgeschlossen.

DigitalData.Core.Contracts/Infrastructure/IADDataAccessor.cs

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+using System.DirectoryServices;
+
+namespace DigitalData.Core.Contracts.Infrastructure
+{
+    public interface IADDataAccessor
+    {
+        SearchResultCollection ReadAll();
+
+        SearchResult? ReadOne();
+    }
+}

DigitalData.Core.Contracts/Infrastructure/ICRUDRepository.cs

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+namespace DigitalData.Core.Contracts.Infrastructure
+{
+    /// <summary>
+    /// Defines the contract for CRUD operations on a repository for entities of type TEntity.
+    /// </summary>
+    /// <typeparam name="TEntity">The type of the entity this repository works with.</typeparam>
+    /// <typeparam name="TId">The type of the identifier for the entity.</typeparam>
+    public interface ICRUDRepository<TEntity, TId> where TEntity : class
+    {
+        /// <summary>
+        /// Adds a new entity to the repository.
+        /// </summary>
+        /// <param name="entity">The entity to add.</param>
+        /// <returns>The added entity, or null if the entity cannot be added.</returns>
+        Task<TEntity?> CreateAsync(TEntity entity);
+
+        /// <summary>
+        /// Retrieves an entity by its identifier from the repository.
+        /// </summary>
+        /// <param name="id">The identifier of the entity to retrieve.</param>
+        /// <returns>The entity found, or null if no entity is found.</returns>
+        Task<TEntity?> ReadByIdAsync(TId id);
+
+        /// <summary>
+        /// Retrieves all entities from the repository.
+        /// </summary>
+        /// <returns>A collection of all entities.</returns>
+        Task<IEnumerable<TEntity>> ReadAllAsync();
+
+        /// <summary>
+        /// Updates an existing entity in the repository.
+        /// </summary>
+        /// <param name="entity">The entity to update.</param>
+        /// <returns>The updated entity.</returns>
+        Task<bool> UpdateAsync(TEntity entity);
+
+        /// <summary>
+        /// Deletes an entity from the repository.
+        /// </summary>
+        /// <param name="entity">The entity to delete.</param>
+        /// <returns>If entity is deleted, return true othwerwise return false.</returns>
+        Task<bool> DeleteAsync(TEntity entity);
+    }
+}

DigitalData.Core.Contracts/Infrastructure/ISearcherProvider.cs

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+using System.DirectoryServices;
+
+namespace DigitalData.Core.Contracts.Infrastructure
+{
+    public interface ISearcherProvider<ADDataAccessor>
+    {
+        public Func<DirectorySearcher> Provide { get; }
+    }
+}