Interktion im WPF erweitert

DaSaSo.Domain/Services/ProjectServices/IProjectService.cs

@@ -0,0 +1,14 @@
+using DaSaSo.Domain.Model;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Domain.Services.ProjectServices
+{
+    public interface IProjectService
+    {
+        Task<Project> CreateProject(Client Auftraggeber);
+    }
+}

DaSaSo.Domain/Services/ProjectServices/ProjectService.cs

@@ -0,0 +1,31 @@
+using DaSaSo.Domain.Model;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.Domain.Services.ProjectServices
+{
+    public class ProjectService : IProjectService
+    {
+        private readonly IDataService<Client> _clientService;
+
+        public ProjectService(IDataService<Client> clientService)
+        {
+            _clientService = clientService;
+        }
+
+        public async Task<Project> CreateProject(Client Auftraggeber)
+        {
+            Project project = new Project()
+            {
+                Client = Auftraggeber
+            };
+
+            Auftraggeber.Projects.Add(project);
+            await _clientService.Update(Auftraggeber.Id, Auftraggeber);
+            return project;
+        }
+    }
+}