Реализован сервис настроек приложения.

src/Intersvyaz.Core/Intersvyaz.Core.csproj

@@ -123,7 +123,9 @@
     <Compile Include="Models\SessionData.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Services\ISessionService.cs" />
+    <Compile Include="Services\ISettingsService.cs" />
     <Compile Include="Services\SessionService.cs" />
+    <Compile Include="Services\SettingsService.cs" />
     <EmbeddedResource Include="Properties\Intersvyaz.Core.rd.xml" />
   </ItemGroup>
   <ItemGroup>

src/Intersvyaz.Core/Services/ISettingsService.cs

@@ -0,0 +1,24 @@
+using System;
+
+namespace Intersvyaz.Core.Services
+{
+    public interface ISettingsService
+    {
+        /// <summary>
+        /// Событие об изменении текущего пользователя.
+        /// </summary>
+        event EventHandler<string> CurrentUserChanged;
+
+        /// <summary>
+        /// Получить текущего пользователя.
+        /// </summary>
+        /// <returns>Имя пользователя.</returns>
+        string GetCurrentUser();
+
+        /// <summary>
+        /// Установить нового текущего пользователя.
+        /// </summary>
+        /// <param name="value">Имя нового пользователя.</param>
+        void SetCurrentUser(string value);
+    }
+}

src/Intersvyaz.Core/Services/SettingsService.cs

@@ -0,0 +1,24 @@
+using System;
+using Windows.Storage;
+
+namespace Intersvyaz.Core.Services
+{
+    public class SettingsService : ISettingsService
+    {
+        /// <inheritdoc />
+        public event EventHandler<string> CurrentUserChanged;
+
+        /// <inheritdoc />
+        public string GetCurrentUser()
+        {
+            return (string)ApplicationData.Current.LocalSettings.Values["CurrentUser"] ?? null;
+        }
+
+        /// <inheritdoc />
+        public void SetCurrentUser(string value)
+        {
+            ApplicationData.Current.LocalSettings.Values["CurrentUser"] = value;
+            CurrentUserChanged?.Invoke(this, value);
+        }
+    }
+}