Issues/440 (#445)

* (#440) Added GetTablesAsync() to list from IOfflineStore.

* (#440) Fix for ConcreteOfflineStore impl. in tests.

sdk/dotnet/src/Microsoft.Datasync.Client.SQLiteStore/OfflineSQLiteStore.cs

@@ -185,6 +185,17 @@ public override async Task<Page<JObject>> GetPageAsync(QueryDescription query, C
             }
         }
 
+        /// <summary>
+        /// Gets the list of offline tables that have been defined.
+        /// </summary>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> to observe.</param>
+        /// <returns>A task that returns the list of tables that have been defined.</returns>
+        public override async Task<IList<string>> GetTablesAsync(CancellationToken cancellationToken = default)
+        {
+            await EnsureInitializedAsync(cancellationToken).ConfigureAwait(false);
+            return tableMap.Keys.Where(t => !t.StartsWith("__")).ToList();
+        }
+
         /// <summary>
         /// Initialize the store.  This is over-ridden by the store implementation to provide a point
         /// where the tables can be created or updated.

sdk/dotnet/src/Microsoft.Datasync.Client/Offline/AbstractOfflineStore.cs

@@ -63,6 +63,13 @@ public abstract class AbstractOfflineStore : IOfflineStore
         /// <returns>A task that returns a page of items when complete.</returns>
         public abstract Task<Page<JObject>> GetPageAsync(QueryDescription query, CancellationToken cancellationToken = default);
 
+        /// <summary>
+        /// Gets the list of offline tables that have been defined.
+        /// </summary>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> to observe.</param>
+        /// <returns>A task that returns the list of tables that have been defined.</returns>
+        public abstract Task<IList<string>> GetTablesAsync(CancellationToken cancellationToken = default);
+
         /// <summary>
         /// Initializes the store for use.
         /// </summary>

sdk/dotnet/src/Microsoft.Datasync.Client/Offline/IOfflineStore.cs

@@ -52,6 +52,13 @@ public interface IOfflineStore : IDisposable
         /// <returns>A task that returns a page of items when complete.</returns>
         Task<Page<JObject>> GetPageAsync(QueryDescription query, CancellationToken cancellationToken = default);
 
+        /// <summary>
+        /// Gets the list of offline tables that have been defined.
+        /// </summary>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> to observe.</param>
+        /// <returns>A task that returns the list of tables that have been defined.</returns>
+        Task<IList<string>> GetTablesAsync(CancellationToken cancellationToken = default);
+
         /// <summary>
         /// Initializes the store for use.
         /// </summary>

sdk/dotnet/test/Datasync.Common.Test/Mocks/MockOfflineStore.cs

@@ -188,6 +188,17 @@ public Task<Page<JObject>> GetPageAsync(QueryDescription query, CancellationToke
             }
         }
 
+        /// <summary>
+        /// Gets the list of offline tables that have been defined.
+        /// </summary>
+        /// <param name="cancellationToken">A <see cref="CancellationToken"/> to observe.</param>
+        /// <returns>A task that returns the list of tables that have been defined.</returns>
+        public Task<IList<string>> GetTablesAsync(CancellationToken cancellationToken = default)
+        {
+            var list = TableMap.Keys.Where(t => !t.StartsWith("__")).ToList();
+            return Task.FromResult((IList<string>)list);
+        }
+
         /// <summary>
         /// Initializes the store for use.
         /// </summary>

sdk/dotnet/test/Microsoft.Datasync.Client.SQLiteStore.Test/OfflineSQLiteStore.Test.cs

@@ -396,5 +396,20 @@ public async Task DeltaTokenStore_StoresWithMSAccuracy()
             var storedToken = await deltaTokenStore.GetDeltaTokenAsync("testtable", "testquery");
             Assert.Equal(storedToken.Millisecond, deltaToken.Millisecond);
         }
+
+        [Fact]
+        public async Task GetTablesAsync_ReturnsListOfTables()
+        {
+            // Set up the default store and client.
+            var store = new OfflineSQLiteStore(ConnectionString);
+            store.DefineTable(TestTable, IdEntityDefinition);
+            var client = new DatasyncClient("https://localhost/", new DatasyncClientOptions { OfflineStore = store });
+            var context = new SyncContext(client, store);
+            await context.InitializeAsync();
+
+            var tables = await context.OfflineStore.GetTablesAsync();
+            Assert.Equal(1, tables.Count);  // If it's 4, then the system tables are being returned as well.
+            Assert.Equal(TestTable, tables[0]);
+        }
     }
 }

sdk/dotnet/test/Microsoft.Datasync.Client.Test/Offline/AbstractOfflineStore.Test.cs

@@ -87,6 +87,11 @@ public override Task<Page<JObject>> GetPageAsync(QueryDescription query, Cancell
             throw new NotImplementedException();
         }
 
+        public override Task<IList<string>> GetTablesAsync(CancellationToken cancellationToken = default)
+        {
+            throw new NotImplementedException();
+        }
+
         public override Task UpsertAsync(string tableName, IEnumerable<JObject> items, bool ignoreMissingColumns, CancellationToken cancellationToken = default)
         {
             throw new NotImplementedException();