Allow transfer of ownership of DbConnection from application to DbContext

src/EFCore.Relational/Extensions/RelationalDatabaseFacadeExtensions.cs

@@ -646,16 +646,18 @@ public static DbConnection GetDbConnection(this DatabaseFacade databaseFacade)
     ///         The connection can only be set when the existing connection, if any, is not open.
     ///     </para>
     ///     <para>
-    ///         Note that the given connection must be disposed by application code since it was not created by Entity Framework.
-    ///     </para>
-    ///     <para>
     ///         See <see href="https://aka.ms/efcore-docs-connections">Connections and connection strings</see> for more information and examples.
     ///     </para>
     /// </remarks>
     /// <param name="databaseFacade">The <see cref="DatabaseFacade" /> for the context.</param>
     /// <param name="connection">The connection.</param>
-    public static void SetDbConnection(this DatabaseFacade databaseFacade, DbConnection? connection)
-        => GetFacadeDependencies(databaseFacade).RelationalConnection.DbConnection = connection;
+    /// <param name="contextOwnsConnection">
+    ///     If <see langword="true" />, then EF will take ownership of the connection and will
+    ///     dispose it in the same way it would dispose a connection created by EF. If <see langword="false" />, then the caller still
+    ///     owns the connection and is responsible for its disposal. The default value is <see langword="false"/>.
+    /// </param>
+    public static void SetDbConnection(this DatabaseFacade databaseFacade, DbConnection? connection, bool contextOwnsConnection = false)
+        => GetFacadeDependencies(databaseFacade).RelationalConnection.SetDbConnection(connection, contextOwnsConnection);
 
     /// <summary>
     ///     Gets the underlying connection string configured for this <see cref="DbContext" />.

src/EFCore.Relational/Infrastructure/RelationalOptionsExtension.cs

@@ -25,6 +25,7 @@ public abstract class RelationalOptionsExtension : IDbContextOptionsExtension
 
     private string? _connectionString;
     private DbConnection? _connection;
+    private bool _connectionOwned;
     private int? _commandTimeout;
     private int? _maxBatchSize;
     private int? _minBatchSize;
@@ -50,6 +51,7 @@ protected RelationalOptionsExtension(RelationalOptionsExtension copyFrom)
     {
         _connectionString = copyFrom._connectionString;
         _connection = copyFrom._connection;
+        _connectionOwned = copyFrom._connectionOwned;
         _commandTimeout = copyFrom._commandTimeout;
         _maxBatchSize = copyFrom._maxBatchSize;
         _minBatchSize = copyFrom._minBatchSize;
@@ -101,17 +103,34 @@ public virtual RelationalOptionsExtension WithConnectionString(string? connectio
     public virtual DbConnection? Connection
         => _connection;
 
+    /// <summary>
+    ///     <see langword="true"/> if the <see cref="Connection"/> is owned by the context and should be disposed appropriately.
+    /// </summary>
+    public virtual bool ConnectionOwned
+        => _connectionOwned;
+
     /// <summary>
     ///     Creates a new instance with all options the same as for this instance, but with the given option changed.
     ///     It is unusual to call this method directly. Instead use <see cref="DbContextOptionsBuilder" />.
     /// </summary>
     /// <param name="connection">The option to change.</param>
     /// <returns>A new instance with the option changed.</returns>
     public virtual RelationalOptionsExtension WithConnection(DbConnection? connection)
+        => WithConnection(connection, owned: false);
+
+    /// <summary>
+    ///     Creates a new instance with all options the same as for this instance, but with the given option changed.
+    ///     It is unusual to call this method directly. Instead use <see cref="DbContextOptionsBuilder" />.
+    /// </summary>
+    /// <param name="connection">The option to change.</param>
+    /// <param name="owned">If <see langword="true"/>, then the connection will become owned by the context, and will be disposed in the same way that a connection created by the context is disposed.</param>
+    /// <returns>A new instance with the option changed.</returns>
+    public virtual RelationalOptionsExtension WithConnection(DbConnection? connection, bool owned)
     {
         var clone = Clone();
 
         clone._connection = connection;
+        clone._connectionOwned = owned;
 
         return clone;
     }

src/EFCore.Relational/Storage/IRelationalConnection.cs

@@ -47,6 +47,22 @@ public interface IRelationalConnection : IRelationalTransactionManager, IDisposa
     [AllowNull]
     DbConnection DbConnection { get; set; }
 
+    /// <summary>
+    ///     Sets the underlying <see cref="System.Data.Common.DbConnection" /> used to connect to the database.
+    /// </summary>
+    /// <param name="value">The connection object.</param>
+    /// <param name="contextOwnsConnection">
+    ///     If <see langword="true" />, then EF will take ownership of the connection and will
+    ///     dispose it in the same way it would dispose a connection created by EF. If <see langword="false" />, then the caller still
+    ///     owns the connection and is responsible for its disposal.
+    /// </param>
+    /// <remarks>
+    ///     <para>
+    ///         The connection can only be changed when the existing connection, if any, is not open.
+    ///     </para>
+    /// </remarks>
+    void SetDbConnection(DbConnection? value, bool contextOwnsConnection);
+
     /// <summary>
     ///     The <see cref="DbContext" /> currently in use, or <see langword="null" /> if not known.
     /// </summary>

src/EFCore.Relational/Storage/RelationalConnection.cs

@@ -67,7 +67,7 @@ protected RelationalConnection(RelationalConnectionDependencies dependencies)
         if (relationalOptions.Connection != null)
         {
             _connection = relationalOptions.Connection;
-            _connectionOwned = false;
+            _connectionOwned = relationalOptions.ConnectionOwned;
 
             if (_connectionString != null)
             {
@@ -172,19 +172,25 @@ public virtual DbConnection DbConnection
         }
         set
         {
-            if (!ReferenceEquals(_connection, value))
+            SetDbConnection(value, contextOwnsConnection: false);
+        }
+    }
+
+    /// <inheritdoc />
+    public virtual void SetDbConnection(DbConnection? value, bool contextOwnsConnection)
+    {
+        if (!ReferenceEquals(_connection, value))
+        {
+            if (_openedCount > 0)
             {
-                if (_openedCount > 0)
-                {
-                    throw new InvalidOperationException(RelationalStrings.CannotChangeWhenOpen);
-                }
+                throw new InvalidOperationException(RelationalStrings.CannotChangeWhenOpen);
+            }
 
-                Dispose();
+            Dispose();
 
-                _connection = value;
-                _connectionString = null;
-                _connectionOwned = false;
-            }
+            _connection = value;
+            _connectionString = null;
+            _connectionOwned = contextOwnsConnection;
         }
     }
 

src/EFCore.SqlServer/Extensions/SqlServerDbContextOptionsBuilderExtensions.cs

@@ -75,6 +75,30 @@ public static DbContextOptionsBuilder UseSqlServer(
         return optionsBuilder;
     }
 
+    // Note: Decision made to use DbConnection not SqlConnection: Issue #772
+    /// <summary>
+    ///     Configures the context to connect to a Microsoft SQL Server database.
+    /// </summary>
+    /// <remarks>
+    ///     See <see href="https://aka.ms/efcore-docs-dbcontext-options">Using DbContextOptions</see>, and
+    ///     <see href="https://aka.ms/efcore-docs-sqlserver">Accessing SQL Server and SQL Azure databases with EF Core</see>
+    ///     for more information and examples.
+    /// </remarks>
+    /// <param name="optionsBuilder">The builder being used to configure the context.</param>
+    /// <param name="connection">
+    ///     An existing <see cref="DbConnection" /> to be used to connect to the database. If the connection is
+    ///     in the open state then EF will not open or close the connection. If the connection is in the closed
+    ///     state then EF will open and close the connection as needed. The caller owns the connection and is
+    ///     responsible for its disposal.
+    /// </param>
+    /// <param name="sqlServerOptionsAction">An optional action to allow additional SQL Server specific configuration.</param>
+    /// <returns>The options builder so that further configuration can be chained.</returns>
+    public static DbContextOptionsBuilder UseSqlServer(
+        this DbContextOptionsBuilder optionsBuilder,
+        DbConnection connection,
+        Action<SqlServerDbContextOptionsBuilder>? sqlServerOptionsAction = null)
+        => UseSqlServer(optionsBuilder, connection, false, sqlServerOptionsAction);
+
     // Note: Decision made to use DbConnection not SqlConnection: Issue #772
     /// <summary>
     ///     Configures the context to connect to a Microsoft SQL Server database.
@@ -90,16 +114,22 @@ public static DbContextOptionsBuilder UseSqlServer(
     ///     in the open state then EF will not open or close the connection. If the connection is in the closed
     ///     state then EF will open and close the connection as needed.
     /// </param>
+    /// <param name="contextOwnsConnection">
+    ///     If <see langword="true" />, then EF will take ownership of the connection and will
+    ///     dispose it in the same way it would dispose a connection created by EF. If <see langword="false" />, then the caller still
+    ///     owns the connection and is responsible for its disposal.
+    /// </param>
     /// <param name="sqlServerOptionsAction">An optional action to allow additional SQL Server specific configuration.</param>
     /// <returns>The options builder so that further configuration can be chained.</returns>
     public static DbContextOptionsBuilder UseSqlServer(
         this DbContextOptionsBuilder optionsBuilder,
         DbConnection connection,
+        bool contextOwnsConnection,
         Action<SqlServerDbContextOptionsBuilder>? sqlServerOptionsAction = null)
     {
         Check.NotNull(connection, nameof(connection));
 
-        var extension = (SqlServerOptionsExtension)GetOrCreateExtension(optionsBuilder).WithConnection(connection);
+        var extension = (SqlServerOptionsExtension)GetOrCreateExtension(optionsBuilder).WithConnection(connection, contextOwnsConnection);
         ((IDbContextOptionsBuilderInfrastructure)optionsBuilder).AddOrUpdateExtension(extension);
 
         ConfigureWarnings(optionsBuilder);
@@ -170,7 +200,8 @@ public static DbContextOptionsBuilder<TContext> UseSqlServer<TContext>(
     /// <param name="connection">
     ///     An existing <see cref="DbConnection" /> to be used to connect to the database. If the connection is
     ///     in the open state then EF will not open or close the connection. If the connection is in the closed
-    ///     state then EF will open and close the connection as needed.
+    ///     state then EF will open and close the connection as needed. The caller owns the connection and is
+    ///     responsible for its disposal.
     /// </param>
     /// <param name="sqlServerOptionsAction">An optional action to allow additional SQL Server specific configuration.</param>
     /// <returns>The options builder so that further configuration can be chained.</returns>
@@ -182,6 +213,38 @@ public static DbContextOptionsBuilder<TContext> UseSqlServer<TContext>(
         => (DbContextOptionsBuilder<TContext>)UseSqlServer(
             (DbContextOptionsBuilder)optionsBuilder, connection, sqlServerOptionsAction);
 
+    // Note: Decision made to use DbConnection not SqlConnection: Issue #772
+    /// <summary>
+    ///     Configures the context to connect to a Microsoft SQL Server database.
+    /// </summary>
+    /// <remarks>
+    ///     See <see href="https://aka.ms/efcore-docs-dbcontext-options">Using DbContextOptions</see>, and
+    ///     <see href="https://aka.ms/efcore-docs-sqlserver">Accessing SQL Server and SQL Azure databases with EF Core</see>
+    ///     for more information and examples.
+    /// </remarks>
+    /// <typeparam name="TContext">The type of context to be configured.</typeparam>
+    /// <param name="optionsBuilder">The builder being used to configure the context.</param>
+    /// <param name="connection">
+    ///     An existing <see cref="DbConnection" /> to be used to connect to the database. If the connection is
+    ///     in the open state then EF will not open or close the connection. If the connection is in the closed
+    ///     state then EF will open and close the connection as needed.
+    /// </param>
+    /// <param name="contextOwnsConnection">
+    ///     If <see langword="true" />, then EF will take ownership of the connection and will
+    ///     dispose it in the same way it would dispose a connection created by EF. If <see langword="false" />, then the caller still
+    ///     owns the connection and is responsible for its disposal.
+    /// </param>
+    /// <param name="sqlServerOptionsAction">An optional action to allow additional SQL Server specific configuration.</param>
+    /// <returns>The options builder so that further configuration can be chained.</returns>
+    public static DbContextOptionsBuilder<TContext> UseSqlServer<TContext>(
+        this DbContextOptionsBuilder<TContext> optionsBuilder,
+        DbConnection connection,
+        bool contextOwnsConnection,
+        Action<SqlServerDbContextOptionsBuilder>? sqlServerOptionsAction = null)
+        where TContext : DbContext
+        => (DbContextOptionsBuilder<TContext>)UseSqlServer(
+            (DbContextOptionsBuilder)optionsBuilder, connection, contextOwnsConnection, sqlServerOptionsAction);
+
     private static SqlServerOptionsExtension GetOrCreateExtension(DbContextOptionsBuilder optionsBuilder)
         => optionsBuilder.Options.FindExtension<SqlServerOptionsExtension>()
             ?? new SqlServerOptionsExtension();

src/EFCore.Sqlite.Core/Extensions/SqliteDbContextOptionsBuilderExtensions.cs

@@ -72,6 +72,28 @@ public static DbContextOptionsBuilder UseSqlite(
         return optionsBuilder;
     }
 
+    /// <summary>
+    ///     Configures the context to connect to a SQLite database.
+    /// </summary>
+    /// <remarks>
+    ///     See <see href="https://aka.ms/efcore-docs-dbcontext-options">Using DbContextOptions</see>, and
+    ///     <see href="https://aka.ms/efcore-docs-sqlite">Accessing SQLite databases with EF Core</see> for more information and examples.
+    /// </remarks>
+    /// <param name="optionsBuilder">The builder being used to configure the context.</param>
+    /// <param name="connection">
+    ///     An existing <see cref="DbConnection" /> to be used to connect to the database. If the connection is
+    ///     in the open state then EF will not open or close the connection. If the connection is in the closed
+    ///     state then EF will open and close the connection as needed. The caller owns the connection and is
+    ///     responsible for its disposal.
+    /// </param>
+    /// <param name="sqliteOptionsAction">An optional action to allow additional SQLite specific configuration.</param>
+    /// <returns>The options builder so that further configuration can be chained.</returns>
+    public static DbContextOptionsBuilder UseSqlite(
+        this DbContextOptionsBuilder optionsBuilder,
+        DbConnection connection,
+        Action<SqliteDbContextOptionsBuilder>? sqliteOptionsAction = null)
+        => UseSqlite(optionsBuilder, connection, false, sqliteOptionsAction);
+
     /// <summary>
     ///     Configures the context to connect to a SQLite database.
     /// </summary>
@@ -85,16 +107,22 @@ public static DbContextOptionsBuilder UseSqlite(
     ///     in the open state then EF will not open or close the connection. If the connection is in the closed
     ///     state then EF will open and close the connection as needed.
     /// </param>
+    /// <param name="contextOwnsConnection">
+    ///     If <see langword="true" />, then EF will take ownership of the connection and will
+    ///     dispose it in the same way it would dispose a connection created by EF. If <see langword="false" />, then the caller still
+    ///     owns the connection and is responsible for its disposal.
+    /// </param>
     /// <param name="sqliteOptionsAction">An optional action to allow additional SQLite specific configuration.</param>
     /// <returns>The options builder so that further configuration can be chained.</returns>
     public static DbContextOptionsBuilder UseSqlite(
         this DbContextOptionsBuilder optionsBuilder,
         DbConnection connection,
+        bool contextOwnsConnection,
         Action<SqliteDbContextOptionsBuilder>? sqliteOptionsAction = null)
     {
         Check.NotNull(connection, nameof(connection));
 
-        var extension = (SqliteOptionsExtension)GetOrCreateExtension(optionsBuilder).WithConnection(connection);
+        var extension = (SqliteOptionsExtension)GetOrCreateExtension(optionsBuilder).WithConnection(connection, contextOwnsConnection);
         ((IDbContextOptionsBuilderInfrastructure)optionsBuilder).AddOrUpdateExtension(extension);
 
         ConfigureWarnings(optionsBuilder);
@@ -161,7 +189,8 @@ public static DbContextOptionsBuilder<TContext> UseSqlite<TContext>(
     /// <param name="connection">
     ///     An existing <see cref="DbConnection" /> to be used to connect to the database. If the connection is
     ///     in the open state then EF will not open or close the connection. If the connection is in the closed
-    ///     state then EF will open and close the connection as needed.
+    ///     state then EF will open and close the connection as needed. The caller owns the connection and is
+    ///     responsible for its disposal.
     /// </param>
     /// <param name="sqliteOptionsAction">An optional action to allow additional SQLite specific configuration.</param>
     /// <returns>The options builder so that further configuration can be chained.</returns>
@@ -173,6 +202,36 @@ public static DbContextOptionsBuilder<TContext> UseSqlite<TContext>(
         => (DbContextOptionsBuilder<TContext>)UseSqlite(
             (DbContextOptionsBuilder)optionsBuilder, connection, sqliteOptionsAction);
 
+    /// <summary>
+    ///     Configures the context to connect to a SQLite database.
+    /// </summary>
+    /// <remarks>
+    ///     See <see href="https://aka.ms/efcore-docs-dbcontext-options">Using DbContextOptions</see>, and
+    ///     <see href="https://aka.ms/efcore-docs-sqlite">Accessing SQLite databases with EF Core</see> for more information and examples.
+    /// </remarks>
+    /// <typeparam name="TContext">The type of context to be configured.</typeparam>
+    /// <param name="optionsBuilder">The builder being used to configure the context.</param>
+    /// <param name="connection">
+    ///     An existing <see cref="DbConnection" /> to be used to connect to the database. If the connection is
+    ///     in the open state then EF will not open or close the connection. If the connection is in the closed
+    ///     state then EF will open and close the connection as needed.
+    /// </param>
+    /// <param name="contextOwnsConnection">
+    ///     If <see langword="true" />, then EF will take ownership of the connection and will
+    ///     dispose it in the same way it would dispose a connection created by EF. If <see langword="false" />, then the caller still
+    ///     owns the connection and is responsible for its disposal.
+    /// </param>
+    /// <param name="sqliteOptionsAction">An optional action to allow additional SQLite specific configuration.</param>
+    /// <returns>The options builder so that further configuration can be chained.</returns>
+    public static DbContextOptionsBuilder<TContext> UseSqlite<TContext>(
+        this DbContextOptionsBuilder<TContext> optionsBuilder,
+        DbConnection connection,
+        bool contextOwnsConnection,
+        Action<SqliteDbContextOptionsBuilder>? sqliteOptionsAction = null)
+        where TContext : DbContext
+        => (DbContextOptionsBuilder<TContext>)UseSqlite(
+            (DbContextOptionsBuilder)optionsBuilder, connection, contextOwnsConnection, sqliteOptionsAction);
+
     private static SqliteOptionsExtension GetOrCreateExtension(DbContextOptionsBuilder options)
         => options.Options.FindExtension<SqliteOptionsExtension>()
             ?? new SqliteOptionsExtension();