Harden disposal paths and test project metadata

DynamORM.Tests/DynamORM.Tests.csproj

@@ -13,6 +13,7 @@
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <OutputType>Library</OutputType>
     <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 

DynamORM/Builders/Implementation/DynamicQueryBuilder.cs

@@ -964,6 +964,9 @@ namespace DynamORM.Builders.Implementation
         /// freeing, releasing, or resetting unmanaged resources.</summary>
         public virtual void Dispose()
         {
+            if (IsDisposed)
+                return;
+
             IsDisposed = true;
 
             if (Database != null)

DynamORM/DynamicCachedReader.cs

@@ -32,6 +32,7 @@ namespace DynamORM
 
         private List<Data> _data = new List<Data>();
         private int _currentDataPosition = 0;
+        private bool _isDisposed;
 
         private DynamicCachedReader()
         {
@@ -445,11 +446,27 @@ namespace DynamORM
         /// freeing, releasing, or resetting unmanaged resources.</summary>
         public void Dispose()
         {
+            if (_isDisposed)
+                return;
+
+            _isDisposed = true;
+            IsClosed = true;
+
+            if (_data == null)
+                return;
+
             foreach (var data in _data)
             {
+                if (data == null)
+                    continue;
+
+                if (data._names != null)
                     data._names.Clear();
+                if (data._types != null)
                     data._types.Clear();
+                if (data._cache != null)
                     data._cache.Clear();
+                if (data._schema != null)
                     data._schema.Dispose();
             }
 

DynamORM/DynamicCommand.cs

@@ -264,18 +264,31 @@ namespace DynamORM
         /// freeing, releasing, or resetting unmanaged resources.</summary>
         public void Dispose()
         {
-            lock (_db.SyncLock)
+            if (IsDisposed)
+                return;
+
+            var db = _db;
+            if (db == null)
             {
+                IsDisposed = true;
+                return;
+            }
+
+            lock (db.SyncLock)
+            {
+                if (IsDisposed)
+                    return;
+
+                IsDisposed = true;
+
                 if (_con != null)
                 {
-                    List<IDbCommand> pool = _db.CommandsPool.TryGetValue(_con.Connection);
+                    List<IDbCommand> pool = db.CommandsPool.TryGetValue(_con.Connection);
 
                     if (pool != null && pool.Contains(this))
                         pool.Remove(this);
                 }
 
-                IsDisposed = true;
-
                 if (_command != null)
                 {
                     _command.Parameters.Clear();
@@ -283,6 +296,9 @@ namespace DynamORM
                     _command.Dispose();
                     _command = null;
                 }
+
+                _con = null;
+                _db = null;
             }
         }
 

DynamORM/DynamicConnection.cs

@@ -165,7 +165,15 @@ namespace DynamORM
         /// releasing, or resetting unmanaged resources.</summary>
         public void Dispose()
         {
-            _db.Close(Connection);
+            if (IsDisposed)
+                return;
+
+            var db = _db;
+            if (db != null && Connection != null)
+                db.Close(Connection);
+
+            Connection = null;
+            _db = null;
             IsDisposed = true;
         }
 

DynamORM/DynamicDatabase.cs

@@ -2010,6 +2010,9 @@ namespace DynamORM
         /// releasing, or resetting unmanaged resources.</summary>
         public void Dispose()
         {
+            if (IsDisposed)
+                return;
+
 #if !DYNAMORM_OMMIT_OLDSYNTAX
             List<DynamicTable> tables = TablesCache.Values.ToList();
             TablesCache.Clear();
@@ -2067,6 +2070,8 @@ namespace DynamORM
             if (_proc != null)
                 _proc.Dispose();
 
+            _proc = null;
+            _tempConn = null;
             IsDisposed = true;
         }
 

DynamORM/DynamicProcedureInvoker.cs

@@ -55,6 +55,7 @@ namespace DynamORM
     {
         private DynamicDatabase _db;
         private List<string> _prefixes;
+        private bool _isDisposed;
 
         internal DynamicProcedureInvoker(DynamicDatabase db, List<string> prefixes = null)
         {
@@ -450,6 +451,12 @@ namespace DynamORM
         /// freeing, releasing, or resetting unmanaged resources.</summary>
         public void Dispose()
         {
+            if (_isDisposed)
+                return;
+
+            _isDisposed = true;
+            _db = null;
+            _prefixes = null;
         }
     }
 }

DynamORM/DynamicTable.cs

@@ -954,6 +954,9 @@ namespace DynamORM
         /// freeing, releasing, or resetting unmanaged resources.</summary>
         public void Dispose()
         {
+            if (IsDisposed)
+                return;
+
             // Lose reference but don't kill it.
             if (Database != null)
             {

DynamORM/DynamicTransaction.cs

@@ -174,11 +174,18 @@ namespace DynamORM
         /// freeing, releasing, or resetting unmanaged resources.</summary>
         public void Dispose()
         {
+            if (_isDisposed)
+                return;
+
             _isDisposed = true;
             Rollback();
 
             if (_disposed != null)
                 _disposed();
+
+            _disposed = null;
+            _con = null;
+            _db = null;
         }
 
         /// <summary>Gets a value indicating whether this instance is disposed.</summary>

DynamORM/Helpers/Dynamics/DynamicParser.cs

@@ -1449,6 +1449,9 @@ namespace DynamORM.Helpers.Dynamics
         /// </summary>
         public void Dispose()
         {
+            if (IsDisposed)
+                return;
+
             IsDisposed = true;
 
             if (_uncertainResult != null)