close readers *before* recycling - required for npgsql

src/Dapper.AOT/CommandT.Query.cs

@@ -51,7 +51,7 @@ public List<TRow> QueryBuffered<TRow>(TArgs args, [DapperAot] RowFactory<TRow>?
 
             // consume entire results (avoid unobserved TDS error messages)
             while (state.Reader.NextResult()) { }
-            PostProcessAndRecycle(ref state, args, state.Reader.RecordsAffected);
+            PostProcessAndRecycle(ref state, args, state.Reader.CloseAndCapture());
             return results;
         }
         finally
@@ -90,7 +90,7 @@ public async Task<List<TRow>> QueryBufferedAsync<TRow>(TArgs args, [DapperAot] R
 
             // consume entire results (avoid unobserved TDS error messages)
             while (await state.Reader.NextResultAsync(cancellationToken)) { }
-            PostProcessAndRecycle(state, args, state.Reader.RecordsAffected);
+            PostProcessAndRecycle(state, args, await state.Reader.CloseAndCaptureAsync());
             return results;
         }
         finally
@@ -122,7 +122,7 @@ public async IAsyncEnumerable<TRow> QueryUnbufferedAsync<TRow>(TArgs args, [Dapp
             }
             // consume entire results (avoid unobserved TDS error messages)
             while (await state.Reader.NextResultAsync(cancellationToken)) { }
-            PostProcessAndRecycle(state, args, state.Reader.RecordsAffected);
+            PostProcessAndRecycle(state, args, await state.Reader.CloseAndCaptureAsync());
         }
         finally
         {
@@ -152,7 +152,7 @@ public IEnumerable<TRow> QueryUnbuffered<TRow>(TArgs args, [DapperAot] RowFactor
             }
             // consume entire results (avoid unobserved TDS error messages)
             while (state.Reader.NextResult()) { }
-            PostProcessAndRecycle(ref state, args, state.Reader.RecordsAffected);
+            PostProcessAndRecycle(ref state, args, state.Reader.CloseAndCapture());
         }
         finally
         {
@@ -198,7 +198,7 @@ static CommandBehavior SingleFlags(OneRowFlags flags)
 
             // consume entire results (avoid unobserved TDS error messages)
             while (state.Reader.NextResult()) { }
-            PostProcessAndRecycle(ref state, args, state.Reader.RecordsAffected);
+            PostProcessAndRecycle(ref state, args, state.Reader.CloseAndCapture());
             return result;
         }
         finally
@@ -241,7 +241,7 @@ static CommandBehavior SingleFlags(OneRowFlags flags)
 
             // consume entire results (avoid unobserved TDS error messages)
             while (await state.Reader.NextResultAsync(cancellationToken)) { }
-            PostProcessAndRecycle(state, args, state.Reader.RecordsAffected);
+            PostProcessAndRecycle(state, args, await state.Reader.CloseAndCaptureAsync());
             return result;
         }
         finally

src/Dapper.AOT/Internal/CommandUtils.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Data.Common;
 using System.Diagnostics;
 using System.Globalization;
 using System.Runtime.CompilerServices;
@@ -54,6 +55,33 @@ internal static bool IsCompletedSuccessfully(this Task task)
 #endif
     }
 
+    [MethodImpl(AggressiveOptions)]
+    internal static int CloseAndCapture(this DbDataReader? reader)
+    {
+        if (reader is null) return -1;
+        var count = reader.RecordsAffected;
+        reader.Close();
+        return count;
+    }
+
+    [MethodImpl(AggressiveOptions)]
+    internal static ValueTask<int> CloseAndCaptureAsync(this DbDataReader? reader)
+    {
+#if NETCOREAPP3_1_OR_GREATER
+        if (reader is null) return new(-1);
+        var count = reader.RecordsAffected;
+        var pending = reader.CloseAsync();
+        return pending.IsCompletedSuccessfully ? new(count) : Deferred(pending, count);
+        static async ValueTask<int> Deferred(Task pending, int count)
+        {
+            await pending;
+            return count;
+        }
+#else
+        return new(CloseAndCapture(reader));
+#endif
+    }
+
     [MethodImpl(MethodImplOptions.NoInlining)]
     private static void ThrowNull() => throw new ArgumentNullException("value");
 

src/Dapper.AOT/WrappedDbDataReader.cs

@@ -49,7 +49,7 @@ public sealed override void Close()
             var state = this.state; // snapshot
             if (state is not null)
             {
-                commandFactory.PostProcessObject(new(state.Command!), args, state.Reader?.RecordsAffected ?? -1);
+                commandFactory.PostProcessObject(new(state.Command!), args, state.Reader.CloseAndCapture());
                 if (commandFactory.TryRecycle(state.Command!))
                 {
                     state.Command = null;
@@ -229,7 +229,7 @@ private async Task CloseAsyncImpl()
             var state = this.state; // snapshot
             if (state is not null)
             {
-                commandFactory.PostProcessObject(new(state.Command!), args, state.Reader?.RecordsAffected ?? -1);
+                commandFactory.PostProcessObject(new(state.Command!), args, await state.Reader.CloseAndCaptureAsync());
                 if (commandFactory.TryRecycle(state.Command!))
                 {
                     state.Command = null;