Merge pull request MapsterMapper#311 from cmann-andagon/nested-async-fix

Fix issue regarding nested use of AdaptToTypeAsync

src/Mapster.Core/MapContext/MapContextScope.cs

@@ -7,22 +7,31 @@ public class MapContextScope : IDisposable
  {
  public MapContext Context { get; }
 
- private readonly bool _isRootScope;
+ private readonly MapContext? _oldContext;
+
  public MapContextScope()
  {
- var context = MapContext.Current;
- if (context == null)
+ _oldContext = MapContext.Current;
+
+ this.Context = new MapContext();
+ if (_oldContext != null)
  {
- _isRootScope = true;
- MapContext.Current = context = new MapContext();
+ foreach (var parameter in _oldContext.Parameters)
+ {
+ this.Context.Parameters[parameter.Key] = parameter.Value;
+ }
+ foreach (var reference in _oldContext.References)
+ {
+ this.Context.References[reference.Key] = reference.Value;
+ }
  }
- this.Context = context;
+
+ MapContext.Current = this.Context;
  }
 
  public void Dispose()
  {
- if (_isRootScope && ReferenceEquals(MapContext.Current, this.Context))
- MapContext.Current = null;
+ MapContext.Current = _oldContext;
  }
 
  public static TResult GetOrAddMapReference<TResult>(ReferenceTuple key, Func<ReferenceTuple, TResult> mapFn) where TResult : notnull