标签:释放 return expr mce Walk Add obj 辅助 COM
/* com组件,object对象释放, ref: https://www.codenong.com/2191489/ using (var coms = new ReleaseWrapper()) { var fso = coms.Add(new FileSystemObject()); var dir1 = coms.Add(() => new FileSystemObject().Drives["c"].RootFolder); } */ class ReleaseWrapper : IDisposable { readonly List<object> m_Coms = new List<object>(); readonly List<IDisposable> m_NetObjs = new List<IDisposable>(); public T Add<T>(Expression<Func<T>> func) { return (T)Walk(func.Body); } public T Add<T>(T obj) { if (obj != null) { if (Marshal.IsComObject(obj)) { m_Coms.Add(obj); } else { IDisposable iDis = obj as IDisposable; if (iDis != null) { m_NetObjs.Add(iDis); } } } return obj; } object Walk(Expression expr) { return WalkImpl(expr); } object[] Walk(IEnumerable<Expression> args) { if (args == null) return null; return args.Select(arg => Walk(arg)).ToArray(); } object WalkImpl(Expression expr) { Debug.WriteLine(expr?.NodeType); //Debug.WriteLine(expr.ToString()); switch (expr.NodeType) { case ExpressionType.Constant: return ((ConstantExpression)expr).Value; case ExpressionType.New: NewExpression ne = (NewExpression)expr; return ne.Constructor.Invoke(Walk(ne.Arguments)); case ExpressionType.MemberAccess: MemberExpression me = (MemberExpression)expr; object target = Walk(me.Expression); switch (me.Member.MemberType) { case MemberTypes.Field: return ((FieldInfo)me.Member).GetValue(target); case MemberTypes.Property: return Add(((PropertyInfo)me.Member).GetValue(target, null)); default: throw new NotSupportedException(); } case ExpressionType.Call: { MethodCallExpression mce = (MethodCallExpression)expr; object obj; if (mce.Object == null) { obj= mce.Method.Invoke(mce.Object, Walk(mce.Arguments)); } else { obj= mce.Method.Invoke(Walk(mce.Object), Walk(mce.Arguments)); } return Add(obj); } case ExpressionType.Convert: { UnaryExpression uex = expr as UnaryExpression; object obj = Walk(uex.Operand); if (obj as IConvertible == null) { return obj; } else { return Convert.ChangeType(obj, uex.Operand.Type); } } default: throw new NotSupportedException(); } } public void Dispose() { Debug.WriteLine($"Com Count:{m_Coms.Count}"); for (int i = m_Coms.Count - 1; i >= 0; i--) { Marshal.ReleaseComObject(m_Coms[i]); //Debug.WriteLine("Released:" + m_Coms[i]); } m_Coms.Clear(); for (int i = m_NetObjs.Count - 1; i >= 0; i--) { m_NetObjs[i].Dispose(); } m_NetObjs.Clear(); } }
标签:释放,return,expr,mce,Walk,Add,obj,辅助,COM 来源: https://www.cnblogs.com/otoboku/p/16200331.html
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