如何创建使用类似于C＃中的配置文件的扩展方法
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我正在尝试创建一种使用时如下所示的方法：
Dialog (var d = new MyDialog())
{
d.DoSomethingToAVisibleDialogThatAppearedInTheDialog(); //Call
}
没有找到相关结果
已邀请:
3 个回复
糕泰灌
class DisposableWrapper<T> : where T : IDisposable { T _wrapped; private bool _disposed; public DisposableWrapper(T wrapped) { _wrapped = wrapped; } public T Item { get { return _wrapped; } } public ~DisposableWrapper() { Dispose(false); GC.SuppressFinalize(this); } public void Dispose() { Dispose(true); } protected virtual void Dispose(bool disposing) { if (_disposed) return; if (disposing) { _disposed = true; ((IDisposable)_wrapped).Dispose(); // do extra stuff } } }using (var wrapper = new DisposableWrapper(new Dialog()) { Dialog d = wrapper.Item; // do stuff }帆攀缺锯欧
是一种语言功能，特定于。无法针对不同的语义直接扩展它。您要尝试的基本上是为该语言添加新功能，而这是不可能的。 最好的选择通常是提供一个动作，理想情况下是采用约束为“ 5”的通用方法。public static void Dialog<T>(Action<T> action) where T: IDialog, new() { var d = new T(); try { action(d); } finally { var idialog = d as IDialog; if (idialog != null) { idialog.Dispose(); // Or whatever IDialog method(s) you want } } }澜悍景哭苟
public class StreamPositionRestorer : ResourceReleaser<long> { public StreamPositionRestorer(Stream s) : base(s.Position, x => s.Seek(x)) { } }using (var restorer = new StreamPositionRestorer(stm)) { // code that mucks with the stream all it wants... } // at this point the stream position has been returned to the original point