11 2022 档案
摘要:以下为MainActivity中代码 using System; using Android.App; using Android.Content.PM; using Android.Runtime; using Android.OS; using XamrinScanner.Services; u
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摘要:加同步锁前后两次判断实例是否已存在(可行,但不推荐) public sealed class Singleton3 { private Singleton3() { } private static object syncObj = new object(); private static Sing
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