invisible bar code 隐型条码
infrared invisible bar code 红外隐形条码
Setting the Source property on Image does not block running thread till download completes so code will continue executing and your progress bar will be invisible immediately.
设置源房产的形象呢不块运行的线程直到下载完成，代码将继续执行，你将进度条看不见的立即。
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