为什么.net不让我们跨线程操作控件,这是有好处的。因为如果你的线程多了,那么当两个线程同时尝试将一个控件变为自己需要的状态时,线程的死锁就会发生。但是难道就是因为这个原因,我们就只能让程序卡着么?当然不是,这里教大家一个解决方案:用BackGroundWorker
这里通过一个实例来告诉大家BackGroundWorker的用法。
首先我们先定义一个BackGroundWorker,大家可以去面板上拖一个,也可以自己手工定义一个。
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this.backgroundWorker_Combo.DoWork += new System.ComponentModel.DoWorkEventHandler(this.backgroundWorker_Combo_DoWork);//让backgroundWorker做的事
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然后再在RunWorkerCompleted事件上双击,添加那些你想往控件里操作的代码。
这里有一个开发实例,讲的是实现类似Google搜索中下拉列表的实现。其思路是在DoWork中搜索数据库,在Completed中将搜出来的东西放进去。
本文需要一个backgroundWorker,一个ComboBox控件
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