如何只有当用户停止输入处理TextChanged事件？ [英] How to handle the TextChanged event only when the user stops typing?

问题描述

我有一个文本框与框TextChanged 事件接线。最后，它正在查询到SQL数据库，所以我想限制的查询数量。

I have a TextBox with a TextChanged event wired up. In the end it is making a query to a SQL database, so I want to limit the number of queries.

我只想使查询的如果用户没有按下发言权一个键 .. 300毫秒左右。如果由于某种原因，前面的查询仍在执行，我需要取消，然后发出一个新的查询。

I only want to make the query if the user hasn't pressed a key in say .. 300 milliseconds or so. If for some reason the previous query is still executing, I would need to cancel that, and then issue a new query.

推荐答案

每一个按键后创建一个 System.Windows.Forms.Timer 和复位（如停止然后再启动它）。如果定时器事件被触发，禁止定时器。

Create a System.Windows.Forms.Timer and reset it (e.g. stop then start it) after every keypress. If the timer event is triggered, disable the timer.

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