For each method in your original interface, the asynchronous version must have a matching method with the return type changed to void and an additional parameter of type AsyncCallback.
对于初始接口中的每个方法，异步版本必须有一个返回类型更改为void的匹配方法和一个asynccallback类型的附加参数。
When you type a closing bracket, both it and its matching bracket remain highlighted for a few seconds, or until you type another key or move the cursor.
输入右括号后，右括号和其对称的左括号都会保持反白显示数秒钟，或是直到您按下其他按键或移动游标为止。
When you type a closing bracket, both it and its matching bracket remain highlighted for a few seconds, or until you type another key or move the cursor.
输入右括号后，右括号和其对称的左括号都会保持反白显示数秒钟，或是直到您按下其他按键或移动游标为止。
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