Exception type(异常类型): HttpException Exception message(异常讯息): Cannot use a leading .
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We should check the exception type, but here we'll just assume it means that no results were found.
我们应该检查异常类型，但此处我们将假定它意味着没有找到相应结果。
Create two UML classes, DrawingSurface and GraphicException, to be used as a parameter type and exception type, respectively, for the sample method.
创建两个uml类，DrawingSurface和GraphicException，分别用做示例方法的参数类型和异常类型。
Catches the most specific exception type.
优先捕获特定的需要处理的异常类型。
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