Note: much of this section is commented out by default, so make sure that you add your font data so that it's not commented out.

注意：这部分大多注释为默认值，所以确定你加入了你的字体数据，这样它就不会被注释了。

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The guidelines often dictate how to format different types of data or what color and font to use for text.

这些指导原则往往会规定如何设置不同类型数据的格式，或文本应采用哪种颜色和字体。

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These handlers are called throughout the generation and rendering process and allow modification of report properties, like changing font colors, the data value, and calling external code.

我们可以在报表产生和渲染阶段调用这些事件处理器，并且这些事件处理器还能修改报表属性，比如改变字体颜色，数据值以及调用外部代码。

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