ondraw函数使用尺寸调整函数来绘制面板的线条和所有已经选定的x和o。
The onDraw function USES the sizing functions to both draw the lines of the board and draw any played Xs and Os.
在加载更多的程序集并转化IL为机器指令时，CLR的加载器有一点额外的工作要完成，那就是调整函数入口地址。
The CLR loader has a little more work to do to load many assemblies and turn IL into machine instructions, particularly resolving function addresses.
清单4中的代码就使用这个函数调整列宽。
The code shown in listing 4 USES just such a function to adjust the column widths.
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