当我选择一个单元格时，相应的列就会获得焦点。因为我需要在Excel工作表中在焦点变化时获得列值和行值（行号）。
我如何通过守则这样做?
如何在使用C＃的VSTO Excel中获取焦点或当前单元格的列值？
Excel.Range rng = (Excel.Range) this.Application.ActiveCell;
//get the cell value
object cellValue = rng.Value;
//get the row and column details
int row = rng.Row;
int column = rng.Column;
这里有一个快速入门步骤：Microsoft Office Excel编程使用VSTO。
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