C# 中的 Excel 自动填充事件

Question

我正在使用 C# 编写一个 Excel 加载项，并且需要能够判断用户何时自动填充单元格。

如何捕获自动填充事件？

Answer 1

以下是我通过粘贴一系列单元格或拖动值来确定单个单元格是否已更改或多个单元格是否已更改的方法，

//Get the currentCell/s changed
        object missing = System.T 
        string currentCell = Target.get_Address(
        missing, missing, Microsoft.Office.Interop.Excel.XlReferenceStyle.xlA1,  missing, missing);


//Split the currentCell variable this aids the logic in getting cell letter and number
         char[] delimiter = new char[] {'
我希望这在某种程度上有助于确定单元格的更改方式。
迪佐斯
};
         string[] CellSplit = currentCell.Split(delimiter);


 //try parse the value in position 1 if this is true then a whole sheet has been pasted and needs to be checked
        //usually will be false if 1 cell is changed or multiple by dragging
        Int32 int32Val;
        bool result;
        result = Int32.TryParse(CellSplit.GetValue(1).ToString).Replace":", ""),System.Globalization.NumberStyles.Integer, null, out int32Val);

  //check the length of the array as this will help in determining how the cells have been changed
        int numCellSplit = CellSplit.Length;

  //the result is false if a single cell was changed and the length is 3
        if (CellSplit.Length == 3 && result == false)
        {
          \\your code here
        }
  //the result is true if the whole sheet has been pasted
        if (CellSplit.Length == 3 && result == true)
        {
          \\your code here
        }

  //if the user dragged the data from one cell across others
        if (CellSplit.Length == 5 && result == false)
        {
            //create char arrays to get the Alphabetical letters to use to loop
            char[] FirstLetter = CellSplit.GetValue(1).ToString().ToCharArray();
            char[] SecondLetter = CellSplit.GetValue(3).ToString().ToCharArray();

            int Alphaletter = (char)FirstLetter.GetValue(0);
            int Betaletter = (char)SecondLetter.GetValue(0);
            //Alphabetical letters have an int value so they can be used to loop through the cells
            for (int CellCheck = Alphaletter; CellCheck <= Betaletter; CellCheck++)
            {
                int LoopStart = int.Parse(CellSplit.GetValue(2).ToString().Replace(":", ""));
                int LoopEnd = int.Parse(CellSplit.GetValue(4).ToString());

                for (; LoopStart <= LoopEnd; LoopStart++)
                {

                    //your code here                        
                }   
            }

        }

我希望这在某种程度上有助于确定单元格的更改方式。

迪佐斯

Answer 2

经过多次尝试，我自己找到了解决方案。该解决方案并不理想，但似乎可行。

确保处理工作表更改事件：

displayWorksheet.Change += new Excel.DocEvents_ChangeEventHandler(CellsChange);

处理该事件的方法应如下所示：

private void CellsChange(Excel.Range Target) 
{
    if ((this.Application.Selection as Excel.Range) != null)
    {
        Excel.Range selectedRange = thisAddIn.Application.Selection as Excel.Range;
        if (selectedRange.Rows.Count > 1)
        {
            //put your code to handle autofill here
        }
    }
}