C# 如何简化列数到列Alpha表示函数?
我有一个遗留代码:C# 如何简化列数到列Alpha表示函数?,c#,excel-interop,alphabetical,alphanumeric,C#,Excel Interop,Alphabetical,Alphanumeric,我有一个遗留代码: private Worksheet _xlSheet; . . . _xlSheet.PageSetup.PrintArea = "A1:" + GetExcelTextColumnName(_grandTotalsColumn) + finalRow; . . . protected string GetExcelTextColumnName(int columnNum) { StringBuilder sb = new StringBuilder();
private Worksheet _xlSheet;
. . .
_xlSheet.PageSetup.PrintArea = "A1:" +
GetExcelTextColumnName(_grandTotalsColumn) + finalRow;
. . .
protected string GetExcelTextColumnName(int columnNum)
{
StringBuilder sb = new StringBuilder();
if (columnNum > 26)
{
int firstLetter = ((columnNum - 1) / 26) + 64;
int secondLetter = ((columnNum - 1) % 26) + 65;
sb.Append((char)firstLetter);
sb.Append((char)secondLetter);
}
else
{
sb.Append((char)(64 + (columnNum - 1)));
}
return sb.ToString();
}
我将代码简化到这样的程度:
_xlSheet.PageSetup.PrintArea = "A1:" + GetExcelTextColumnName(_xlSheet.UsedRange.Columns.Count) + _xlSheet.UsedRange.Rows.Count;
…但想知道是否有办法简化“列编号到列Alpha”的代码。是否存在,或者现有的GetExcelTextColumnName()是否真的优雅、简洁且可维护?我将使用迭代算法,它将支持ZZ以外的列,而ZZ是您在最新版本的Excel中找到的
private const string Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
public string GetColumnName(int columnIndex)
{
if (columnIndex < 0) throw new ArgumentOutOfRangeException("columnIndex", columnIndex, "Column index index may not be negative.");
string result = "";
for (; ; )
{
result = Alphabet[(columnIndex) % 26] + result;
if (columnIndex < 26) break;
columnIndex = columnIndex / 26 - 1;
}
return result;
}
这是递归算法的完美例子;我所做的唯一更改是将“const”更改为“static readonly”
_xlSheet.PageSetup.PrintArea =
_xlSheet.Range("A1")
.Resize(finalRow, _grandTotalsColumn).Address;