将列索引转换为Excel列名称 [英] Translate a column index into an Excel Column Name

问题描述

给定一列列索引，你如何获得Excel列名？

问题比听起来更棘手，因为它只是基于26的不。列不会像正常数字一样包装。即使 Microsoft支持示例也不会扩展到ZZZ之外。

_{免责声明：这是我已经做了一些代码，今天再次遇到我的桌面。我认为这是值得在这里发布的一个预先回答的问题。}

解决方案

我想出的是得到一点递归。这个代码在VB.Net中：

 函数ColumnName（ByVal index As Integer）As String 
静态字符（）作为Char = {Ac，Bc，Cc，Dc，Ec，Fc，Gc，Hc，Ic， Jc，Kc，Lc，Mc，Nc，Oc，Pc，Qc，Rc，Sc， TcUcVcWcXcYcZc} 
 
 index  -  = 1调整它匹配0索引数组而不是1索引列
 
 Dim商为整数=索引\ 26'/正常/运算符轮。 \做整数除法，截断
如果商> 0然后
 ColumnName = ColumnName（商）& chars（index Mod 26）
 Else 
 ColumnName = chars（index Mod 26）
 End If 
 End Function 
  

在C＃中：

  string ColumnName（int index）
 {
 index  -  = 1; //调整，使其与0索引数组匹配，而不是1索引列
 
 int quotient = index / 26; 
 if（商> 0）
返回ColumnName（商）+ chars [index％26] .ToString（）; 
 else 
返回chars [index％26] .ToString（）; 
} 
 private char [] chars = new char [] {'A'，'B'，'C'，'D'，'E'，'F'，'G' ''''''''''''''''''''''''''''''''''' 'U'，'V'，'W'，'X'，'Y'，'Z'}; 
  

它使用1索引列而不是0索引的唯一缺点。

Given a columns' index, how can you get an Excel column name?

The problem is trickier than it sounds because it's not just base-26. The columns don't wrap over like normal digits would. Even the Microsoft Support Example doesn't scale beyond ZZZ.

_{Disclaimer: This is some code I had done a while back, and it came across my desktop again today. I thought it was worthy of posting here as a pre-answered question.}

解决方案

The answer I came up with is to get a little recursive. This code is in VB.Net:

Function ColumnName(ByVal index As Integer) As String
        Static chars() As Char = {"A"c, "B"c, "C"c, "D"c, "E"c, "F"c, "G"c, "H"c, "I"c, "J"c, "K"c, "L"c, "M"c, "N"c, "O"c, "P"c, "Q"c, "R"c, "S"c, "T"c, "U"c, "V"c, "W"c, "X"c, "Y"c, "Z"c}

        index -= 1 ''//adjust so it matches 0-indexed array rather than 1-indexed column

        Dim quotient As Integer = index \ 26 ''//normal / operator rounds. \ does integer division, which truncates
        If quotient > 0 Then
               ColumnName = ColumnName(quotient) & chars(index Mod 26)
        Else
               ColumnName = chars(index Mod 26)
        End If
End Function

And in C#:

string ColumnName(int index)
{
    index -= 1; //adjust so it matches 0-indexed array rather than 1-indexed column

    int quotient = index / 26;
    if (quotient > 0)
        return ColumnName(quotient) + chars[index % 26].ToString();
    else
        return chars[index % 26].ToString();
}
private char[] chars = new char[] {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};

The only downside it that it uses 1-indexed columns rather than 0-indexed.

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