C# 格式化顯示金額函數

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??

格式化金額
10000000 -> 1000,000,0

 

public string FormatAmount(decimal? amount = null)        {            amount = amount ?? Amount;            var s = amount.ToString();            if (s.Length < 2)            {                return s;            }            var len = s.IndexOf(‘.‘);            if (len < 0)            {                len = s.Length;            }            if (len < 4)            {                return s;            }            for (var i = 1; i < len; i += 3)            {                s = s.Insert(i, ",");                i++;                len++;            }            return s;        }

C# 格式化顯示金額函數