如何对包含文件大小数据的列表视图列进行排序？ C＃

我想对 ListView 列中的项目进行排序，我已经做到了，但是...我无法使用列中的数据类型进行排序（见图），有人知道如何做到这一点吗？

为排序函数编写一个自定义比较器，如下所示：

    /// <summary>
    /// Comparator for values like 123 KB
    /// </summary>
    /// <param name="x">First value to compare</param>
    /// <param name="y">Second value to compare</param>
    /// <returns>0 for equal, 1 for x &gt; y, -1 for x &lt; y</returns>
    int Compare(object x, object y)
    {
        // Convert to strings
        string strX = null;
        if (x is string)
            strX = (string)x;
        else if (x != null)
            strX = x.ToString();
        string strY = null;
        if (y is string)
            strY = (string)y;
        else if (y != null)
            strY = y.ToString();

        // Nulls first (null means less, since it's blank)
        if (strX == null)
        {
            if (strY == null)
                return 0;
            return -1;
        }
        else if (strY == null)
            return 1;

        // Convert the non-KB part to a number
        double numX;
        double numY;
        if (strX.EndsWith("KB") || strX.EndsWith("GB") || strX.EndsWith("MB"))
            strX = strX.Substring(0, strX.Length - 2);
        if (strX.EndsWith("Bytes"))
            strX = strX.Substring(0, strX.Length - 5);
        strX = strX.Trim();
        double.TryParse(strX, out numX);
        if (strY.EndsWith("KB") || strY.EndsWith("GB") || strY.EndsWith("MB"))
            strY = strY.Substring(0, strY.Length - 2);
        if (strY.EndsWith("Bytes"))
            strY = strX.Substring(0, strY.Length - 5);
        strY = strY.Trim();
        double.TryParse(strY, out numY);

        // Compare the numbers
        return numX.CompareTo(numY);
    }