文件大小单位换算

 1             long g = 1024 * 1024 * 1024;
 2             long m = 1024 * 1024;
 3             long k = 1024;
 4             if (size < k && size >= 1)
 5             {
 6                 ShowMsg(message + size.ToString("0.00") + "B");
 7             }
 8             else if (size < m && size >= 1024)
 9             {
10                 ShowMsg(message + (size / k).ToString("0.00") + "KB");
11             }
12             else if (size < g && size >= m)
13             {
14                 ShowMsg(message + (size / m).ToString("0.00") + "MB");
15             }
16             else if (size >= g)
17             {
18                 ShowMsg(message + (size / g).ToString("0.00") + "GB");
19             }