C# 转化文件大小

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转化文件大小，代码如下：

public static string ConvertFileSize(int fileSize)
{
    string outFileSize = string.Empty;
    if (fileSize < 1024)
    {
        outFileSize = String.Format("{0}B", fileSize);
    }
    else if (fileSize < 1024 * 1024)
    {
         outFileSize = String.Format("{0}KB", fileSize / 1024);
    }
    else if (fileSize < 1024 * 1024 * 1024)
    {
         outFileSize = String.Format("{0}MB", fileSize / (1024 * 1024));
    }
    else
    {
         outFileSize = String.Format("{0}GB", fileSize / (1024 * 1024 * 1024));
    }
    return outFileSize;
}