[英]C# string.format with decimal format.
DriveInfo[] drives = DriveInfo.GetDrives();
for (int i = 0; i < drives.Length; i++)
{
if (drives[i].IsReady)
{
Console.WriteLine("Drive {0} - Has free space of {1} GB",drives[i].ToString(),(drives[i].TotalFreeSpace/1024/1024/1024).ToString("N2"));
}
}
輸出:
Drive C:\ - Has free space of 70,00 GB
Drive D:\ - Has free space of 31,00 GB
Drive E:\ - Has free space of 7,00 GB
Drive F:\ - Has free space of 137,00 GB
全部以,00結尾,但我需要顯示實際大小。 那么哪種格式合適呢?
格式字符串與它無關。 您的整數運算將舍棄任何余數。
3920139012 / 1024 / 1024 / 1024 // 3
使用m
后綴指定小數,如下所示:
3920139012 / 1024m / 1024m / 1024m // 3.6509139575064182281494140625
或者:
3920139012 / Math.Pow(1024, 3) // 3.65091395750642
這可能更清楚一些:
var gb = Math.Pow(1024, 3);
foreach(var drive in DriveInfo.GetDrives())
{
if(drive.IsReady)
{
Console.WriteLine("Drive {0} - Has free space of {1:n2} GB",
drive.Name,
drive.TotalFreeSpace / gb);
}
}
因為您要進行整數除法 ,所以會舍去小數點后的位數。 改用浮點除法:
drives[i].TotalFreeSpace/1024.0/1024.0/1024.0
要么
drives[i].TotalFreeSpace / (1024.0 * 1024.0 * 1024.0)
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