如何解析文件大小到字符串

Question

如何从1024到1kb解析文件的大小？一旦我为它创建了一个函数,就像30行一样充满了if.有更"优雅"的方式吗？我需要使用什么？1kb = 1000b或1kb = 1024b？

Answer 1

这个解决方案看起来并不合理.它有点长,但它确实迎合了exa/petabytes!

C#人类可读文件大小功能

// Returns the human-readable file size for an arbitrary, 64-bit file size
//  The default format is "0.### XB", e.g. "4.2 KB" or "1.434 GB"
public static string GetSizeReadable(long i)
{
    string sign = (i < 0 ? "-" : "");
    double readable = (i < 0 ? -i : i);
    string suffix;
    if (i >= 0x1000000000000000) // Exabyte
    {
        suffix = "EB";
        readable = (double)(i >> 50);
    }
    else if (i >= 0x4000000000000) // Petabyte
    {
        suffix = "PB";
        readable = (double)(i >> 40);
    }
    else if (i >= 0x10000000000) // Terabyte
    {
        suffix = "TB";
        readable = (double)(i >> 30);
    }
    else if (i >= 0x40000000) // Gigabyte
    {
        suffix = "GB";
        readable = (double)(i >> 20);
    }
    else if (i >= 0x100000) // Megabyte
    {
        suffix = "MB";
        readable = (double)(i >> 10);
    }
    else if (i >= 0x400) // Kilobyte
    {
        suffix = "KB";
        readable = (double)i;
    }
    else
    {
        return i.ToString(sign + "0 B"); // Byte
    }
    readable = readable / 1024;

    return sign + readable.ToString("0.### ") + suffix;
}

样本用法

建议将上述函数作为公共静态方法放在帮助器或实用程序类中.

// EXAMPLE OUTPUT
GetSizeReadable(1023); // 1023 B
GetSizeReadable(1024); // 1 KB
GetSizeReadable(1025); // 1.001 KB

// Example of getting a file size and converting it to a readable value
string fileName = "abc.txt";
long fileSize = new System.IO.FileInfo(fileName).Length;
string sizeReadable = GetSizeReadable(fileSize);

Answer 2

也许是这样的？

public string FileSizeAsString(long lengthOfFile)
{
    string[] sizes = { "bytes", "KB", "MB", "GB" };
    int j = 0;

    while (lengthOfFile > 1024 && j < sizes.Length)
    {
        lengthOfFile = lengthOfFile / 1024;
        j++;
    }
    return (lengthOfFile + " " + sizes[j]);
}

用法:

Console.WriteLine(FileSizeAsString(new FileInfo(@"C:\\your_file_here.ext").Length));

您可以根据需要展开字符串数组sizes,它将继续计算.