处理文件属性 C#

Question

我想使用 C# 获取任何给定文件的文件大小，如果可能的话，我需要以 GB、MB、KB 和字节为单位显示它......

对于音频 (mp3) 文件，我需要获取该文件的持续时间文件 ...

Answer 1

您可以使用 FileInfo.Length 获取文件的大小（以字节为单位）。然后简单的计算就可以告诉您 KB、MB 和 GB：

string fileName = "C:\Path\to\file.txt";
var fileInfo = new FileInfo(fileName);

Console.WriteLine("Length = {0} bytes", fileInfo.Length);
Console.WriteLine("      or {0} KB", fileInfo.Length / 1024);
Console.WriteLine("      or {0} MB", fileInfo.Length / 1024 / 1024);
Console.WriteLine("      or {0} GB", fileInfo.Length / 1024 / 1024 / 1024);

要获取 mp3 文件的持续时间，您需要使用库（例如 TagLib#) 支持读取 mp3 文件的标头以解析出持续时间。

Answer 2

试试这个：

public class FileSizeFormatProvider : IFormatProvider, ICustomFormatter
    {
        public object GetFormat(Type formatType)
        {
            if (formatType == typeof(ICustomFormatter)) return this;
            return null;
        }

        private const string fileSizeFormat = "fs";
        private const Decimal OneKiloByte = 1024M;
        private const Decimal OneMegaByte = OneKiloByte * 1024M;
        private const Decimal OneGigaByte = OneMegaByte * 1024M;

        public string Format(string format, object arg, IFormatProvider formatProvider)
        {
            if (format == null || !format.StartsWith(fileSizeFormat))
            {
                return defaultFormat(format, arg, formatProvider);
            }

            if (arg is string)
            {
                return defaultFormat(format, arg, formatProvider);
            }

            Decimal size;

            try
            {
                size = Convert.ToDecimal(arg);
            }
            catch (InvalidCastException)
            {
                return defaultFormat(format, arg, formatProvider);
            }

            string suffix;
            if (size > OneGigaByte)
            {
                size /= OneGigaByte;
                suffix = "GB";
            }
            else if (size > OneMegaByte)
            {
                size /= OneMegaByte;
                suffix = "MB";
            }
            else if (size > OneKiloByte)
            {
                size /= OneKiloByte;
                suffix = "kB";
            }
            else
            {
                suffix = " B";
            }

            string precision = format.Substring(2);
            if (String.IsNullOrEmpty(precision)) precision = "2";
            return String.Format("{0:N" + precision + "}{1}", size, suffix);

        }

        private static string defaultFormat(string format, object arg, IFormatProvider formatProvider)
        {
            IFormattable formattableArg = arg as IFormattable;
            if (formattableArg != null)
            {
                return formattableArg.ToString(format, formatProvider);
            }
            return arg.ToString();
        }

    }

在主类中这样调用它：

public static void Main()
        {
            FileInfo fInfo = new FileInfo(@"D:\Songs\housefull01(www.songs.pk).mp3");
  Console.WriteLine(String.Format(new FileSizeFormatProvider(), "File size: {0:fs}", fInfo.Length));
        }

Answer 3

确定文件大小：

FileInfo fileInfo = new FileInfo(fileName);
Console.WriteLine("Length = " + fileInfo.Length.toString());

您必须根据需要转换该值。