53 lines
1.9 KiB
C#
53 lines
1.9 KiB
C#
using System;
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using System.IO;
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namespace FileManager
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{
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public static class FileUtility
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{
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public static string GetValidFilename(string dirFullPath, string filename, string extension, params string[] metadataSuffixes)
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{
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if (string.IsNullOrWhiteSpace(dirFullPath))
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throw new ArgumentException($"{nameof(dirFullPath)} may not be null or whitespace", nameof(dirFullPath));
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// file max length = 255. dir max len = 247
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// sanitize
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filename = GetAsciiTag(filename);
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// manage length
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if (filename.Length > 50)
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filename = filename.Substring(0, 50) + "[...]";
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// append id. it is 10 or 14 char in the common cases
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if (metadataSuffixes != null && metadataSuffixes.Length > 0)
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filename += " [" + string.Join("][", metadataSuffixes) + "]";
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// this method may also be used for directory names, so no guarantee of extension
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if (!string.IsNullOrWhiteSpace(extension))
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extension = '.' + extension.Trim('.');
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// ensure uniqueness
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var fullfilename = Path.Combine(dirFullPath, filename + extension);
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var i = 0;
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while (File.Exists(fullfilename))
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fullfilename = Path.Combine(dirFullPath, filename + $" ({++i})" + extension);
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return fullfilename;
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}
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public static string GetAsciiTag(string property)
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{
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if (property == null)
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return "";
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// omit characters which are invalid. EXCEPTION: change colon to underscore
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property = property.Replace(':', '_');
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// GetInvalidFileNameChars contains everything in GetInvalidPathChars plus ':', '*', '?', '\\', '/'
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foreach (var ch in Path.GetInvalidFileNameChars())
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property = property.Replace(ch.ToString(), "");
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return property;
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}
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}
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}
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