我需要一个强大的和简单的方法来删除非法的路径和文件字符从一个简单的字符串。我已经使用了下面的代码,但它似乎没有做任何事情,我错过了什么?

using System;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string illegal = "\"M<>\"\\a/ry/ h**ad:>> a\\/:*?\"<>| li*tt|le|| la\"mb.?";

            illegal = illegal.Trim(Path.GetInvalidFileNameChars());
            illegal = illegal.Trim(Path.GetInvalidPathChars());

            Console.WriteLine(illegal);
            Console.ReadLine();
        }
    }
}

当前回答

抛出异常。

if ( fileName.IndexOfAny(Path.GetInvalidFileNameChars()) > -1 )
            {
                throw new ArgumentException();
            }

其他回答

我写这个怪物是为了好玩,它让你可以往返:

public static class FileUtility
{
    private const char PrefixChar = '%';
    private static readonly int MaxLength;
    private static readonly Dictionary<char,char[]> Illegals;
    static FileUtility()
    {
        List<char> illegal = new List<char> { PrefixChar };
        illegal.AddRange(Path.GetInvalidFileNameChars());
        MaxLength = illegal.Select(x => ((int)x).ToString().Length).Max();
        Illegals = illegal.ToDictionary(x => x, x => ((int)x).ToString("D" + MaxLength).ToCharArray());
    }

    public static string FilenameEncode(string s)
    {
        var builder = new StringBuilder();
        char[] replacement;
        using (var reader = new StringReader(s))
        {
            while (true)
            {
                int read = reader.Read();
                if (read == -1)
                    break;
                char c = (char)read;
                if(Illegals.TryGetValue(c,out replacement))
                {
                    builder.Append(PrefixChar);
                    builder.Append(replacement);
                }
                else
                {
                    builder.Append(c);
                }
            }
        }
        return builder.ToString();
    }

    public static string FilenameDecode(string s)
    {
        var builder = new StringBuilder();
        char[] buffer = new char[MaxLength];
        using (var reader = new StringReader(s))
        {
            while (true)
            {
                int read = reader.Read();
                if (read == -1)
                    break;
                char c = (char)read;
                if (c == PrefixChar)
                {
                    reader.Read(buffer, 0, MaxLength);
                    var encoded =(char) ParseCharArray(buffer);
                    builder.Append(encoded);
                }
                else
                {
                    builder.Append(c);
                }
            }
        }
        return builder.ToString();
    }

    public static int ParseCharArray(char[] buffer)
    {
        int result = 0;
        foreach (char t in buffer)
        {
            int digit = t - '0';
            if ((digit < 0) || (digit > 9))
            {
                throw new ArgumentException("Input string was not in the correct format");
            }
            result *= 10;
            result += digit;
        }
        return result;
    }
}

上面的大多数解决方案都将路径和文件名的非法字符组合在一起,这是错误的(即使两个调用当前返回相同的字符集)。我将首先在path和filename中分割path+filename,然后应用适当的集,如果它们,然后再次结合两者。

wvd_vegt

public static bool IsValidFilename(string testName)
{
    return !new Regex("[" + Regex.Escape(new String(System.IO.Path.GetInvalidFileNameChars())) + "]").IsMatch(testName);
}

你可以像这样使用Linq删除非法字符:

var invalidChars = Path.GetInvalidFileNameChars();

var invalidCharsRemoved = stringWithInvalidChars
.Where(x => !invalidChars.Contains(x))
.ToArray();

编辑 以下是评论中提到的经过必要编辑后的效果:

var invalidChars = Path.GetInvalidFileNameChars();

string invalidCharsRemoved = new string(stringWithInvalidChars
  .Where(x => !invalidChars.Contains(x))
  .ToArray());

从用户输入中删除非法字符的最佳方法是使用Regex类替换非法字符,在代码后面创建方法,或者在客户端使用RegularExpression控件进行验证。

public string RemoveSpecialCharacters(string str)
{
    return Regex.Replace(str, "[^a-zA-Z0-9_]+", "_", RegexOptions.Compiled);
}

OR

<asp:RegularExpressionValidator ID="regxFolderName" 
                                runat="server" 
                                ErrorMessage="Enter folder name with  a-z A-Z0-9_" 
                                ControlToValidate="txtFolderName" 
                                Display="Dynamic" 
                                ValidationExpression="^[a-zA-Z0-9_]*$" 
                                ForeColor="Red">