Überprüfen Sie, ob eine Zeichenfolge ein gültiger Windows-Verzeichnispfad ist

Call Weg.GetFullPath; es werden exceptions werfen, wenn der Pfad ungültig ist.

Verbieten relative Pfade (wie Word), rufen Sie Weg.IsPathRooted.

InformationsquelleAutor der Antwort SLaks

Weg.GetFullPath gibt nachstehende Ausnahmen nur

ArgumentException path ist eine Zeichenfolge der Länge null enthält nur weiß
Raum, oder enthält ein oder mehrere ungültige Zeichen definiert
GetInvalidPathChars.
-oder - Das system konnte nicht abgerufen werden, den absoluten Pfad.

SecurityException Der Aufrufer verfügt nicht über die erforderlichen Berechtigungen verfügen.

ArgumentNullException Pfad ist null.

NotSupportedException-Pfad enthält einen Doppelpunkt ( " :"), die nicht Teil der
ein volume identifier (zum Beispiel "c:\").

PathTooLongException Der angegebene Pfad und /oder der Dateiname überschreiten
die im system definierte maximale Länge. Zum Beispiel, die auf Windows-basierten
Plattformen, die Pfade müssen weniger als 248 Zeichen und Dateinamen müssen
werden weniger als 260 Zeichen.

Alternative Möglichkeit ist die Verwendung der folgenden :

///<summary>
///Validate the Path. If path is relative append the path to the project directory by default.
///</summary>
///<param name="path">Path to validate</param>
///<param name="RelativePath">Relative path</param>
///<param name="Extension">If want to check for File Path</param>
///<returns></returns>
private static bool ValidateDllPath(ref string path, string RelativePath = "", string Extension = "")
{
    //Check if it contains any Invalid Characters.
    if (path.IndexOfAny(Path.GetInvalidPathChars()) == -1)
    {
        try
        {
            //If path is relative take %IGXLROOT% as the base directory
            if (!Path.IsPathRooted(path))
            {
                if (string.IsNullOrEmpty(RelativePath))
                {
                    //Exceptions handled by Path.GetFullPath
                    //ArgumentException path is a zero-length string, contains only white space, or contains one or more of the invalid characters defined in GetInvalidPathChars. -or- The system could not retrieve the absolute path.
                    //
                    //SecurityException The caller does not have the required permissions.
                    //
                    //ArgumentNullException path is null.
                    //
                    //NotSupportedException path contains a colon (":") that is not part of a volume identifier (for example, "c:\"). 
                    //PathTooLongException The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.

                    //RelativePath is not passed so we would take the project path 
                    path = Path.GetFullPath(RelativePath);

                }
                else
                {
                    //Make sure the path is relative to the RelativePath and not our project directory
                    path = Path.Combine(RelativePath, path);
                }
            }

            //Exceptions from FileInfo Constructor:
            //  System.ArgumentNullException:
            //    fileName is null.
            //
            //  System.Security.SecurityException:
            //    The caller does not have the required permission.
            //
            //  System.ArgumentException:
            //    The file name is empty, contains only white spaces, or contains invalid characters.
            //
            //  System.IO.PathTooLongException:
            //    The specified path, file name, or both exceed the system-defined maximum
            //    length. For example, on Windows-based platforms, paths must be less than
            //    248 characters, and file names must be less than 260 characters.
            //
            //  System.NotSupportedException:
            //    fileName contains a colon (:) in the middle of the string.
            FileInfo fileInfo = new FileInfo(path);

            //Exceptions using FileInfo.Length:
            //  System.IO.IOException:
            //    System.IO.FileSystemInfo.Refresh() cannot update the state of the file or
            //    directory.
            //
            //  System.IO.FileNotFoundException:
            //    The file does not exist.-or- The Length property is called for a directory.
            bool throwEx = fileInfo.Length == -1;

            //Exceptions using FileInfo.IsReadOnly:
            //  System.UnauthorizedAccessException:
            //    Access to fileName is denied.
            //    The file described by the current System.IO.FileInfo object is read-only.-or-
            //    This operation is not supported on the current platform.-or- The caller does
            //    not have the required permission.
            throwEx = fileInfo.IsReadOnly;

            if (!string.IsNullOrEmpty(Extension))
            {
                //Validate the Extension of the file.
                if (Path.GetExtension(path).Equals(Extension, StringComparison.InvariantCultureIgnoreCase))
                {
                    //Trim the Library Path
                    path = path.Trim();
                    return true;
                }
                else
                {
                    return false;
                }
            }
            else
            {
                return true;

            }
        }
        catch (ArgumentNullException)
        {
            //  System.ArgumentNullException:
            //    fileName is null.
        }
        catch (System.Security.SecurityException)
        {
            //  System.Security.SecurityException:
            //    The caller does not have the required permission.
        }
        catch (ArgumentException)
        {
            //  System.ArgumentException:
            //    The file name is empty, contains only white spaces, or contains invalid characters.
        }
        catch (UnauthorizedAccessException)
        {
            //  System.UnauthorizedAccessException:
            //    Access to fileName is denied.
        }
        catch (PathTooLongException)
        {
            //  System.IO.PathTooLongException:
            //    The specified path, file name, or both exceed the system-defined maximum
            //    length. For example, on Windows-based platforms, paths must be less than
            //    248 characters, and file names must be less than 260 characters.
        }
        catch (NotSupportedException)
        {
            //  System.NotSupportedException:
            //    fileName contains a colon (:) in the middle of the string.
        }
        catch (FileNotFoundException)
        {
            //System.FileNotFoundException
            // The exception that is thrown when an attempt to access a file that does not
            // exist on disk fails.
        }
        catch (IOException)
        {
            //  System.IO.IOException:
            //    An I/O error occurred while opening the file.
        }
        catch (Exception)
        {
            //Unknown Exception. Might be due to wrong case or nulll checks.
        }
    }
    else
    {
        //Path contains invalid characters
    }
    return false;
}

InformationsquelleAutor der Antwort vCillusion

Hier ist eine Lösung, nutzt den Einsatz von Pfad.GetFullPath wie empfohlen in die Antwort von @SLaks.

In den code, ich bin auch hier, beachten Sie, dass IsValidPath(string path) ist so ausgelegt, dass der Anrufer nicht nicht zu befürchten Ausnahmebehandlung.

Vielleicht finden Sie auch, dass die Methode, die Sie fordert, dass TryGetFullPath(...) auch hat Verdienst, auf seine eigene, wenn Sie wollen sicher zu versuchen, um eine absoluten Pfad.

///<summary>
///Gets a value that indicates whether <paramref name="path"/>
///is a valid path.
///</summary>
///<returns>Returns <c>true</c> if <paramref name="path"/> is a
///valid path; <c>false</c> otherwise. Also returns <c>false</c> if
///the caller does not have the required permissions to access
///<paramref name="path"/>.
///</returns>
///<seealso cref="Path.GetFullPath"/>
///<seealso cref="TryGetFullPath"/>
public static bool IsValidPath(string path)
{
    string result;
    return TryGetFullPath(path, out result);
}

///<summary>
///Returns the absolute path for the specified path string. A return
///value indicates whether the conversion succeeded.
///</summary>
///<param name="path">The file or directory for which to obtain absolute
///path information.
///</param>
///<param name="result">When this method returns, contains the absolute
///path representation of <paramref name="path"/>, if the conversion
///succeeded, or <see cref="String.Empty"/> if the conversion failed.
///The conversion fails if <paramref name="path"/> is null or
///<see cref="String.Empty"/>, or is not of the correct format. This
///parameter is passed uninitialized; any value originally supplied
///in <paramref name="result"/> will be overwritten.
///</param>
///<returns><c>true</c> if <paramref name="path"/> was converted
///to an absolute path successfully; otherwise, false.
///</returns>
///<seealso cref="Path.GetFullPath"/>
///<seealso cref="IsValidPath"/>
public static bool TryGetFullPath(string path, out string result)
{
    result = String.Empty;
    if (String.IsNullOrWhiteSpace(path)) { return false; }
    bool status = false;

    try
    {
        result = Path.GetFullPath(path);
        status = true;
    }
    catch (ArgumentException) { }
    catch (SecurityException) { }
    catch (NotSupportedException) { }
    catch (PathTooLongException) { }

    return status;
}

InformationsquelleAutor der Antwort DavidRR

Ich habe keine Probleme mit diesem code:

private bool IsValidPath(string path, bool exactPath = true)
{
    bool isValid = true;

    try
    {
        string fullPath = Path.GetFullPath(path);

        if (exactPath)
        {
            string root = Path.GetPathRoot(path);
            isValid = string.IsNullOrEmpty(root.Trim(new char[] { '\\', '/' })) == false;
        }
        else
        {
            isValid = Path.IsPathRooted(path);
        }
    }
    catch(Exception ex)
    {
        isValid = false;
    }

    return isValid;
}

Beispielsweise diese würde false zurückgeben:

IsValidPath("C:/abc*d");
IsValidPath("C:/abc?d");
IsValidPath("C:/abc\"d");
IsValidPath("C:/abc<d");
IsValidPath("C:/abc>d");
IsValidPath("C:/abc|d");
IsValidPath("C:/abc:d");
IsValidPath("");
IsValidPath("./abc");
IsValidPath("/abc");
IsValidPath("abc");
IsValidPath("abc", false);

Und diese würde true zurückgeben:

IsValidPath(@"C:\\abc");
IsValidPath(@"F:\FILES\");
IsValidPath(@"C:\\abc.docx\\defg.docx");
IsValidPath(@"C:/abc/defg");
IsValidPath(@"C:\\\//\/\\/\\\/abc/\/\/\/\///\\\//\defg");
IsValidPath(@"C:/abc/def~`!@#$%^&()_-+={[}];',.g");
IsValidPath(@"C:\\\\\abc////////defg");
IsValidPath(@"/abc", false);

InformationsquelleAutor der Antwort Dao Seeker