public static ReactivePropertyValidator <string> IfContainsInvalidPathChars(this ReactivePropertyValidator <string> This, string errorMessage)
{
return(This.IfTrue(str =>
{
// easiest check to make
if (str.ContainsAny(Path.GetInvalidPathChars()))
{
return true;
}
string driveLetter;
try
{
// if for whatever reason you don't have an absolute path
// hopefully you've remembered to use `IfPathNotRooted`
// in your validator
driveLetter = Path.GetPathRoot(str);
}
catch (PathTooLongException)
{
// when you pass in a path that is too long
// you're gonna have a bad time:
// - 260 characters for full path
// - 248 characters for directory name
return false;
}
catch (ArgumentException)
{
// Path.GetPathRoot does some fun things
// around legal combinations of characters that we miss
// by simply checking against an array of legal characters
return true;
}
if (driveLetter == null)
{
return false;
}
// lastly, check each directory name doesn't contain
// any invalid filename characters
var foldersInPath = str.Substring(driveLetter.Length);
return foldersInPath.Split(new[] { '\\', '/' }, StringSplitOptions.None)
.Any(x => x.ContainsAny(Path.GetInvalidFileNameChars()));
}, errorMessage));
}
public static ReactivePropertyValidator <string> IfGitHubDotComHost(
this ReactivePropertyValidator <string> This,
string errorMessage)
{
return(This.IfTrue(s =>
{
try
{
var hostAddress = HostAddress.Create(s);
return hostAddress == HostAddress.GitHubDotComHostAddress;
}
catch (Exception)
{
// A previous validation should probably have caught this.
return false;
}
}, errorMessage));
}
public static ReactivePropertyValidator <string> IfUncPath(this ReactivePropertyValidator <string> This, string errorMessage)
{
return(This.IfTrue(str => str.StartsWith(@"\\", StringComparison.Ordinal), errorMessage));
}
public static ReactivePropertyValidator <string> IfNullOrEmpty(this ReactivePropertyValidator <string> This, string errorMessage)
{
return(This.IfTrue(String.IsNullOrEmpty, errorMessage));
}
public static ReactivePropertyValidator <string> IfMatch(this ReactivePropertyValidator <string> This, string pattern, string errorMessage)
{
var regex = new Regex(pattern);
return(This.IfTrue(regex.IsMatch, errorMessage));
}