public static ValidationRule <string> FileExists(this ValidationRule <string> rule, string message = "File must exist")
{
rule.NotNullOrWhiteSpace();
if (!File.Exists(rule.Value))
{
throw new FileNotFoundException(message, rule.Value);
}
return(rule);
}
public static ValidationRule <string> DirectoryExists(this ValidationRule <string> rule, string message = null)
{
rule.NotNullOrWhiteSpace();
if (Directory.Exists(rule.Value))
{
return(rule);
}
if (message == null)
{
message = $"Directory \"{rule.Value}\" must exist";
}
throw new DirectoryNotFoundException(message);
}