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);
}
/// <summary>
/// Checks that the given string is equal to the passed string.
/// </summary>
/// <param name="rule">rule on which it should be asserted.</param>
/// <param name="value">The value the asserted value should have</param>
/// <param name="comparison">The comparison behavior</param>
/// <returns>The validation rule.</returns>
/// /// <exception cref="ArgumentException">If the asserted string isn't equal to the given strign</exception>
public static ValidationRule <string> Equal(this ValidationRule <string> rule, string value,
StringComparison comparison, string message = null)
{
if (string.Equals(rule.Value, value, comparison))
{
return(rule);
}
message = message ?? "Value must not be null or empty!";
throw new ArgumentException(rule.Name, message);
}
/// <summary>
/// Asserts that the given string is at least as long as the given length.
/// </summary>
/// <param name="rule">rule on which it should be asserted.</param>
/// <param name="length">minimal length of the string.</param>
/// <returns>The validation rule.</returns>
public static ValidationRule <string> MinLength(this ValidationRule <string> rule, int length, string message = null)
{
if (!string.IsNullOrWhiteSpace(rule.Value) && rule.Value.Length >= length)
{
return(rule);
}
message = message ?? $"The value should be at least {length} characters long!";
throw new ArgumentOutOfRangeException(rule.Name, rule.Value.Length, message);
}
/// <summary>
/// Checks that the given string is not null or whitespace
/// </summary>
/// <param name="rule">rule on which it should be asserted.</param>
/// <returns>The validation rule.</returns>
/// <exception cref="ArgumentNullException">If the asserted string is null</exception>
/// <exception cref="ArgumentException">If the asserted string is empty or whitespaces only</exception>
public static ValidationRule <string> NotNullOrWhiteSpace(this ValidationRule <string> rule)
{
if (rule.Value == null)
{
throw new ArgumentNullException(rule.Name, "Value must not be null!");
}
if (string.IsNullOrWhiteSpace(rule.Value))
{
throw new ArgumentException(rule.Name, "Value must not be null or empty!");
}
return(rule);
}
public static ValidationRule <ICollection <T> > NotNullOrEmpty <T>(this ValidationRule <ICollection <T> > rule)
{
if (rule.Value == null)
{
throw new ArgumentException("The collection must not be null!", rule.Name);
}
if (!rule.Value.HasAny())
{
throw new ArgumentException("The enumerable should have items!", rule.Name);
}
return(rule);
}
public static ValidationRule <ICollection> HasExact(this ValidationRule <ICollection> rule, int expectedCount, string message = null)
{
if (rule.Value.Count == expectedCount)
{
return(rule);
}
if (message == null)
{
message = $"The collection must have exact {expectedCount} items.";
}
throw new ArgumentOutOfRangeException(rule.Name, rule.Value.Count, message);
}
public static ValidationRule <ICollection> HasAtMost(this ValidationRule <ICollection> rule, int maximumCount, string message = null)
{
if (rule.Value.Count <= maximumCount)
{
return(rule);
}
if (message == null)
{
message = $"The collection must have at most {maximumCount} items.";
}
throw new ArgumentOutOfRangeException(rule.Name, rule.Value.Count, message);
}
/// <summary>
/// Checks that the given string is not null or empty
/// </summary>
/// <param name="rule">rule on which it should be asserted.</param>
/// <returns>The validation rule.</returns>
/// <exception cref="ArgumentNullException">If the asserted string is null</exception>
/// <exception cref="ArgumentException">If the asserted string is empty</exception>
public static ValidationRule <string> NotNullOrEmpty(this ValidationRule <string> rule, string message = null)
{
if (rule.Value == null)
{
throw new ArgumentNullException(rule.Name, message ?? "Value must not be null!");
}
if (string.IsNullOrEmpty(rule.Value))
{
throw new ArgumentException(rule.Name, message ?? "Value must not be null or empty!");
}
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);
}