public static bool StringMaxLength(object target, ValidationRuleArgs e)
{
MaxLengthRuleArgs args = e as MaxLengthRuleArgs;
if (args == null)
{
throw new ArgumentException("Invalid ValidationRuleArgs. e must be of type MaxLengthRuleArgs.");
}
int maxLength = args.MaxLength;
PropertyInfo property = target.GetType().GetProperty(e.PropertyName);
if (property == null)
{
throw new ArgumentException(string.Format("Property \"{0}\" not found on object \"{1}\"", e.PropertyName, target.GetType().ToString()));
}
if (property.PropertyType != typeof(string))
{
throw new ArgumentException(string.Format("Property \"{0}\" is not of type String.", e.PropertyName));
}
string text = (string)property.GetValue(target, null);
if (!string.IsNullOrEmpty(text) && (text.Length > maxLength))
{
if (string.IsNullOrEmpty(e.Description))
{
e.Description = string.Format("{0} can not exceed {1} characters", e.PropertyName, maxLength.ToString());
}
return(false);
}
return(true);
}
/// <summary>
/// Rule ensuring a String value doesn't exceed
/// a specified length.
/// </summary>
/// <param name="target">Object containing the data to validate.</param>
/// <param name="e"><see cref="ValidationRuleArgs"/> containing the information about the object to be validated.</param>
/// <returns>False if the rule is broken; true otherwise.</returns>
/// <remarks>
/// This implementation uses late binding, and will only work
/// against String property values.
/// </remarks>
public static bool StringMaxLength(object target, ValidationRuleArgs e)
{
MaxLengthRuleArgs args = e as MaxLengthRuleArgs;
if (args != null)
{
int max = args.MaxLength;
PropertyInfo p = target.GetType().GetProperty(e.PropertyName);
if (p != null)
{
if (p.PropertyType == typeof(string))
{
string value = (string)p.GetValue(target, null);
if (!String.IsNullOrEmpty(value) && (value.Length > max))
{
if (string.IsNullOrEmpty(e.Description))
{
e.Description = String.Format("{0} can not exceed {1} characters", e.FriendlyName, max.ToString());
}
return(false);
}
return(true);
}
else
{
throw new ArgumentException(string.Format("Property \"{0}\" is not of type String.", e.PropertyName));
}
}
else
{
throw new ArgumentException(string.Format("Property \"{0}\" not found on object \"{1}\"", e.PropertyName, target.GetType().ToString()));
}
}
else
{
throw new ArgumentException("Invalid ValidationRuleArgs. e must be of type MaxLengthRuleArgs.");
}
}
