Use reflection to get attribute of a property via method called from the setter

Question

Note: This is a follow-up to an answer on a previous question.

I\'m decorating a property\'s setter with an Attribute called TestMaxStringLength

Answer 1

You could consider, as an alternative approach, delaying validation until later, thus removing the need to inspect the stack trace.

This example provides an attribute...

public class MaxStringLengthAttribute : Attribute
{
    public int MaxLength { get; set; }
    public MaxStringLengthAttribute(int length) { this.MaxLength = length; }
}

... a POCO with the attribute applied to a property...

public class MyObject
{
    [MaxStringLength(50)]
    public string CompanyName { get; set; }
}

... and a utility class stub that validates the object.

public class PocoValidator
{
    public static bool ValidateProperties(TValue value)
    {
        var type = typeof(TValue);
        var props = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
        foreach (var prop in props)
        {
            var atts = prop.GetCustomAttributes(typeof(MaxStringLengthAttribute), true);
            var propvalue = prop.GetValue(value, null);

            // With the atts in hand, validate the propvalue ...
            // Return false if validation fails.
        }

        return true;
    }
}