Hello everybody,

recently for me it was needed to find out all key fields of DAC class. Code below does this:

public List<string> GetKeyFieldsOfDAC(Type dacClass)
{
    var result = new List<string>();
    var properties = dacClass.GetProperties().ToList(); 
    
    foreach (PropertyInfo info in properties)
    {
        var attrs = info.GetCustomAttributes(true);
        foreach (object attr in attrs)
        {
            if (attr.HasProperty("IsKey"))
            {
                dynamic typedAttribute = attr;
                if (typedAttribute.IsKey)
                {
                    result.Add(info.Name);
                }
            }
        }
    }
 
    return result;
}

And HasProperty method implementation goes below:

public static bool HasProperty(this object objectToCheck, string property)
{
    try
    {
        var type = objectToCheck.GetType();
        var prop = type.GetProperty(property);
        if (prop != null)
        {
            return true;
        }
    }
    catch (AmbiguousMatchException) // it means we have more then one property
    {
        return true;
    }
 
    return false;
}

 That is not the most elegant solution in my life, and if you want to suggest a better one, please feel free to suggest.