HandyControl/Net40/HandyControl_Net40/Interactivity/DefaultTriggerAttribute.cs

using System;
using System.Collections;
using System.Globalization;

namespace HandyControl.Interactivity
{
    [AttributeUsage(AttributeTargets.Property | AttributeTargets.Class, AllowMultiple = true)]
    public sealed class DefaultTriggerAttribute : Attribute
    {
        private readonly object[] _parameters;

        public DefaultTriggerAttribute(Type targetType, Type triggerType, object parameter) : this(targetType,
            triggerType, new[] {parameter})
        {
        }

        public DefaultTriggerAttribute(Type targetType, Type triggerType, params object[] parameters)
        {
            if (!typeof(TriggerBase).IsAssignableFrom(triggerType))
                throw new ArgumentException(string.Format(CultureInfo.CurrentCulture,
                    ExceptionStringTable.DefaultTriggerAttributeInvalidTriggerTypeSpecifiedExceptionMessage,
                    new object[] {triggerType.Name}));
            TargetType = targetType;
            TriggerType = triggerType;
            _parameters = parameters;
        }

        public IEnumerable Parameters =>
            _parameters;

        public Type TargetType { get; }

        public Type TriggerType { get; }

        public TriggerBase Instantiate()
        {
            object obj2 = null;
            try
            {
                obj2 = Activator.CreateInstance(TriggerType, _parameters);
            }
            catch
            {
                // ignored
            }
            return (TriggerBase) obj2;
        }
    }
}