#if NET20 || NET30

namespace System
{
    /// <summary>
    /// Encapsulates a method that has 3 parameters and does not return a value.
    /// </summary>
    /// <typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates.</typeparam>
    /// <typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates.</typeparam>
    /// <typeparam name="T3">The type of the third parameter of the method that this delegate encapsulates.</typeparam>
    /// <param name="arg1">The first parameter of the method that this delegate encapsulates.</param>
    /// <param name="arg2">The second parameter of the method that this delegate encapsulates.</param>
    /// <param name="arg3">The third parameter of the method that this delegate encapsulates.</param>
#if NETCF

    public delegate void Action<T1, T2, T3>(T1 arg1, T2 arg2, T3 arg3);

#else

    public delegate void Action<in T1, in T2, in T3>(T1 arg1, T2 arg2, T3 arg3);

#endif
}

#endif