MatchExtensions.cs

using System;

public static class MatchExtensions
{
    /// <summary>
    /// Performs the first action with a matching type.
    /// </summary>
    /// <param name="value">The value to cast.</param>
    /// <param name="match1">The action to perform if the value is TMatch1.</param>
    public static void Match<T, TMatch1>(this T value, Action<TMatch1> match1)
        where TMatch1 : T
    {
        if (value is TMatch1)
            match1.Invoke((TMatch1)value);
    }

    /// <summary>
    /// Performs the first action with a matching type.
    /// </summary>
    /// <param name="value">The value to cast.</param>
    /// <param name="match1">The action to perform if the value is TMatch1.</param>
    /// <param name="match2">The action to perform if the value is TMatch2 and no prior match was found.</param>
    public static void Match<T, TMatch1, TMatch2>(this T value, Action<TMatch1> match1, Action<TMatch2> match2)
        where TMatch1 : T
        where TMatch2 : T
    {
        if (value is TMatch1)
            match1.Invoke((TMatch1)value);
        else if (value is TMatch2)
            match2.Invoke((TMatch2)value);
    }

    /// <summary>
    /// Performs the first action with a matching type.
    /// </summary>
    /// <param name="value">The value to cast.</param>
    /// <param name="match1">The action to perform if the value is TMatch1.</param>
    /// <param name="match2">The action to perform if the value is TMatch2 and no prior match was found.</param>
    /// <param name="match3">The action to perform if the value is TMatch3 and no prior match was found.</param>
    public static void Match<T, TMatch1, TMatch2, TMatch3>(this T value, Action<TMatch1> match1, Action<TMatch2> match2, Action<TMatch3> match3)
        where TMatch1 : T
        where TMatch2 : T
        where TMatch3 : T
    {
        if (value is TMatch1)
            match1.Invoke((TMatch1)value);
        else if (value is TMatch2)
            match2.Invoke((TMatch2)value);
        else if (value is TMatch3)
            match3.Invoke((TMatch3)value);
    }

    /// <summary>
    /// Performs the first action with a matching type.
    /// </summary>
    /// <param name="value">The value to cast.</param>
    /// <param name="match1">The action to perform if the value is TMatch1.</param>
    /// <param name="match2">The action to perform if the value is TMatch2 and no prior match was found.</param>
    /// <param name="match3">The action to perform if the value is TMatch3 and no prior match was found.</param>
    /// <param name="match4">The action to perform if the value is TMatch4 and no prior match was found.</param>
    public static void Match<T, TMatch1, TMatch2, TMatch3, TMatch4>(this T value, Action<TMatch1> match1, Action<TMatch2> match2, Action<TMatch3> match3, Action<TMatch4> match4)
        where TMatch1 : T
        where TMatch2 : T
        where TMatch3 : T
        where TMatch4 : T
    {
        if (value is TMatch1)
            match1.Invoke((TMatch1)value);
        else if (value is TMatch2)
            match2.Invoke((TMatch2)value);
        else if (value is TMatch3)
            match3.Invoke((TMatch3)value);
        else if (value is TMatch4)
            match4.Invoke((TMatch4)value);
    }

    /// <summary>
    /// Performs the first action with a matching type.
    /// </summary>
    /// <param name="value">The value to cast.</param>
    /// <param name="match1">The action to perform if the value is TMatch1.</param>
    /// <param name="match2">The action to perform if the value is TMatch2 and no prior match was found.</param>
    /// <param name="match3">The action to perform if the value is TMatch3 and no prior match was found.</param>
    /// <param name="match4">The action to perform if the value is TMatch4 and no prior match was found.</param>
    /// <param name="match5">The action to perform if the value is TMatch5 and no prior match was found.</param>
    public static void Match<T, TMatch1, TMatch2, TMatch3, TMatch4, TMatch5>(this T value, Action<TMatch1> match1, Action<TMatch2> match2, Action<TMatch3> match3, Action<TMatch4> match4, Action<TMatch5> match5)
        where TMatch1 : T
        where TMatch2 : T
        where TMatch3 : T
        where TMatch4 : T
        where TMatch5 : T
    {
        if (value is TMatch1)
            match1.Invoke((TMatch1)value);
        else if (value is TMatch2)
            match2.Invoke((TMatch2)value);
        else if (value is TMatch3)
            match3.Invoke((TMatch3)value);
        else if (value is TMatch4)
            match4.Invoke((TMatch4)value);
        else if (value is TMatch5)
            match5.Invoke((TMatch5)value);
    }

    /// <summary>
    /// Performs the first action with a matching type.
    /// </summary>
    /// <param name="value">The value to cast.</param>
    /// <param name="match1">The action to perform if the value is TMatch1.</param>
    /// <param name="match2">The action to perform if the value is TMatch2 and no prior match was found.</param>
    /// <param name="match3">The action to perform if the value is TMatch3 and no prior match was found.</param>
    /// <param name="match4">The action to perform if the value is TMatch4 and no prior match was found.</param>
    /// <param name="match5">The action to perform if the value is TMatch5 and no prior match was found.</param>
    /// <param name="match6">The action to perform if the value is TMatch6 and no prior match was found.</param>
    public static void Match<T, TMatch1, TMatch2, TMatch3, TMatch4, TMatch5, TMatch6>(this T value, Action<TMatch1> match1, Action<TMatch2> match2, Action<TMatch3> match3, Action<TMatch4> match4, Action<TMatch5> match5, Action<TMatch6> match6)
        where TMatch1 : T
        where TMatch2 : T
        where TMatch3 : T
        where TMatch4 : T
        where TMatch5 : T
        where TMatch6 : T
    {
        if (value is TMatch1)
            match1.Invoke((TMatch1)value);
        else if (value is TMatch2)
            match2.Invoke((TMatch2)value);
        else if (value is TMatch3)
            match3.Invoke((TMatch3)value);
        else if (value is TMatch4)
            match4.Invoke((TMatch4)value);
        else if (value is TMatch5)
            match5.Invoke((TMatch5)value);
        else if (value is TMatch6)
            match6.Invoke((TMatch6)value);
    }

    /// <summary>
    /// Performs the first action with a matching type.
    /// </summary>
    /// <param name="value">The value to cast.</param>
    /// <param name="match1">The action to perform if the value is TMatch1.</param>
    /// <param name="match2">The action to perform if the value is TMatch2 and no prior match was found.</param>
    /// <param name="match3">The action to perform if the value is TMatch3 and no prior match was found.</param>
    /// <param name="match4">The action to perform if the value is TMatch4 and no prior match was found.</param>
    /// <param name="match5">The action to perform if the value is TMatch5 and no prior match was found.</param>
    /// <param name="match6">The action to perform if the value is TMatch6 and no prior match was found.</param>
    /// <param name="match7">The action to perform if the value is TMatch7 and no prior match was found.</param>
    public static void Match<T, TMatch1, TMatch2, TMatch3, TMatch4, TMatch5, TMatch6, TMatch7>(this T value, Action<TMatch1> match1, Action<TMatch2> match2, Action<TMatch3> match3, Action<TMatch4> match4, Action<TMatch5> match5, Action<TMatch6> match6, Action<TMatch7> match7)
        where TMatch1 : T
        where TMatch2 : T
        where TMatch3 : T
        where TMatch4 : T
        where TMatch5 : T
        where TMatch6 : T
        where TMatch7 : T
    {
        if (value is TMatch1)
            match1.Invoke((TMatch1)value);
        else if (value is TMatch2)
            match2.Invoke((TMatch2)value);
        else if (value is TMatch3)
            match3.Invoke((TMatch3)value);
        else if (value is TMatch4)
            match4.Invoke((TMatch4)value);
        else if (value is TMatch5)
            match5.Invoke((TMatch5)value);
        else if (value is TMatch6)
            match6.Invoke((TMatch6)value);
        else if (value is TMatch7)
            match7.Invoke((TMatch7)value);
    }

    /// <summary>
    /// Performs the first action with a matching type.
    /// </summary>
    /// <param name="value">The value to cast.</param>
    /// <param name="match1">The action to perform if the value is TMatch1.</param>
    /// <param name="match2">The action to perform if the value is TMatch2 and no prior match was found.</param>
    /// <param name="match3">The action to perform if the value is TMatch3 and no prior match was found.</param>
    /// <param name="match4">The action to perform if the value is TMatch4 and no prior match was found.</param>
    /// <param name="match5">The action to perform if the value is TMatch5 and no prior match was found.</param>
    /// <param name="match6">The action to perform if the value is TMatch6 and no prior match was found.</param>
    /// <param name="match7">The action to perform if the value is TMatch7 and no prior match was found.</param>
    /// <param name="match8">The action to perform if the value is TMatch8 and no prior match was found.</param>
    public static void Match<T, TMatch1, TMatch2, TMatch3, TMatch4, TMatch5, TMatch6, TMatch7, TMatch8>(this T value, Action<TMatch1> match1, Action<TMatch2> match2, Action<TMatch3> match3, Action<TMatch4> match4, Action<TMatch5> match5, Action<TMatch6> match6, Action<TMatch7> match7, Action<TMatch8> match8)
        where TMatch1 : T
        where TMatch2 : T
        where TMatch3 : T
        where TMatch4 : T
        where TMatch5 : T
        where TMatch6 : T
        where TMatch7 : T
        where TMatch8 : T
    {
        if (value is TMatch1)
            match1.Invoke((TMatch1)value);
        else if (value is TMatch2)
            match2.Invoke((TMatch2)value);
        else if (value is TMatch3)
            match3.Invoke((TMatch3)value);
        else if (value is TMatch4)
            match4.Invoke((TMatch4)value);
        else if (value is TMatch5)
            match5.Invoke((TMatch5)value);
        else if (value is TMatch6)
            match6.Invoke((TMatch6)value);
        else if (value is TMatch7)
            match7.Invoke((TMatch7)value);
        else if (value is TMatch8)
            match8.Invoke((TMatch8)value);
    }
}