Exceptions and Defensive Coding

Finally Clause

A finally block runs after the try/catch path finishes.

Finally Clause

FinallyClause.cs 
using System;

class Program
{
    static void Main()
    {
        string mode = ;
        bool closed = false;
        string status = "started";

        try
        {
            if (mode == "fail")
            {
                throw new InvalidOperationException("demo");
            }

            status = "finished";
        }
        catch (InvalidOperationException)
        {
            status = "handled";
        }
        finally
        {
            closed = true;
        }

        Console.WriteLine($"mode={mode}");
        Console.WriteLine($"status={status}");
        Console.WriteLine($"closed={closed}");
    }
}

using System;

class Program
{
    static void Main()
    {
        string mode = ;
        bool closed = false;
        string status = "started";

        try
        {
            if (mode == "fail")
            {
                throw new InvalidOperationException("demo");
            }

            status = "finished";
        }
        catch (InvalidOperationException)
        {
            status = "handled";
        }
        finally
        {
            closed = true;
        }

        Console.WriteLine($"mode={mode}");
        Console.WriteLine($"status={status}");
        Console.WriteLine($"closed={closed}");
    }
}

using System;

class Program
{
    static void Main()
    {
        string mode = ;
        bool closed = false;
        string status = "started";

        try
        {
            if (mode == "fail")
            {
                throw new InvalidOperationException("demo");
            }

            status = "finished";
        }
        catch (InvalidOperationException)
        {
            status = "handled";
        }
        finally
        {
            closed = true;
        }

        Console.WriteLine($"mode={mode}");
        Console.WriteLine($"status={status}");
        Console.WriteLine($"closed={closed}");
    }
}
finally A `finally` block runs for both successful and handled failing paths.