atsvetkov

class Program
{
    static void Main(string[] args)
    {
        BenchmarkRunner.Run<GuardBenchmark>();
    }
}

[MemoryDiagnoser]
public class GuardBenchmark

atsvetkov

void Foo(SomeReferenceType input)
{
    Guard.NotNull(input, nameof(input));

    // do something useful
}

atsvetkov

public static void NotNull<T>(T value, string name) where T: class
{
    if (value == null)
    {
        throw new ArgumentNullException(name);
    }
}

atsvetkov

void Foo(SomeReferenceType input)
{
    Guard.NotNull(() => input);

    // do something useful
}

atsvetkov

public static class Guard
{
    public static void NotNull<T>(Expression<Func<T>> expression) where T : class
    {
        var value = /* somehow compile the expression and invoke the delegate to produce a value */;
        if (value == null)
        {
            throw new ArgumentNullException(GetParameterName(expression));
        }
    }

atsvetkov

void Foo(SomeReferenceType input)
{
    Guard.NotNull(input);

    // do something useful
}

atsvetkov

public static class Guard
{
    public static void NotNull(object value)
    {
        if (value == null)
        {
            throw new ArgumentNullException(/* how to get original argument name here??? */);
        }
    }
}

atsvetkov

void Foo(SomeReferenceType input)
{
    if (input == null)
    {
        throw new ArgumentNullException("input");
    }

    // if we made it here, input can be safely dereferenced and used
}

atsvetkov

Keybase proof

I hereby claim:

• I am atsvetkov on github.
• I am atsvetkov (https://keybase.io/atsvetkov) on keybase.
• I have a public key whose fingerprint is ED30 494E 8268 E48A F3CE 7394 F7FB 7DE3 7BC9 07AA

To claim this, I am signing this object:

atsvetkov

static void Main(string[] args)
{
    var connectionString = ConfigurationManager.ConnectionStrings["Database"].ConnectionString;
    
    // creates the database if not yet exists
    EnsureDatabase.For.SqlDatabase(connectionString);

    var upgrader = DeployChanges.To.SqlDatabase(connectionString)
        .WithScriptsEmbeddedInAssembly(Assembly.GetExecutingAssembly())
        .LogToConsole()