enisn

public interface IDataProvider<TData>
{
    TData GetData();
}

enisn

public void DoSomething(NotNull<string> message, NotNull<int> id, NotNull<Product> product)
{
  // ...
}

enisn

static void Main(string[] args)
{
  DoSomething("Hello World!"); // Works perfectly 👌
  
  DoSomething(null); // Throws ArgumentNullException at runtime.
  
  string parameter = null;
  DoSomething(parameter); // Throws ArgumentNullException at runtime.
}

enisn

public class NotNull<T>
{
    public NotNull(T value)
    {
        this.Value = value;
    }

    public T Value { get; set; }

    public static implicit operator NotNull<T>(T value)

enisn

public void DoSomething([NotNull]string message) // Does not affect anything at runtime.
{
}

public void AnotherMethod()
{
  DoSomething(null); // MsBuild doesn't allow to build.
  string parameter = null;
  DoSomething(parameter); // MsBuild allows build. But nothing happend at runtime.
}

enisn

public void DoSomething(string message)
{
  if(message == null)
    throw new ArgumentNullException();
    
    // ...
}

enisn

using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;

namespace SomeCompany.Extensions
{
    public static class BindingExtensions
    {
        public static string BindObjectProperties(this string str, object obj)

enisn

// This will work perfectly for nested objects.
var template = "Welcome back {Name}. You're logged in from {Profile.Address.Country.Code}. Have a good day.";

var user = new User { Name = "John", Address = new Address { Country = new Country { Code = "US" } } };

var message = template.BindObjectProperties(user);

Console.WriteLine(message);

enisn

public static string BindObjectProperties(this string str, object obj)
{
    if (obj == null) return str;
    foreach (var item in ExtractParams(str))
    {
        str = str.Replace("{" + item + "}", obj.GetPropValue(item)?.ToString());
    }
    return str;
}

enisn

// This will not work with nested object members.
var template = "Welcome back {Name}. You're logged in from {Profile.Address.Country.Code}. Have a good day.";

var user = new User { Name = "John", Email = "[email protected]" };

var message = template.BindObjectProperties(user);

Console.WriteLine(message);