jindeveloper

using System;
using System.Linq;
 
namespace CSharp_Attributes_Walkthrough.My_Custom_Attributes
{
    [Alias("Filipino_Customers", ConsoleColor.Yellow)]
    public class Customer
    {
        [Alias("Fname", ConsoleColor.White, AlternativeName = "Customer_FirstName")]
        public string Firstname { get; set; }

jindeveloper

using CSharp_Attributes_Walkthrough.My_Custom_Attributes;
using System;
 
namespace Implementing_Csharp_Attributes_101
{
    class Program
    {
        static void Main(string[] args)
        {
            var customer = new Customer { Firstname = "Jin Vincent" , LastName = "Necesario" };

jindeveloper

[Fact]
public void Test_GetAll_AttributeTargets()
{
    var targets = Enum.GetNames(typeof(AttributeTargets));
 
    foreach (var target in targets)
    {
        this._output.WriteLine($"AttributeTargets.{target}");
    }
 

jindeveloper

using CSharp_Attributes_Walkthrough.My_Custom_Attributes;
using System;
 
namespace CSharp_Attributes_Walkthrough.My_Custom_Attributes
{
    public class AliasAttribute : Attribute
    {
        //....
 
        //Added an optional-parameter

jindeveloper

using System;
 
namespace CSharp_Attributes_Walkthrough.My_Custom_Attributes
{
    public class AliasAttribute : Attribute
    {
        /// <summary>
        /// These parameters will become mandatory once have you decided to use this attribute.
        /// </summary>
        /// <param name="alias"></param>

jindeveloper

using System;
namespace CSharp_Attributes_Walkthrough.My_Custom_Attributes
{
 public class AliasAttribute : Attribute
 {
   //This is how to define a custom attributes.
 }
}

jindeveloper

using System;

namespace CSharp_Attributes_Walkthrough.My_Custom_Attributes
{
    /// <summary>
    /// This class is a custom attribute class. 
    /// Moreover, it is using the AttributeUsage attribute to annotate
    /// that this attribute is applicable only to class, struct and property.
    /// </summary>
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Property)]

jindeveloper

[Fact]
public void Test_Read_Attributes()
{
    //get the Product-class
    var type = typeof(Product);

    //Get the attributes of the Product-class and we are expecting the [Serializable]
    var attribute = (SerializableAttribute)type.
                    GetCustomAttributes(typeof(SerializableAttribute), false).FirstOrDefault();

jindeveloper

using System;
using System.Diagnostics;

namespace CSharp_Attributes_Walkthrough.My_Custom_Attributes
{
    [Serializable]
    public class Product
    {
        public string Name { get; set; }
        public string Code { get; set; }

jindeveloper

[Fact]
public void Test_GetAll_BuiltIn_Attributes()
{
    var assembly = Assembly.Load(assemblyFullName);

    var attributes = assembly
                        .DefinedTypes
                        .Where(type =>
                            type
                            .IsSubclassOf(typeof(Attribute)));