This example shows
-reading attributes
-initialize object in dependence of attributes value
-reading attributes from class and from properties
-early binding / late binding examples
-iteration through types
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using CarLib; using Numbers; using System.Reflection; namespace AttrPracticeMain { class Program { static void Main(string[] args) { ReflectOnAttributesUsingEarlyBinding(); // early binding EvenNumbersWithIteration(); // late binding NotEvenNumbers(); // late binding EvenNumbers(); // late binding EvenNotEvenOrBoth(); // late binding EvenOddOrBothToProps(); //late binding Console.ReadLine(); } static void EvenNumbersWithIteration() { // get types Assembly asm = Assembly.LoadFile("C:\\C#\\MyC#StudyProjects\\08_Attributes\\Practice\\AttrPracticeMain\\AttrPracticeMain\\bin\\Debug\\Numbers.dll"); Type TCustomAttribute = asm.GetType("Numbers.CustomAttribute"); PropertyInfo PropertyDescription = TCustomAttribute.GetProperty("Description"); Type[] types = asm.GetTypes(); //iterate through types foreach (Type t in types) { object[] objs = t.GetCustomAttributes(TCustomAttribute, false); foreach (object o in objs) { if ((t.Name == "EvenNumbers") && (PropertyDescription.GetValue(o, null).ToString() == "EvenNumbersClass")) { // Console.WriteLine("Catched"); //Create instance and fill array with Evens object EvenNumbersObject = Activator.CreateInstance(t); (EvenNumbersObject as EvenNumbers).Content = new int[] { 2, 4, 6 }; Console.WriteLine("Success even numbers with iteration"); } } } } static void EvenNumbers() { Assembly asm = Assembly.LoadFile("C:\\C#\\MyC#StudyProjects\\08_Attributes\\Practice\\AttrPracticeMain\\AttrPracticeMain\\bin\\Debug\\Numbers.dll"); Type TCustomAttribute = asm.GetType("Numbers.CustomAttribute"); Type TEvenNumbers=asm.GetType("Numbers.EvenNumbers"); PropertyInfo PropertyDescription = TCustomAttribute.GetProperty("Description"); var myCustomAttribute= TEvenNumbers.GetCustomAttribute(TCustomAttribute); if (PropertyDescription.GetValue(myCustomAttribute, null).ToString() == "EvenNumbersClass") { // create instance and fill array object EvenNumbersObject = Activator.CreateInstance(TEvenNumbers); (EvenNumbersObject as EvenNumbers).Content = new int[] { 2, 4, 6 }; Console.WriteLine("Success with Even Numbers"); } } static void NotEvenNumbers() { Assembly asm = Assembly.LoadFile("C:\\C#\\MyC#StudyProjects\\08_Attributes\\Practice\\AttrPracticeMain\\AttrPracticeMain\\bin\\Debug\\Numbers.dll"); Type TCustomAttribute = asm.GetType("Numbers.CustomAttribute"); Type TNotEvenNumbers = asm.GetType("Numbers.NotEvenNumbers"); PropertyInfo pi = TCustomAttribute.GetProperty("Description"); var myCustomAttribute = TNotEvenNumbers.GetCustomAttribute(TCustomAttribute); if (pi.GetValue(myCustomAttribute, null).ToString() == "NotEvenNumbersClass") { // create instance and fill array object EvenNumbersObject = Activator.CreateInstance(TNotEvenNumbers); (EvenNumbersObject as NotEvenNumbers).Content = new int[] { 1, 3, 5 }; Console.WriteLine("Success with non Even Numbers"); } } static void EvenNotEvenOrBoth() { Assembly asm = Assembly.LoadFile("C:\\C#\\MyC#StudyProjects\\08_Attributes\\Practice\\AttrPracticeMain\\AttrPracticeMain\\bin\\Debug\\Numbers.dll"); Type TCustomAttribute = asm.GetType("Numbers.CustomAttribute"); Type TAllNumbers = asm.GetType("Numbers.AllNumbers"); PropertyInfo pi = TCustomAttribute.GetProperty("Description"); var myCustomAttribute = TAllNumbers.GetCustomAttribute(TCustomAttribute); if (pi.GetValue(myCustomAttribute, null).ToString() == "EvenNumbers") { // create instance and fill array object EvenNumbersObject = Activator.CreateInstance(TAllNumbers); (EvenNumbersObject as AllNumbers).Content = new int[] { 2, 4, 6 }; } else if (pi.GetValue(myCustomAttribute, null).ToString() == "NotEvenNumbers") { // create instance and fill array object EvenNumbersObject = Activator.CreateInstance(TAllNumbers); (EvenNumbersObject as AllNumbers).Content = new int[] { 1, 3, 5 }; } else if (pi.GetValue(myCustomAttribute, null).ToString() == "EvenAndUnEvenNumbers") { // create instance and fill array object NumbersObject = Activator.CreateInstance(TAllNumbers); (NumbersObject as AllNumbers).Content = new int[] { 1, 2, 3, 4, 5, 6 }; } Console. WriteLine("Success with non Even Numbers. Current option is "+ (pi.GetValue(myCustomAttribute, null).ToString())); } // read attributes early binding private static void ReflectOnAttributesUsingEarlyBinding() { Type t = typeof(SportsCar); // Knowing type SportsCar, so early binding object[] customAtts = t.GetCustomAttributes(false); foreach (Object o in customAtts) { if (o is CustomAttributeDescription) Console.WriteLine("->{0}\n", (o as CustomAttributeDescription).Description); } } //--------------- static void EvenOddOrBothToProps() { // load and define types Assembly asm = Assembly.LoadFile("C:\\C#\\MyC#StudyProjects\\08_Attributes\\Practice\\AttrPracticeMain\\AttrPracticeMain\\bin\\Debug\\Numbers.dll"); Type TCustomAttribute = asm.GetType("Numbers.CustomAttribute"); Type TAllNumbers = asm.GetType("Numbers.AllNumbers"); PropertyInfo pi = TCustomAttribute.GetProperty("Description"); var myCustomAttribute = TAllNumbers.GetCustomAttribute(TCustomAttribute); //creating instance object EvenNumbersObject = Activator.CreateInstance(TAllNumbers); // reading props and filling arrays PropertyInfo[] piArray = TAllNumbers.GetProperties(); foreach (PropertyInfo p in piArray) { var propAttr = p.GetCustomAttribute(TCustomAttribute); //if (propAttr!=null) continue; if ((propAttr != null)&&(pi.GetValue(propAttr, null).ToString() == "Even")) { (EvenNumbersObject as AllNumbers).IntArray = new int[] { 2, 4, 6 }; } if ((propAttr != null)&&(pi.GetValue(propAttr, null).ToString() == "Odd")) { // create instance and fill with evens (EvenNumbersObject as AllNumbers).AnotherIntArray = new int[] { 1, 3, 5 }; } } //check foreach (int i in (EvenNumbersObject as AllNumbers).IntArray) Console.WriteLine(i); Console.WriteLine(" "); foreach (int i in (EvenNumbersObject as AllNumbers).AnotherIntArray) Console.WriteLine(i); } } } |
Numbers
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace Numbers { // defining Custom Attribute class public sealed class CustomAttribute : System.Attribute { public string Description { get; set; } public CustomAttribute(string ADescription) { Description = ADescription; } public CustomAttribute() { } } public abstract class Numbers { public int[] Content { get; set; } } [CustomAttribute("EvenNumbersClass")] public class EvenNumbers:Numbers { } [CustomAttribute("NotEvenNumbersClass")] public class NotEvenNumbers:Numbers { } [CustomAttribute("EvenNumbers")] public class AllNumbers : Numbers { } } |
CarLib
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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace CarLib { // defining Custom Attribute class public sealed class CustomAttributeDescription : System.Attribute { public string Description { get; set; } public CustomAttributeDescription(string ADescription) { Description = ADescription; } public CustomAttributeDescription() { } } [Serializable, CustomAttributeDescription("BaseClass")] public abstract class Car { public int MaxSpeed { get; set; } public abstract void TurboBoost(); } [Serializable, CustomAttributeDescription("It is attribute description.There is Descendent of Car")] public class SportsCar : Car { public SportsCar() { MaxSpeed = 160; } public override void TurboBoost() { Console.WriteLine(MaxSpeed+" km/h"); } } } |