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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,4 @@ | ||
| using System.Reflection; | ||
| using Difficulty; | ||
| using Difficulty; | ||
|
|
||
| public class Program | ||
| { | ||
|
|
||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
|
|
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| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net7.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
|
|
||
| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| public class Program | ||
| { | ||
| // signature: same return type & parameter | ||
| public delegate void MyDelegate(string text); | ||
| static void Main() | ||
| { | ||
| MyDelegate d = Print; | ||
|
|
||
| // two ways of calling or invoking delegate | ||
| d.Invoke("Hello world"); | ||
| d("Hello world"); | ||
|
|
||
| } | ||
| static void Print(string text) | ||
| { | ||
| Console.WriteLine(text); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| namespace GenericClass; | ||
| public class Car<T1, T2> | ||
| where T1 : class | ||
| where T2 : struct | ||
| { | ||
| private T1 _t1; | ||
| private T2 _t2; | ||
| public Car(T1 t1, T2 t2) | ||
| { | ||
| _t1 = t1; | ||
| _t2 = t2; | ||
| } | ||
| public T1 GetEngine() | ||
| { | ||
| return _t1; | ||
| } | ||
| public T2 GetTopSpeed() | ||
| { | ||
| return _t2; | ||
| } | ||
| public void SetEngine(T1 t1) | ||
| { | ||
| _t1 = t1; | ||
| } | ||
| public void SetTopSpeed(T2 t2) | ||
| { | ||
| _t2 = t2; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,7 @@ | ||
| namespace GenericClass; | ||
| public enum EngineEnum | ||
| { | ||
| Diesel = 1, | ||
| Electric, | ||
| Jet | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net7.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| using GenericClass; | ||
|
|
||
| public class Program | ||
| { | ||
| static void Main() | ||
| { | ||
| Car<Enum, int> car1 = new Car<Enum, int>(EngineEnum.Electric, 300); | ||
| Console.WriteLine(car1.GetEngine()); | ||
| car1.SetEngine(EngineEnum.Jet); | ||
| Console.WriteLine(car1.GetEngine()); | ||
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| Console.WriteLine(car1.GetTopSpeed()); | ||
| car1.SetTopSpeed(900); | ||
| Console.WriteLine(car1.GetTopSpeed()); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| namespace GenericCollection; | ||
|
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| public enum BrandEnum | ||
| { | ||
| Toyota = 1, | ||
| Honda, | ||
| Ferrari | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| namespace GenericCollection; | ||
| public class Car | ||
| { | ||
| private string? _brandName; | ||
| private int _topSpeed; | ||
| public string? BrandName | ||
| { | ||
| get => _brandName; | ||
| set => _brandName = value; | ||
| } | ||
| public int TopSpeed | ||
| { | ||
| get => _topSpeed; | ||
| set => _topSpeed = value; | ||
| } | ||
| public Car(string brandName, int topSpeed) | ||
| { | ||
| _brandName = brandName; | ||
| _topSpeed = topSpeed; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net7.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| using GenericCollection; | ||
|
|
||
| public class Program | ||
| { | ||
| static void Main() | ||
| { | ||
| List<int> list = new List<int> | ||
| { | ||
| 1, | ||
| 2, | ||
| 3, | ||
| 4 | ||
| }; | ||
|
|
||
| foreach (var l in list) | ||
| { | ||
| Console.WriteLine(l); | ||
| } | ||
|
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| List<Car> carList = new List<Car> | ||
| { | ||
| new Car("Honda", 300), | ||
| new Car("Toyota", 200), | ||
| new Car("Ferrari", 500) | ||
| }; | ||
| carList[0].TopSpeed = 200; | ||
| carList[1].BrandName = "Tayo"; | ||
|
|
||
| foreach (var c in carList) | ||
| { | ||
| Console.WriteLine($"{c.BrandName} has top speed of {c.TopSpeed} kmh."); | ||
| } | ||
|
|
||
| Dictionary<int, Car> dict = new Dictionary<int, Car> | ||
| { | ||
| { (int)BrandEnum.Honda, new Car(BrandEnum.Honda.ToString(), 300) }, | ||
| { (int)BrandEnum.Toyota, new Car(BrandEnum.Toyota.ToString(), 200) }, | ||
| { (int)BrandEnum.Ferrari, new Car(BrandEnum.Ferrari.ToString(), 500) }, | ||
| // { (int)BrandEnum.Ferrari, new Car(BrandEnum.Ferrari.ToString(), 500) } // Exception, An item with the same key has already been added. Key: 3 | ||
| }; | ||
|
|
||
| foreach (var d in dict) | ||
| { | ||
| Console.WriteLine($"{d.Value.BrandName} has top speed of {d.Value.TopSpeed} kmh."); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| namespace GenericConstraints; | ||
| public class Car : IEngine | ||
| { | ||
| private string? _carName; | ||
| public string? CarName | ||
| { | ||
| get => _carName; | ||
| set => _carName = value; | ||
| } | ||
|
|
||
| // Generic method | ||
| public void GetInfo<T>(T t) where T : class | ||
| { | ||
| Console.WriteLine("Info 1: " + t); | ||
| } | ||
| // Generic method | ||
| public void GetInfo<T1, T2>(T1 t1, T2 t2) | ||
| where T1 : class | ||
| where T2 : struct | ||
| { | ||
| Console.WriteLine("Info 1: " + t1); | ||
| Console.WriteLine("Info 2: " + t2); | ||
| } | ||
| public void RunEngine() | ||
| { | ||
| Console.WriteLine("Engine is running"); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
|
|
||
| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net7.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
|
|
||
| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| namespace GenericConstraints; | ||
| public interface IEngine | ||
| { | ||
| void RunEngine(); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| using GenericConstraints; | ||
|
|
||
| public static class Program | ||
| { | ||
| static void Main() | ||
| { | ||
| Car car = new(); | ||
| car.CarName = "Toyota"; | ||
| car.GetInfo(car.CarName); | ||
| car.GetInfo("Honda", 200); | ||
| // car.GetInfo(200, "Honda"); // <- error, first param should be class & second param should be struct | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
|
|
||
| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>net7.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
|
|
||
| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| using System.Collections; | ||
|
|
||
| public class Program | ||
| { | ||
| static void Main() | ||
| { | ||
| // ArrayList accepts all objects, it is not safety collection. | ||
| ArrayList arrList = new ArrayList(); | ||
| arrList.Add(new Class1()); | ||
| arrList.Add(3); | ||
| arrList.Add("abcdef"); | ||
| ((Class1)arrList[0]).Method1(); | ||
| // ((Class1)arrList[1]).Method1(); // Unable to cast object of type 'System.Int32' to type 'Class1'. | ||
| } | ||
| } | ||
|
|
||
| public class Class1 | ||
| { | ||
| public void Method1() | ||
| { | ||
| Console.WriteLine("Hi"); | ||
| } | ||
| } |