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Microsoft .NET

Microsoft .NET. Вторая лекция. Reference and value types. public class RefType { } public struct ValueType : IDisposable { public int A, B; public ValueType( int a, int b) { A = a; B = b; } public void Dispose() { /* Do some work */ } }. Встроенные типы.

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Microsoft .NET

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  1. Microsoft .NET Вторая лекция

  2. Reference and value types public class RefType { } public struct ValueType : IDisposable { public int A, B; public ValueType(int a, int b) { A = a; B = b; } public void Dispose() { /* Do some work */ } }

  3. Встроенные типы Value types: bool b; int i; byte by; uint ui; sbyte sby;long l; char c;ulong ul; decimal dec;short s; double d;ushort us; float f; Reference types: object o;string str;

  4. Enums public enum MyEnum { MyValue1, MyValue2, MyValue3} //... MyEnum val = MyEnum.MyValue1; //... switch(val) { case MyEnum.MyValue1: //... break; case MyEnum.MyValue2: //... break; }

  5. Массивы int[]arr = new int[4]; int[]arr2 = new int[]{1, 2, 3 }; int[,]arr_2d = new int[,] { {1, 3}, {5, 7} }; int[][]arr_jagged = new int[3][]; for (int i = 0; i < arr_jagged.Length; ++i) arr_jagged[i] = new int[i + 10];

  6. Методы с переменным количеством параметров public static int Max(params int[]numbers) { if (numbers.Length < 1) throw new ArgumentException(); int cur_max = numbers[0]; foreach (int number in numbers) cur_max = Math.Max(cur_max, number); return cur_max; } // ... int i = Max(3, 5, 4, 234); int[]arr = new int[] { 2, 3, 6, 3, 98 }; i = Max(arr);

  7. Перегрузка операторов public struct Complex { public double Re, Im; public Complex(double re, double im) { Re = re; Im = im; } public Complex(double re) : this(re, 0) { } public static Complex operator + (Complex l, Complex r) { return new Complex(l.Re + r.Re, l.Im + r.Im); } public static implicit operator Complex(double re) { return new Complex(re); } }

  8. Использованиеперегруженных операторов static void Main(string[]args) { Complex z1 = 0; Complex z2 = z1 + z1.Re ; }

  9. Generics public class Wrapper<T> { private readonly T _val; public Wrapper(T val) { _val = val; } public static implicit operator T(Wrapper<T> wrapper) { return wrapper._val;} public static implicit operator Wrapper<T> (T val) { return new Wrapper<T>(val); } }

  10. Generics public T Max<T>(params T[] values) where T : IComparable<T> { if (values.Length < 1) throw new ArgumentException(); T cur_max = values[0]; foreach (T val in values) if (cur_max.CompareTo(val) < 0) cur_max = val; return cur_max; }

  11. Оператор foreach static void Main(string[]args) { foreach (string s in args) Console.WriteLine(s); }

  12. IEnumerable interface interface IEnumerable { IEnumerator GetEnumerator(); } interface IEnumerator { public bool MoveNext(); public void Reset(); public object Current { get; } }

  13. Delegates public class GDIContext {/* ... */ } public class Window { public delegate void OnPaintProc(GDIContext gdi); public OnPaintProc OnPaint; // ... } private static void DrawCircle(GDIContext gdi) { /* ... */ } static void Main(string[]args) { Window wnd = new Window(); wnd.OnPaint += DrawCircle; }

  14. Exceptions try { throw new Exception("Hello, world!!!"); } catch(Exception ex) { Console.WriteLine(ex.Message); } finally { Console.WriteLine("Finally block executed."); }

  15. IDisposable interface public class Device : IDisposable { public Device() { /* ... */ } public void Dispose() { GC.SuppressFinalize(this); /* ... */ } ~Device() { Dispose(); } }

  16. Оператор using using (Device dev = new Device()) { // ... throw new Exception("Hello, world!!!"); }

  17. Reflection • Assemblies • MyClassLibrary.dll • MyExecutable.exe • Types • MyClassLibrary.SomeNamespace.MyClass • MyClassLibrary.SomeNamespace.MyClass.Nested • Methods, Properties, etc • MyClassLibrary.SomeNamespace.MyClass.DoWork() • MyClassLibrary.SomeNamespace.MyClass.SomeValue

  18. Reflection static void PrintMethods(Type type) { foreach(MethodInfo method in type.GetMethods()) { Console.WriteLine(method); } } static void Main(string[]args) { PrintMethods(typeof(int)); }

  19. Attributes class EnumValueAttribute : Attribute { private readonly string _valueName; public EnumValueAttribute(string valueName) { _valueName = valueName; } public string ValueName { get { return _valueName; } } }

  20. Attributes public enum WindowMessage { [EnumValue("Изменение размеров")]Resize, [EnumValue("Перерисовка")]Paint, [EnumValue("Нажатие кнопки")]KeyDown } [Serializable] public class MyClass { [NonSerialized] protected int i; public double D; }

  21. Reflection.Emit Возможность создавать во время выполнения новые • Сборки • Типы • Методы • и т.д. А также добавлять новые сущности к уже существующим

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