Category Archives: C#

C#. Shared assembly

Posted on 30.08.2017 by Stanislav_Panteleev

Lets use Carlib.dll from One file Assembly 1. Strong name Properties – > Signing – > Sign the assembly -> New – > SomeName (for ex. myKeyPair.snk) 2. Install assembly to GAC (Global Assembly Cache) go to C:\ProgramData\Microsoft\Windows\Start Menu\Programs\Visual Studio … Continue reading →

Posted in C# | Comments Off

С#. Assembly theory

Posted on 29.08.2017 by Stanislav_Panteleev

Assembly – versioned (for ex. 1.0.0.0), self described( has manifest, links to other external assemblies, info about all types) binary, supported by CLR (Common Language Runtime). One EXE is divided in may exe, dll files. Assembly defines type borders. Example. … Continue reading →

Posted in C# | Comments Off

C#. Creating one file assembly. Example

Posted on 29.08.2017 by Stanislav_Panteleev

Lets create CarLibrary.dll assembly File NewProject ClassLibrary

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CarLibrary
{
    public enum EngineState {EngineAlive, engineDead}

    public abstract class Car
    {
        public string PetName { get; set; }
        public int CurrentSpeed { get; set; }
        public int MaxSpeed { get; set; }
        protected EngineState egnState = EngineState.EngineAlive;
        public EngineState EngineState {get { return egnState; }}
        public abstract void TurboBoost();
        public Car(){}
        public Car(string name, int maxSp, int currSp) {
            PetName = name; MaxSpeed = maxSp; CurrentSpeed = currSp;
        }
    }


}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace CarLibrary

{

public enum EngineState {EngineAlive, engineDead}

public abstract class Car

{

public string PetName { get; set; }

public int CurrentSpeed { get; set; }

public int MaxSpeed { get; set; }

protected EngineState egnState = EngineState.EngineAlive;

public EngineState EngineState {get { return egnState; }}

public abstract void TurboBoost();

public Car(){}

public Car(string name, int maxSp, int currSp) {

PetName = name; MaxSpeed = maxSp; CurrentSpeed = currSp;

}

In other file Derived.cs 2 derived classes ClassView – addReference – System.Windows.Forms

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using CarLibrary;
using System.Windows.Forms;

namespace CarLibrary
{
    public class SportsCar : Car
    {
                                  
        public SportsCar() { }
        public SportsCar(string name, int maxSp, int currSp) : base(name, maxSp, currSp) { }
        public override void TurboBoost() { MessageBox.Show("Turbo Boost Sports Car"); }
   
}

    public class MiniVan : Car
    {

        public MiniVan() { }
        public MiniVan(string name, int maxSp, int currSp) : base(name, maxSp, currSp) { }
        public override void TurboBoost() { MessageBox.Show("Turbo Boost MiniVan"); }

    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using CarLibrary;

using System.Windows.Forms;

namespace CarLibrary

{

public class SportsCar : Car

{

public SportsCar() { }

public SportsCar(string name, int maxSp, int currSp) : base(name, maxSp, currSp) { }

public override void TurboBoost() { MessageBox.Show("Turbo Boost Sports Car"); }

}

public class MiniVan : Car

{

public MiniVan() { }

public MiniVan(string name, int maxSp, int currSp) : base(name, maxSp, currSp) { }

public override void TurboBoost() { MessageBox.Show("Turbo Boost MiniVan"); }

}

Now lets create new project CarClient ClassView – addReference – Browse – CarLibrary.dll

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using CarLibrary;

namespace CarClient
{
    class Program
    {
        static void Main(string[] args)
        {
            SportsCar viper = new SportsCar("Viper",240,40);
            viper.TurboBoost();

            MiniVan mv = new MiniVan();
            mv.TurboBoost();
            Console.ReadLine();

        }

    }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using CarLibrary;

namespace CarClient

{

class Program

{

static void Main(string[] args)

{

SportsCar viper = new SportsCar("Viper",240,40);

viper.TurboBoost();

MiniVan mv = new MiniVan();

mv.TurboBoost();

Console.ReadLine();

}

Posted in C# | Comments Off

C#. Namespace examples

Posted on 28.08.2017 by Stanislav_Panteleev

123

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MyShapes;
using The3DHexagon=My3DShapes.Hexagon; // alias for class with same name

namespace CustomNameSpace
{
    class Program
    {
        static void Main(string[] args)
        {
            // one way
            Hexagon h = new Hexagon();
            Circle c = new Circle();
            Square s = new Square();

            //another, no need to write using MyShapes
            MyShapes.Hexagon h1 = new Hexagon();
            MyShapes.Circle c1 = new Circle();
            MyShapes.Square s1 = new Square();

            //
            The3DHexagon h2 = new The3DHexagon();
        }
    }

    namespace someEmbedded {

        public class SomeClass {
            Hexagon h = new Hexagon();
        }
    }    

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using MyShapes;

using The3DHexagon=My3DShapes.Hexagon; // alias for class with same name

namespace CustomNameSpace

{

class Program

{

static void Main(string[] args)

{

// one way

Hexagon h = new Hexagon();

Circle c = new Circle();

Square s = new Square();

//another, no need to write using MyShapes

MyShapes.Hexagon h1 = new Hexagon();

MyShapes.Circle c1 = new Circle();

MyShapes.Square s1 = new Square();

The3DHexagon h2 = new The3DHexagon();

}

namespace someEmbedded {

public class SomeClass {

Hexagon h = new Hexagon();

}

Circle.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MyShapes
{
    class Circle
    {
    }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace MyShapes

{

class Circle

{

}

Hexagon.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MyShapes
{
    class Hexagon
    {
    }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace MyShapes

{

class Hexagon

{

}

Square.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MyShapes
{
    class Square
    {
    }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace MyShapes

{

class Square

{

}

Posted in C# | Comments Off

C#. Delegates, Func, Action

Posted on 27.08.2017 by Stanislav_Panteleev

Ну, есть ключевое слово delegate — это описание сигнатуры функции, т. е., её списка параметров и типа возвращаемого значения. Используется так:

public delegate bool MyPredicate(int x);

1	public delegate bool MyPredicate(int x);

Им можно пользоваться так:

private bool IsOdd(int i) { return i % 2 != 0; }

private Analyze(MyPredicate p, int x)
{
    bool result = p(x);
    if (result)
        Console.WriteLine("found!");
}

Analyze(IsOdd, 1); // печатает "found!"

private bool IsOdd(int i) { return i % 2 != 0; }

private Analyze(MyPredicate p, int x)

{

bool result = p(x);

if (result)

Console.WriteLine("found!");

}

Analyze(IsOdd, 1); // печатает "found!"

С другой стороны, есть готовые, предопределённые сигнатуры функций (Func<TArg1, TArg2, …, TResult> с возвращаемым … Continue reading →

Posted in C# | Comments Off

C#. Func template for delegates

Posted on 27.08.2017 by Stanislav_Panteleev

123

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FuncExample
{
    // what is Func - is prepared delegate - no need to define own delegate

    class Program
    {
        static void Main(string[] args)
        {
            Calc c = new Calc();
            Console.WriteLine(c.Execute(Add,1,2));
            Console.ReadLine();
        }


        public static double Add(int a1, int a2) { return a1 + a2; }
    }

    class Calc {
        
        public double Execute(Func<int,int, double> function, int arg1, int arg2) {
               return function(arg1,arg2);            
        }

        
    }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace FuncExample

{

// what is Func - is prepared delegate - no need to define own delegate

class Program

{

static void Main(string[] args)

{

Calc c = new Calc();

Console.WriteLine(c.Execute(Add,1,2));

Console.ReadLine();

}

public static double Add(int a1, int a2) { return a1 + a2; }

}

class Calc {

public double Execute(Func<int,int, double> function, int arg1, int arg2) {

return function(arg1,arg2);

}

Posted in C# | Comments Off

C#. Syntax simple examples

Posted on 27.08.2017 by Stanislav_Panteleev

123

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BasicLinqSyntax
{
    class Program
    {
        static void Main(string[] args)
        {
            ProductInfo[] itemsInStock = //new[] 
            {

                new ProductInfo {Name="Mac's Coffee", Description="CoffeeWithTeeth",NumberInStock=24 },
                new ProductInfo {Name="Milk Maid Milk", Description="Milk cows love",NumberInStock=100 },
                new ProductInfo {Name="Pure Silk Tofu", Description="Bland is Possible",NumberInStock=120 },
                new ProductInfo {Name="CruchyPops", Description="Cheesy, peppery goodness",NumberInStock=2 },
                new ProductInfo {Name="Rip Off Water", Description="From the Tap to Your vallet",NumberInStock=100 },
                new ProductInfo {Name="Classic Valpo Pizza", Description="Everyone loves pizza",NumberInStock=73 }

            };

            SelectEveryThing(itemsInStock);
            SelectProductNames(itemsInStock);
            SelectWhereExample(itemsInStock);
            ProectionOfNewDataType(itemsInStock);
            GetCountFromQuery(itemsInStock);
            OrderByQuery(itemsInStock);

            
            Array objs = ProectionOfNewDataTypeReturn(itemsInStock); // with return
            foreach (object o in objs) { Console.WriteLine(o); }


            DisplayDiff();
            DisplayInterSection();
            DisplayUnion();
            DisplayConcat();
            DisplayConcatDistinct();

            Console.ReadLine();

        }

        static void SelectEveryThing(ProductInfo[] products)
        {
            Console.WriteLine("select all");
            var all = from p in products select p;
            foreach (var p in all) Console.WriteLine(p);
            Console.WriteLine("   ");
        }

        static void SelectProductNames(ProductInfo[] products)
        {
            Console.WriteLine("Only product names:");
            var names = from p in products select p.Name;
            foreach (var p in names) Console.WriteLine(p);
            Console.WriteLine("   ");
        }

        static void SelectWhereExample(ProductInfo[] products)
        {
            Console.WriteLine("SelectWhereExample:");
            var subset = from p in products where p.NumberInStock > 25 && p.Name.Length > 10 select p;
            foreach (var p in subset) Console.WriteLine(p);
            Console.WriteLine("   ");
        }

        static void ProectionOfNewDataType(ProductInfo[] products)
        {

            Console.WriteLine("ProectionOfNewDataType - will create new objects:");
            var subset = from p in products select new { p.Name, p.Description };
            foreach (var p in subset) Console.WriteLine(p);
            // return subset; // << will not compile
            Console.WriteLine("   ");
        }

        static Array ProectionOfNewDataTypeReturn(ProductInfo[] products) {
            Console.WriteLine("ProectionOfNewDataTypeReturn - will create new objects:");
            var subset = from p in products select new { p.Name, p.Description };
            foreach (var p in subset) Console.WriteLine(p);

            Console.WriteLine("   ");
            return subset.ToArray(); // << will not compile

        }

        static void GetCountFromQuery(ProductInfo[] products)
        {

            int count = (from p in products select p).Count<ProductInfo>();
            Console.WriteLine("Count in query = " + count);
            Console.WriteLine("   ");

        }

        static void ReverseSubsetQuery(ProductInfo[] products)
        {

            Console.WriteLine("select all and reverse");
            var all = from p in products select p;
            foreach (var p in all.Reverse()) Console.WriteLine(p);
            Console.WriteLine("   ");

        }

        static void OrderByQuery(ProductInfo[] products)
        {

            Console.WriteLine("OrderBy Query");
            var all = from p in products orderby p.Name ascending select p;
            foreach (var p in all.Reverse()) Console.WriteLine(p);
            Console.WriteLine("   ");

        }

        static void DisplayDiff() {
            List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };
            List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

            var carDiff = (from c in myCars select c).Except(from c2 in yourCars select c2);
            Console.WriteLine("Here is what you don't have but I do:");
            foreach (var s in carDiff) Console.WriteLine(s);
        }

        static void DisplayInterSection() {
            List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };
            List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

            var carIntersect = (from c in myCars select c).Intersect(from c2 in yourCars select c2);
            Console.WriteLine("Here is what we have in intersection:");
            foreach (var s in carIntersect) Console.WriteLine(s);
        }

        static void DisplayUnion()
        {
            List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };
            List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

            var carUnion = (from c in myCars select c).Union(from c2 in yourCars select c2);
            Console.WriteLine("Here is what we have in Union:");
            foreach (var s in carUnion) Console.WriteLine(s);
        }

        static void DisplayConcat()
        {
            List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };
            List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

            var carConcat = (from c in myCars select c).Concat(from c2 in yourCars select c2);
            Console.WriteLine("Here is what we have in Concat:");
            foreach (var s in carConcat) Console.WriteLine(s);
        }


        static void DisplayConcatDistinct()
        {
            List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };
            List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

            var carConcat = (from c in myCars select c).Concat(from c2 in yourCars select c2);
            Console.WriteLine("Here is what we have in ConcatDistinct:");
            foreach (var s in carConcat.Distinct()) Console.WriteLine(s);
        }


        static void AggregateOps() {
            double[] winterTemps = { 2.0, -21.3, 8, -4, 0, 8.2 };
            Console.WriteLine("Max temp is {0}", (from t in winterTemps select t).Max());
            Console.WriteLine("Min temp is {0}", (from t in winterTemps select t).Min());
            Console.WriteLine("Average temp is {0}", (from t in winterTemps select t).Average());
            Console.WriteLine("Sum temp is {0}", (from t in winterTemps select t).Sum());
        }

    }

    class ProductInfo
    {
        public string Name { get; set; }
        public string Description { get; set; }
        public int NumberInStock { get; set; }
        public override string ToString()
        {
            return string.Format("Name={0},Description={1},Number in Stock={2}", Name, Description, NumberInStock);
        }
    }
}

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace BasicLinqSyntax

{

class Program

{

static void Main(string[] args)

{

ProductInfo[] itemsInStock = //new[]

{

new ProductInfo {Name="Mac's Coffee", Description="CoffeeWithTeeth",NumberInStock=24 },

new ProductInfo {Name="Milk Maid Milk", Description="Milk cows love",NumberInStock=100 },

new ProductInfo {Name="Pure Silk Tofu", Description="Bland is Possible",NumberInStock=120 },

new ProductInfo {Name="CruchyPops", Description="Cheesy, peppery goodness",NumberInStock=2 },

new ProductInfo {Name="Rip Off Water", Description="From the Tap to Your vallet",NumberInStock=100 },

new ProductInfo {Name="Classic Valpo Pizza", Description="Everyone loves pizza",NumberInStock=73 }

};

SelectEveryThing(itemsInStock);

SelectProductNames(itemsInStock);

SelectWhereExample(itemsInStock);

ProectionOfNewDataType(itemsInStock);

GetCountFromQuery(itemsInStock);

OrderByQuery(itemsInStock);

Array objs = ProectionOfNewDataTypeReturn(itemsInStock); // with return

foreach (object o in objs) { Console.WriteLine(o); }

DisplayDiff();

DisplayInterSection();

DisplayUnion();

DisplayConcat();

DisplayConcatDistinct();

Console.ReadLine();

}

static void SelectEveryThing(ProductInfo[] products)

{

Console.WriteLine("select all");

var all = from p in products select p;

foreach (var p in all) Console.WriteLine(p);

Console.WriteLine(" ");

}

static void SelectProductNames(ProductInfo[] products)

{

Console.WriteLine("Only product names:");

var names = from p in products select p.Name;

foreach (var p in names) Console.WriteLine(p);

Console.WriteLine(" ");

}

static void SelectWhereExample(ProductInfo[] products)

{

Console.WriteLine("SelectWhereExample:");

var subset = from p in products where p.NumberInStock > 25 && p.Name.Length > 10 select p;

foreach (var p in subset) Console.WriteLine(p);

Console.WriteLine(" ");

}

static void ProectionOfNewDataType(ProductInfo[] products)

{

Console.WriteLine("ProectionOfNewDataType - will create new objects:");

var subset = from p in products select new { p.Name, p.Description };

foreach (var p in subset) Console.WriteLine(p);

// return subset; // << will not compile

Console.WriteLine(" ");

}

static Array ProectionOfNewDataTypeReturn(ProductInfo[] products) {

Console.WriteLine("ProectionOfNewDataTypeReturn - will create new objects:");

var subset = from p in products select new { p.Name, p.Description };

foreach (var p in subset) Console.WriteLine(p);

Console.WriteLine(" ");

return subset.ToArray(); // << will not compile

}

static void GetCountFromQuery(ProductInfo[] products)

{

int count = (from p in products select p).Count<ProductInfo>();

Console.WriteLine("Count in query = " + count);

Console.WriteLine(" ");

}

static void ReverseSubsetQuery(ProductInfo[] products)

{

Console.WriteLine("select all and reverse");

var all = from p in products select p;

foreach (var p in all.Reverse()) Console.WriteLine(p);

Console.WriteLine(" ");

}

static void OrderByQuery(ProductInfo[] products)

{

Console.WriteLine("OrderBy Query");

var all = from p in products orderby p.Name ascending select p;

foreach (var p in all.Reverse()) Console.WriteLine(p);

Console.WriteLine(" ");

}

static void DisplayDiff() {

List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };

List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

var carDiff = (from c in myCars select c).Except(from c2 in yourCars select c2);

Console.WriteLine("Here is what you don't have but I do:");

foreach (var s in carDiff) Console.WriteLine(s);

}

static void DisplayInterSection() {

List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };

List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

var carIntersect = (from c in myCars select c).Intersect(from c2 in yourCars select c2);

Console.WriteLine("Here is what we have in intersection:");

foreach (var s in carIntersect) Console.WriteLine(s);

}

static void DisplayUnion()

{

List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };

List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

var carUnion = (from c in myCars select c).Union(from c2 in yourCars select c2);

Console.WriteLine("Here is what we have in Union:");

foreach (var s in carUnion) Console.WriteLine(s);

}

static void DisplayConcat()

{

List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };

List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

var carConcat = (from c in myCars select c).Concat(from c2 in yourCars select c2);

Console.WriteLine("Here is what we have in Concat:");

foreach (var s in carConcat) Console.WriteLine(s);

}

static void DisplayConcatDistinct()

{

List<string> myCars = new List<string>() { "Yugo", "Aztec", "BMW" };

List<string> yourCars = new List<string>() { "BMW", "SAAB", "Aztec" };

var carConcat = (from c in myCars select c).Concat(from c2 in yourCars select c2);

Console.WriteLine("Here is what we have in ConcatDistinct:");

foreach (var s in carConcat.Distinct()) Console.WriteLine(s);

}

static void AggregateOps() {

double[] winterTemps = { 2.0, -21.3, 8, -4, 0, 8.2 };

Console.WriteLine("Max temp is {0}", (from t in winterTemps select t).Max());

Console.WriteLine("Min temp is {0}", (from t in winterTemps select t).Min());

Console.WriteLine("Average temp is {0}", (from t in winterTemps select t).Average());

Console.WriteLine("Sum temp is {0}", (from t in winterTemps select t).Sum());

}

class ProductInfo

{

public string Name { get; set; }

public string Description { get; set; }

public int NumberInStock { get; set; }

public override string ToString()

{

return string.Format("Name={0},Description={1},Number in Stock={2}", Name, Description, NumberInStock);

}

Posted in C# | Comments Off

C#.OfTypeAsFilter

Posted on 27.08.2017 by Stanislav_Panteleev

Non generic collections may have different stuff, we can filter them

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Linq.FiltrationWithOfType
{
    class Program
    {
        static void Main(string[] args)
        {
            OfTypeAsFilter();
            Console.ReadLine();
        }

        static void OfTypeAsFilter() {
            ArrayList myStuff = new ArrayList();
            myStuff.AddRange(new object[] { 10, 400, 8, false, new object(), "string data" } );
            var myInts = myStuff.OfType<int>(); // will filter only ints
            foreach (var i in myInts) Console.WriteLine(i);
        }
    }
}

using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Linq.FiltrationWithOfType

{

class Program

{

static void Main(string[] args)

{

OfTypeAsFilter();

Console.ReadLine();

}

static void OfTypeAsFilter() {

ArrayList myStuff = new ArrayList();

myStuff.AddRange(new object[] { 10, 400, 8, false, new object(), "string data" } );

var myInts = myStuff.OfType<int>(); // will filter only ints

foreach (var i in myInts) Console.WriteLine(i);

}

Posted in C# | Comments Off

C#. Linq and Non generic collections, using OfType

Posted on 27.08.2017 by Stanislav_Panteleev

Main idea is to use OfType<T> to cast to generic variant

using System;
using System.Collections.Generic;
using System.Collections; // << non generic
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LinqAndNonGenericCollections
{
    class Program
    {
        static void Main(string[] args)
        {
            LinqOverArrayList();
            Console.ReadLine();
        }

        static void LinqOverArrayList() {
            ArrayList cars = new ArrayList() // << non generic
            {
                new Car {PetName="BMW",Color="1234",Speed=10,Make=123456 },
                new Car {PetName="Lada",Color="1234",Speed=20,Make=123456 },
                new Car {PetName="Mitsubishi",Color="1234",Speed=30,Make=123456 },
                new Car {PetName="Ferrari",Color="1234",Speed=40,Make=123456 }
            };

            // transform ArrayList in type compatible to IEnumerable<T>
            var carsEnum = cars.OfType<Car>(); // <<< !!!
            var fastCars = from c in carsEnum where c.Speed > 20 select c;
            foreach (var car in fastCars) { Console.WriteLine(car.PetName); }
        }
    }


    class Car
    {
        public string PetName { get; set; }
        public string Color { get; set; }
        public int Speed { get; set; }
        public int Make { get; set; }
    }

}

using System;

using System.Collections.Generic;

using System.Collections; // << non generic

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace LinqAndNonGenericCollections

{

class Program

{

static void Main(string[] args)

{

LinqOverArrayList();

Console.ReadLine();

}

static void LinqOverArrayList() {

ArrayList cars = new ArrayList() // << non generic

{

new Car {PetName="BMW",Color="1234",Speed=10,Make=123456 },

new Car {PetName="Lada",Color="1234",Speed=20,Make=123456 },

new Car {PetName="Mitsubishi",Color="1234",Speed=30,Make=123456 },

new Car {PetName="Ferrari",Color="1234",Speed=40,Make=123456 }

};

// transform ArrayList in type compatible to IEnumerable<T>

var carsEnum = cars.OfType<Car>(); // <<< !!!

var fastCars = from c in carsEnum where c.Speed > 20 select c;

foreach (var car in fastCars) { Console.WriteLine(car.PetName); }

}

class Car

{

public string PetName { get; set; }

public string Color { get; set; }

public int Speed { get; set; }

public int Make { get; set; }

}

Posted in C# | Comments Off

C#. LinqAndCollections

Posted on 27.08.2017 by Stanislav_Panteleev

123

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LinqAndCollections
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Car> Cars = new List<Car>() {
                new Car {PetName="BMW",Color="1234",Speed=10,Make=123456 },
                new Car {PetName="Lada",Color="1234",Speed=20,Make=123456 },
                new Car {PetName="Mitsubishi",Color="1234",Speed=30,Make=123456 },
                new Car {PetName="Ferrari",Color="1234",Speed=40,Make=123456 }
            };

            GetFastCars(Cars);
            Console.WriteLine("   ");
            GetFastFerrari(Cars);
            Console.ReadLine();

    }

        static void GetFastCars(List<Car> Cars)
        {
            var fastCars = from c in Cars where c.Speed > 20 select c;
            foreach (var car in fastCars) Console.WriteLine(car.PetName);
        }

        static void GetFastFerrari(List<Car> Cars)
        {
            var fastCarsBMW = from c in Cars where c.Speed > 20 && c.PetName == "Ferrari" select c;
            foreach (var car in fastCarsBMW) Console.WriteLine(car.PetName);
        }

    }

    class Car {
        public string PetName { get; set; }
        public string Color { get; set; }
        public int Speed { get; set; }
        public int Make { get; set; }
    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace LinqAndCollections

{

class Program

{

static void Main(string[] args)

{

List<Car> Cars = new List<Car>() {

new Car {PetName="BMW",Color="1234",Speed=10,Make=123456 },

new Car {PetName="Lada",Color="1234",Speed=20,Make=123456 },

new Car {PetName="Mitsubishi",Color="1234",Speed=30,Make=123456 },

new Car {PetName="Ferrari",Color="1234",Speed=40,Make=123456 }

};

GetFastCars(Cars);

Console.WriteLine(" ");

GetFastFerrari(Cars);

Console.ReadLine();

}

static void GetFastCars(List<Car> Cars)

{

var fastCars = from c in Cars where c.Speed > 20 select c;

foreach (var car in fastCars) Console.WriteLine(car.PetName);

}

static void GetFastFerrari(List<Car> Cars)

{

var fastCarsBMW = from c in Cars where c.Speed > 20 && c.PetName == "Ferrari" select c;

foreach (var car in fastCarsBMW) Console.WriteLine(car.PetName);

}

class Car {

public string PetName { get; set; }

public string Color { get; set; }

public int Speed { get; set; }

public int Make { get; set; }

}

Posted in C# | Comments Off

Category Archives: C#

C#. Shared assembly

С#. Assembly theory

C#. Creating one file assembly. Example

C#. Namespace examples

C#. Delegates, Func, Action

C#. Func template for delegates

C#. Syntax simple examples

C#.OfTypeAsFilter

C#. Linq and Non generic collections, using OfType

C#. LinqAndCollections

MY PROJECTS

Recent Posts

Categories