این مورد سمت ارسال java script است.
از سمت #c چطوری میشه هندل کرد
var integerArray = new int[3]; var lastItem = integerArray[integerArray.Length - 1];
var integerList = integerArray.ToList(); integerList.Last();
var secondToLast = integerArray[integerArray.Length - 2];
var lastItem = integerArray[^1];
var words = new string[] { // index from start index from end "The", // 0 ^9 "quick", // 1 ^8 "brown", // 2 ^7 "fox", // 3 ^6 "jumped", // 4 ^5 "over", // 5 ^4 "the", // 6 ^3 "lazy", // 7 ^2 "dog" // 8 ^1 }; // 9 (or words.Length) ^0
Console.WriteLine($"The last word is {words[words.Length - 1]}");
var index = new Index(value: 1, fromEnd: true); Index indexStruct = ^1; var indexShortHand = ^1;
int[] a = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; Console.WriteLine(a[a.Length – 2]); // will write 8 on console. Console.WriteLine(a[^2]); // will write 8 on console. Index i5 = 5; Console.WriteLine(a[i5]); //will write 5 on console. Index i2fromEnd = ^2; Console.WriteLine(a[i2fromEnd]); // will write 8 on console.
var numbers = Enumerable.Range(1, 10).ToArray();
var (start, end) = (1, 7); var length = end - start; // Using LINQ var subset1 = numbers.Skip(start).Take(length); // Or using Array.Copy var subset2 = new int[length]; Array.Copy(numbers, start, subset2, 0, length);
var myArray = new string[] { "Item1", "Item2", "Item3", "Item4", "Item5" };
var fromIndexToX = myArray[1..3]; // = [Item2, Item3]
var fromIndexToXFromTheEnd = myArray[1..^1]; // = [ "Item2", "Item3", "Item4" ]
var fromAnIndexToTheEnd = myArray[1..]; // = [ "Item2", "Item3", "Item4", "Item5" ]
var fromTheStartToAnIndex = myArray[..3]; // = [ "Item1", "Item2", "Item3" ]
var entireRange = myArray[..]; // = [ "Item1", "Item2", "Item3", "Item4", "Item5" ]
var myArray = new string[] { "Item1", "Item2", "Item3", "Item4", "Item5" }; for (int i = 1; i <= 3; i++) { Console.WriteLine(myArray[i]); }
foreach (var item in myArray[1..4]) // = [ "Item2", "Item3", "Item4" ] { Console.WriteLine(item); }
using System; using System.Linq; namespace ConsoleApp { class Program { private static readonly int[] _numbers = Enumerable.Range(1, 10).ToArray(); static void Main() { var skip2CharactersAndTake2Characters = _numbers[2..4]; // صرفنظر کردن از دو عنصر اول و سپس انتخاب دو عنصر var skipFirstAndLastCharacter = _numbers[1..^1]; // صرفنظر کردن از دو عنصر اول و آخر var last3Characters = _numbers[^3..]; // انتخاب بازهای شامل سه عنصر آخر var first4Characters = _numbers[0..4]; // دریافت بازهای از 4 عنصر اول var rangeStartFrom2 = _numbers[2..]; // دریافت بازهای شروع شده از المان دوم تا آخر var skipLast3Characters = _numbers[..^3]; // صرفنظر کردن از سه المان آخر var rangeAll = _numbers[..]; // انتخاب کل بازه } } }
var range = new Range(1, 4); Range rangeStruct = 1..4; var rangeShortHand = 1..4;
using System; using System.Linq; namespace ConsoleApp { class Program { private static readonly int[] _numbers = Enumerable.Range(1, 10).ToArray(); static void Print(Range range) => Console.WriteLine($"{range} => {string.Join(", ", _numbers[range])}"); static void Main() { Print(1..3); // 1..3 => 2, 3 Print(..3); // 0..3 => 1, 2, 3 Print(3..); // 3..^0 => 4, 5, 6, 7, 8, 9, 10 Print(1..^1); // 1..^1 => 2, 3, 4, 5, 6, 7, 8, 9 Print(^2..^1); // ^2..^1 => 9 } } }
Console.WriteLine("123456789"[1..4]); // Would output 234
var helloWorldStr = "Hello, World!"; var hello = helloWorldStr[..5]; Console.WriteLine(hello); // Output: Hello var world = helloWorldStr[7..]; Console.WriteLine(world); // Output: World! var world2 = helloWorldStr[^6..]; // Take the last 6 characters Console.WriteLine(world); // Output: World!
var arr = (new[] { 1, 4, 8, 11, 19, 31 }).AsSpan(); var range = arr[2..5]; ref int elt1 = ref range[1]; elt1 = -1; int copiedElement = range[2]; copiedElement = -2; Console.WriteLine($"range[1]: {range[1]}, range[2]: {range[2]}"); // output: range[1]: -1, range[2]: 19 Console.WriteLine($"arr[3]: {arr[3]}, arr[4]: {arr[4]}"); // output: arr[3]: -1, arr[4]: 19
using System; using System.Collections.Generic; namespace Test { public class Table { public Header Header { set; get; } public IList<Cell> Cells { set; get; } public float Width { set; get; } } public class Header { public string Title { set; get; } public DateTime Date { set; get; } public IList<Cell> Cells { set; get; } } public class Cell { public string Caption { set; get; } public float Width { set; get; } } }
using System; using System.Collections.Generic; namespace Test { public class TableApi { public Table CreateTable(Action<TableCreator> action) { var creator = new TableCreator(); action(creator); return creator.TheTable; } } public class TableCreator { readonly Table _theTable = new Table(); internal Table TheTable { get { return _theTable; } } public void Width(float value) { _theTable.Width = value; } public void AddHeader(Action<HeaderCreator> action) { _theTable.Header = ... } public void AddCells(Action<CellsCreator> action) { _theTable.Cells = ... } } }
using System; using System.Collections.Generic; namespace Test { public class CellsCreator { readonly IList<Cell> _cells = new List<Cell>(); internal IList<Cell> Cells { get { return _cells; } } public void AddCell(string caption, float width) { _cells.Add(new Cell { Caption = caption, Width = width }); } } public class HeaderCreator { readonly Header _header = new Header(); internal Header Header { get { return _header; } } public void Title(string title) { _header.Title = title; } public void Date(DateTime value) { _header.Date = value; } public void AddCells(Action<CellsCreator> action) { var creator = new CellsCreator(); action(creator); _header.Cells = creator.Cells; } } }
using System; using System.Collections.Generic; namespace Test { public class TableCreator { readonly Table _theTable = new Table(); internal Table TheTable { get { return _theTable; } } public void Width(float value) { _theTable.Width = value; } public void AddHeader(Action<HeaderCreator> action) { var creator = new HeaderCreator(); action(creator); _theTable.Header = creator.Header; } public void AddCells(Action<CellsCreator> action) { var creator = new CellsCreator(); action(creator); _theTable.Cells = creator.Cells; } } public class CellsCreator { readonly IList<Cell> _cells = new List<Cell>(); internal IList<Cell> Cells { get { return _cells; } } public void AddCell(string caption, float width) { _cells.Add(new Cell { Caption = caption, Width = width }); } } public class HeaderCreator { readonly Header _header = new Header(); internal Header Header { get { return _header; } } public void Title(string title) { _header.Title = title; } public void Date(DateTime value) { _header.Date = value; } public void AddCells(Action<CellsCreator> action) { var creator = new CellsCreator(); action(creator); _header.Cells = creator.Cells; } } }
var data = new TableApi().CreateTable(table => { table.Width(1); table.AddHeader(header=> { header.Title("new rpt"); header.Date(DateTime.Now); header.AddCells(cells=> { cells.AddCell("cell 1", 1); cells.AddCell("cell 2", 2); }); }); table.AddCells(tableCells=> { tableCells.AddCell("c 1", 1); tableCells.AddCell("c 2", 2); }); });
match expr with | pat1 -> result1 | pat2 -> result2 | pat3 when expr2 -> result3 | _ -> defaultResult
let booleanToString x = match x with false -> "False" | _ -> "True"
let stringToBoolean x = match x with | "True" | "true" -> true | "False" | "false" -> false | _ -> failwith "unexpected input"
printfn "(booleanToString true) = %s"
(booleanToString true)
printfn "(booleanToString false) = %s"
(booleanToString false)
printfn "(stringToBoolean \"True\") = %b"
(stringToBoolean "True")
printfn "(stringToBoolean \"false\") = %b"
(stringToBoolean "false")
printfn "(stringToBoolean \"Hello\") = %b"
(stringToBoolean "Hello")
(booleanToString true) = True
(booleanToString false) = False
(stringToBoolean "True") = true
(stringToBoolean "false") = false
Microsoft.FSharp.Core.FailureException: unexpected input
at FSI_0005.stringToBoolean(String x)
at <StartupCode$FSI_0005>.$FSI_0005.main@()
let myOr b1 b2 = match b1, b2 with | true, _ -> true //b1 true , b2 true or false | _, true -> true // b1 true or false , b2 true | _ -> false
printfn "(myOr true false) = %b" (myOr true false) printfn "(myOr false false) = %b" (myOr false false)
(myOr true false) = true (myOr false false) = false
let sign = function | 0 -> 0 | x when x < 0 -> -1 | x when x > 0 -> 1
if expr then expr elif expr then expr elif expr then expr ... else expr
let result = match System.DateTime.Now.Second % 2 = 0 with | true -> "heads" | false -> "tails"
let result = if System.DateTime.Now.Second % 2 = 0 then box "heads" else box false printfn "%A" result
interface ILogger { void Log(string message); } class ConsoleLogger : ILogger { public void Log(string message) { Console.WriteLine(message); } }
interface ILogger { void Log(string message); void Log(Exception exception) => Console.WriteLine(exception); }
interface IDeveloper { void LearnNewLanguage(string language, DateTime dueDate); void LearnNewLanguage(string language) { // default implementation LearnNewLanguage(language, DateTime.Now.AddMonths(6)); } } class BackendDev : IDeveloper // compiles OK { public void LearnNewLanguage(string language, DateTime dueDate) { // Learning new language... } }
IDeveloper dev1 = new BackendDev(); dev1.LearnNewLanguage("Rust"); var dev2 = new BackendDev(); dev2.LearnNewLanguage("Rust");
There is no argument given that corresponds to the required formal parameter 'dueDate' of 'BackendDev.LearnNewLanguage(string, DateTime)' (CS7036) [ConsoleApp]
using System; namespace ConsoleApp { public interface IDev { void LearnNewLanguage(string language) => Console.Write($"Learning {language} in a default way."); } public interface IBackendDev : IDev { void LearnNewLanguage(string language) => Console.Write($"Learning {language} in a backend way."); } public interface IFrontendDev : IDev { void LearnNewLanguage(string language) => Console.Write($"Learning {language} in a frontend way."); } public interface IFullStackDev : IBackendDev, IFrontendDev { } public class Dev : IFullStackDev { } }
IFullStackDev dev = new Dev(); dev.LearnNewLanguage("TypeScript");
The call is ambiguous between the following methods or properties: 'IBackendDev.LearnNewLanguage(string)' and 'IFrontendDev.LearnNewLanguage(string)' (CS0121)
namespace MyNamespace { public interface IMyInterface { IList<int> Values { get; set; } } public static class MyInterfaceExtensions { public static int CountGreaterThan(this IMyInterface myInterface, int threshold) { return myInterface.Values?.Where(p => p > threshold).Count() ?? 0; } } }
var myImplementation = new MyInterfaceImplementation(); // Note that there's no typecast to IMyInterface required var countGreaterThanFive = myImplementation.CountGreaterThan(5);
mklink /j C:\android-sdk "C:\Program Files (x86)\Android\android-sdk"
<AotAssemblies>true</AotAssemblies> <EnableLLVM>true</EnableLLVM>
C:\>dotnet --version 1.0.1
D:\vs-code-examples\FirstAspNetCoreProject>dotnet new --help Getting ready... Template Instantiation Commands for .NET Core CLI. Usage: dotnet new [arguments] [options] Arguments: template The template to instantiate. Options: -l|--list List templates containing the specified name. -lang|--language Specifies the language of the template to create -n|--name The name for the output being created. If no name is specified, the name of the current directory is used. -o|--output Location to place the generated output. -h|--help Displays help for this command. -all|--show-all Shows all templates Templates Short Name Language Tags ---------------------------------------------------------------------- Console Application console [C#], F# Common/Console Class library classlib [C#], F# Common/Library Unit Test Project mstest [C#], F# Test/MSTest xUnit Test Project xunit [C#], F# Test/xUnit ASP.NET Core Empty web [C#] Web/Empty ASP.NET Core Web App mvc [C#], F# Web/MVC ASP.NET Core Web API webapi [C#] Web/WebAPI Solution File sln Solution Examples: dotnet new mvc --auth None --framework netcoreapp1.1 dotnet new xunit --framework netcoreapp1.1 dotnet new --help
D:\vs-code-examples\FirstAspNetCoreProject>dotnet new mvc --auth None
D:\vs-code-examples\FirstAspNetCoreProject>code .
"terminal.integrated.shell.windows": "cmd.exe"
D:\vs-code-examples\FirstAspNetCoreProject>dotnet run Hosting environment: Production Content root path: D:\vs-code-examples\FirstAspNetCoreProject Now listening on: http://localhost:5000 Application started. Press Ctrl+C to shut down.