We’re introducing a new singleton service that will support generating a URL. This new service can be used from middleware, and does not require an HttpContext. For right now the set of things you can link to is limited to MVC actions, but this will expand in 3.0.
HTTP/2 PUSH is a feature that lets a server pre-emptively push resources to the client (without a corresponding request). HTTP Preload is a way to indicate to the browser resources it would require while loading the current page. In this post, we will discuss the key differences between PUSH and Preload, with a detailed explanation of which one to choose based on your use case.
If Not a And b Then ... Else ... EndIf
if(!(a) && b)
{
...
}
else
{
} public interface ICommand
{
}
public class Command1 : ICommand
{
}
public class Command2 : ICommand
{
} ICommand command = new Command1();
if (!(command is Command2))
{
} if (command is not Command2)
{
} if ((command is ICommand) && !(command is Command2))
{
} if (command is ICommand and not Command2)
{
} if (command is Command1 or Command2)
{
} var number = new Random().Next(1, 10);
if (number > 2 && number < 8)
{
} if (number is > 2 and < 8)
{
} public static bool IsLetterOrSeparator(char c) => (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '.' || c == ',';
public static bool IsLetterOrSeparator(char c) => c is (>= 'a' and <= 'z') or (>= 'A' and <= 'Z') or '.' or ',';
var number = new Random().Next(1, 10);
if (number <= 0)
{
Console.WriteLine("Less than or equal to 0");
}
else if (number > 0 && number <= 10)
{
Console.WriteLine("More than 0 but less than or equal to 10");
}
else
{
Console.WriteLine("More than 10");
} // C#9.0
switch (number)
{
case <= 0:
Console.WriteLine("Less than or equal to 0");
break;
case > 0 and <= 10:
Console.WriteLine("More than 0 but less than or equal to 10");
break;
default:
Console.WriteLine("More than 10");
break;
} // C#7.0
switch (number)
{
case int value when value <= 0:
Console.WriteLine("Less than or equal to 0");
break;
case int value when value > 0 && value <= 10:
Console.WriteLine("More than 0 but less than or equal to 10");
break;
default:
Console.WriteLine("More than 10");
break;
} var message = number switch
{
<= 0 => "Less than or equal to 0",
> 0 and <= 10 => "More than 0 but less than or equal to 10",
_ => "More than 10"
}; private static int GetDiscount(Product p) => p switch
{
Food => 0, // Food _ => 0 before C# 9
Book b => 75, // Book b _ => 75 before C# 9
_ => 25
}; A calendar table is a permanent table containing a list of dates and various components of those dates. These may be the result of DATEPART operations, time of year, holiday analysis, or any other creative operations we can think of.
از این جدول به عنوان راه حلی عمومی برای حل مشکل گروهبندی براساس بخش‌های مختلف تاریخ در تقویم‌های موجود و همچنین در طراحی تقویم کاری یک سازمان نیز می‌توان استفاده کرد.
What’s new in C# 12 and beyond | BRK203H
#MSBuild
Take a tour of upcoming language features in C#. While still very much in the works, C# 12 is starting to take shape. We touch on some of the longer-term work that the language design team is focused on.
When you start working on a new web application you will probably need to analyze different tools to deal with the different functionalities that you have to work on. As soon as you start searching for alternatives you are going to run across Angular and React, they are without any doubt two of the major options to consider, at least till today.
ASP.NET Core provides better support for clean, testable, maintainable architectures than any of its predecessors. Learn the underlying principles that apply to project/solution organization, how best to arrange your projects to support clean code, and how to refactor existing solutions toward this architecture. Examples will use ASP.NET Core but the principles covered apply to all languages and platforms.
var nums = Enumerable.Range( 0, 1000000 ).ToArray();
long total = 0;
// Use type parameter to make subtotal a long, not an int
Parallel.For< long >( 0, nums.Length, () => 0,
( j, loop, subtotal ) =>
{
subtotal += nums[j];
return subtotal;
},
x => Interlocked.Add( ref total, x ) );
Console.WriteLine( "The total is {0:N0}", total ); var nums = Enumerable.Range( 0, 1000000 ).ToArray();
long total = 0;
Parallel.ForEach< int, long >( nums, // source collection
() => 0, // method to initialize the local variable
( j, loop, subtotal ) => // method invoked by the loop on each iteration
{
subtotal += j; //modify local variable
return subtotal; // value to be passed to next iteration
},
// Method to be executed when each partition has completed.
// finalResult is the final value of subtotal for a particular partition.
finalResult => Interlocked.Add( ref total, finalResult ) );
Console.WriteLine( "The total from Parallel.ForEach is {0:N0}", total ); Console.WriteLine("IsInfinity(3.0 / 0) == {0}.", double.IsInfinity(3.0 / 0) ? "true" : "false"); با استفاده از نوع dynamic می توان عملیات چک کردن نوع در زمان کامپایل را پشت سر گذاشت و در عوض این عملیات را به زمان اجرا، موکول داد.
نکته: نوع dynamic همانند نوع object در بسیاری از شرایط، یکسان رفتار می‌کند. اگرچه عملیات‌هایی که شامل عبارت‌هایی از نوع dynamic هستند، یا نوع آن توسط کامپایلر بررسی می‌شوند و یا پذیرفته نمی‌شوند. کامپایلر اطلاعات مربوط به یک پردازش (روند) را یکجا بسته بندی می‌کند و این اطلاعات را بعداً در زمان اجرا ارزیابی می‌کند. به عنوان بخشی از این پردازش، متغیرهایی از نوع dynamic به متغیرهایی از نوع object کامپایل می‌شوند. بنابراین نوع dynamic فقط در زمان کامپایل وجود دارند (نه در زمان اجرا).
var i = 20;
dynamic dynamicVariable = i;
Console.WriteLine( dynamicVariable );
var stringVariable = "Example string.";
dynamicVariable = stringVariable;
Console.WriteLine( dynamicVariable );
var dateTimeVariable = DateTime.Today;
dynamicVariable = dateTimeVariable;
Console.WriteLine( dynamicVariable );
// The expression returns true unless dynamicVariable has the value null.
if ( dynamicVariable is dynamic )
Console.WriteLine( "dynamicVariable variable is dynamic" );
// dynamic and the as operator.
dynamicVariable = i as dynamic;
// throw RuntimeBinderException if the associated object doesn't have the specified method.
// The code is still compiling successfully.
Console.WriteLine( dynamicVariable.ToNow1 ); همانطور که در مثال بالا مشاهده می‌کنید، شما می‌توانید متغیرهایی از نوع‌های مختلف را به یک شی از نوع dynamic اختصاص دهید. همچنین می‌توانید برای بررسی یک متغیر که از نوع dynamic است یا خیر، از عملگر is استفاده کنید. اگر یک خصوصیت را که وجود ندارد، درخواست کنید (خط آخر مثال بالا)، خطای RuntimeBinderException پرتاب می‌شود.
dynamic sampleObject = new ExpandoObject();
sampleObject.FirstName = "Vahid";
sampleObject.LastName = "Mohammad Taheri";
sampleObject.Age = "28";
sampleObject.TestRemoveProperty = DateTime.Now;
sampleObject.AsString = new Action( () => Console.WriteLine( "{0} {1} is {2} years old.",
sampleObject.FirstName,
sampleObject.LastName,
sampleObject.Age ) );
sampleObject.AsString(); ( (IDictionary< String, Object >)sampleObject ).Remove( "TestRemoveProperty" );