Microsoft introduced a preview of the latest edition of its flagship RDBMS, SQL Server 2019, highlighting new Big Data capabilities.
متود زیر برای تولید عبارت مبتنی بر الگو زمانی که الگو پیچیده‌تر از این است که بشود با string.Format به راحتی پیاده سازی شود ولی چندان هم پیچیده نیست که ابزارهای حرفه ای‌تری مانند T4 یا Razor به کار بیایند، میتواند مورد استفاده قرار گیرد:
/// <summary>
/// Insert values from an object into a string pattern. To specify the object's property you have to use the '{propertyName}'.
/// </summary>
/// <remarks>
/// This method is a replacement to String.Format, but it has two differences:
/// <list type="simple">
/// <item>It reverese the order you call the functionality, instead of writing String.Format(pattern, args) you write pattern.FillByObject(args). This makes the code look cleaner.</item>
/// <item>You supply the pattern with an object and specify insertion points by property names.</item>
/// </list>
/// <example>
/// <![CDATA[
/// "First name:{firstName}, Sur name:{Surname}".FillByObject(new {firstName = "Sam", lastName="Naseri"});
/// ]]>
/// </example>
/// </remarks>
/// <seealso cref="Fill"/>
/// <typeparam name="T">Type of bindingValue.</typeparam>
/// <param name="bindingPattern">The pattern to fill.</param>
/// <param name="bindingValue">The object providing values to fill in the pattern.</param>
/// <returns>The pattern filled with values.</returns>
public static string FillByObject<T>(this string bindingPattern, T bindingValue)
{
var properties = GetProperties(typeof(T)).ToList();
var values = properties.Select(property => property.GetValue(bindingValue, new object[] { })).ToList();
var result = bindingPattern;
for (int index = 0; index < properties.Count; index++)
{
var property = properties[index];
var propPattern = "{" + property.Name + "}";
var old = result;
result = result.Replace(propPattern, values[index] != null ? values[index].ToString() : "");
}
return result;
}پیاده سازی فوق یک پیاده سازی بسیار خام و بسیار کند است و جای بهبود زیادی دارد. من فقط برای سناریوهای ساده که کارایی مطرح نیست استفاده از متود فوق را توصیه میکنم.
متودهای جانبی مورد نیاز:
private static IEnumerable<PropertyInfo> GetProperties(Type t)
{
return t.GetProperties(BindingFlags.Public | BindingFlags.Instance);
}همچنین متود زیر هم میتواند نوشتن string.Format را یک خرده ساده‌تر کند:
/// <summary>
/// A simple replacement for String.Format which only makes the codes look nicer.
/// </summary>
/// <param name="pattern">The source string that you want to replace insertion points on it.</param>
/// <param name="args">Values to be replaced in the pattern.</param>
/// <returns></returns>
public static string Fill(this string pattern, params object[] args)
{
return string.Format(pattern, args);
}Blazor C# Tutorials
30 videos
In this playlist, I am going through all the fundamentals and sharing my journey to be a full stack Blazor developer. This is the future of web development in ASP.NET world. If you want to learn Blazor this is the best place to start.
1. Build Your First App - EP01
2. Getting Started - EP02
3. #Routing - EP03
4. Dependency #Injection - EP04
5. Forms & #Validations - EP05
6. JavaScript #Interop - EP06
7. #Razor #Components | Re-usability - EP07
8. Razor Components | #Lifecycle Methods - EP08
9. Razor Component #Libraries - EP09
10. Call #REST #API - #CRUD Methods - EP10
11. #Authentication | Out of the box- EP11
12. Custom AuthenticationStateProvider - EP12
13. Layouts | Login Pages - EP13
14. HttpClient | Login User
15. IHttpClientFactory | Login User
16. Sending JWT token & Request Middleware
17. Handling Exceptions
A Quick Understanding of REST
Welcome to the April 2019 release of Visual Studio Code. During April, we were busy with the Preview release of the Remote Development extensions. These extensions let you work with VS Code over SSH on a remote machine or VM, in Windows Subsystem for Linux (WSL), or inside a Docker container.
These are the customer-reported issues addressed in 15.7.4:
- Green squiggles and light bulb with "Macro in skipped region" message.
- F7 does not switch to code.
- F7 does not build anymore.
- F7 build does not work.
- LINK : error : Telemetry event upload failed: 'Failed to open connection to VCTIP'.
- AXML file doesn't open after update.
- F7 no longer toggles between the designer and the code.
- XAML Editor Error: Window is not supported in WPF project.
- WinForms View.ToggleDesigner does not work as it used to.
- Toggle designer key binding lost.
- F7 does not start a new build.
- F7 no longer toggles between Designer and Code views.
- There is a problem with structure definition in C language.
- Provisioning a new SQL Server and new SQL DB in a different region than the App Service plan fails.
Git Security Vulnerability
We also fixed a security vulnerability in Git that was disclosed by the Git community. The vulnerability can lead to arbitrary code execution when a user clones a malicious repository. This blog post has more information.
I am starting to develop more with ASP.NET 5. My journey through beta 5 to 8 has been an interesting one, with much left unexplored. This post hopes to poke fun at me. Developers may receive insight into what it is like transitioning to the new platform
This extension uses the Roslyn compiler plattform to identify IDisposable-instances that are not disposed.
IDisposable instances that are not disposed, usually lead to some hard-to-find errors like memoryleaks. The current version is only able to find this undisposed instances, future version should also provide code-fixes.
Update and upgrade are two different ways to make a change to an app or operating system. But the prime difference lies in a number of modifications made and the importance of those modifications. A software update includes bug fixes, and other small improvements, while a software upgrade changes the version of a software
These are the customer-reported issues addressed in this version:
Visual Studio crashes when you open a solution with a test project.
Visual Studio Freezes in Debug with Chrome.
Failure to install HelpViewer.
UI delay while typing R code.
C# 7.0 Regression in Tuples.
Xamarin - Dynamic Type Platform not supported exception.
Xamarin – Dynamic object is not supported.
Xamarin - Xamarin.iOS: ArgumentNullException for instruction parameter in Mono.Linker's MarkException() method.
