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.NET Core

.NET-Core

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.NET Core nginx, and Postgres with EF on an rPi

by Marc Clifton

Implementing an SSL capable server in .NET Core WITHOUT ASP.NET, using nginx, and testing Postgres with EF, all running on an rPi

Elasticsearch, Kibana and Docker using .NET Standard 2

by Juan G. Carmona

Advanced logging in modern .NET applications. A Sunday-morning-proof-of-concept.

Slack Chatting with your rPi

by Marc Clifton

Talk to your rPi over a Slack channel, getting status, controlling devices, and running shell (bash) commands and viewing the console output posted back to your Slack channel

ASP.NET Core Road to Microservices Part 02: View Components

by Marcelo Ricardo de Oliveira

The second of many articles featuring design patterns, architectural designs, frameworks and technologies leading to ASP.NET Core Microservices

Latest Articles

NFT Wallets Unleashed: A Data Structures and Application Design Journey

by optiklab1

Exploring world of NFTs and blockchain while prototyping wallet CLI application with efficient data structures using C# and .NET Core

From Linear to Upper Triangular Matrix Indices

by Maniezzo

A couple of lines of code to get the i-j indices of an upper triangular matrix (main diagonal included) from a linerized array.

Batch Processing with Directory.EnumerateFiles

by Bohdan Stupak

Batching is a nice technique that allows you to handle big amounts of data gracefully. Directory.EnumerateFiles is the API that allows you to organize batch processing for the directory with a large number of files.

Inno Setup Dependency Installer

by DomGries

Download and install any dependency such as .NET, Visual C++ or SQL Server during your application's installation!

All Articles

.NET Core

Running an ASP.NET core app which is inside another ASP.NET core app

20 Feb 2018 by #realJSOP

I've never had to deal with this, but is it possible that putting the 2nd app into its own area would work? Areas | Microsoft Docs[^]

How to read a value in the HHTP headers in dotnet core 2.0

28 Mar 2018 by #realJSOP

In your action method, try this: Request.Headers["myHeaderKeyName"] BTW, the controller class is reinstantiated with every request, so your stored request value will be null unless you store it a different way.

How can I get(add user or remove user) the list of permissions for the share folder ?

25 May 2018 by #realJSOP

I found this code with a simple google search. using System; using System.Management; ... private static void ShareSecurity(string ServerName) { ConnectionOptions myConnectionOptions = new ConnectionOptions(); myConnectionOptions.Impersonation =...

Core/Razor Pages - The Bleeding Edge of MVC

25 Jan 2019 by #realJSOP

Sharing files between multiple web apps in a single solution.

How to transfer SQL data from one table to another using entity framework core

20 Apr 2019 by #realJSOP

Write a stored proc that adds the data to both tables, or set up a trigger.

entity-framework

Prevent multiple tabs

13 Jun 2019 by #realJSOP

"prevent multiple tabs in browser of a given web site" - Google Search[^]

Multiple Models In a MVC View

5 Nov 2021 by #realJSOP

One way to allow access to multiple model entities within a ASP.NET MVC view.

Auto-generated columns in a WPF ListView

18 Feb 2021 by #realJSOP

A WPF ListView that automatically generates columns (that are also sortable) based on decorated entity properties

How to Get Started with /n software .NET Core Internet Communications Components

10 Nov 2017 by /n software

This article will give you easy instructions for setting up /n software components in your development environment.

product-showcase

How do I remove \, \r, \n from a JSON response in .NET core 2 web API

8 Nov 2018 by 1suli0

Two HTTP headers are present, Content-Type:application/json and Accept:application/json My response look like this: "{\r\n \"auth_token\":...

How do I return complex object in POST request response body

14 Dec 2018 by 1suli0

Code goes like this: public async Task CreateUser(AppUser user, RegisterUserDto dto) { try { var result = await _userManager.CreateAsync(user, dto.Password); if (result.Succeeded) { ...

How do I return complex object in POST request response body

14 Dec 2018 by 1suli0

Configuring this in serializer options solved the problem. services.AddMvc(options=>....).AddJsonOptions(opt=> opt.SerializerSettings.ReferenceLoopHandling=Newtonsoft.Json.ReferenceLoopHandling.Ignore);

How does .NET core implement dependency injection for different lifetimes?

23 Apr 2020 by 855

how does .net core implement dependency injection for different lifetimes? how does a instance created and disposed for different lifetimes? What I have tried: What i could think is 1.singleton - use a global static dictionary to keep all the...

dependency-injection

.net core JWT API impliemntation at client side

20 Jan 2019 by abdu_karami

as I am new to the .Net Core, I am facing the following issue I have Authentication_API that returns JWT Token to the login controller at client side. After successfull login, I want to redirect to Home page. But when I use [Autherize] attribute to the controller it is not working. But without...

Error while trying to read XML from URL in ASP.NET core 2.1

23 Jul 2018 by Abhi1 Kanobi

I am trying to read a XML file from a URL and below is my code in .net core var url = "https://some.com/feeds/newfile.xml"; var httpClient = new HttpClient(); var result = httpClient.GetAsync(url).Result; var stream =...

How to get Microsoft azure active directory roles in dot net core

29 Jun 2020 by adhikar patil

Hello, I want to get microsoft azure active directory roles in dot net core using TenantId and RedirectUri. I am having ClientId, TenantId, RedirectUri, Endpoints. So now how to get microsoft azure active directory roles based on these keys...

Building String Razor Template Engine with Bare Hands (.NET Core)

25 Feb 2020 by ADOConnection

How ASP.NET Core Razor turns templates into assemblies and runs them

EntityFrameworkCore Seeding Component

9 May 2017 by Adriaan Booysen

Adding Seeding Framework towards EntityFrameworkCore that can be wired up in either a dotnet core Web Application or WebAPI

entity-framework

Creating Pipeline Using Microsoft Azure DevOps

30 Nov 2019 by aEmad

This article takes us to a journey of implementing a pipeline using Azure DevOps.

How do I resolve a situation where one API accepts an object but the other does not.

17 Dec 2019 by AFell2

Is the CPersonMasterBase class you are using as the "person" property an abstract class? If not, does it also have a parameterless constructor?

Creating and hosting ASP.NET Core application on Linux — Nothing Third-Party

14 Sep 2016 by Afzaal Ahmad Zeeshan

In this post I share a complete overview and explanation of creating and hosting ASP.NET Core applications on Linux environment -- without using any third-party plugins or libraries.

A guide for doing MVC on .NET core in vscode

10 Oct 2016 by Afzaal Ahmad Zeeshan

Good request that you are making here. Sadly, there are very less guides that take Visual Studio Code into considerations and the one that do take it into consideration talk about .NET Core applications, and not the ASP.NET applications. I am currently working on a book titled, "Considering...

Can we send PDF bytes to process for printing .NET core ubuntu

20 Nov 2016 by Afzaal Ahmad Zeeshan

Good question, :-)The fact is that this program allows you to strip out the file name from the command, then what it reads is the input that you pass to it, man page for lpr[^], reads as, Quote:If no names appear, the standard input is assumed.Input can be the bytes that you want to...

Learning SQLite databases in Xamarin for Android

19 Feb 2017 by Afzaal Ahmad Zeeshan

In this article I will give you a complete overview of SQLite databases in Android and how to consume them using Xamarin APIs.

How to save HTML string to word file in .NET core

23 Jul 2017 by Afzaal Ahmad Zeeshan

Besides what Solution 1 suggestions, which won't work in a cross-platform framework. There is an SDK by Microsoft, which you can use in .NET Core, since .NET framework and .NET Core (or .NET Standard) have a different mode of dependencies, and platform support, so they require a bit of...

Mission Impossible: Migrating .NET Core 1.x to 2.0

19 Aug 2017 by Afzaal Ahmad Zeeshan

.NET Core 2.0 brings a lot of improvements to the system, and it brings a lot of pain to the developers as well. I had a lot of problems upgrading .NET Core 1.x apps to .NET Core 2.0; I yet have to feel the promise it makes about performance and so, but let us see how to upgrade our existing applica

entity-framework

How to get system installed apps in windows using C# ?

25 Jun 2018 by Afzaal Ahmad Zeeshan

The actual question here is, how to tell that an app is installed by user or System (including the IT department, etc. etc.). To use the Registry and find all the apps installed you have already checked this SO thread. But again, what is the purpose of using .NET Core for a task that can be done...

How to resolve .NET core azure appservice 500 error

22 Nov 2018 by Afzaal Ahmad Zeeshan

That process needs to be debugged, you can use the Production Testing to do that, or you can even try to connect the Visual Studio to the live environment and do a live testing of the application. That way you will understand what is being missed on the environment; perhaps a missing...

How to get last record+1 when create new employee on web API project ?

16 Feb 2019 by Afzaal Ahmad Zeeshan

Apart from what Solution 1 tells, I have to recommend another approach. That approach is, to use string as the ID field in Entity Framework Core, and framework will automatically use Guid to generate the unique IDs. I have always used this, and this lets me sleep peacefully at night. Make the...

entity-framework

Real-time Emotion Detection with Azure Cognitive Services

15 Apr 2019 by Afzaal Ahmad Zeeshan

Integrating Cognitive Services SDKs in a .NET Core based application and exploring how real-world scenarios can be tackled using ML services offered by Microsoft

machine-learning

How to implement ADFS with existing ASP.NET core 2.0 MVC

18 Jun 2019 by Afzaal Ahmad Zeeshan

You need to check how WSFed is supported in .NET Core, see this link to understand how things have changed, ASP.NET MVC Core Authentication against On-Perm ADFS · Issue #1920 · aspnet/AspNetCore · GitHub[^].

Unable to expose any other port except port 80 for docker hosted app

18 Jun 2019 by Afzaal Ahmad Zeeshan

Maybe you are not understanding the purpose of EXPOSE in the Dockerfile. Read the second solution, and the link about exposing ports for ASP.NET Core and then continue reading the rest of the answer here. See this repository of mine, and check how this works. GitHub -...

How to validate email id exist or not using c#.net

22 Jun 2019 by Afzaal Ahmad Zeeshan

Please study how SMTP protocol works and how different SMTP service providers function. They do not allow, or sometimes they hide away the fact whether an account exists or not. I once worked on a project where we had to accept and receive the emails for every recipient email address (yes,...

How do I create a special directory

18 Sep 2020 by Afzaal Ahmad Zeeshan

I am not sure if Windows Defender will try to prevent folder creation in the Documents/Downloads folder; it should require elevated access or protection when working in Program Files or other sensitive folders. One thing I would like you to...

.net core and scripts

1 Dec 2020 by Afzaal Ahmad Zeeshan

.NET Core is a backend technology in a web development stack, while JavaScript, jQuery (and other derivative technologies, such as Ajax) are for the frontend. If you are hands-on with JavaScript, why not go with Node.js? Node.js[^] If you are...

A Quick Startup using .NET Core on Linux

14 Sep 2016 by Afzaal Ahmad Zeeshan

A comprehensive guide to .NET Core for beginners

Real-time Emotion Detection with Azure Cognitive Services

15 Apr 2019 by Afzaal Ahmad Zeeshan

Integrate Cognitive Services SDKs in .NET Core based app

machine-learning

Kickstart with .NET Core and MongoDB - Console App

19 Jan 2017 by AHMAD ANAS

In this article, you will learn how to create console application in .NET Core with NoSQL- MongoDB.

Use Windows Forms Designer on .NET Core 3.0 Preview

10 Aug 2019 by Ahmad N. Chatila

A hack tutorial that enables the use of Windows Forms Designer for .NET Core 3.0 (preview) based Windows Forms apps

How to get label text from table reference on database based on tablename and fieldname

26 Dec 2018 by ahmed_sa

problem How to get label text from table reference on database based on TableName and FieldName dynamically from database and show on view createEmployee . Meaning i need to get label text dynamically from database not static from model SO that Every Time i need to change text of label i...

How to use save button to make save in both cases insert and update in create action HTTP post

7 Jan 2019 by ahmed_sa

Problem How to use save button in Create Action to make save in both cases insert and update using repository pattern ? and what changes i will make in view to accept update and insert . what i writing is when make new record or update record then use save button it will save using create...

How to load value of last employeeid + 1 in add action

6 Jan 2019 by ahmed_sa

I have controller name emp have action add i need when action add view loaded display last value increased by one in employeeid textbox meaning suppose i have in datbase employeeid 1 then when action add view loaded employeeid must have 2 so that how to do that please ? in action what i write ...

entity-framework

When display next record in create action I get error nullreferenceexception: object reference not set to an instance of an object

7 Jan 2019 by ahmed_sa

Problem When display next record of EmployeeId i get error on line below : Next NullReferenceException: Object reference not set to an instance of an...

entity-framework

When convert var nextid to integer get error how to solve error

7 Jan 2019 by ahmed_sa

when try to convert nextid to integer to assign to employeeid i get error as below System.InvalidCastException: 'Unable to cast object of type 'Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable`1[System.Int32]' to type 'System.IConvertible'.' employee id is integer and error show on...

entity-framework

How to get model property of employee as employeename, branch from result variable in controller

9 Jan 2019 by ahmed_sa

Problem How to get model property of employee as EmployeeName,BranchCode From Result variable in controller ? I using asp.net core 2.1 visual studio 2017 repository pattern Generic but problem cannot display or show models in EmployeesController if i write result variable it not show...

entity-framework

When run angular with webapi ASP.NET core project get error

12 Feb 2023 by ahmed_sa

I have application work in asp.net core 2.1 visual studio 2017 work with angular but when run page it show empty page i make inspect inside web page i get error as below Uncaught Error: inject() must be called from an injection context at injectInjectorOnly (core.js:1188) at inject...

Are data annotation allow to define compost key per model ?

18 Jan 2019 by ahmed_sa

Problem i work on asp.net core 2.1 visual studio 2017 code first with repository pattern when do create database i do as following Add-Migration InitialCreate but i got error Entity type 'Employee' has composite primary key defined with data annotations. To set composite primary key, use...

entity-framework

How to implement repository pattern in ASP.NET core 2.1

16 Jan 2019 by ahmed_sa

Problem How to implement repository pattern in asp.net core 2.1 visual studio 2017 with SQL server 2012 ? i work on project work on repository pattern but i cannot implement it 1- How to define repository on controller Employee to call function GetAll on constructor? meaning how to...

entity-framework

Which model will select to be base of view sales order entry form ( salesfooter model or sales header model) ?

17 Jan 2019 by ahmed_sa

I work in project work in asp.net core 2.1 visual studio 2017 SQL Server 2012 I actually need to make entry form Sales Order consist from Sales Header Model and Sales Footer model on Sales Order Entry Form on Header(represent by Sales Header Model) SalesOrderNO 1 SalesYear 2019...

entity-framework

How to insert sales order data under create action on sales order controller

20 Jan 2019 by ahmed_sa

How to save sales order meaning How to insert data of sales order on Tables Sales Header and Sales Footer to save order Actually what i need is what i write under Create Action Result on sales ordercontroller to save order my create view of sales order as following View Of Create Action...

entity-framework

Error in save data when click on create button to save footer

20 Jan 2019 by ahmed_sa

Problem when save data from controller when click create button to save i get error An unhandled exception occurred while processing the request. NullReferenceException: Object reference not set to an instance of an object. WebTabCore.Controllers.SalesOrderController.Create(SalesHeader sh) in...

entity-framework

How to pass data from view to controller by ajax request as input parameters to controller action method

21 Feb 2019 by ahmed_sa

Problem cannot pass data from view to controller by ajax request as input parameters to controller action method I have class model name SalesHeader as following public class SalesHeader { public int SalesOrderNo { get; set; } public int SalesYear { get; set; } ...

entity-framework

Orderitems variables store only last record from list although I have more record

21 Jan 2019 by ahmed_sa

Problem orderItems list store only last record and ignore another rows problem when click save button why ? meaning saleslino quantity 1 2 2 6 3 9 it must store all in list but actually it store wrong it store last record only meaning it store 3 and its...

entity-framework

When call get all repository pattern I dont found singleordefaultasync compile error

25 Jan 2019 by ahmed_sa

Problem When Call get all repository pattern i dont found singleordefaultasync compile error . error details Ienumerable doesn't contain definition for singleordefaultasync and no accessible extension method singleordefaultasync accepting first argument of type ienumerable...

entity-framework

How to show max based on employeeid, branchcode)

25 Jan 2019 by ahmed_sa

Problem How to get max value based on composite key branchCode,EmployeeId i work on asp.net core 2.1 visual studio 2017 How to get max number per branch code not for all branches ? repository interface public interface IrepositoryTab where T : class { IEnumerable...

entity-framework

When call getbyid method I get error composite key when click first button on create view on ASP.NET core 2.1

27 Jan 2019 by ahmed_sa

How to solve this Error and why this happen ? An unhandled exception occurred while processing the request. ArgumentException: Entity type 'Employee' is defined with a 2-part composite key, but 1 values were passed to the 'DbSet.Find' method....

entity-framework

How to check id exist or not generic repository pattern ASP.NET core 2.1

8 Feb 2019 by ahmed_sa

Problem How to check id exist or not generic repository pattern asp.net core 2.1 ? because i have more than 10 controllers so that i need to write function check if id on table exist or not . like that if (!EmployeeExists(emp.EmployeeId)) { ...

entity-framework

How to bind sales header model to collection of sales line using ASP.NET core 2.1 ?

3 Apr 2019 by ahmed_sa

Problem How to bind sales header Model to collection of sales Line using asp.net core 2.1 ? I work on project have Sales Order form this form contain to salesHeader salesFooter so that i already have model Sales Header have navigation property to Sales Footer as following SalesHeader Model ...

entity-framework

How to use dynamic datatype on more than one key getbyid repository pattern

9 Feb 2019 by ahmed_sa

problem How to use dynamic datatype on more than one key GetByID repository pattern ? public T GetById(int Id) { return dbSet.Find(Id); } and in interface Igenerics T GetById(int Id) actually i need T GetById(int Id,key2,key3,...etc) What I have tried: How...

When using edit action result to save get error object reference is null

14 Feb 2019 by ahmed_sa

problem i get error on edit action result when save data using asp.net core 2.1 ? error on line foreach (var Footer in Header.SalesFooters) on sales footer is null why and how to solve error ? System.NullReferenceException HResult=0x80004003 Message=Object reference not set to an instance...

Cannot apply index with [ ] to an expression of type icollection MVC view ASP.NET core 2.1

14 Feb 2019 by ahmed_sa

problem cannot apply index with [ ] to an expression of type Icollection mvc view asp.net core 2.1 public class SalesHeader { public SalesHeader() { } public int SalesYear { get; set; } public int BranchCode { get; set; } public...

entity-framework

Are project MVC must be web api to connect to angular ?

14 Feb 2019 by ahmed_sa

Problem I work on asp.net core 2.1 project with sql server 2014 this project is mvc controller not web api . we decide to make client side with angular 7 so that i will have two project project have angular client side another project is asp.net core mvc or web api server side . so that...

How to get last record+1 when create new employee on web API project ?

16 Feb 2019 by ahmed_sa

Problem How to represent create new employee record by web API ? i work on project asp.net core 2.1 i create mvc controller employee controller and inside it i make create action result for create new employee view . Create function with get type and show last record exist on database plus...

entity-framework