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QUESTION
I used the database first approach. The model is right (or at least it looks like) But I always get this error. Please, I've already tried so many things.. The full code of my program (and even sql script by which I create my database) is here: https://github.com/AntonioParroni/test-task-for-backend-stack/blob/main/Server/Models/ApplicationContext.cs
Since I have a mac. I created my model with dotnet ef cli commands (dbcontext scaffold) I can use my context. But I can't touch any DbSet..
...ANSWER
Answered 2022-Mar-31 at 09:23You have net6.0
target framework which is still not released while you have installed EF6 which is a previous iteration Entity Framework (mainly used with legacy .NET Framework projects) and you also have EF Core (a modern iteration of it) but older version - 5.0 (which you are actually using for your context, see the using Microsoft.EntityFrameworkCore;
statements there).
Try removing EntityFramework
package and installing preview version of Microsoft.EntityFrameworkCore.SqlServer
(possibly just updating to the latest 5 version also can help) and either removing completely or installing preview version of Microsoft.EntityFrameworkCore.Design
. (Also I would recommend to update your SDK to rc and install rc versions of packages).
Or try removing the reference to EntityFramework
(not Core one) and changing target framework to net5.0
(if you have it installed on your machine).
As for why do you see this exception - I would guess it is related to new methods added to Queryable
in .NET 6 which made one of this checks to fail.
TL;DR
As mentioned in the comments - update EF Core to the corresponding latest version (worked for 5.0 and 3.1) or update to .NET 6.0 and EF Core 6.
QUESTION
In LINQPad, I frequently want to Dump some SQL table, but add a property to each row. I usually default to the simple:
...ANSWER
Answered 2022-Feb-08 at 22:51You can add some extension methods to make this work. I do not recommend adding these to My Extensions
because they require importing System.Dynamic
which you probably don't want for most queries. Put these in another query which imports System.Dynamic
and #load
it when desired.
QUESTION
Recently I upgraded one of my projects to use .NET 6
. Earlier I was using MoreLinq library to use DistinctBy()
to apply it on the specific property.
Now as I upgraded TargetFramework to .NET 6
, this change come up with inbuilt support to DistinctBy()
.
Now the compiler is confused about which DistinctBy()
needs to select, I can't rely on System.Linq
, because the removal of using MoreLinq
will cause multiple other errors.
I know if we face ambiguity between the same methods then we can use using alias
, but I am not sure how to use using alias
for Linq extension methods.
Here is the error:
I am able to replicate the same issue in the below fiddle
...ANSWER
Answered 2021-Nov-10 at 17:46You can't alias an extension method, but you can call the extension like a normal method, using the full namespace. After all, extension methods are really just syntactic sugar. For example (using the same data you provided in your fiddle):
QUESTION
Using an existing .NET 5 MVC Web App, I attempted to upgrade to .NET 6, but encountered this error. I am also using IIS for Windows Authentication--now setup in .NET 6 as "profiles" under Properties -> Debug -> hyperlink (Open debug launch profiles UI). I also included the newer "Microsoft.AspNetCore.Authentication.Negotiate" Nuget package (and associated code) to handle the newer Windows Authentication library.
When the web app launches, I get the following error:
An unhandled exception occurred while processing the request.
InvalidOperationException: Cannot find compilation library location for package 'System.Security.Cryptography.Pkcs'
Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths(ICompilationAssemblyResolver resolver, List assemblies) Microsoft.Extensions.DependencyModel.CompilationLibrary.ResolveReferencePaths() Microsoft.AspNetCore.Mvc.ApplicationParts.AssemblyPartExtensions+<>c.b__0_0(CompilationLibrary library) System.Linq.Enumerable+SelectManySingleSelectorIterator.MoveNext()
...
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
This does NOT go away if I add the package listed: System.Security.Cryptography.Pkcs
...ANSWER
Answered 2022-Jan-05 at 21:36I needed to remove at least 1 Nuget package:
- Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation -- I removed this one second, but it started working after I did.
- Microsoft.Extensions.Hosting -- I removed this one first, but this alone did not fix it. I don't know if this "also" needed to be removed. I assume not, but I'm including, just in case. Removing it did not hurt anything.
Edit: As a WARNING, this will lose the abilities given by Razor.RuntimeCompilation. However, there appears to be a code incompatibility with, I believe, IIS and Razor in .NET 6.
QUESTION
I'm converting an object based on reflection like this.
...ANSWER
Answered 2022-Jan-01 at 18:01I can't think of a solution that's significantly different to yours, fundamentally it feels like it's a custom logic to determine whether a property value is "empty" or not.
Perhaps a pattern matched switch expression might make the code a little cleaner, however, for example:
QUESTION
I'm trying to make a program that opens a browser on each multi-display. When I did it with a notepad, it worked. However, when it's a browser didn't work and showed the error "System.InvalidOperationException: Process must exit before requested information can be determined". I will appreciate your help with this situation.
This is my code:
...ANSWER
Answered 2021-Dec-27 at 10:37It seems that msedge.exe
use a host process to start different tabs, so we can't use the created process ID to handle it.
Compare created process ID with processes in the Task Manager, the
process 38756
is missing.
Another tool to browse edge
relative processes is the built-in task manager of edge
.
We can't find process 38756
as well.
So re-search the target edge
process is necessary.
This repo https://github.com/alex-tomin/Tomin.Tools.KioskMode demostrate how to move chrome window into different monitors and set as full screen.
I tried to extract the necessary and modify your code like below, hope it helps:
QUESTION
I want to dynamically build a LINQ query so I can do something like
...ANSWER
Answered 2021-Dec-20 at 15:27Do you need to create an expression and compile it? Unless I'm missing some nuance to this, all you need is a function that returns a Func
.
QUESTION
Well, I was doing a DDD project, specifically using redis, but I don't think that has anything to do with it.
The problem is, the swagger doesn't appear to me, it fails, but when I make requests in postman it works normally.
Thats the error:
...ANSWER
Answered 2021-Dec-15 at 15:11In my case, it was the SDK not running the proper net6.0 version.
While the whole project was using new net6.0 NuGet packages, the local SDK on that one machine I was working on was still net5.0. After installing .net6.0, Swashbuckle 6.2.3 was working again, and all was as expected.
QUESTION
When publishing an ASP.NET Core 6 web application with C# 10's enabled to an Azure App Service from a Visual Studio 2022 publishing profile, the publishing build fails due to missing
using
statements.
C# 10 introduces the new implicit usings feature, where certain using
directives are treated as global using
directives based on the SDK. This can be enabled with the following csproj
configuration:
ANSWER
Answered 2021-Nov-10 at 22:58First of all, it appears that this was a false alarm. I apparently neglected to finish rebooting my workstation after installing the release version of Visual Studio 2022. After restarting, I am now able to publish with full support for implicit usings. Whoops.
That said, this does provide a good opportunity to offer some insight into what I discovered after the fact, which may help future readers with similar types of issues—and certainly helped me better understand the integration between the various command-line tools.
Command-Line ArgumentsNotably, there doesn't appear to be any command-line parameters for handling implicit usings built into any of the following tools:
- .NET 6.0 SDK (
dotnet.exe
) - Visual C# compiler (
csc.exe
) - Microsoft Build Engine (
msbuild.exe
)
Instead, this is handled via the Microsoft Build Engine (msbuild.exe
) when working off of a C# project file (*.csproj
), at which point it generates the following intermediate file at:
QUESTION
Here's code that works, but is there a LINQ way to turn 2 line items into N based on quantity?
...ANSWER
Answered 2021-Nov-18 at 17:16You can use a combination of SelectMany()
and Enumerable.Repeat()
to achieve what you want here. For example:
var list2 = list.SelectMany(x => Enumerable.Repeat(x, x.Quantity));
SelectMany()
selects an element from each elementx
of the input. If any of these elements are sequences themselves, they are all flattened out into a single sequence (rather than say ending up with a list of lists)Enumerable.Repeat()
creates a new enumerable based on each item, containing itemx
repeatedx.Quantity
times.
Full listing as tested on .NetFiddle: https://dotnetfiddle.net/wpOafs
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