C# Discussion Boards - CodeProject

OriginalGriff24-Dec-22 4:06

24-Dec-22 4:06

That's a difficult one ... there are probably millions of tasks that you could have been assigned, and we have no idea at all what it might be!

So we're going to have to guess: the message elements are flexed through a collectimizer which strips the flow-gate arrays into virtual message elements.[^]
Hope that helps!

If it doesn't, then start here: Asking questions is a skill[^] and think about what you need to know, and what you need to tell us in order to get help.

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!

BillWoodruff24-Dec-22 18:39

24-Dec-22 18:39

perhaps the OP thinks this is a psychic hotline ? OMG | :OMG:

«The mind is not a vessel to be filled but a fire to be kindled» Plutarch

OriginalGriff24-Dec-22 19:44

24-Dec-22 19:44

He will meet a tall, dark stranger and should avoid elevators and shellfish until Tuesday ...

RedDk25-Dec-22 6:30

RedDk

25-Dec-22 6:30

Well, first you've gotta wait for the keyboard to do it's magic (press any key). Then when the log-in screen appears out from behind the screen saver, you've gotta stand up. Now move your head as close to perpendicular to the lit screen and, looking down onto it's surface, identify where the spots of spagetti sauce are most concentrated. Notice that the most crusty of these clusters of dinner spatter might be well congealed and therefore hard to wipe off with cold water (test run a "scrape" using a fingernail). Get a cloth rag then, soaked with HOT water, and lightly, from this high advantage point above the frame of the monitor, in a bak-and-forth manner, rub the sauce from the darker backlit spots until they have been removed. After, dry with a paper towel. And you're good to go.

OriginalGriff25-Dec-22 21:44

25-Dec-22 21:44

When I started reading that, I assumed it was going to end with "tell them 'I am too damn stupid to own a computer'" Big Grin | :-D

Nitin S26-Dec-22 18:10

Nitin S

26-Dec-22 18:10

and you will tell details about the task with telepathy or what?

what you have tried before asking for help

=====================================================
The grass is always greener on the other side of the fence

convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

RedDk27-Dec-22 8:54

RedDk

27-Dec-22 8:54

HOLY CROW! A terabyte of memory! That's a lot!

Sakhalean23-Dec-22 23:48

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

23-Dec-22 23:48

Hi All,

convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

Please help

OriginalGriff24-Dec-22 0:29

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

24-Dec-22 0:29

While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.

So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.

If you are having problems getting started at all, then this may help: How to Write Code to Solve a Problem, A Beginner's Guide[^]

Sakhalean25-Dec-22 4:52

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

25-Dec-22 4:52

Sorry,

I googled nothing helped me. So I have created my own class for number conversions.
I have 17+ years of software development experience.

Thanks you so much for your help.

BillWoodruff24-Dec-22 18:37

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

24-Dec-22 18:37

study these: [^] [^] ... and ask yourself what numeric types it makes sense to convert the values you describe ... to.

then study this: [^]

and ... start experimenting !

come back with specific questions.

«The mind is not a vessel to be filled but a fire to be kindled» Plutarch

Sakhalean24-Dec-22 22:46

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

24-Dec-22 22:46

Thank you so much.

Any have created my own class for converting any base to any base including decimal places (Ex:20.1234).

Will share it.

trønderen24-Dec-22 23:13

trønderen

24-Dec-22 23:13

BillWoodruff wrote:
ask yourself what numeric types it makes sense to convert the values you describe

Why wouldn't it make sense? If b >= 10, you obviously have to define 'digits' for 10+; using A-Z for 10-36 is quite common. Equally obvious: The result of conversion must be treated as a digit string; there is no other way to handle, say, a base 13 number in a binary computer.

In decimal, the digits to the left of the decimal point give the number of ones, then number of tens, then ten**2s, ten**3s, ten**4s, ... To the right of the decimal point digits give the number of 1/10s, then the number of 1/(10**2)s, 1/(10**3)s, 1/(10**4)s, ...

For base b, the digits to the left of the point give the number of ones, then number of bs, then b**2s, b**3s, b**4s, ... To the right of the point, digits give the number of 1/bs, then the number of 1/(b**2)s, 1/(b**3)s, 1/(b**4)s, ...

I guess it would be somewhat confusing to call it a decimal point, though.

"Octal is just like decimal ... if you are missing two fingers" (Tom Lehrer)

To the OP: I would have split the number on the point, treating the whole and the fractional parts separately, converting then to binary integers, and then iterated each over a divide/remainder down to zero. Note that for the fractional part, you must set a reasonable limit for the number of digits - in, say, base 13 you cannot represent 879/1000 (that is from your first example) as any finite series of fractional digits f1/13 + f2/169 + f3/2197 + ... + fn/(13**n), except for a few special cases. (That goes for decimal .879 or .345 as well; they are not represented by those exact values in double format.)

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

BillWoodruff25-Dec-22 4:15

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

25-Dec-22 4:15

to the flow of such off-topic ramblings, one can only hope the kaopectate of silence will ... help.

«The mind is not a vessel to be filled but a fire to be kindled» Plutarch

modified 25-Dec-22 11:06am.

Sakhalean25-Dec-22 4:50

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

25-Dec-22 4:50

Thank you all.

I have created my own class for number conversion from one base to another base including decimal places.
Will share it if any body wants it.

I am GouseSakhalean, having 17 years of software development experience.

BillWoodruff25-Dec-22 5:13

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

25-Dec-22 5:13

Namaskara, "17 years in software development"

Then, surely, you are aware that a deep understanding of numeric types in a strongly-typed language, like C#, is essential to competence. In C#, understanding when you can cast, and when you must invoke a conversion method is essential.

"rahi gulzar to phool khilenge" Kabir

«The mind is not a vessel to be filled but a fire to be kindled» Plutarch

trønderen25-Dec-22 11:17

trønderen

25-Dec-22 11:17

Sakhalean wrote:
I am GouseSakhalean, having 17 years of software development experience.

OK, but then I am surprised that you ask for help with this problem. I consider it to be quite trivial, like an exercise you would be given early in your studies.

Furthermore, I can see no practical use for it - except to make a student really look into floating point formats, and to understand the concept of an arbitrary base. In which application do you need to express a double in an arbitrary base?

So both the problem and your questioning made it look like some student asking for help to do his homework assignment. I am getting curious to know which real world application (rather than a student exercise) has a need for the conversion function you have described.

Re: convert double with decimal places to any base in C# example : 19.879 to any base or -19.345 to any base

Sakhalean25-Dec-22 14:06

EF Core 6 Repository Pattern

25-Dec-22 14:06

This is for Aerospcase domain project purpose. For Aircraft project where we need for Aircraft parameters to be converted into Deciamal, Octal, hex , binary and engineerig formats.

Kevin Marois23-Dec-22 9:11

Kevin Marois

23-Dec-22 9:11

I have an old Linq-To-Sql DAL that I'm converting to a EF Core 6. I'm using the Repostory pattern.

I've looked at this article and others like it, and the all seem to do it the same way...

Interface

public interface IRepository<T> where T : class
{
    void Add(T entity);
    void AddRange(IEnumerable<T> entities);
    void Delete(T entity);
    void DeleteRange(IEnumerable<T> entities);
    T Get(int id);
    IEnumerable<T> Get(Expression<Func<T, bool>> expression);
    IEnumerable<T> GetAll();
}

Base Repository

public class BaseRepository<T> : IRepository<T> where T : class
{
    protected readonly DbContext _context;

    public BaseRepository(DbContext context)
    {
        _context = context;
    }

    // Interface methods here
}

Customer Repository

public class CustomerRepository : BaseRepository<CustomerEntity>, ICustomerRepository
{
    public CustomerRepository(DbContext context)
        :base(context)
    {
    }

    public bool IsCustomerActive(int id)
    {
        return true;
    }
}

Usage

public class CustomerController : ControllerBase
{
    public bool CheckIfCustomerIsActive(int id)
    {
        var connString = "";

        var dc = new SqlDataContext(connString);

        ICustomerRepository repository = new CustomerRepository(dc);

        return repository.IsCustomerActive(id);
    }
}

Issues I See
Everything about this seems clean and maintainable, except
1. The Connnection String is in the controller. I see this in a lot of examples.
2. By design, the controller must create and pass the data context to the repos.

It seems to me that these 2 issues create a tight coupling between the API and the DAL.Why would a controller ever need to know the conn string OR DBContext? Those are both specific to the DAL.

Why not do this instead?

public class BaseRepository<T> : IRepository<T> where T : class
{
    protected readonly DbContext _context;

    public BaseRepository()
    {
        // The base repo is the only place that gets the connection string
        var connString = Properties.Settings.Default.ConnectionString;

        // The base repo is the only place that knows about the db context
        _context = new SqlDataContext(connString);
    }

    // Interface methods here
}

Doing it this way, the controllers could use DI to get the repos they need, and the controllers never need to know about the connection string or the DBContext. I could swap out the entire data layer without ever opening a controller.

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

modified 23-Dec-22 15:29pm.

Richard Deeming5-Jan-23 0:02

Richard Deeming

5-Jan-23 0:02

Are you using Dependency Injection? Ideally, the DbContext and repository classes should be registered as "scoped" dependencies. The context would be injected into the repository, and the repository would be injected into the controller.

The connection string would usually be read from the web.config / appSettings.json file by convention:
Connection strings and models - EF6 | Microsoft Learn[^]

If you need to manage the connection string differently, then you should be able to add it to the DI registration. For example, using the Microsoft DI framework:

services.AddScoped<DbContext>(_ =>
{
    string connString = Properties.Settings.Default.ConnectionString;
    return new SqlDataContext(connString);
});

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Kevin Marois5-Jan-23 6:46

Kevin Marois

5-Jan-23 6:46

Richard Deeming wrote:
Are you using Dependency Injection? Ideally, the DbContext and repository classes should be registered as "scoped" dependencies. The context would be injected into the repository, and the repository would be injected into the controller.

Yes, that's exactly what I was thinking. Many of the examples you find out there show the DbContext referenced in the controller.

Richard Deeming wrote:
f you need to manage the connection string differently,

It seems to me that the ConnectionString belongs in the Repository project. The Controller get the repo, and the repo knows how to contact the DB.

Thanks

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.

Richard Deeming5-Jan-23 22:41

Richard Deeming

5-Jan-23 22:41

Kevin Marois wrote:
It seems to me that the ConnectionString belongs in the Repository project.

The connection string shouldn't be hard-coded anywhere. It belongs in the configuration settings of the application - in this case, the web site.

For .NET Framework, that would usually be the <connectionStrings> section of the web.config or YourApp.exe.config file.

For .NET Core/5/6/7/..., that usually would be the "ConnectionStrings" section of the appSettings.json file, although you could use any custom section you want. The .NET configuration system is much more flexible, so you could also choose to store the connection string in any of the configuration sources your application uses - environment variables, Azure secrets, etc.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Kevin Marois6-Jan-23 5:38

Kevin Marois

6-Jan-23 5:38

Richard Deeming wrote:
The connection string shouldn't be hard-coded anywhere. It belongs in the configuration settings of the application - in this case, the web site.

I never said hard coded. I said it belongs in the Repository project, in the app.config for THAT project. Why would the web site nedd to know it? As far as the web site knows, it simply gets a repo injected into it. The Repo gets the connstring from its app.config.

This was my question all along. I don't get why the controller knows anything about the DB.

If it's not broken, fix it until it is.
Everything makes sense in someone's mind.
Ya can't fix stupid.