How to keep username through whole C# application

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I am writing code n MVVM model. Each laser is separate project, but ALL of them Are Within one Solution. Ta the bggining user have to login. Later on, I have to record user name into SQL Table, but I don’t want that user have to write IT manually again, but to use username which was entered during login proces.
Does anybody can help.

What I have tried:

I tried to make poblc string varijable in UI Layer, but the Logic for recording Data is in Model layer, which doesn’t have reference to UI layer, but oposite.

Thank you for your assistance.

Posted 20-Jun-19 11:18am

Sinisa Janjetovic

Updated 27-Jun-19 4:07am

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BillWoodruff 21-Jun-19 2:27am

WPF ? or ?

Sinisa Janjetovic 21-Jun-19 2:51am

WPF

3 solutions

Solution 2

Or,

App.Current.Properties["Username"] = "Someone";

See: [^]

Posted 20-Jun-19 22:00pm

BillWoodruff

Comments

Sinisa Janjetovic 21-Jun-19 4:02am

In which file should I put this line?

BillWoodruff 21-Jun-19 5:01am

try MainWindow.xaml.cs ... or, the same place you put the static class.

you'll need to cast to get the stored object back to a string:

string uname = (string) App.Current.Properties["Username"];

Sinisa Janjetovic 21-Jun-19 5:01am

thnx

Sinisa Janjetovic 21-Jun-19 5:10am

Sorry, I didn't manage.
Neither with first answer, neither with your. Probably I don't know how to do that

BillWoodruff 22-Jun-19 1:46am

When you created your project: what version of Visual Studio are you using ? What version of .NET FrameWork ? The name of the Project Type ?

Sinisa Janjetovic 22-Jun-19 3:18am

Visual Studio 2017, .NET 4.7, I have 3 projects in one solution, MVVM model

BillWoodruff 22-Jun-19 4:23am

I;m going to stop responding because ... not having worked with WPF for years ... I don't think I can help you further. And, I have used App.Current.Settings in the past without problems.

To get a more useful response, I suggest you edit your post to describe in detail the structure of your app:

For each of those three projects describe the name of the project type you selected when you created it; which one is the App ?

good luck, Bill

Sinisa Janjetovic 22-Jun-19 4:30am

Thank you for your kindness and good will to help me

BillWoodruff 22-Jun-19 4:44am

No problem: while you can hard-code globals in xaml like this: https://stackoverflow.com/a/27595156/133321

my guess is that's not what you need.

Solution 3

(1)from login page:
declare --> public static string username="";

(2)inside a function to get access to next page
assign username=whatever the textBox.Text

(3)in any all the pages that you want to use username
assign it to the variable that you have declared ...eg string name=login.username;

Hope it will solve your probles

Posted 27-Jun-19 4:07am

Member 14511434

Comments

Maciej Los 28-Jun-19 2:51am

This is not a WWW (ASP.NET) project!

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Maciej Los · Accepted Answer · 2019-06-20T21:45:00

Solution 1

Add static class and make it public, for example:

C#

public static class MyDataHelper
{
    public static string username {get; set;}
   //other members, fields, methods
}

Now, you're able to use it in entire project.

Usage:

C#

//write
MyDataHelper.username = "Maciej";
//read
Console.WriteLine(MyDataHelper.username);

Posted 20-Jun-19 21:45pm

Maciej Los

Updated 20-Jun-19 23:43pm

v3

Comments

Sinisa Janjetovic 21-Jun-19 5:15am

"Cannot declare instance members" in a static class is error message which I get by using this code

Maciej Los 21-Jun-19 5:21am

Instance member? What are you trying to do?

Sinisa Janjetovic 21-Jun-19 5:22am

I just created new class library and copied your code, just changed the name of it and variable name

Sinisa Janjetovic 21-Jun-19 5:31am

namespace PomocniParametri
{
public static class PomocniParametri
{
public static string KorisnikAplikacije { get; set; }
//other members, fields, methods
}
}

This is proper, it seems

Maciej Los 21-Jun-19 5:40am

It looks good. I forgot to add "static" word within "username" variable.

Sinisa Janjetovic 21-Jun-19 5:41am

No problem, thank you for your help, anyway

Maciej Los 21-Jun-19 5:43am

You're very welcome. Please, check updated answer.

Sinisa Janjetovic 21-Jun-19 5:49am

Ok, I did, thank you.