I following this answer
My auto generated file has this code for dbContext:
public partial class TrafficEngineEntities : DbContext
{
public TrafficEngineEntities()
: base("name=TrafficEngineEntities")
{
}
I can modify the file to add the additional method with the string parameter:
public partial class TrafficEngineEntities : DbContext
{
public TrafficEngineEntities()
: base("name=TrafficEngineEntities")
{
}
public TrafficEngineEntities(string connectionString)
: base("name=TrafficEngineEntities")
{
}
But if I try only write the part to add the additional method in a separated file (to avoid overwrite in case updates), then visual studio said my db tables class aren't part of the dbcontext, like I overwrite everything in the partial class.
public partial class TrafficEngineEntities : DbContext
{
public TrafficEngineEntities(string connectionString)
: base("name=TrafficEngineEntities")
{
}
}
The problem here is that your manually created TrafficEngineEntities partial class and auto generated TrafficEngineEntities are in different namespaces. So, in fact these are 2 different classes.
Typically, you have namespaces in your solution in align with your solution folders. Auto generated files may not respect this convention or you may accidentally create your manually created partial class in the different folder.
Make your manual class namespace same as in auto generated class and it should solve the problem.
You may suffix your files like TrafficEngineEntities.AutoGenerated.cs and TrafficEngineEntities.Patrial.cs so, you can clear see the difference between auto generated and manually edited files.
Related
I am having a problem with Visual Studio 2015 and Framework 4.6.1.
I have a business layer with this namespace: BusinessLayer.LocalStorage. In this class (named LocalStorage) I have this function:
...
public static void XXX()
{
}
...
In the main project with the same Framework 4.6.1, I have in one Winform
using BusinessLayer.LocalStorage;
In the Load I wrote the function but the reference is not recognized:
I have to add LocalStorage before:
LocalStorage.LocalStorage.XXX();
This way the call is working
why is not working using LocalStorage.XXX()? I declared my namespace in the using clausules.. Then should be working.
I have the class in a directory inside BusinessLayer project for this reason namespace should be BusinessLayer.LocalStorage
Code is:
namespace BusinessLayer.LocalStorage
{
public class LocalStorage
{
...
public static void XXX()
{
}
...
}
}
This is because LocalStorage is ambiguous, it could either be namespace LocalStorage or the class LocalStorage. You can solve this in 3 ways:
Remove the namespace LocalStorage entirely and move everything in it inside the BusinessLayer namespace
Rename the class LocalStorage to something else
Add using LocalStorage = BusinessLayer.LocalStorage.LocalStorage to the top of your file where you need to use the class LocalStorage
Edit: Option 4. If you desperately want to keep the directory structure as it is right now (with a LocalStorage directory), you can alternatively tell Visual Studio that the directory LocalStorage is not a namespace provider. You can do this by editing the properties of the folder in the Solution Explorer
Visual studio automatically generates Namespaces based on the current location of a class within a solution. When you create a new class it first takes the name of the project. Then it takes the current folder the class is located in. it will continue appending the folder name to the namespace until it reaches the class name itself.
So for example, if you have a project called ExampleProject, with a folder called Models, with a class inside called BaseModel.cs, the resulting namespace would be ExampleProject.Models
Make sure the namespace containing XXX is not LocalStorage.LocalStorage and is called BusinessLayer.LocalStorage. You can change this namespace to whatever you want and rebuild your project.
Although the namespace structure and object names are not recommended to be the same, which will lead to errors in many cases, I see that you want to use it this way from the comments you made.
I don't recommend you to name a class like its namespace, see this article
I would recommend would be <XYZ>LocalStorage.cs
I don't know your layer structure, but you can call it LocalStorage.XXX () with a structure like the one below.
BusinessLayer structure:
LocalStorage Class:
namespace BusinessLayer.LocalStorage
{
public class LocalStorage
{
public static void XXX()
{
}
}
}
And finally, after referencing BusinessLayer to winForm, you can call it in Load method as follows.
using System;
using BusinessLayer.LocalStorage;
using System.Windows.Forms;
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
LocalStorage.XXX();
}
}
}
Or, if you don't want a folder in your BusinessLayer structure, you can use it using the same namespace (namespace BusinessLayer.LocalStorage) as below.
I'm trying to write a utility class that writes email messages as part of my web service.
I have it in my project's App_Code folder:
namespace OrtundService.Controllers
{
public class ServiceMail
{
}
}
This class just basically gets model data from the controller that's calling it and uses that data to generate an email which I then send to the email address contained in the model record.
For reasons beyond my comprehension, though, I can't access this in the following controller:
namespace OrtundService.Controllers
{
public class UsersController : ApiController
{
}
}
It's clear the 2 classes are peers in the same namespace, so why wouldn't the UsersController class be able to see the ServiceMail class?
For clarity on the matter, I have established that the ServiceMail class can see the UsersController class.
move the class out of app_code to it's own folder in your project.
I'm using a public LoginContext class to manage user logins in my web app.
Unfortunately, even though I have the LoginContext class declared publicly, my partial class Login at Login.aspx.cs can't seem to access it.
My code is as follows:
// ~/App_Code/LoginContext.cs
namespace stman
{
public class LoginContext
{
}
}
// ~/Login.aspx.cs
namespace stman
{
public partial class Login : System.Web.UI.Page
{
protected void btnLogin_Click(object sender, EventArgs e)
{
LoginContext log = new LoginContext(); // error is here
}
}
}
The error that comes up on the line where I instantiate LoginContext reads as follows:
The type or namespace name 'LoginContext' could not be found (are you missing a using directive or an assembly reference?)
When I try to generate a new class for LoginContext, it goes into the web app's root folder where it can no longer access the public Database class that I need in LoginContext.
I have no idea what's causing all of these problems, but based on what I've learned over the last 18 months doing this professionally, they shouldn't exist right now...
Can anyone help clear things up here? Specifically I'd like to know:
What I'm doing wrong
Why it's wrong
Who can I fix it?
Thanks in advance!
EDIT
I've had a look and it seems neither the Database class in ~/App_Code/Database.cs or the LoginContext class in ~/App_Code/LoginContext.cs are accessible to the page - or any page in the website.
In LoginContext.cs properties, marked it as BuildAction = Compile.
You can achieve this behaviour when these classes are located in different projects.
If this is true then you should use full path to the class starting from the project name
ProjectName.stman.LoginContext
try using constructor
namespace stman
{
// Database is a class that handles the sql queries and such
public class LoginContext : Database
{
public LoginContext () : base("Name=LoginContext")
{
}
}
}
From what I read from the App_Code behavior may be different in web site projects and web application. I wonder what kind of project you're working on? One possible solution would be to make this project in web application project, this Link can help you to make this project:
Source
I have created a widows application with setup project. I compiled and build.Everything looks fine.
For changing the configuration file during installation am trying to add a new Installer file. when i add it by default i get the below code
Collapse | Copy Code
[RunInstaller(true)]
public partial class Installer : Installer
{
public Installer()
{
InitializeComponent();
}
}
When i compile this Am gettin
Circular base class dependency involving 'windows_setup.Installer' and 'windows_setup.Installer'
windows setup is the name space i used for the application. Then i found that i need to create the new classs which inbherits Installer.So i changed my class name to
public partial class MyInstaller : Installer
Now am Getting
Inconsistent accessibility: base class 'windows_setup.Installer' is less accessible than class 'windows_setup.MyInstaller'
Suggest your ideas.
Thanks
Well, you can't have a public class inheriting from an internal class for example. Try to set everything as internal if not required outside, or public otherwise.
Either change class Installer and MyInstaller to public.
Write Something like this:
System.Configuration.Install.Installer and class definition should be public partial
[RunInstaller(true)]
public partial class MyInstaller : System.Configuration.Install.Installer
{
public MyInstaller()
{
InitializeComponent();
}
}
I have a generic abstract UserControl class, SensorControl, which I want all my sensor control panels to inherit from.
The problem
When attempting to design the EthernetSensorControl (one of my inherited UserControl forms, from within Visual Studio, the following error is displayed in the form designer:
The designer could not be shown for this file because none of the classes within it can be designed. The designer inspected the following classes in the file: DeviceSensorControl --- The base class 'Engine.Sensors.SensorControl' could not be loaded. Ensure the assembly has been referenced and that all projects have been built.
SensorControl class:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace Engine.Sensors
{
public abstract class SensorControl<SensorType>
: UserControl where SensorType : class
{
protected SensorType _sensor;
public SensorControl(SensorType sensor)
{
_sensor = sensor;
}
}
}
Example inherited class, EthernetSensorControl:
namespace Engine.Sensors
{
public partial class EthernetSensorControl
: SensorControl<EthernetSensor>
{
public EthernetSensorControl(EthernetSensor sensor)
: base(sensor)
{
}
}
}
And the call stack:
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host)
Everything compiles and I can see the panel displayed, but I can't design it. I think the problem may be related to the partial classes. Any ideas?
You cannot design a control or form that inherits an abstract class.
(The designer needs to instantiate the base class to serve as the design surface)
The base class also needs to have a parameterless constructor for the designer to call.
This constructor can be private.