https://github.com/aminul-islam-niloy/next-vpn-
Virtual Private Network Application using WPF and c-sharp
https://github.com/aminul-islam-niloy/next-vpn-
Last synced: 4 months ago
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Virtual Private Network Application using WPF and c-sharp
- Host: GitHub
- URL: https://github.com/aminul-islam-niloy/next-vpn-
- Owner: aminul-islam-niloy
- Created: 2023-11-18T19:37:51.000Z (over 1 year ago)
- Default Branch: master
- Last Pushed: 2023-12-02T19:42:31.000Z (over 1 year ago)
- Last Synced: 2025-01-12T15:46:24.228Z (5 months ago)
- Language: C#
- Size: 22.5 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Security: security_guard_shield_icon_153085.ico
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README
# NEXT VPN
`` ObservableObject``
`ObservableObject class implements the INotifyPropertyChanged interface,
which is commonly used in the MVVM pattern to notify subscribers when a
property changes.`
`ObservableObject` is a base class that implements the `INotifyPropertyChanged` interface. It is commonly used in the MVVM (Model-View-ViewModel) pattern to notify subscribers when a property changes.
## Key Features
1. **INotifyPropertyChanged Interface:**
- `ObservableObject` implements the `INotifyPropertyChanged` interface, which provides a standard mechanism for objects to notify subscribers that one of their properties has changed.
2. **PropertyChanged Event:**
- The class declares a non-nullable `PropertyChanged` event of type `PropertyChangedEventHandler`. This event is raised when a property changes.
3. **OnPropertyChanged Method:**
- The `OnPropertyChanged` method is used to raise the `PropertyChanged` event. It takes the property name as a parameter (automatically filled using the `CallerMemberName` attribute).
## Usage
```csharp
// Example usage of ObservableObject
class YourViewModel : ObservableObject
{
private string _Property;
public string Property
{
get { return _Property; }
set
{
if (_Property != value)
{
_Property = value;
OnPropertyChanged();
// Notify subscribers that the property has changed
}
}
}
}
```
# RelayCommand
`RelayCommand` is a commonly used implementation of the ICommand interface in WPF (Windows Presentation Foundation) and other XAML-based frameworks. It is used to represent an action that can be executed and provides a way to determine if the action can be executed.
## Key Components and Concepts
1. **ICommand Interface:**
- `RelayCommand` implements the `ICommand` interface, which defines methods (`CanExecute` and `Execute`) that represent actions that can be executed by a command.
2. **Action and Func:**
- `Action` is a delegate that represents a method that takes a single parameter of type `object` and does not return a value. It's used for the action that should be executed when the command is triggered.
- `Func` is a delegate that represents a method that takes a single parameter of type `object` and returns a boolean. It's used to determine whether the command can be executed.
3. **Events:**
- `CanExecuteChanged` is an event that is raised when the result of the `CanExecute` method changes. It is part of the ICommand interface and is used to notify the system that the ability to execute the command has changed.
4. **CommandManager.RequerySuggested:**
- The `RequerySuggested` event is part of the `CommandManager` class in WPF. It is a global event that suggests that the command manager should query the commands to check whether they can be executed.
5. **Constructor:**
- The constructor of `RelayCommand` takes two parameters: `Action execute` (the action to be executed) and `Func canExecute` (a function to determine if the action can be executed). The `canExecute` parameter has a default value of `null`, meaning the command can always be executed if this parameter is not provided.
6. **Execute Method:**
- The `Execute` method is called when the command is triggered. It, in turn, calls the provided `execute` action.
7. **CanExecute Method:**
- The `CanExecute` method is used to determine whether the command can be executed. It checks whether the provided `canExecute` function is `null` or evaluates to `true` for the given parameter.
8. **Event Subscription:**
- The `CanExecuteChanged` event is subscribed to the `CommandManager.RequerySuggested` event. This ensures that the `CanExecuteChanged` event is raised when the system suggests that the command manager should reevaluate the ability to execute commands.
## Usage
```csharp
// Example usage of RelayCommand
var myCommand = new RelayCommand(
execute: obj =>
{
// logic
},
canExecute: obj =>
{
// canExecute logic
return true;
// Change this based on your conditions
}
);
```
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