https://github.com/arnab-developer/optionpatterndemo
ASP.NET option pattern demo
https://github.com/arnab-developer/optionpatterndemo
Last synced: 3 months ago
JSON representation
ASP.NET option pattern demo
- Host: GitHub
- URL: https://github.com/arnab-developer/optionpatterndemo
- Owner: Arnab-Developer
- License: mit
- Created: 2021-04-09T06:06:18.000Z (about 4 years ago)
- Default Branch: main
- Last Pushed: 2021-04-21T07:43:01.000Z (about 4 years ago)
- Last Synced: 2025-01-17T02:24:16.638Z (5 months ago)
- Language: C#
- Size: 651 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# ASP.NET option pattern demo
This is a demo app to show the difference between `IOptionsMonitor`, `IOptions`
and `IOptionsSnapshot`.
- IOptionsMonitor: always return the new value
- IOptions: always return the old value until the app is restarted
- IOptionsSnapshot: return the new value if it is a new request
There are two action methods, `Index` and `Privacy`. Both the methods are having
the same code in it which is getting the value of `Name `from `appsettings` for
20 times in a loop using `IOptionsMonitor`, `IOptions` and `IOptionsSnapshot`.
```c#
for (int i = 0; i < 20; i++)
{
string name1 = _optionsMonitor.CurrentValue.Name;
string name2 = _options.Value.Name;
string name3 = _optionsSnapshot.Value.Name;
}
```
If you put a breakpoint in the loop in the `Index` method and while the loop is
executing, if you change the value of the `Name` in `appsettings` then you can able
to see that `IOptionsMonitor` is returning the new value but `IOptions` and
`IOptionsSnapshot` is returning the old value.
When redirect happens from `Index` to `Privacy` then a new request has been made
and now you can able to see `IOptionsSnapshot` is returning the new value like
`IOptionsMonitor` but `IOptions` is still returning the old value.
If you restart the app then you will able to see that `IOptions` is returning the
new value like `IOptionsMonitor` and `IOptionsSnapshot`.
For more information about ASP.NET option pattern, please read
[this doc](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options?view=aspnetcore-5.0).
## Tech stack
Visual Studio 2019 and ASP.NET 5