5 |
6 | Based on the observer design pattern in which an object, called the subject, maintains a list of its dependents, called observers, and notifies them automatically of any state changes, usually by calling one of their methods.
7 |
8 | 
9 |
10 | ## Database table
11 | Table for which I want to receive notifications every time its content changes:
12 |
13 | ```SQL
14 | CREATE TABLE [dbo].[WeatherForecasts](
15 | [City] [nvarchar](50) NOT NULL,
16 | [Temperature] [int] NOT NULL
17 | )
18 | ```
19 |
20 | ## Subject
21 | Singleton instance wrapping SqlTableDependency and forwarding record table changes to subscribers:
22 |
23 | ```C#
24 | public delegate void WeatherForecastDelegate(object sender, WeatherForecastChangeEventArgs args);
25 |
26 | public class WeatherForecastChangeEventArgs : EventArgs
27 | {
28 | public WeatherForecast NewWeatherForecast { get; }
29 | public WeatherForecast OldWeatherForecast { get; }
30 |
31 | public WeatherForecastChangeEventArgs(WeatherForecast newWeatherForecast, WeatherForecast oldWeatherForecast)
32 | {
33 | this.NewWeatherForecast = newWeatherForecast;
34 | this.OldWeatherForecast = oldWeatherForecast;
35 | }
36 | }
37 |
38 | public interface IWeatherForecastService
39 | {
40 | public event WeatherForecastDelegate OnWeatherForecastChanged;
41 | IList
5 | @Body
6 |
7 | Weather forecast
133 | 134 |Immediate client notification on record table change with Blazor
135 | 136 || City | 140 |Temp. (C) | 141 |
|---|---|
| @forecast.City | 148 |@forecast.Temperature | 149 |
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8 |Weather forecast
9 | 10 |Immediate client notification on record table change with Blazor
11 | 12 || City | 16 |Temp. (C) | 17 |
|---|---|
| @forecast.City | 24 |@forecast.Temperature | 25 |
4 |
8 |
--------------------------------------------------------------------------------
/src/Startup.cs:
--------------------------------------------------------------------------------
1 | using System;
2 | using System.Collections.Generic;
3 | using System.Linq;
4 | using System.Threading.Tasks;
5 | using Microsoft.AspNetCore.Builder;
6 | using Microsoft.AspNetCore.Components;
7 | using Microsoft.AspNetCore.Hosting;
8 | using Microsoft.AspNetCore.HttpsPolicy;
9 | using Microsoft.Extensions.Configuration;
10 | using Microsoft.Extensions.DependencyInjection;
11 | using Microsoft.Extensions.Hosting;
12 | using DataBaseRecordChaneNotificationWithBlazor.Data;
13 |
14 | namespace DataBaseRecordChaneNotificationWithBlazor
15 | {
16 | public class Startup
17 | {
18 | public Startup(IConfiguration configuration)
19 | {
20 | Configuration = configuration;
21 | }
22 |
23 | public IConfiguration Configuration { get; }
24 |
25 | // This method gets called by the runtime. Use this method to add services to the container.
26 | // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
27 | public void ConfigureServices(IServiceCollection services)
28 | {
29 | services.AddRazorPages();
30 | services.AddServerSideBlazor();
31 | services.AddSingleton
30 | ```
31 |
32 | #### Using Open Iconic's SVG Sprite
33 |
34 | Open Iconic also comes in a SVG sprite which allows you to display all the icons in the set with a single request. It's like an icon font, without being a hack.
35 |
36 | Adding an icon from an SVG sprite is a little different than what you're used to, but it's still a piece of cake. *Tip: To make your icons easily style able, we suggest adding a general class to the* `