feat(IThemeProvider): add TriggerThemeChanged method

src/BootstrapBlazor/Services/DefaultThemeProvider.cs

@@ -20,11 +20,6 @@ public async ValueTask SetThemeAsync(string themeName)
     {
         var module = await jsRuntime.LoadUtility();
         await module.SetThemeAsync(themeName);
-
-        if (ThemeChangedAsync is not null)
-        {
-            await ThemeChangedAsync(themeName);
-        }
     }
 
     /// <summary>
@@ -35,4 +30,12 @@ public async ValueTask SetThemeAsync(string themeName)
         var module = await jsRuntime.LoadUtility();
         return await module.GetThemeAsync();
     }
+
+    /// <summary>
+    /// <inheritdoc/>
+    /// </summary>
+    public void TriggerThemeChanged(string themeName)
+    {
+        ThemeChangedAsync?.Invoke(themeName);
+    }
 }

src/BootstrapBlazor/Services/IThemeProvider.cs

@@ -27,4 +27,10 @@ public interface IThemeProvider
     /// The callback when theme changed
     /// </summary>
     Func<string, Task>? ThemeChangedAsync { get; set; }
+
+    /// <summary>
+    /// Trigger the theme changed event
+    /// </summary>
+    /// <param name="themeName">The name of the theme to set.</param>
+    void TriggerThemeChanged(string themeName);
 }

test/UnitTest/Services/ThemeProviderTest.cs

@@ -12,12 +12,15 @@ public async Task SetTheme_Ok()
     {
         var themeName = "";
         var themeProviderService = Context.Services.GetRequiredService<IThemeProvider>();
+        themeProviderService.TriggerThemeChanged("light");
+
         themeProviderService.ThemeChangedAsync = async theme =>
         {
             themeName = theme;
             await Task.CompletedTask;
         };
         await themeProviderService.SetThemeAsync("light");
+        themeProviderService.TriggerThemeChanged("light");
         Assert.Equal("light", themeName);
     }