[Blazor] Lazy loading - Complete example - Prevent repeated loads (#34243)

hakenr · web-flow · commit 9092b764ec0d · 2024-12-12T12:23:57.000Z
diff --git a/aspnetcore/blazor/webassembly-lazy-load-assemblies.md b/aspnetcore/blazor/webassembly-lazy-load-assemblies.md
@@ -592,16 +592,18 @@ The assembly is assigned to <xref:Microsoft.AspNetCore.Components.Routing.Router
 
 @code {
     private List<Assembly> lazyLoadedAssemblies = new();
+    private bool grantImaharaRobotControlsAssemblyLoaded;
 
     private async Task OnNavigateAsync(NavigationContext args)
     {
         try
         {
-            if (args.Path == "robot")
+            if ((args.Path == "robot") && !grantImaharaRobotControlsAssemblyLoaded)
             {
                 var assemblies = await AssemblyLoader.LoadAssembliesAsync(
                     new[] { "GrantImaharaRobotControls.{FILE EXTENSION}" });
                 lazyLoadedAssemblies.AddRange(assemblies);
+                grantImaharaRobotControlsAssemblyLoaded = true;
             }
         }
         catch (Exception ex)
@@ -644,16 +646,18 @@ The assembly is assigned to <xref:Microsoft.AspNetCore.Components.Routing.Router
 
 @code {
     private List<Assembly> lazyLoadedAssemblies = new List<Assembly>();
+    private bool grantImaharaRobotControlsAssemblyLoaded;
 
     private async Task OnNavigateAsync(NavigationContext args)
     {
         try
         {
-            if (args.Path == "robot")
+            if ((args.Path == "robot") && !grantImaharaRobotControlsAssemblyLoaded)
             {
                 var assemblies = await AssemblyLoader.LoadAssembliesAsync(
                     new[] { "GrantImaharaRobotControls.{FILE EXTENSION}" });
                 lazyLoadedAssemblies.AddRange(assemblies);
+                grantImaharaRobotControlsAssemblyLoaded = true;
             }
         }
         catch (Exception ex)

Original file line number	Diff line number	Diff line change
`@@ -592,16 +592,18 @@ The assembly is assigned to <xref:Microsoft.AspNetCore.Components.Routing.Router`
`592`	`592`
`593`	`593`	`@code {`
`594`	`594`	`private List<Assembly> lazyLoadedAssemblies = new();`
	`595`	`+ private bool grantImaharaRobotControlsAssemblyLoaded;`
`595`	`596`
`596`	`597`	`private async Task OnNavigateAsync(NavigationContext args)`
`597`	`598`	`{`
`598`	`599`	`try`
`599`	`600`	`{`
`600`		`- if (args.Path == "robot")`
	`601`	`+ if ((args.Path == "robot") && !grantImaharaRobotControlsAssemblyLoaded)`
`601`	`602`	`{`
`602`	`603`	`var assemblies = await AssemblyLoader.LoadAssembliesAsync(`
`603`	`604`	`new[] { "GrantImaharaRobotControls.{FILE EXTENSION}" });`
`604`	`605`	`lazyLoadedAssemblies.AddRange(assemblies);`
	`606`	`+ grantImaharaRobotControlsAssemblyLoaded = true;`
`605`	`607`	`}`
`606`	`608`	`}`
`607`	`609`	`catch (Exception ex)`
`@@ -644,16 +646,18 @@ The assembly is assigned to <xref:Microsoft.AspNetCore.Components.Routing.Router`
`644`	`646`
`645`	`647`	`@code {`
`646`	`648`	`private List<Assembly> lazyLoadedAssemblies = new List<Assembly>();`
	`649`	`+ private bool grantImaharaRobotControlsAssemblyLoaded;`
`647`	`650`
`648`	`651`	`private async Task OnNavigateAsync(NavigationContext args)`
`649`	`652`	`{`
`650`	`653`	`try`
`651`	`654`	`{`
`652`		`- if (args.Path == "robot")`
	`655`	`+ if ((args.Path == "robot") && !grantImaharaRobotControlsAssemblyLoaded)`
`653`	`656`	`{`
`654`	`657`	`var assemblies = await AssemblyLoader.LoadAssembliesAsync(`
`655`	`658`	`new[] { "GrantImaharaRobotControls.{FILE EXTENSION}" });`
`656`	`659`	`lazyLoadedAssemblies.AddRange(assemblies);`
	`660`	`+ grantImaharaRobotControlsAssemblyLoaded = true;`
`657`	`661`	`}`
`658`	`662`	`}`
`659`	`663`	`catch (Exception ex)`