[Blazor] Lazy loading - Complete example - Prevent repeated loads

hakenr · web-flow · commit ed59c2f6b5ad · 2024-11-29T01:37:02.000+01:00
diff --git a/aspnetcore/blazor/webassembly-lazy-load-assemblies.md b/aspnetcore/blazor/webassembly-lazy-load-assemblies.md
@@ -596,13 +596,15 @@ 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)
             {
+                grantImaharaRobotControlsAssemblyLoaded = true;
                 var assemblies = await AssemblyLoader.LoadAssembliesAsync(
                     new[] { "GrantImaharaRobotControls.{FILE EXTENSION}" });
                 lazyLoadedAssemblies.AddRange(assemblies);
@@ -648,13 +650,15 @@ 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)
             {
+                grantImaharaRobotControlsAssemblyLoaded = true;
                 var assemblies = await AssemblyLoader.LoadAssembliesAsync(
                     new[] { "GrantImaharaRobotControls.{FILE EXTENSION}" });
                 lazyLoadedAssemblies.AddRange(assemblies);

Original file line number	Diff line number	Diff line change
`@@ -596,13 +596,15 @@ The assembly is assigned to <xref:Microsoft.AspNetCore.Components.Routing.Router`
`596`	`596`
`597`	`597`	`@code {`
`598`	`598`	`private List<Assembly> lazyLoadedAssemblies = new();`
	`599`	`+ private bool grantImaharaRobotControlsAssemblyLoaded;`
`599`	`600`
`600`	`601`	`private async Task OnNavigateAsync(NavigationContext args)`
`601`	`602`	`{`
`602`	`603`	`try`
`603`	`604`	`{`
`604`		`- if (args.Path == "robot")`
	`605`	`+ if ((args.Path == "robot") && !grantImaharaRobotControlsAssemblyLoaded)`
`605`	`606`	`{`
	`607`	`+ grantImaharaRobotControlsAssemblyLoaded = true;`
`606`	`608`	`var assemblies = await AssemblyLoader.LoadAssembliesAsync(`
`607`	`609`	`new[] { "GrantImaharaRobotControls.{FILE EXTENSION}" });`
`608`	`610`	`lazyLoadedAssemblies.AddRange(assemblies);`
`@@ -648,13 +650,15 @@ The assembly is assigned to <xref:Microsoft.AspNetCore.Components.Routing.Router`
`648`	`650`
`649`	`651`	`@code {`
`650`	`652`	`private List<Assembly> lazyLoadedAssemblies = new List<Assembly>();`
	`653`	`+ private bool grantImaharaRobotControlsAssemblyLoaded;`
`651`	`654`
`652`	`655`	`private async Task OnNavigateAsync(NavigationContext args)`
`653`	`656`	`{`
`654`	`657`	`try`
`655`	`658`	`{`
`656`		`- if (args.Path == "robot")`
	`659`	`+ if ((args.Path == "robot") && !grantImaharaRobotControlsAssemblyLoaded)`
`657`	`660`	`{`
	`661`	`+ grantImaharaRobotControlsAssemblyLoaded = true;`
`658`	`662`	`var assemblies = await AssemblyLoader.LoadAssembliesAsync(`
`659`	`663`	`new[] { "GrantImaharaRobotControls.{FILE EXTENSION}" });`
`660`	`664`	`lazyLoadedAssemblies.AddRange(assemblies);`