Add UseDefaultServiceProvider extension methods for WebAssembly host builder

src/Components/WebAssembly/WebAssembly/src/Hosting/WebAssemblyHostBuilder.cs

@@ -30,6 +30,7 @@ public sealed class WebAssemblyHostBuilder
     private Func<IServiceProvider> _createServiceProvider;
     private RootTypeCache? _rootComponentCache;
     private string? _persistedState;
+    private ServiceProviderOptions? _serviceProviderOptions;
 
     /// <summary>
     /// Creates an instance of <see cref="WebAssemblyHostBuilder"/> using the most common
@@ -91,7 +92,16 @@ internal WebAssemblyHostBuilder(IInternalJSImportMethods jsMethods)
 
         _createServiceProvider = () =>
         {
-            return Services.BuildServiceProvider(validateScopes: WebAssemblyHostEnvironmentExtensions.IsDevelopment(hostEnvironment));
+            var isDevelopment = WebAssemblyHostEnvironmentExtensions.IsDevelopment(hostEnvironment);
+
+            // Use custom options if provided, otherwise use defaults
+            var options = _serviceProviderOptions ?? new ServiceProviderOptions
+            {
+                ValidateScopes = isDevelopment,
+                ValidateOnBuild = isDevelopment
+            };
+
+            return Services.BuildServiceProvider(options);
         };
     }
 
@@ -276,6 +286,17 @@ public void ConfigureContainer<TBuilder>(IServiceProviderFactory<TBuilder> facto
         };
     }
 
+    // In WebAssemblyHostBuilder class:
+    /// <summary>
+    /// Configures the service provider options for this host builder.
+    /// </summary>
+    /// <param name="options">The service provider options to use.</param>
+    public WebAssemblyHostBuilder UseServiceProviderOptions(ServiceProviderOptions options)
+    {
+        _serviceProviderOptions = options ?? throw new ArgumentNullException(nameof(options));
+        return this;
+    }
+
     /// <summary>
     /// Builds a <see cref="WebAssemblyHost"/> instance based on the configuration of this builder.
     /// </summary>

src/Components/WebAssembly/WebAssembly/src/Hosting/WebassemblyHostBuilderExtensions.cs

@@ -0,0 +1,44 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Microsoft.AspNetCore.Components.WebAssembly.Hosting;
+
+/// <summary>
+/// Extension methods for configuring a <see cref="WebAssemblyHostBuilder"/>.
+/// </summary>
+public static class WebAssemblyHostBuilderExtensions
+{
+    /// <summary>
+    /// Configures the default service provider for the WebAssembly host.
+    /// </summary>
+    /// <param name="builder">The <see cref="WebAssemblyHostBuilder"/> to configure.</param>
+    /// <param name="configure">A callback used to configure the <see cref="ServiceProviderOptions"/>.</param>
+    /// <returns>The <see cref="WebAssemblyHostBuilder"/>.</returns>
+    public static WebAssemblyHostBuilder UseDefaultServiceProvider(
+        this WebAssemblyHostBuilder builder,
+        Action<ServiceProviderOptions> configure)
+    {
+        return builder.UseDefaultServiceProvider((env, options) => configure(options));
+    }
+
+    /// <summary>
+    /// Configures the default service provider for the WebAssembly host.
+    /// </summary>
+    /// <param name="builder">The <see cref="WebAssemblyHostBuilder"/> to configure.</param>
+    /// <param name="configure">A callback used to configure the <see cref="ServiceProviderOptions"/> with access to the host environment.</param>
+    /// <returns>The <see cref="WebAssemblyHostBuilder"/>.</returns>
+    public static WebAssemblyHostBuilder UseDefaultServiceProvider(
+        this WebAssemblyHostBuilder builder,
+        Action<IWebAssemblyHostEnvironment, ServiceProviderOptions> configure)
+    {
+        ArgumentNullException.ThrowIfNull(builder);
+        ArgumentNullException.ThrowIfNull(configure);
+
+        var options = new ServiceProviderOptions();
+        configure(builder.HostEnvironment, options);
+
+        return builder.UseServiceProviderOptions(options);
+    }
+}

src/Components/WebAssembly/WebAssembly/src/PublicAPI.Unshipped.txt

@@ -1,4 +1,6 @@
 #nullable enable
+Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder.UseServiceProviderOptions(Microsoft.Extensions.DependencyInjection.ServiceProviderOptions! options) -> Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder!
+Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilderExtensions
 Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.Delta
 Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.Delta.Delta() -> void
 Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.Delta.ILDelta.get -> byte[]!
@@ -17,4 +19,6 @@ Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.LogEn
 Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.LogEntry.Message.init -> void
 Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.LogEntry.Severity.get -> int
 Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.LogEntry.Severity.init -> void
+static Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilderExtensions.UseDefaultServiceProvider(this Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder! builder, System.Action<Microsoft.AspNetCore.Components.WebAssembly.Hosting.IWebAssemblyHostEnvironment!, Microsoft.Extensions.DependencyInjection.ServiceProviderOptions!>! configure) -> Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder!
+static Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilderExtensions.UseDefaultServiceProvider(this Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder! builder, System.Action<Microsoft.Extensions.DependencyInjection.ServiceProviderOptions!>! configure) -> Microsoft.AspNetCore.Components.WebAssembly.Hosting.WebAssemblyHostBuilder!
 static Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.ApplyHotReloadDeltas(Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.Delta[]! deltas, int loggingLevel) -> Microsoft.AspNetCore.Components.WebAssembly.HotReload.WebAssemblyHotReload.LogEntry[]!

src/Components/WebAssembly/WebAssembly/test/Hosting/WebAssemblyHostBuilderTest.cs

@@ -98,12 +98,9 @@ public void Build_InDevelopment_ConfiguresWithServiceProviderWithScopeValidation
         builder.Services.AddScoped<StringBuilder>();
         builder.Services.AddSingleton<TestServiceThatTakesStringBuilder>();
 
-        // Act
-        var host = builder.Build();
-
-        // Assert
-        Assert.NotNull(host.Services.GetRequiredService<StringBuilder>());
-        Assert.Throws<InvalidOperationException>(() => host.Services.GetRequiredService<TestServiceThatTakesStringBuilder>());
+        // Act & Assert
+        var exception = Assert.Throws<AggregateException>(() => builder.Build());
+        Assert.Contains("Cannot consume scoped service", exception.Message);
     }
 
     [Fact]
@@ -248,4 +245,69 @@ public void Builder_SupportsConfiguringLogging()
         Assert.Equal<ILoggerProvider>(provider.Object, loggerProvider);
 
     }
+
+    [Fact]
+    public void UseDefaultServiceProvider_DetectsCircularDependencies()
+    {
+        // Arrange
+        var builder = new WebAssemblyHostBuilder(new TestInternalJSImportMethods());
+
+        // Add a circular dependency
+        builder.Services.AddScoped<CircularServiceA>();
+        builder.Services.AddScoped<CircularServiceB>();
+
+        // Act
+        builder.UseDefaultServiceProvider(options =>
+        {
+            options.ValidateOnBuild = true;
+        });
+
+        // Assert
+        var exception = Assert.Throws<AggregateException>(() => builder.Build());
+        Assert.Contains("circular dependency", exception.Message.ToLowerInvariant());
+    }
+
+    [Fact]
+    public void UseDefaultServiceProvider_EnvironmentOverload_WorksCorrectly()
+    {
+        // Arrange
+        var builder = new WebAssemblyHostBuilder(new TestInternalJSImportMethods(environment: "Development"));
+
+        // Act
+        builder.UseDefaultServiceProvider((env, options) =>
+        {
+            options.ValidateOnBuild = env.IsDevelopment();
+        });
+
+        var host = builder.Build();
+
+        // Assert
+        Assert.NotNull(host);
+    }
+
+    [Fact]
+    public void DefaultServiceProviderOptions_InDevelopment_ValidatesOnBuild()
+    {
+        // Arrange
+        var builder = new WebAssemblyHostBuilder(new TestInternalJSImportMethods(environment: "Development"));
+
+        // Add a circular dependency - should throw due to default ValidateOnBuild=true in development
+        builder.Services.AddScoped<CircularServiceA>();
+        builder.Services.AddScoped<CircularServiceB>();
+
+        // Act & Assert
+        var exception = Assert.Throws<AggregateException>(() => builder.Build());
+        Assert.Contains("circular dependency", exception.Message.ToLowerInvariant());
+    }
+
+    // Helper classes for testing circular dependencies
+    private class CircularServiceA
+    {
+        public CircularServiceA(CircularServiceB serviceB) { }
+    }
+
+    private class CircularServiceB
+    {
+        public CircularServiceB(CircularServiceA serviceA) { }
+    }
 }