Add analyzer to warn when SupplyParameterFromForm properties have non-default initializers #63110

Copilot · 2025-08-04T18:34:40Z

This PR adds a new Roslyn analyzer (BL0008) that detects when properties decorated with [SupplyParameterFromForm] have non-default initializers, which can lead to unexpected null values during form posts.

Problem

When using [SupplyParameterFromForm] with non-default property initializers like this:

public class MyComponent : ComponentBase
{
    [SupplyParameterFromForm] public InputModel Input { get; set; } = new InputModel();
}

The initializer can be overwritten with null during form submission, causing EditForm to fail with:

InvalidOperationException: EditForm requires either a Model parameter, or an EditContext parameter, please provide one of these.

Solution

The analyzer warns developers when this pattern is detected, while safely ignoring default value initializers (= null, = null!, = default, = default!) that don't cause the same issue.

Warning Message:

Property 'MyComponent.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts.

Safe patterns (ignored by analyzer):

[SupplyParameterFromForm] public InputModel Input { get; set; } = default!; // ✅ Safe
[SupplyParameterFromForm] public InputModel Input { get; set; } = null!;    // ✅ Safe

Recommended fix for problematic cases:

public class MyComponent : ComponentBase
{
    [SupplyParameterFromForm] public InputModel Input { get; set; }
    
    protected override void OnInitialized()
    {
        Input ??= new InputModel(); // Safe initialization
    }
}

Implementation Details

Analyzer ID: BL0008
Severity: Warning
Scope: Only triggers on ComponentBase-derived classes
Detection: Properties with both [SupplyParameterFromForm] and non-default initializers
Ignored: Default value initializers (= null, = null!, = default, = default!)

Test Coverage

The implementation includes comprehensive tests covering:

✅ Properties without [SupplyParameterFromForm] (ignored)
✅ [SupplyParameterFromForm] without initializers (ignored)
✅ Non-ComponentBase classes (ignored)
✅ Default value initializers: = null, = null!, = default, = default! (ignored)
✅ Non-default string and object initializers (detected)
✅ Inherited ComponentBase classes (detected)

All 49 analyzer tests pass.

Fixes #51420.

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javiercn · 2025-08-04T18:43:13Z

Be sure to read through #51420 (comment) which contains the plan here.

Co-authored-by: javiercn <[email protected]>

javiercn · 2025-08-04T20:43:32Z

src/Components/Analyzers/src/Resources.resx

@@ -180,4 +180,13 @@
  <data name="ComponentParametersShouldBeAutoProperties_Title" xml:space="preserve">
    <value>Component parameters should be auto properties</value>
  </data>
+  <data name="SupplyParameterFromFormShouldNotHavePropertyInitializer_Description" xml:space="preserve">
+    <value>Initializing a property decorated with [SupplyParameterFromForm] can be overwritten with null during a form post. To ensure the property is never null, move the initialization to a component lifecycle method.</value>


Tweak the description.

The value of a property decorated with [SupplyParameterFromForm] and initialized with a property initializer can be overwritten with null when the component receives parameters. To ensure the initialized value is not overwritten, move the initialization to a component lifecycle method like OnInitialized or OnInitializedAsync

@copilot check this

Updated the description in Resources.resx as requested (commit 93a68fa). The new description reads: "The value of a property decorated with [SupplyParameterFromForm] and initialized with a property initializer can be overwritten with null when the component receives parameters."

Updated the description to include the complete suggested text including the lifecycle method recommendation (commit 0305c3f). The description now reads: "The value of a property decorated with [SupplyParameterFromForm] and initialized with a property initializer can be overwritten with null when the component receives parameters. To ensure the initialized value is not overwritten, move the initialization to a component lifecycle method like OnInitialized or OnInitializedAsync"

Co-authored-by: javiercn <[email protected]>

Copilot · 2025-08-04T20:49:52Z

Be sure to read through #51420 (comment) which contains the plan here.

Thanks for the reference! I've reviewed the detailed plan in comment 3151926128. The current implementation aligns with the plan - it's an analyzer (BL0008) that detects properties with both [SupplyParameterFromForm] and initializers in ComponentBase-derived classes, with comprehensive test coverage including all the edge cases mentioned.

javiercn · 2025-08-04T20:52:41Z

src/Components/Analyzers/test/SupplyParameterFromFormAnalyzerTest.cs

+    public void ReportsWarningWithFormNameSpecified()
+    {
+        var test = $@"
+    namespace ConsoleApplication1
+    {{
+        using {typeof(ParameterAttribute).Namespace};
+        class TestComponent : ComponentBase
+        {{
+            [SupplyParameterFromForm(FormName = ""main-form"")] public string MyProperty {{ get; set; }} = ""default"";
+        }}
+    }}" + TestDeclarations;
+
+        var expected = new DiagnosticResult
+        {
+            Id = "BL0008",
+            Message = "Property 'ConsoleApplication1.TestComponent.MyProperty' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts.",
+            Severity = DiagnosticSeverity.Warning,
+            Locations = new[]
+            {
+                new DiagnosticResultLocation("Test0.cs", 7, 77)
+            }
+        };
+
+        VerifyCSharpDiagnostic(test, expected);
+    }


Why is this test relevant to the feature we are implementing? We don't look at the name at all, do we?

You're correct - that test was not relevant since the analyzer doesn't examine the FormName parameter at all. It only checks if the [SupplyParameterFromForm] attribute is present, regardless of what parameters are passed to it. I removed the redundant test in commit 3c8fd5a.

…ing lifecycle method recommendation Co-authored-by: javiercn <[email protected]>

Co-authored-by: javiercn <[email protected]>

Copilot

Pull Request Overview

This PR introduces a new Roslyn analyzer (BL0008) that prevents developers from accidentally using property initializers with [SupplyParameterFromForm] attributes, which can lead to null reference exceptions when form submissions overwrite the initialized values.

Key changes:

Adds a new analyzer that detects the problematic pattern and warns developers
Provides comprehensive test coverage for various scenarios
Includes proper resource strings for diagnostic messages

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
SupplyParameterFromFormAnalyzer.cs	Main analyzer implementation that detects properties with both `[SupplyParameterFromForm]` and initializers
SupplyParameterFromFormAnalyzerTest.cs	Comprehensive test suite covering valid and invalid scenarios
DiagnosticDescriptors.cs	Adds the BL0008 diagnostic descriptor with proper severity and messaging
Resources.resx	Localizable strings for the diagnostic title, format, and description
ComponentsApi.cs	API constants for SupplyParameterFromForm and ComponentBase types
ComponentSymbols.cs	Symbol resolution for the new analyzer types
ComponentFacts.cs	Helper methods to identify SupplyParameterFromForm attributes and ComponentBase inheritance

src/Components/Analyzers/src/ComponentFacts.cs

javiercn · 2025-08-04T22:08:45Z

@copilot there are some template test failures that are caused by issues in the current templates that don't follow the analyzer guidance.

Look at the errors and update the template code following the analyzer guidance to avoid them

Project new blazor  --no-restore -int None -au Individual failed to publish. Exit code 1.\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\dotnet\dotnet.exe publish  -c Release /bl \nStdErr: \nStdOut:   Determining projects to restore...\r\n  All projects are up-to-date for restore.\r\nD:\a\_work\1\s\.dotnet\sdk\10.0.100-preview.7.25322.101\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.RuntimeIdentifierInference.targets(335,5): message NETSDK1057: You are using a preview version of .NET. See: https://aka.ms/dotnet-support-policy [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\ForgotPassword.razor(38,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.ForgotPassword.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\ExternalLogin.razor(57,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.ExternalLogin.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Login.razor(82,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Login.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\ResetPassword.razor(49,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.ResetPassword.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\LoginWith2fa.razor(52,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.LoginWith2fa.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\LoginWithRecoveryCode.razor(41,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.LoginWithRecoveryCode.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Manage\ChangePassword.razor(51,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Manage.ChangePassword.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Manage\Email.razor(66,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Manage.Email.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Manage\Index.razor(44,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Manage.Index.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Manage\EnableAuthenticator.razor(81,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Manage.EnableAuthenticator.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Manage\DeletePersonalData.razor(49,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Manage.DeletePersonalData.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Manage\Passkeys.razor(68,31): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Manage.Passkeys.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Manage\SetPassword.razor(47,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Manage.SetPassword.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Manage\RenamePasskey.razor(44,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Manage.RenamePasskey.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\Register.razor(61,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.Register.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\nD:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\Components\Account\Pages\ResendEmailConfirmation.razor(40,24): error BL0008: Property 'AspNet.og4bddmkhnnv.Components.Account.Pages.ResendEmailConfirmation.Input' has [SupplyParameterFromForm] and a property initializer. This can be overwritten with null during form posts. [D:\a\_work\1\s\src\ProjectTemplates\test\Templates.Blazor.Tests\bin\Release\net10.0\TestTemplates\AspNet.og4bddmkhnnv\AspNet.og4bddmkhnnv.csproj]\r\n

Co-authored-by: javiercn <[email protected]>

Copilot · 2025-08-04T22:22:27Z

@copilot there are some template test failures that are caused by issues in the current templates that don't follow the analyzer guidance.

Look at the errors and update the template code following ...

Fixed all template test failures by updating 16 Blazor template files to remove = default! initializers from [SupplyParameterFromForm] properties while preserving the correct initialization pattern in lifecycle methods. The ProjectTemplates build now passes without BL0008 warnings (commit 28d5aba).

javiercn · 2025-08-05T07:14:32Z

@copilot I was wrong.

We want to ignore the cases where the initializer initializes the property to a default value (null or default).

Revert the changes to the templates.
Update the analyzer to ignore initializations to default value instead.
Update the tests to validate the analyzer ignores initializations like = null, = null!, = default and = default!

…ate changes - Reverted template files to original state with `= default!` initializers - Modified SupplyParameterFromFormAnalyzer to ignore default value initializers (null, null!, default, default!) - Added comprehensive tests for ignored cases: = null, = null!, = default, = default! - All 49 analyzer tests pass, confirming correct behavior Co-authored-by: javiercn <[email protected]>

Copilot · 2025-08-05T07:26:09Z

@copilot I was wrong.

We want to ignore the cases where the initializer initializes the property to a default value (null or default).
...

Updated the analyzer to ignore default value initializers as requested (commit 41245e2). The analyzer now ignores = null, = null!, = default, and = default! while still detecting problematic non-default initializers. Reverted all template changes - templates keep their original = default! patterns. Added comprehensive tests covering all ignored cases. All 49 analyzer tests pass.

src/Components/Analyzers/test/SupplyParameterFromFormAnalyzerTest.cs

…alyzer tests Co-authored-by: javiercn <[email protected]>

javiercn · 2025-08-05T10:53:56Z

src/Components/Analyzers/test/SupplyParameterFromFormAnalyzerTest.cs

+        using {typeof(ParameterAttribute).Namespace};
+        class NotAComponent
+        {{
+            [SupplyParameterFromForm] public string MyProperty {{ get; set; }} = ""default"";


Do not use default here, use "initial-value"

Fixed the remaining string literal "default" usage in the test. Changed it to "initial-value" to avoid confusion with the default keyword (commit 9a23dd5).

…alyzer tests Co-authored-by: javiercn <[email protected]>

Initial plan

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Add initial implementation of SupplyParameterFromForm analyzer

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Complete implementation and testing of SupplyParameterFromForm analyzer

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Copilot AI changed the title ~~[WIP] Blazor sets EditForm Model to null in unexpected situations~~ Add analyzer to warn when SupplyParameterFromForm properties have initializers Aug 4, 2025

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Update Resources.resx description per feedback

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Update Resources.resx description with complete suggested text includ…

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[Known Build Error] NavigationException_InAsyncContext_DoesNotBecomeUnobservedTaskException fails with ObjectDisposedException #62672

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Remove irrelevant test that checks FormName parameter

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Fix template files to follow BL0008 analyzer guidance

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Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. dotnet/dnceng#5922

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Replace confusing 'default' string literal with 'initial-value' in an…

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Replace remaining string literal 'default' with 'initial-value' in an…

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Known Build Error: error : Cannot create a file when that file already exists. #61178

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Add analyzer to warn when SupplyParameterFromForm properties have non-default initializers #63110

Add analyzer to warn when SupplyParameterFromForm properties have non-default initializers #63110

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