Table of Contents

BLAZMVVM0020: Route Parameter Binding Analyzer

Diagnostic Information

  • Diagnostic ID: BLAZMVVM0020
  • Category: Blazing.Mvvm
  • Severity: Warning
  • Title: Route parameter missing corresponding property

Description

Detects route parameters in @page directives that don't have corresponding [Parameter] properties in the View or [ViewParameter] properties in the ViewModel, preventing proper parameter binding.

Examples

❌ Incorrect

@page "/product/{id}"
@inherits MvvmComponentBase<ProductViewModel>
// ⚠️ Warning: Missing binding for route parameter 'id'

[ViewModelDefinition]
public class ProductViewModel : ViewModelBase
{
    // Missing [ViewParameter] for 'id'
}

✅ Correct (ViewModel Parameter)

@page "/product/{id}"
@inherits MvvmComponentBase<ProductViewModel>

[ViewModelDefinition]
public class ProductViewModel : ViewModelBase
{
    [ViewParameter]
    public int Id { get; set; } // Bound to the route parameter
}

✅ Correct (View Parameter)

@page "/product/{id}"
@inherits MvvmComponentBase<ProductViewModel>

@code {
    [Parameter]
    public int Id { get; set; } // Bound to the route parameter
}

Route Parameter Types

Supported type constraints:

  • {id:int} - Integer
  • {id:guid} - GUID
  • {id:bool} - Boolean
  • {id:datetime} - DateTime
  • {id:decimal} - Decimal
  • {id} - String (default)

Benefits

  • Prevents runtime binding errors
  • Ensures all route parameters are captured
  • Type-safe route parameter passing
  • Better compile-time validation
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