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Mediator pipelines

MediatR​

Install Valiant.Validation.MediatR, register generated validators, and add the behavior through MediatR configuration:

builder.Services.AddValiantValidators();

builder.Services.AddMediatR(configuration =>
{
    configuration.RegisterServicesFromAssemblyContaining<CreateUserCommand>();
    configuration.AddValiantValidation();
});

The package targets MediatR 12.5.0, the final free MediatR release.

Source-generated Mediator​

Install Valiant.Validation.Mediator:

builder.Services.AddValiantValidators();
builder.Services.AddMediator(options =>
{
    options.Assemblies = [typeof(CreateUserCommand).Assembly];
});
builder.Services.AddValiantMediatorValidation();

For Native AOT, list the behavior in the source-generated pipeline:

builder.Services.AddMediator(options =>
{
    options.Assemblies = [typeof(CreateUserCommand).Assembly];
    options.PipelineBehaviors = [typeof(ValiantValidationBehavior<,>)];
});
Choose one Mediator registration path

Do not call AddValiantMediatorValidation() when ValiantValidationBehavior<,> is already present in PipelineBehaviors.

Both integrations resolve all registered IValidator<TRequest> instances, run them before the next handler, and surface validation failure instead of invoking the handler.