将 DbContext 注入 FluentValidation 验证器
我正在使用 FluentValidation 库对我的模型之一强制执行唯一约束：
public class Foo {
// No two Foos can have the same value for Bar
public int Bar { get; set; }
}
public class FooValidator : AbstractValidator<Foo> {
public FooValidator(ApplicationDbContext context) {
this.context = context;
RuleFor(m => m.Bar)
.Must(BeUnique).WithMessage("Bar must be unique!");
}
private readonly ApplicationDbContext context;
public bool BeUnique(int bar) {
return !context.Foos.Any(foo => foo.Bar == bar);
}
}
使用 StructureMap 注入 ApplicationDbContext 值。为了确保在每个请求结束时释放上下文，我尝试在应用程序的 EndRequest 处理程序中调用 ObjectFactory.ReleaseAndDisposeAllHttpScopedObjects()。
不幸的是，似乎在我的验证器类能够完成其工作之前就调用了 Application_EndRequest 方法，并且在执行 FooValidator.BeUnique 时上下文已被释放。
是否有更好的方法来使用 FluentValidation 库执行依赖于数据库的验证，或者是将这个逻辑移到其他地方（控制器操作、数据库本身或其他地方）的唯一解决方案？
I am using the FluentValidation library to enforce a unique constraint on one of my models:
public class Foo {
// No two Foos can have the same value for Bar
public int Bar { get; set; }
}
public class FooValidator : AbstractValidator<Foo> {
public FooValidator(ApplicationDbContext context) {
this.context = context;
RuleFor(m => m.Bar)
.Must(BeUnique).WithMessage("Bar must be unique!");
}
private readonly ApplicationDbContext context;
public bool BeUnique(int bar) {
return !context.Foos.Any(foo => foo.Bar == bar);
}
}
The ApplicationDbContext value is injected using StructureMap. To make sure that the context is disposed of at the end of every request, I attempted to call ObjectFactory.ReleaseAndDisposeAllHttpScopedObjects() in the EndRequest handler for my application.
Unfortunately, it appears as though the Application_EndRequest method is called before my validator class is able to do its job and the context is disposed by the time FooValidator.BeUnique is executed.
Is there a better way to perform database-dependent validations with the FluentValidation library, or is the only solution to move this logic elsewhere (either to the controller action, the DB itself, or maybe elsewhere)?
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也许验证器不是 http 范围的（而是单例的）并且它没有用新的上下文重新创建/注入？在这种情况下，它尝试使用先前请求中已处理的上下文。
Maybe the validator is not http scoped (but singleton) and it is not recreated/injected with a new context? In this case it tries to use a disposed context from a previous request.