EDIT:我已经发现是什么导致了这个问题；我现在正在寻找一个解决方案来满足它。
NOTE：此问题发生在开发模式下（即不是生产模式，并且不使用 aot）
我正在使用这里的“更新”解决方案：
https://stackoverflow.com/a/46324043/3164070 https://stackoverflow.com/a/46324043/3164070
解决子组件中的输入未更新表单上的有效标志的问题。它在一个相当简单的测试项目中工作，但是当将其移动到我们的实际项目时，它会抛出以下错误：
core.es5.js:1020 ERROR Error: Uncaught (in promise): Error: No provider for NgForm!
Error: No provider for NgForm!
at ZoneAwareError (http://192.168.2.34:4200/vendor.bundle.js:153804:33)
at injectionError (http://192.168.2.34:4200/vendor.bundle.js:1378:90)
at noProviderError (http://192.168.2.34:4200/vendor.bundle.js:1416:12)
at ReflectiveInjector_._throwOrNull (http://192.168.2.34:4200/vendor.bundle.js:2858:19)
at ReflectiveInjector_._getByKeyDefault (http://192.168.2.34:4200/vendor.bundle.js:2897:25)
at ReflectiveInjector_._getByKey (http://192.168.2.34:4200/vendor.bundle.js:2829:25)
at ReflectiveInjector_.get (http://192.168.2.34:4200/vendor.bundle.js:2698:21)
at resolveNgModuleDep (http://192.168.2.34:4200/vendor.bundle.js:9701:25)
at NgModuleRef_.get (http://192.168.2.34:4200/vendor.bundle.js:10771:16)
at resolveDep (http://192.168.2.34:4200/vendor.bundle.js:11259:45)
at _createProviderInstance (http://192.168.2.34:4200/vendor.bundle.js:11102:20)
at resolveDep (http://192.168.2.34:4200/vendor.bundle.js:11238:56)
at createClass (http://192.168.2.34:4200/vendor.bundle.js:11129:32)
at createDirectiveInstance (http://192.168.2.34:4200/vendor.bundle.js:10960:37)
at createViewNodes (http://192.168.2.34:4200/vendor.bundle.js:12401:53)
at ZoneAwareError (http://192.168.2.34:4200/vendor.bundle.js:153804:33)
at injectionError (http://192.168.2.34:4200/vendor.bundle.js:1378:90)
at noProviderError (http://192.168.2.34:4200/vendor.bundle.js:1416:12)
at ReflectiveInjector_._throwOrNull (http://192.168.2.34:4200/vendor.bundle.js:2858:19)
at ReflectiveInjector_._getByKeyDefault (http://192.168.2.34:4200/vendor.bundle.js:2897:25)
at ReflectiveInjector_._getByKey (http://192.168.2.34:4200/vendor.bundle.js:2829:25)
at ReflectiveInjector_.get (http://192.168.2.34:4200/vendor.bundle.js:2698:21)
at resolveNgModuleDep (http://192.168.2.34:4200/vendor.bundle.js:9701:25)
at NgModuleRef_.get (http://192.168.2.34:4200/vendor.bundle.js:10771:16)
at resolveDep (http://192.168.2.34:4200/vendor.bundle.js:11259:45)
at _createProviderInstance (http://192.168.2.34:4200/vendor.bundle.js:11102:20)
at resolveDep (http://192.168.2.34:4200/vendor.bundle.js:11238:56)
at createClass (http://192.168.2.34:4200/vendor.bundle.js:11129:32)
at createDirectiveInstance (http://192.168.2.34:4200/vendor.bundle.js:10960:37)
at createViewNodes (http://192.168.2.34:4200/vendor.bundle.js:12401:53)
at resolvePromise (http://192.168.2.34:4200/vendor.bundle.js:153599:31) [angular]
at resolvePromise (http://192.168.2.34:4200/vendor.bundle.js:153570:17) [angular]
at http://192.168.2.34:4200/vendor.bundle.js:153647:17 [angular]
at Object.onInvokeTask (http://192.168.2.34:4200/vendor.bundle.js:4090:33) [angular]
at ZoneDelegate.invokeTask (http://192.168.2.34:4200/vendor.bundle.js:153284:36) [angular]
at Zone.runTask (http://192.168.2.34:4200/vendor.bundle.js:153052:47) [<root> => angular]
at drainMicroTaskQueue (http://192.168.2.34:4200/vendor.bundle.js:153480:35) [<root>]
at <anonymous> [<root>]
问题是相同的组件可以在不存在于表单上的情况下使用，因此 NgForm 没有提供程序。
在没有表单的情况下，是否有某种方法可以动态使用 viewProviders 成员？
是的，您可以将其提供为null如果没有父母NgForm提供者：
export function controlContainerFactory(controlContainer?: ControlContainer) {
return controlContainer;
}
...
viewProviders: [
{
provide: ControlContainer,
useFactory: controlContainerFactory,
deps: [[new Optional(), NgForm]]
^^^^^^^^^^
should do the trick
}
]
堆栈闪电战示例 https://stackblitz.com/edit/angular-ee2vhj?file=app/child.component.ts
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