在Angular项目中，可以使用NgRx来管理应用程序的状态。当处理表单时，可以使用NGRX动作来处理表单的依赖关系。下面是一个示例解决方法：

首先，安装必要的依赖项。在命令行中运行以下命令：

npm install @ngrx/store @ngrx/effects --save

然后，创建一个名为form.actions.ts的文件，并添加以下代码：

import { createAction, props } from '@ngrx/store';

export const loadForm = createAction('[Form] Load Form');
export const loadFormSuccess = createAction('[Form] Load Form Success', props<{ form: any }>());
export const loadFormFailure = createAction('[Form] Load Form Failure', props<{ error: any }>());
export const updateForm = createAction('[Form] Update Form', props<{ form: any }>());
export const submitForm = createAction('[Form] Submit Form', props<{ form: any }>());
export const submitFormSuccess = createAction('[Form] Submit Form Success');
export const submitFormFailure = createAction('[Form] Submit Form Failure', props<{ error: any }>());

然后，创建一个名为form.reducer.ts的文件，并添加以下代码：

import { createReducer, on } from '@ngrx/store';
import * as FormActions from './form.actions';

export interface FormState {
  form: any;
  loading: boolean;
  error: any;
}

export const initialState: FormState = {
  form: null,
  loading: false,
  error: null
};

export const formReducer = createReducer(
  initialState,
  on(FormActions.loadForm, state => ({
    ...state,
    loading: true,
    error: null
  })),
  on(FormActions.loadFormSuccess, (state, { form }) => ({
    ...state,
    form,
    loading: false
  })),
  on(FormActions.loadFormFailure, (state, { error }) => ({
    ...state,
    error,
    loading: false
  })),
  on(FormActions.updateForm, (state, { form }) => ({
    ...state,
    form
  })),
  on(FormActions.submitForm, state => ({
    ...state,
    loading: true,
    error: null
  })),
  on(FormActions.submitFormSuccess, state => ({
    ...state,
    loading: false
  })),
  on(FormActions.submitFormFailure, (state, { error }) => ({
    ...state,
    error,
    loading: false
  }))
);

接下来，创建一个名为form.effects.ts的文件，并添加以下代码：

import { Injectable } from '@angular/core';
import { Actions, createEffect, ofType } from '@ngrx/effects';
import { of } from 'rxjs';
import { catchError, map, mergeMap } from 'rxjs/operators';
import * as FormActions from './form.actions';
import { FormService } from './form.service';

@Injectable()
export class FormEffects {
  loadForm$ = createEffect(() =>
    this.actions$.pipe(
      ofType(FormActions.loadForm),
      mergeMap(() =>
        this.formService.getForm().pipe(
          map(form => FormActions.loadFormSuccess({ form })),
          catchError(error => of(FormActions.loadFormFailure({ error })))
        )
      )
    )
  );

  submitForm$ = createEffect(() =>
    this.actions$.pipe(
      ofType(FormActions.submitForm),
      mergeMap(({ form }) =>
        this.formService.submitForm(form).pipe(
          map(() => FormActions.submitFormSuccess()),
          catchError(error => of(FormActions.submitFormFailure({ error })))
        )
      )
    )
  );

  constructor(
    private actions$: Actions,
    private formService: FormService
  ) {}
}

然后，创建一个名为form.service.ts的文件，并添加以下代码：

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class FormService {
  constructor(private http: HttpClient) {}

  getForm(): Observable {
    return this.http.get('api/form');
  }

  submitForm(form: any): Observable {
    return this.http.post('api/submit', form);
  }
}

最后，在需要使用表单的组件中，添加以下代码：

import { Component, OnInit } from '@angular/core';
import { Store } from '@ngrx/store';
import { Observable } from 'rxjs';
import * as FormActions from './form.actions';
import { FormState } from './form.reducer';

@Component({
  selector: 'app