Angular5.2 added components with ngComponentOutlet without bind ngif? how to deal with it?

Code
parent component
html:
< ng-container * ngComponentOutlet= "switchComponent" > < / ng-container >
ts:
public switchComponent = null;
constructor () {

this.switchComponent = PatientRecordComponent;

}
subcomponents
< div * ngif= "false" > ssss < / div >

try to solve
parent component
html:
< ng-container * ngComponentOutlet= "switchComponent; ngModuleFactory: myModule;" > < / ng-container >
ts:
import {NgModuleFactory, Compiler} from"@ angular/core";
import {PatientRecord} from". / common/patient/record/record.module";
public switchComponent = null;
myModule: NgModuleFactory ;
constructor (compiler: Compiler) {

this.myModule = compiler.compileModuleSync(PatientRecord);
this.switchComponent = PatientRecordComponent;

}

Angular2 javascript

Mar.12,2021

you need to import CommonModule into the module corresponding to AppModule or your component

import { CommonModule } from '@angular/common';
@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    CommonModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})

because * ngFor * ngIf these instructions are defined in CommonModule and exported for external use.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b38a3a-2c133.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b38a3a-2c133.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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