小编She*_*ahu的帖子

我有一个 Angular 项目，按照https://update.angular.io/#7.2:9.0从 7.2 升级到 9

升级后，除 MatDialog 之外的所有内容均正常工作。打开该对话框会显示一个大小不成比例的空弹出窗口，并在控制台中显示以下错误。

core.js:3866 ERROR Error: Uncaught (in promise): TypeError: Cannot read property "hasAttached" of undefined
TypeError: Cannot read property "hasAttached" of undefined
    at MatDialogContainer.push../node_modules/@angular/material/esm5/dialog.es5.js.MatDialogContainer.attachComponentPortal (dialog.es5.js:191)
    at MatDialog.push../node_modules/@angular/material/esm5/dialog.es5.js.MatDialog._attachDialogContent (dialog.es5.js:1046)
    at MatDialog.push../node_modules/@angular/material/esm5/dialog.es5.js.MatDialog.open (dialog.es5.js:850)
    at new AppComponent (app.component.ts:67)
    at createClass (core.js:22218)
    at createDirectiveInstance (core.js:22087)
    at createViewNodes (core.js:30632)
    at createRootView (core.js:30546)
    at callWithDebugContext (core.js:31554)
    at Object.debugCreateRootView [as createRootView] (core.js:31064)
    at resolvePromise (zone.js:836)
    at resolvePromise (zone.js:795)
    at zone.js:897
    at ZoneDelegate.invokeTask (zone.js:431)
    at Object.onInvokeTask (core.js:27441)
    at ZoneDelegate.invokeTask (zone.js:430) …