Angular Material Wrapper类给出错误

Question

我正在尝试创建一个实质上包裹了mat-expansion-panel的组件。 请参阅以下代码： https://stackblitz.com/edit/angular-issue-repro2-4wcj9i

但是它给了我“没有MatExpansionPanel的提供者” 尽管我指定了viewProviders：[MatExpansionPanel] 有什么想法吗？

Answer 1

I fixed the initial issue by adding

viewProviders: [MatExpansionPanel]

to the expansion-panel-header.component.ts

There is still an issue but I will post a separate question for this.