英文:
How to access an injected service in parent component from child
问题
在子组件中，您可以通过继承 ParentComponent 来访问和使用 Http 对象。由于子组件继承自父组件，它会继承父组件中的字段和属性，包括 Http 对象。您可以像在父组件中一样在子组件中访问和使用 Http 对象，无需额外的配置或操作。
英文:
Consider the following code to be in ParentComponent.razor:
@inject HttpClient Http
<h1>Parent</h1>
@code{
protected override async Task OnInitializedAsync()
{
Http.DefaultRequestHeaders.Add("test", "true");
}
}
and ChildComponent.razor:
@inherits ParentComponent
<h1>Child</h1>
@code{
}
How can I access and use Http object in the child component?
答案1
得分: 2
You need to inject the service from @code to make it accessible for inheriting components.
<h1>Parent</h1>
@code{
[Inject]
public HttpClient Http { get; set; } = default!;
protected override async Task OnInitializedAsync()
{
Http.DefaultRequestHeaders.Add("test", "true");
}
}
Use base to access it.
@inherits ParentComponent
<h1>Child</h1>
@code{
private void DoSomething(){
System.Uri baseAddress = base.Http.BaseAddress;
}
}
英文:
You need to inject the service from @code to make it accessible for inheriting components.
<h1>Parent</h1>
@code{
[Inject]
public HttpClient Http { get; set; } = default!;
protected override async Task OnInitializedAsync()
{
Http.DefaultRequestHeaders.Add("test", "true");
}
}
Use base to access it.
@inherits ParentComponent
<h1>Child</h1>
@code{
private void DoSomething(){
System.Uri baseAddress = base.Http.BaseAddress;
}
}
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