当我尝试注入 HttpClient 时，我在 razor 页面中收到错误：
未处理的承诺拒绝：错误：System.InvalidOperationException：
无法为类型上的属性“Http”提供值。没有
类型为“System.Net.Http.HttpClient”的注册服务。
请审查并提供反馈。
如果您给出您想要执行的操作的代码片段，那么回答您的问题会更容易。但是没问题。现在我将向您展示一个示例，您必须做什么，才能使用 DI 注入服务。
ChartDataService.cs
namespace MyBlazorApp.Services
{
public class ChartDataService: IChartDataService
{
public HttpClient httpClient;
public ChartDataService(HttpClient httpClient)
{
this.httpClient = httpClient;
}
public async Task < IEnumerable < ChartData >> GetChartData()
{
return await httpClient.GetJsonAsync < ChartData[] > ($ "myUri");
}
}
}
IChartDataService.cs
namespace MyBlazorApp.Services
{
public interface IChartDataService
{
Task < IEnumerable < ChartData >> GetChartData();
}
}
Startup.cs
// other
public void ConfigureServices(IServiceCollection services)
{
services.AddRazorPages();
services.AddServerSideBlazor();
// some services
services.AddHttpClient < IChartDataService, ChartDataService > (client =>
{
client.BaseAddress = new Uri(myBaseUri);
});
}
MyRazorPage.razor.cs (when using code Behind)
[Inject] private IChartDataService ChartDataService { get; set; }
or in
MyRazorPage.razor
@code
{
[Inject] private IChartDataService ChartDataService { get; set; }
}
then in your code - block or code - behind file u can use something like this,
for example, in an async function..
protected override async Task OnInitializedAsync()
{
chartData = await ChartDataService.MakeChartData();
}
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