如何从 HttpClient 帮助程序 class 读取配置数据

Question

In my Blazor Server Application, I'm trying to read configuration data from appsettings.json from within a helper class that is used for configuring an HttpClient service to call a web API. 在我的Program.cs文件中，我将HttpClient服务添加为：

builder.Services.AddHttpClient<MyHelper>();

我需要访问我的 Helper class 里面的 App 配置，如下：

public class MyHelper
{
    private readonly HttpClient _httpClient;

    public MyHelper(HttpClient httpClient)
    {
        _httpClient = httpClient;    
       
        _httpClient.DefaultRequestHeaders.Add(
            HeaderNames.ContentType, "application/json");

        //Read configuration from appsettings.json

        );    
    }
}

谢谢你。

Answer 1

您可以注入IConfiguration以访问appsettings.json内容。

public class MyHelper
{
    private readonly HttpClient _httpClient;

    public MyHelper(HttpClient httpClient,IConfiguration configuration)
    {
        _httpClient = httpClient;

       
        _httpClient.DefaultRequestHeaders.Add(HeaderNames.ContentType, "application/json");

        //Read configuration from appsettings.json
        
        var connection=  configuration["connectionString"];
    }
}