如何制定正确的ApplicationDbContext生命周期

Question

当我执行一个方法时，在发出外部 HttpClient 请求后，我的

ApplicationDbContext

生命周期结束了，如何使这个方法正确？

方法

    public async Task ConfirmEmail(int userId, Guid codeFromUser)
    {
        var user = _accountAccessor.GetUserById(userId);
        
        if (user.EmailConfirmed) throw new BadRequestException("Email already verified");

        // Getting Confirmation Code        
        var confirmationCode = await ResponseHelper.GetResponseAsync(_httpClientFactory, $"{ServiceUrlVariables.ConfirmationCodeApi}/GetCodeByUserId/{userId}");
        var confirmationCodeDto = await ResponseHelper.DeserializeResponseAsync<ConfirmationCodeDto>(confirmationCode);

        // validation
        if (confirmationCodeDto.ExpiresAt < DateTime.UtcNow) throw new BadRequestException("Code expired");
        if (confirmationCodeDto.Code != codeFromUser) throw new BadRequestException("Your code is wrong");
        
        // setting `EmailConfirmed == true`
        user.EmailConfirmed = true;
        _accountAccessor.UpdateUser(user);

        var codeId = confirmationCodeDto.Id;
        // Deleting ConfirmationCode from Db, cuz it's already verified
        await ResponseHelper.DeleteResponseAsync(_httpClientFactory, $"{ServiceUrlVariables.ConfirmationCodeApi}/DeleteConfirmationCodeById/{codeId}");
    }

响应助手

    public static async Task<HttpResponseMessage> GetResponseAsync(IHttpClientFactory httpClientFactory, string requestUri)
    {
        using var client = httpClientFactory.CreateClient();
        var response = await client.GetAsync(requestUri).ConfigureAwait(false);
        
        response.EnsureSuccessStatusCode();
        
        return response;
    }

节目

builder.Services.AddDbContext<ApplicationDbContext>(options => options.UseNpgsql(
    ConnectionStringsVariables.BookShopDB
));

我是新手，对我来说有点难以理解如何修复此类错误。

如果我的理解是正确的，异步请求的寿命超出了我的 dbcontext 的范围

Answer 1

嗯，你可以做这样的事情，取决于哪种生命周期更适合你的环境：

services.AddDbContext<ApplicationDbContext>(options =>
        {
            options.UseNpgsql(ConnectionStringsVariables.BookShopDB);
            
        }, contextLifetime: ServiceLifetime.Transient, optionsLifetime: ServiceLifetime.Transient);

了解更多信息：https://learn.microsoft.com/en-us/ef/core/dbcontext-configuration/

如果您想了解其中每一项的工作原理，请查看此处： https://learn.microsoft.com/en-us/aspnet/core/fundamentals/dependency-injection?view=aspnetcore-8.0

如果我没有回答正确，很乐意回答其他问题:)