Question

我需要从botframework中的WaterfallStep中写入CosmosDB，如何注入依赖项，WaterfallStep是静态委托。

谢谢

Answer 1

您可以通过构造函数注入来注入DbContext。

注册DbContext

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContext<ApplicationDbContext>(option =>
        option.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
    //your rest code
}

注入DbContext

public class MultiTurnPromptsBot : IBot
{
    private readonly ApplicationDbContext _context;
    private const string WelcomeText = "Welcome to MultiTurnPromptBot. This bot will introduce multiple turns using prompts.  Type anything to get started.";

    private readonly MultiTurnPromptsBotAccessors _accessors;

    private DialogSet _dialogs;

    public MultiTurnPromptsBot(
        MultiTurnPromptsBotAccessors accessors
        , ApplicationDbContext context)
    {
        _accessors = accessors ?? throw new ArgumentNullException(nameof(accessors));
        _context = context;
        // The DialogSet needs a DialogState accessor, it will call it when it has a turn context.
        _dialogs = new DialogSet(accessors.ConversationDialogState);

        // This array defines how the Waterfall will execute.
        var waterfallSteps = new WaterfallStep[]
        {
            NameStepAsync,
            NameConfirmStepAsync,
        };

        // Add named dialogs to the DialogSet. These names are saved in the dialog state.
        _dialogs.Add(new WaterfallDialog("details", waterfallSteps));
        _dialogs.Add(new TextPrompt("name"));
    }        


    private async Task<DialogTurnResult> NameConfirmStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
    {
        // Get the current profile object from user state.
        var userProfile = await _accessors.UserProfile.GetAsync(stepContext.Context, () => new UserProfile(), cancellationToken);

        // Update the profile.
        userProfile.Name = (string)stepContext.Result;
        _context.Add(new User { Name = userProfile.Name });
        _context.SaveChanges();
        // We can send messages to the user at any point in the WaterfallStep.
        await stepContext.Context.SendActivityAsync(MessageFactory.Text($"Thanks {stepContext.Result}."), cancellationToken);

        // WaterfallStep always finishes with the end of the Waterfall or with another dialog; here it is a Prompt Dialog.
        return await stepContext.PromptAsync("confirm", new PromptOptions { Prompt = MessageFactory.Text("Would you like to give your age?") }, cancellationToken);
    }        
}

如何在Botframework中向瀑布步注入依赖性

1 个答案: