如何防止在确认提示中显示问题？

Question

我不希望在最后一次确认中显示一个问题

Answer 1

我可以想到三种方法来做到这一点。例如，我将使用具有FirstName，LastName和MiddleName的表单，其中MiddleName是要隐藏的字段。

选项1

您可以自定义确认步骤，以明确列出除一个字段之外的所有字段：

public static IForm<MyClass> BuildForm()
{
    var fieldNames = new[] { nameof(FirstName), nameof(MiddleName), nameof(LastName) };
    var confirmation = new StringBuilder("Is this your selection?");
    var formBuilder = new FormBuilder<MyClass>();

    foreach (var name in fieldNames)
    {
        // Add the field to the form
        formBuilder.Field(name);

        // Add the field to the confirmation prompt unless it's MiddleName
        if (name != nameof(MiddleName))
        {
            confirmation.AppendLine().Append($"* {{&{name}}}: {{{name}}}");
        }
    }

    formBuilder.Confirm(new PromptAttribute(confirmation.ToString()) {
        FieldCase = CaseNormalization.None
    });

    return formBuilder.Build();
}

这可能看起来有点复杂，但这只是一种更加动态的表达方式：

public static IForm<MyClass> BuildForm()
{
    var formBuilder = new FormBuilder<MyClass>()
        .Field(nameof(FirstName))
        .Field(nameof(MiddleName))
        .Field(nameof(LastName))
        .Confirm(new PromptAttribute("Is this your selection?\n* {&FirstName}: {FirstName}\n* {&LastName}: {LastName}") { FieldCase = CaseNormalization.None })
        ;

    return formBuilder.Build();
}

请注意，这使用了pattern language。

选项2

您可以在确认步骤中使字段无效。这有点棘手，因为您需要确保在所有其他步骤中该字段都处于活动状态。在我的示例中，这是通过为每个字段设置NextDelegate来实现的。在这种情况下，应将MiddleName标记为可选。

[Optional]
public string MiddleName { get; set; }

public static IForm<MyClass> BuildForm()
{
    NextDelegate<MyClass> next = (value, state) =>
    {
        // Make sure MiddleName is active during most steps
        state._isMiddleNameActive = true;
        return new NextStep();
    };

    var formBuilder = new FormBuilder<MyClass>()
        .Field(new FieldReflector<MyClass>(nameof(FirstName)).SetNext(next))
        .Field(new FieldReflector<MyClass>(nameof(MiddleName)).SetNext(next)
            .SetActive(state => state._isMiddleNameActive))
        .Field(new FieldReflector<MyClass>(nameof(LastName)).SetNext(next))
        ;

    formBuilder.Confirm(async state =>
        {
            // Make sure MiddleName is inactive during the confirmation step
            state._isMiddleNameActive = false;

            // Return the default confirmation prompt
            return new PromptAttribute(
                formBuilder.Configuration.Template(TemplateUsage.Confirmation));
        });

    return formBuilder.Build();
}

// This private field isn't included in the form but is accessible via the form's state
private bool _isMiddleNameActive;

选项3

您可以使用custom prompter。这有点先进，但可以为您提供最大的控制权。

public static IForm<MyClass> BuildForm()
{
    var formBuilder = new FormBuilder<MyClass>()
        .Prompter(PromptAsync)
        ;

    return formBuilder.Build();
}

/// <summary>
/// Here is the method we're using for the PromptAsyncDelgate.
/// </summary>
private static async Task<FormPrompt> PromptAsync(IDialogContext context,
    FormPrompt prompt, MyClass state, IField<MyClass> field)
{
    var preamble = context.MakeMessage();
    var promptMessage = context.MakeMessage();

    // Check to see if the form is on the confirmation step
    if (field.Name.StartsWith("confirmation"))
    {
        // If it's on the confirmation step,
        // we want to remove the MiddleName line from the text
        var lines = prompt.Prompt.Split('\n').ToList();
        var middleNameField = field.Form.Fields.Field(nameof(MiddleName));
        var format = new Prompter<MyClass>(
            middleNameField.Template(TemplateUsage.StatusFormat), field.Form, null);
        var middleNameLine = "* " + format.Prompt(state, middleNameField).Prompt;
        lines.RemoveAll(line => line.StartsWith(middleNameLine));
        prompt.Prompt = string.Join("\n", lines);
    }

    if (prompt.GenerateMessages(preamble, promptMessage))
    {
        await context.PostAsync(preamble);
    }

    await context.PostAsync(promptMessage);

    return prompt;
}