c# – 如何将数据传递到MonoTouch.Dialog的代理？

给定以下代码,如何将“First Name”,“Last Name”等数据传递给我的方法BookASession.SendMessage();?

RootElement CreateBookASessionRoot() 
{
    return new RootElement("Book a Session") {
        new Section() {
            new EntryElement("First Name", "First Name", ""),
            new EntryElement("Last Name", "Last Name", ""),
            new EntryElement("Email", "Email", "") { KeyboardType = UIKeyboardType.EmailAddress },
            new DateElement("Event Date", DateTime.Now),
            new RootElement ("Type of Shoot", new RadioGroup (0)){
                    new Section (){
                        new RadioElement("Wedding"),
                    new RadioElement("Portrait"),
                    new RadioElement("Boudoir"),
                    new RadioElement("Other")
                    }
            } ,
            new EntryElement("Message", "Message", "")
        } ,
        new Section () {
            new StringElement("Send", delegate { BookASession.SendMessage(); } )
        }
    };                      
}       

解决方法:

我想要实现这一点的方法是保持对我的输入元素的引用.通过这种方式,我可以轻松获取其输入值,而无需搜索整个元素树.我是通过将特定屏幕的创建逻辑封装在一个单独的clase中来实现的,如下所示：

public class BookASessionScreen
{
    private RootElement _root = null;

    private EntryElement _firstName = null;

    private EntryElement _lastName = null;

    private EntryElement _email = null;

    private DateElement _date = null;

    private RootElement _typeOfShoot = null;

    private EntryElement _message = null;

    private void CreateRoot()
    {
        _firstName = new EntryElement("First Name", "First Name", "");
        _lastName = _firstName = new EntryElement("First Name", "First Name", "");
        _email = new EntryElement("Email", "Email", "") { KeyboardType = UIKeyboardType.EmailAddress };
        _date = new DateElement("Event Date", DateTime.Now);
        _typeOfShoot = new RootElement ("Type of Shoot", new RadioGroup (0)){
            new Section () {
                new RadioElement("Wedding"),
                new RadioElement("Portrait"),
                new RadioElement("Boudoir"),
                new RadioElement("Other")
            }
        };
        _message = new EntryElement("Message", "Message", "");

        _root = new RootElement("Book a Session") {
            new Section() {
                _firstName,
                _lastName,
                _email,
                _date,
                _typeOfShoot,
                _message
            } ,
            new Section () {
                new StringElement("Send", delegate { 
                    //BookASession.SendMessage(_firstName.Value, _lastName.Value, ...)
                })
            }
        };
    }

    public RootElement Root 
    {
        get {
            if (_root == null) {
                CreateRoot();
            }
            return _root;
        }
    }
}

此外,您可能希望通过让类公开事件来解耦表单处理逻辑,如下所示：

1 – 创建一个包含事件数据的类,扩展EventArgs：

public class BookASessionArgs : EventArgs
{
    public string FirstName
    {
        get;
        set;
    }

    public string LastName
    {
        get;
        set;
    }

    public string Email
    {
        get;
        set;
    }
}

2 – 在BookASessionScreen中声明您的事件：

public event EventHandler BookASession;

3 – 在您的代表中触发事件

if (BookASession != null) {
    BookASession(this, new BookASessionArgs() {
        FirstName = _firstName.Value,
        LastName = _lastName.Value
        //..
    });
}

标签：c,ios,xamarin-ios,monotouch-dialog
来源： https://codeday.me/bug/20190610/1208995.html