除非选中，否则数据绑定文本框不会更新 [英] databound textbox not updating unless selected

问题描述

我有一个静态单例类，该类具有用于将文本框数据绑定到的属性。

I have a static singleton class with properties I use to databind textboxes to.

using System.ComponentModel;

namespace Masca
{
    public class logged : INotifyPropertyChanged
    {    
        public static logged instance = new logged();
        public static logged Instance
        {
            get { return instance; }
        }

        private string alisa;
        public string aliasname
        {
            get { return alisa; }
            set
            {
                alisa = value;
                RaisePropertyChanged("aliasname");
            }
        }

        private string mail;
        public string emailadd
        {
            get { return mail; }
            set
            {
                mail = value;
                RaisePropertyChanged("emailadd");
            }
        }

        private void RaisePropertyChanged(string prop)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged (this, new PropertyChangedEventArgs(prop));
            }
        }
        public event PropertyChangedEventHandler PropertyChanged;
    }
}

这是属性访问方法：

loggedin.Instance.emailadd = "email.text";

这是我放置在我希望访问该属性的所有其他页面的Initialize组件中的数据上下文：

This is the datacontext I place in the initialize components of all other pages I wish to access the property:

DataContext = loggedin.Instance;

这是绑定文本框的XAML代码

and this is the XAML code for a bound TextBox

<TextBox x:Name="email" Text="{Binding emailadd}" Height="19" VerticalAlignment="Top" HorizontalAlignment="Left" Width="211" FontSize="11" Margin="134,417,0,0"/>

<TextBox x:Name="mail" Text="{Binding emailadd}" Height="19" VerticalAlignment="Top" HorizontalAlignment="Left" Width="211" FontSize="11" Margin="134,435,0,0"/>

问题是，如果我在email.text中键入内容，mail.text将仅反映

The problem is that if I type something into email.text, mail.text will only reflect what is in email.text once i have clicked in mail.text.

非常感谢您的帮助。

推荐答案

尝试设置 UpdateSouceTrigger ：

<TextBox x:Name="email" Text="{Binding emailadd, 
                               UpdateSourceTrigger=PropertyChanged, 
                               Mode=TwoWay}" />

请注意， UpdateSourceTrigger 的默认值 TextBox.Text 是 LostFocus ，而对于其他许多属性，它是 PropertyChanged 。

Note that the default value of UpdateSourceTrigger for a TextBox.Text is LostFocus, while for many other properties, it is PropertyChanged.

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