C# 数据绑定问题

我在将数据从TextBox绑定到ViewModel再绑定到TextBlock时遇到了一个主要问题。我设置了以下Xaml代码，如下所示：

<Page
x:Class="digiBottle.MainPage"
DataContext="{Binding Source=UserProfile}"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:digiBottle"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" 
      DataContext="{Binding Source=UserProfile}">

    <TextBlock HorizontalAlignment="Left" Margin="219,72,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="32" Width="232" Text="{Binding userFirstName, Mode=OneWay}"/>
    <TextBox HorizontalAlignment="Left" Margin="39,72,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="111" Text="{Binding userFirstName, UpdateSourceTrigger=PropertyChanged}"/>

</Grid>

{ 公共类UserProfile:INotifyPropertyChanged {

    public int ID { get; set; }
    public string userFirstName;
    public string userLastName { get; set; }
    public int age { get; set; }
    public int weight { get; set; }
    public int height { get; set; }
    public DateTime signupTime { get; set; }

    public event PropertyChangedEventHandler PropertyChanged;

    public UserProfile()
    {
        userFirstName = "First Name";
    }


    private void RaisePropertyChanged(string propertyName)
    {
        if (this.PropertyChanged != null)
        {
            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }

    }

    public UserProfile getCopy()
    {
        UserProfile copy = (UserProfile)this.MemberwiseClone();
        return copy;
        }
    }
}

在UserProfile.cs源文件中将我的TextBox和TextBlock绑定到userFirstName时，我做错了什么。任何帮助都将是主要帮助

---

谢谢

我注意到的第一件事是您的属性（setter）没有引发事件更改。您需要在属性setter中调用RaisePropertyChanged

我会像这样写的

私人场地

private String _userFirstName;

然后在构造函数中

 public UserProfile()
 {
      this._userFirstName = "First Name";
 }

与财产筹集活动

public String UserFirstName
{
     get { return this._userFirstName; }
     set  
     {
         this._userFirstName = value;
         this.RaisePropertyChanged("UserFirstName");
     }
}

然后在XAML中，通过双向绑定将其与属性“UserFirstName”绑定

<TextBlock HorizontalAlignment="Left" Margin="219,72,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="32" Width="232" Text="{Binding UserFirstName, Mode=OneWay}"/>
<TextBox HorizontalAlignment="Left" Margin="39,72,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="111" Text="{Binding UserFirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

---

开始时，数据绑定可能很难理解。请参阅开始

对于您的代码：以下是您需要的修复程序：

请记住，您只能绑定到属性

您需要在集合操作上引发事件

根据需要的操作，您可能需要对文本框进行双向绑定

您需要为textbox和textblock设置DataContext

以下是变化：

CS

XAML

这是Windows Phone的问题还是Windows 8的问题？这个答案也可以。：b两个很棒的建议。谢谢大家！哇，非常感谢你们，准备用这段代码试驾。它将解决我所有的问题！！！！你们太棒了！

<TextBlock HorizontalAlignment="Left" Margin="219,72,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Height="32" Width="232" Text="{Binding UserFirstName, Mode=OneWay}"/>
<TextBox HorizontalAlignment="Left" Margin="39,72,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="111" Text="{Binding UserFirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

public class UserProfile : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    string user_first_name;
    public String UserFirstName
    {
        get { return user_first_name; }
        set
        {
            user_first_name = value;
            OnPropertyChanged("UserFirstName");
        }
    }

    protected void OnPropertyChanged(string name)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(name));
        }
    }

}


public partial class MainPage : PhoneApplicationPage
{
    // Constructor
    public MainPage()
    {
        InitializeComponent();

        UserProfile up = new UserProfile();
        this.tb1.DataContext = up;
        this.tb2.DataContext = up;
    }
 }

<TextBlock x:Name="tb2" TextWrapping="Wrap" Text="{Binding UserFirstName}"/>
<TextBox x:Name="tb1" HorizontalAlignment="Left" Height="72" Margin="14,475,0,0" Grid.Row="1" TextWrapping="Wrap" Text="{Binding UserFirstName, Mode=TwoWay}" VerticalAlignment="Top" Width="456" />