Question

我正在尝试为自定义的textBox实现ViewModel，这是我第一次尝试以this tutorial的方式执行ViewModel。

它是一个文件浏览器应用程序，只需要一个string address;（不是集合），它包含自定义TextBox“ExploreAddress”的地址。
这个自定义TextBox有文本和图像（当前的图标）目录，它不是静态的）

enter image description here

public class ExploreAddressVM : INotifyPropertyChanged
{
    private string _text;
    private System.Windows.Media.ImageSource _image;

    public string Text
    {
        get { return _text; }
        set { _text = value; }
    }
    public System.Windows.Media.ImageSource Image
    {
        get { return _image; }
        set { _image = value; }
    }

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

XAML：

<UserControl.DataContext>

    <l:ExploreAddressViewModel/>

</UserControl.DataContext>

<TextBox x:Name="txtAddress" Margin="34,5,32,0" TextWrapping="Wrap" 
Text="{Binding Name}" Height="25"
VerticalAlignment="Top" FontWeight="Bold" MinHeight="25" MaxHeight="25">
            <TextBox.Background>
                <ImageBrush ImageSource="{Binding Image}" Stretch="None"/>
            </TextBox.Background>
        </TextBox>

这是将ViewModel与自定义TextBox

绑定的理想解决方案

代码背后：

 private void UserControl_Loaded(object sender, RoutedEventArgs e)
    {
        exploreAddress = (ExploreAddressViewModel)base.DataContext;
        exploreAddress.Text = "My Computer";
    }
    private void GoButton_Click(object sender, RoutedEventArgs e)
    {
        MessageBox.Show(txtAddress.Text); 
    }

Answer 1

我实际上不确定为什么我需要创建一个类 ExploreAddress，也许我可以把它放在同一个地方 ExploreAddressViewModel类

你不需要。

你有重复的内容，只需删除该类。

此外，您的属性设置者必须提升PropertyChanged事件，如下所示：

public class ExploreAddressViewModel : INotifyPropertyChanged
{
    private string _name
    public string Name
    {
        get { return _name; }
        set 
        { 
            _name = value;
            RaisePropertyChanged("Name");
        }
    }

    private ImageSource _image;
    public ImageSource Image
    {
        get { return _image; }
        set 
        { 
             _image = value; 
            RaisePropertyChanged("Image");
        }
    }

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

带有ViewModel的WPF TextBox

1 个答案: