XAML 为也可以更改的文本框设置初始值

Question

我的 XAML 中有一个显示当前工作目录的文本框。 XAML 代码如下所示：

<StackPanel x:Name="StackCurrentPath" Orientation="Vertical" Margin="25,25,25,5">
    <StackPanel Orientation="Horizontal" Margin="0,5,0,0">
        <TextBox materialDesign:HintAssist.Hint="Path of app*" materialDesign:HintAssist.HintOpacity="10" materialDesign:HintAssist.Background="White" materialDesign:ValidationAssist.Background="White" materialDesign:HintAssist.Foreground="#FF002655" Style="{StaticResource MaterialDesignOutlinedTextFieldTextBox}" x:Name="txtboxCurrentPath" Width="230" TextChanged="txtboxCurrentPath_TextChanged">
            <Binding Path="CurrentPath" UpdateSourceTrigger="PropertyChanged" Mode="TwoWay" Source="{StaticResource MyConfigurations}" >
                <Binding.ValidationRules>
                    <local:PathValidation ValidatesOnTargetUpdated="True"/>
                </Binding.ValidationRules>
            </Binding>
        </TextBox>
    </StackPanel>
</StackPanel>

后面的代码如下所示：

public partial class PathSection: Page
{
    private string currentDirectoryPath = System.AppDomain.CurrentDomain.BaseDirectory;
    public PathSection()
    {
        var currentDir = System.IO.Path.GetFullPath(System.IO.Path.Combine(currentDirectoryPath, @"..\Assets\"));
    }
    InitializeComponent();
    txtboxCurrentPath.Text = currentDir;

    private void txtboxCurrentPath_TextChanged(object sender, RoutedEventArgs e)
    {
        //some code here for binding the value to MyConfigurations.CurrentPath
    }
}

我试图做到这一点，最初，文本框应该自己显示路径，但用户仍然可以根据需要对其进行更改。我遇到的问题是，当我进行更改并导航回此页面时，组件会重新初始化并且用户更改的路径会被覆盖。我怎样才能使初始值本身就是当前路径，但是用户仍然可以更改并且当他们回来时它不会被覆盖？

Answer 1

改变

txtboxCurrentPath.Text = currentDir;

至

txtboxCurrentPath.Text = string.IsNullOrEmpty(MyConfigurations.CurrentPath) ? currentDir : MyConfigurations.CurrentPath;

但我认为你的设计不正确

XAML 为也可以更改的文本框设置初始值

XAML set an initial value for a textbox that can also be changed

c#

xaml