WPF TextBox.Text 返回默认值

Question

I'm making a small application using .NET Core 6 WPF. I'm trying to get user input from a TextBox, but it returns a value I set through XAML. This is how I declare a TextBox:

<TextBox Name="TaskTextBox" Margin="0, 0, 0, 20" Text="Task" Style="{StaticResource InputFieldStyle}"/>
<Button 
    Name="SaveButton"
    Click="SaveButton_OnClick"
    Style="{StaticResource HomeTaskEditButtonStyle}"
    Background="#5abf26"
    HorizontalAlignment="Left"
    Width="100">
       <TextBlock
            Text="Save"
            Foreground="White"
            FontSize="20"/>
</Button>

And here is how I try to get the input:

private void SaveButton_OnClick(object sender, RoutedEventArgs e)
{
    var taskText = TaskTextBox.Text; // Returns "Task", But I entered "Test"
    var lessonText = LessonTextBox.Text;
        
    // Next Logic
}

And here is my TextBox Style:

    <Style x:Key="InputFieldStyle" TargetType="TextBox">
        <Setter Property="OverridesDefaultStyle" Value="True"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="TextBox">
                    <Border
                        CornerRadius="10"
                        Background="#464646"
                        Padding="5">
                        <TextBox
                            Text="{TemplateBinding Text}"
                            FontSize="16"
                            Margin="1"
                            BorderThickness="0"
                            Background="Transparent"
                            Padding="5"
                            Foreground="White"
                            TextWrapping="WrapWithOverflow"
                            CaretBrush="White"/>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

I request TaskTextBox.Text when the button is pressed.

I don't know how to fix this.

Answer 1

When dealing with dates, use date properties on whatever your binding source. Same with other data types like int, decimal, float, etc. If you set the textbox control to a binding of a specific type, or a date picker control to a date field respectively, YOU dont have to worry as much about a valid value or type conversion.

So, on your underlying binding source DATACONTEXT, have a property like

public DateTime myDate { get; set;}

Then, in have a DatePicker control and bind the SelectedDate to the date property exposed. Then you get built-in calendar style features, can do black-out dates, and more.