将 C# 中的变量数据绑定到 WPF 应用程序中的文本块不起作用
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Databinding a variable in C# to a textblock in a WPF application not working
提问by ocajian
XAML, C# novice and am struggling to databind a variable defined in my code behind to a textblock defined in XAML. But I get not result.
XAML、C# 新手，并且正在努力将我的代码中定义的变量数据绑定到 XAML 中定义的文本块。但我没有得到结果。
Here is my XAML
这是我的 XAML
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
Loaded="Window_Loaded_1">
<Grid>
<TextBlock Name="totalRecording">
<Run Text="44 /"/>
<Run Text="{Binding Source=listlength, Path=totalRecording}"/>
</TextBlock>
</Grid>
Here is my code behind
这是我的代码
namespace WpfApplication1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded_1(object sender, RoutedEventArgs e)
{
var listlength = 100;
}
}
}
For now I have just set the variable to a static number for the purposes of illustrating my problem but this variable will be obtained from a list Count value.
现在，为了说明我的问题，我只是将变量设置为静态数字，但该变量将从列表 Count 值中获取。
回答by Heena Patil
For binding you need to use Propertyonly .you cannot use varibale for binding.
对于绑定，您只需要使用Property 。您不能使用变量进行绑定。
To create property I create a class
要创建属性，我创建了一个类
public class TextboxText
{
public string textdata { get; set; }
}
And set datacontext to textblock so that I can use this property for binding
并将 datacontext 设置为 textblock 以便我可以使用此属性进行绑定
InitializeComponent();
totalRecording.DataContext = new TextboxText() { textdata = "100" };
in xaml
在 xml 中
<Grid Height="300" Width="400" Background="Red">
<TextBlock Name="totalRecording">
<Run Text="44 /"/>
<Run Text="{Binding textdata}"/>
</TextBlock>
</Grid
回答by Linkinbikzit
If you want to updatethe Binding, you should use a DependencyProperty.
如果要更新绑定，则应使用DependencyProperty。
First you have to create the propertyand a public stringlike this:
首先，您必须像这样创建属性和公共字符串：
public static readonly DependencyProperty ListLengthProperty =
DependencyProperty.Register("ListLength", typeof(string), typeof(Window), new PropertyMetadata(null));
public string ListLength
{
get { return (string)GetValue(ListLengthProperty); }
set { SetValue(ListLengthProperty, value); }
}
Here is the XAMLfile, you need to set a namefor the window:
这是XAML文件，您需要为窗口设置一个名称：
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Name="CurrentWindow"
Title="MainWindow" Height="350" Width="525"
Loaded="Window_Loaded_1">
<Grid>
<TextBlock Name="totalRecording">
<Run Text="44 /"/>
<Run Text="{Binding ListLength, ElementName=CurrentWindow}"/>
</TextBlock>
</Grid>
Now you can always update the Binding by setting the ListLengthlike this:
现在，您始终可以通过像这样设置ListLength来更新绑定：
ListLength = "100";
回答by Sajeetharan
Just use TextBlock,
只需使用TextBlock，
<Grid Name="myGrid" Height="437.274">
<TextBox Text="{Binding Path=listlength}"/>
</Grid>
Declare the variable and Implement InotifyPropertyChanged
声明变量并实现 InotifyPropertyChanged
partial class Window1 : Window, INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private string _listlength;
public string Listlength
{
get { return _listlength; }
set
{
if (value != _listlength)
{
_listlength = value;
OnPropertyChanged("Listlength");
}
}
}
}
