wpf，如何绑定当前日期？
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wpf,How to bind Current Date?
提问by doull
I have a TextBlock control to which I would like to bind current System Date , how can I do that by Code Behind ?
我有一个 TextBlock 控件，我想将当前的 System Date 绑定到该控件，我如何通过代码隐藏来做到这一点？
The goal is to display in this TecBlock the current System Date and Time and I do not need the control refresh all the time ,only once.
目标是在此 TecBlock 中显示当前系统日期和时间，并且我不需要一直刷新控件，只需要刷新一次。
I hope that is most simple Code.I don't want to Create dateTime Property. follow is my code:it is Wrong that it can't find BindSource
我希望这是最简单的代码。我不想创建 dateTime 属性。以下是我的代码：它找不到 BindSource 是错误的
Binding bd = new Binding("System.DateTime.Now");
bd.Source = this;
textBox.SetBinding(TextBox.TextProperty, bd);
Thanks for help
感谢帮助
回答by Kishore Kumar
This will show the Current date only once .
这将只显示当前日期一次。
create a namespace alias:
创建命名空间别名：
xmlns:sys="clr-namespace:System;assembly=mscorlib"
<TextBlock Text="{Binding Source={x:Static sys:DateTime.Today},
StringFormat='{}{0:dddd, MMMM dd, yyyy}'}"/>
回答by BrokenGlass
Well technically speaking you could bind the current time as in the sample below, but without a proper binding as SLaks mentioned you won't be able to refresh it at all.
从技术上讲，您可以像下面的示例一样绑定当前时间，但是如果没有正确的绑定，正如 SLaks 提到的那样，您将根本无法刷新它。
<Window x:Class="testWPF.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:src="clr-namespace:System;assembly=mscorlib"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<ObjectDataProvider x:Key="date" ObjectType="{x:Type src:DateTime}"/>
</Window.Resources>
<Grid>
<TextBox Text="{Binding Source={StaticResource date},
Path=Now, Mode=OneWay}" />
</Grid>
</Window>
回答by SLaks
You cannot bind to a static property.
您不能绑定到静态属性。
You need to create a class with a property that returns DateTime.Now, and raise the PropertyChangedevent either every day or every second. (using a timer)
您需要创建一个具有返回属性的类DateTime.Now，并PropertyChanged每天或每秒引发事件。（使用定时器）
回答by biju
I think you are looking to do this in code behind.Create a Property of the in your class and set binding to that property
我认为您希望在后面的代码中执行此操作。在您的类中创建一个属性并将绑定设置为该属性
public DateTime Date { get; set; }
public Window9()
{
InitializeComponent();
Date = DateTime.Now;
DataContext=this;
txt.SetBinding(TextBlock.TextProperty, new Binding("Date"));
}
