[英]Xaml DateTime binding
我像這樣在TextBlock中綁定DateTime:
<TextBlock
HorizontalAlignment="Center"
Text="{
Binding Source={x:Static sys:DateTime.Today},
StringFormat='{}{0:dddd, MMMM dd, yyyy}'
}"
/>
有沒有辦法做同樣的綁定,但要綁定過去的10天而不是今天的日期?
添加一個靜態類,如下所示:
namespace MyWpfApplication
{
public static class MyDateTime
{
public static DateTime TenDaysAgo => System.DateTime.Now.AddDays(-10);
}
}
然后在您的XAML中使用它(不要忘記添加xml命名空間):
<Window x:Class="MyWpfApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:MyWpfApplication">
<TextBlock
HorizontalAlignment="Center"
Text="{
Binding Source={x:Static local:MyDateTime.TenDaysAgo},
StringFormat='{}{0:dddd, MMMM dd, yyyy}'
}"
/>
</Window>
實際上,只有在ObjectDataProvider的幫助下,您才能在XAML中執行此操作。 請參閱: https : //docs.microsoft.com/zh-cn/dotnet/framework/wpf/data/how-to-bind-to-a-method
<StackPanel>
<StackPanel.Resources>
<ObjectDataProvider x:Key="tod" ObjectInstance="{x:Static sys:DateTime.Today}" MethodName="AddDays">
<ObjectDataProvider.MethodParameters>
<sys:Int32>-10</sys:Int32>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
</StackPanel.Resources>
<TextBlock HorizontalAlignment="Center" Text="{Binding Source={StaticResource tod}, StringFormat='{}{0:dddd, MMMM dd, yyyy}'}"/>
</StackPanel>
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