C# 如何从后面的代码刷新自定义 wpf 用户控件？
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How can I refresh a custom wpf user control from code behind?
提问by Edward Tanguay
I have this custom wpf user control:
我有这个自定义 wpf 用户控件：
ShowCustomer.xaml:
ShowCustomer.xaml：
<UserControl x:Class="TestControlUpdate2343.Controls.ShowCustomer"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Grid>
<TextBlock Text="{Binding Message}"/>
</Grid>
</UserControl>
ShowCustomer.xaml.cs:
ShowCustomer.xaml.cs：
using System.Windows.Controls;
using System;
using System.ComponentModel;
namespace TestControlUpdate2343.Controls
{
public partial class ShowCustomer : UserControl, INotifyPropertyChanged
{
#region ViewModelProperty: Message
private string _message;
public string Message
{
get
{
return _message;
}
set
{
_message = value;
OnPropertyChanged("Message");
}
}
#endregion
public ShowCustomer()
{
InitializeComponent();
DataContext = this;
Message = "showing test customer at: " + DateTime.Now.ToString();
}
#region INotifiedProperty Block
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
And I display it from this XAML:
我从这个 XAML 显示它：
Window1.xaml:
Window1.xaml：
<Window x:Class="TestControlUpdate2343.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:TestControlUpdate2343.Controls"
Title="Window1" Height="300" Width="300">
<StackPanel HorizontalAlignment="Left" Margin="10">
<controls:ShowCustomer x:Name="ShowCustomerControl" Margin="0 0 0 10"/>
<Button Content="Refresh Control"
Click="Button_RefreshControls_Click"
Margin="0 0 0 10"/>
</StackPanel>
</Window>
And I would like to update the control (i.e. in this example show the current time) from my event handler in code behind:
我想从后面的代码中的事件处理程序更新控件（即在此示例中显示当前时间）：
using System.Windows;
namespace TestControlUpdate2343
{
public partial class Window1 : Window
{
public Window1()
{
InitializeComponent();
}
private void Button_RefreshControls_Click(object sender, RoutedEventArgs e)
{
//ShowCustomerControl.Refresh()???
}
}
}
How can I force a refresh of my custom control from code behind, or force it to reload somehow so when I click the button it shows the current time?
如何从后面的代码强制刷新我的自定义控件，或者强制它以某种方式重新加载，以便在单击按钮时显示当前时间？
采纳答案by viky
in Window1.xaml.cs -
在 Window1.xaml.cs 中 -
private void Button_RefreshControls_Click(object sender, RoutedEventArgs e)
{
ShowCustomerControl.Refresh();
}
in ShowCustomer.xaml.cs -
在 ShowCustomer.xaml.cs 中 -
public ShowCustomer()
{
InitializeComponent();
DataContext = this;
Refresh();
}
public void Refresh()
{
Message = "showing test customer at: " + DateTime.Now.ToString();
}
Hope this helps!!
希望这可以帮助！！
回答by Rich257
Or have a LastUpdate property on ShowWindow and set that, which then regenerates the Message property.
或者在 ShowWindow 上有一个 LastUpdate 属性并设置它，然后重新生成 Message 属性。
