本文介绍了如何让一个变量的值跟踪另一个变量的值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
这是我现在所拥有的一个非常简化的示例:
Here's a very simplified example of what I have now:
public static class Settings
{
public static TH th;
}
public partial class PhrasesFrame
{
private void SetC1Btn()
{
var a = (int)Settings.th;
vm.C1BtnLabelTextColor = phrase.C1 == true ?
Styles.A[(int)Settings.th] :
Styles.A[(int)Settings.th];
}
我想将其替换为:
public partial class PhrasesFrame
{
// The value of Settings.th can change at any time
// I want the value of id to change when the
// value of (int)Setting.th changes. The way
// it's coded now I realize it's just a one
// time assignment
var id = (int)Settings.th;
private void SetC1Btn()
{
var a = (int)Settings.th;
vm.C1BtnLabelTextColor = phrase.C1 == true ?
Styles.A[id] :
Styles.A[id];
}
推荐答案
这个 Settings
类实现了一个自定义的 EventHandler
(SettingsChangedEventHandler
),使用将属性更改通知其订阅者:
您可以设置一个更复杂的自定义 SettingsEventArgs
来传递不同的值.
This Settings
class implements a custom EventHandler
(SettingsChangedEventHandler
), used to notify a property change to its subscribers:
You could setup a more complex custom SettingsEventArgs
to pass on different values.
更改公共 THProperty
属性值会引发事件:
Changing the public THProperty
property value raises the event:
public static class Settings
{
public delegate void SettingsChangedEventHandler(object sender, SettingsEventArgs e);
public static event SettingsChangedEventHandler SettingsChanged;
private static TH th;
private static int m_Other;
public class SettingsEventArgs : EventArgs
{
public SettingsEventArgs(TH m_v) => THValue = m_v;
public TH THValue { get; private set; }
public int Other => m_Other;
}
public static void OnSettingsChanged(SettingsEventArgs e) =>
SettingsChanged?.Invoke("Settings", e);
public static TH THProperty
{
get => th;
set { th = value; OnSettingsChanged(new SettingsEventArgs(th)); }
}
}
PhrasesFrame
类可以像往常一样订阅事件:
The PhrasesFrame
class can subscribe the event as usual:
public partial class PhrasesFrame
{
private TH id;
public PhrasesFrame()
{
Settings.SettingsChanged += this.SettingsChanged;
}
private void SetC1Btn()
{
var a = (int)this.id;
//Other operations
}
private void SettingsChanged(object sender, Settings.SettingsEventArgs e)
{
this.id = e.THValue;
SetC1Btn();
}
}
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