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在我的代码中的PluginManager事件PluginEvent被触发后已添加插件。但是我想让事件也在测试类中触发。不知怎么的，我解决不了这个问题。该事件仅在PluginManager类中触发。我读了一些如何创建事件之类的文章，但我更困惑了
<
PluginManager类/strong>
public class PluginEventArgs
{
public PluginEventArgs(string s) { Text = s; }
public String Text { get; private set; } // readonly
}
public class PluginManager
{
// Declare the delegate (if using non-generic pattern).
public delegate void PluginEventHandler(object sender, PluginEventArgs e);
// Declare the event.
public event PluginEventHandler PluginEvent;
protected virtual void RaiseSampleEvent(string message)
{
if (PluginEvent != null)
PluginEvent(this, new PluginEventArgs(message));
}
public PluginManager()
{
PluginEvent += PluginManager_PluginEvent;
SomeMethod();
}
void PluginManager_PluginEvent(object sender, PluginEventArgs e)
{
//This event gets triggered =)
}
public void SomeMethod()
{
//Code
RaiseSampleEvent("Name of the Plugin");
//Code
}
}
测试类:
class test
{
public test()
{
PluginManager pluginMg = new PluginManager();
pluginMg.PluginEvent += pluginMg_PluginEvent;
}
//I want this event to get triggered when a new plugin has been found
void pluginMg_PluginEvent(object sender, PluginEventArgs e)
{
MessageBox.Show(e.Text);
}
}
我怎样才能在测试类中触发事件?谢谢你的建议!
除了一个逻辑错误，你实际上做得很对。
在你的测试类中，你使用构造函数创建PluginManager。PluginManager的构造函数首先订阅事件，然后引发事件。
之后你将订阅那个事件。
简单的问题是，当您引发事件时，您的测试类尚未订阅。当您再次触发该事件时，一切都会正常运行。
另一件事是，我将使用通用的EventHandler类，而不是创建自己的委托。这使你的代码更干净，每个人都知道这意味着一个事件的第一眼。
从EventArgs中继承PlugInEventArgs，然后使用eventandler。
在你的PluginManager类中，你不应该订阅你自己的事件PluginEvent，你应该订阅一个外部事件或者只是引发PluginEvent。让我给你一个例子:
public class PluginEventArgs
{
public PluginEventArgs(string s) { Text = s; }
public String Text { get; private set; } // readonly
}
public class OtherClass
{
public event PluginEventHandler PluginEvent;
private void RaiseEvent()
{
if (null != PluginEvent)
PluginEvent(this, new PluginEventArgs("some message"));
}
}
public delegate void PluginEventHandler(object sender, PluginEventArgs e);
public class PluginManager
{
public event PluginEventHandler PluginEvent;
private OtherClass otherClass;
protected virtual void RaiseSampleEvent(string message)
{
if (PluginEvent != null)
PluginEvent(this, new PluginEventArgs(message));
}
public PluginManager(OtherClass otherClass)
{
this.otherClass = otherClass;
this.otherClass.PluginEvent += otherClass_PluginEvent;
SomeMethod();
}
void otherClass_PluginEvent(object sender, PluginEventArgs e)
{
if (PluginEvent != null)
PluginEvent(sender, e); // this way the original sender and args are transferred.
}
public void SomeMethod()
{
//Code
RaiseSampleEvent("Name of the Plugin");
//Code
}
}
class test
{
public test()
{
OtherClass otherClass = new OtherClass();
PluginManager pluginMg = new PluginManager(otherClass);
pluginMg.PluginEvent += pluginMg_PluginEvent;
}
//I want this event to get triggered when a new plugin has been found
void pluginMg_PluginEvent(object sender, PluginEventArgs e)
{
MessageBox.Show(e.Text);
}
}