在C＃WinForms中提升自定义事件 [英] Raise custom events in C# WinForms

问题描述

我有一些我自己创建的活动，并且想知道如何在需要时提高它们。

可能我的应用程序设计也搞砸了，可能会

这是结构

  ProgramContext 
  -  Form MainWindow 
 +控件TextBox 
 +控件按钮
 + ... 
  

在这种情况下， MainWindow.TextBox 保存一些在运行时经常更新的信息。所以，我需要它来刷新自己，当我想（所以它可以从数据库中重新加载数据库，它存储在哪里）

我尝试挂钩一个code> EventHandler 到它的验证 -Event，但似乎没有这样做。

所以，基本上我有一个方法来重新加载 ProgramContext

  DataTable table = _adapter.GetData（）; 
 foreach（table.Rows中的DataRow行）
 {
 MainWindow.TextBox.Text + = table.Text.ToString（）; 
} 
  

只要有其他方法（将新数据写入<$执行c $ c>表）

任何想法？

解决方案

编辑：似乎你的问题更多的是关于一个特定的事件，但下面的FWIW是如何消除一般的常规事件。

处理TextBox更改事件

根据我的理解，您希望外部方监视Form上的文本框中引发的事件，然后在另一个表单上重新加载数据？

快速而肮脏的方式是使Form TextBox公开，然后其他人可以订阅此事件

  MainForm.textBox1.TextChanged + = new System.EventHandler（this.textBox1_TextChanged）; 
  

或者，在更新版本的C＃中：

MainForm.textBox1.TextChanged + = this.textBox1_TextChanged;

添加自己的自定义事件

另一个更干净的方法是提出自定义事件， - 例如 MyDataChangedEvent 以下。这将允许您抽出一个事实，即更改来自一个文本框。

  //假设您需要为您的活动定制签名。如果没有，请使用现有的标准事件委托
 public delegate void myDataChangedDelegate（object sender，YourCustomArgsHere args）; 
 
 //暴露您的组件的事件
 public event myDataChangedDelegate MyDataChangedEvent; 
 
 //并提高
 var eventSubscribers = MyDataChangedEvent; 
 if（eventSubscribers！= null）
 {
 eventSubscribers（this，myCustomArgsHere）; 
} 
  

您还可以查看Ent Lib复合应用程序块和智能客户端软件工厂 - 这是一个非常灵活的事件经纪/ pub子机制，用于在SmartParts（控件，表单对话框等）中以松散耦合的方式同步。（CAB现在已经过时了） 。

I have some Events I created on my own and was wondering on how to raise them when I want.

Probably my application design is also messed up, might take a look at that if you like.

This is the Structure

ProgramContext
 - Form MainWindow
  + Control TextBox
  + Control Button
  + ...

In this case, the MainWindow.TextBox holds some information that is updated quite often at runtime. So, I somehow need it to refresh itself when I want to (so it can reload its data from the database, where the it's stored)

I tried hooking an EventHandler to its Validating-Event, but that didn't seem to do the trick.

So, basically I have a method that reloads the data in ProgramContext

DataTable table = _adapter.GetData();
foreach (DataRow row in table.Rows)
{
  MainWindow.TextBox.Text += table.Text.ToString();
}

That needs to be done whenever another method (that writes new data into table) is executed.

Any ideas?

解决方案

Edit : It seems your question is more about hooking into a specific event, but FWIW below is how to fire custom events in general.

Handling the TextBox Changed Event

From what I understand, you want an external party to monitor events raised from a textbox on a Form and then to reload data on another form?

A quick and dirty would be to make the Form TextBox public and then others could subscribe to this event

MainForm.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);

OR, in more recent versions of C#:

MainForm.textBox1.TextChanged += this.textBox1_TextChanged;

Adding Your own Custom Event

Another, cleaner way would be to raise a custom event, - e.g. MyDataChangedEvent below. This will allow you to abstract away the fact that the changes are coming from a textbox at all.

// Assuming you need a custom signature for your event. If not, use an existing standard event delegate
public delegate void myDataChangedDelegate(object sender, YourCustomArgsHere args);

// Expose the event off your component
public event myDataChangedDelegate MyDataChangedEvent;

// And to raise it
var eventSubscribers = MyDataChangedEvent;
if (eventSubscribers != null)
{
   eventSubscribers(this, myCustomArgsHere);
}

You might also look at the Ent Lib Composite Application Block and Smart Client Software Factory - this has a very flexible event broking / pub sub mechanism for synchronising across UI "SmartParts" (controls, forms dialogs etc) in a loose-coupled fashion. (CAB is now very dated).

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