C＃：String作为事件的参数？ [英] C#: String as parameter to event?

问题描述

表单中有一个richtTextBox。我希望工作线程将字符串传递给表单，以便每个字符串都显示在文本框中。

每次在工作线程中生成一个新的字符串，我调用一个事件，现在应该显示字符串。
但我不知道如何传递字符串！这是我迄今为止所尝试的：

  ///// Form1 
 private void btn_myClass_Click（object sender，EventArgs e）
 {
 myClass myObj = new myClass（）; 
 myObj.NewListEntry + = myObj_NewListEntry; 
 Thread thrmyClass = new Thread（new ThreadStart（myObj.ThreadMethod））; 
 thrmyClass.Start（）; 
} 
 
 private void myObj_NewListEntry（Object objSender，EventArgs e）
 {
 this.BeginInvoke（（MethodInvoker）delegate 
 {
 / /这里我想把我的字符串从工作线程添加到文本框！
 richTextBox1.Text + =TEXT; //我想要：richTextBox1.Text + = myStringFromWorkerThread; 
}）; 
} 
  

---

  ///// myClass（working thread ...）
 class myClass 
 {
 public event EventHandler NewListEntry; 
 
 public void ThreadMethod（）
 {
 DoSomething（）; 
} 
 
 protected virtual void OnNewListEntry（EventArgs e）
 {
 EventHandler newListEntry = NewListEntry; 
 if（newListEntry！= null）
 {
 newListEntry（this，e）; 
} 
} 
 
 private void DoSomething（）
 {
 /////做一些事情并生成字符串，如测试。 .. 
 string test =test; 
 
 
 //这里我想通过test-string！但是怎么办呢？ 
 OnNewListEntry（EventArgs.Empty）; //我想要：OnNewListEntry（test）; 
} 
} 
  

解决方案

这个

  public class NewListEntryEventArgs：EventArgs 
 {
 private readonly string test; 
 
 public NewListEntryEventArgs（string test）
 {
 this.test = test; 
} 
 
 public string Test 
 {
 get {return this.test; } 
} 
} 
  

然后你就这样声明你的类>

  class MyClass 
 {
 public delegate void NewListEntryEventHandler（
 object sender，
 NewListEntryEventArgs args ）; 
 
 public event NewListEntryEventHandler NewListEntry; 
 
 protected virtual void OnNewListEntry（string test）
 {
 if（NewListEntry！= null）
 {
 NewListEntry（this，new NewListEntryEventArgs（test） ）; 
} 
} 
} 
  

在订阅 form

  private void btn_myClass_Click（object sender，EventArgs e）
 {
 MyClass myClass = new MyClass（）; 
 myClass.NewListEntry + = NewListEntryEventHandler; 
 ... 
} 
 
 private void NewListEntryEventHandler（
 object sender，
 NewListEntryEventArgs e）
 {
 if（richTextBox1 .invokeRequired）
 {
 this.Invoke（（MethodInvoker）delegate 
 {
 this.NewListEntryEventHandler（sender，e）; 
}）; 
 return; 
} 
 
 richTextBox1.Text + = e.Test; 
} 
  

---

自由使 NewListEntryEventArgs 类不可变，因为这是有道理的。我也部分地纠正了您的命名约定，简化并在哪些方面进行了更正。

I have a GUI-thread for my form and another thread that computes things.

The form has a richtTextBox. I want the worker-thread to pass strings to the form, so that every string is displayed in the textbox.

Everytime a new string is generated in the worker thread I call an event, and this should now display the string. But I don't know how to pass the string! This is what I tried so far:

///// Form1
private void btn_myClass_Click(object sender, EventArgs e)
{
    myClass myObj = new myClass();
    myObj.NewListEntry += myObj_NewListEntry;
    Thread thrmyClass = new Thread(new ThreadStart(myObj.ThreadMethod));
    thrmyClass.Start();
}

private void myObj_NewListEntry(Object objSender, EventArgs e)
{
    this.BeginInvoke((MethodInvoker)delegate
    {
        // Here I want to add my string from the worker-thread to the textbox!
        richTextBox1.Text += "TEXT"; // I want: richTextBox1.Text += myStringFromWorkerThread;
    });
}

---

///// myClass (working thread...)
class myClass
{
    public event EventHandler NewListEntry;

    public void ThreadMethod()
    {
        DoSomething();
    }

    protected virtual void OnNewListEntry(EventArgs e)
    {
        EventHandler newListEntry = NewListEntry;
        if (newListEntry != null)
        {
            newListEntry(this, e);
        }
    }

    private void DoSomething()
    {
        ///// Do some things and generate strings, such as "test"...
        string test = "test";


        // Here I want to pass the "test"-string! But how to do that??
        OnNewListEntry(EventArgs.Empty); // I want: OnNewListEntry(test);
    }
}

解决方案

Like this

public class NewListEntryEventArgs : EventArgs
{
    private readonly string test;

    public NewListEntryEventArgs(string test)
    {
        this.test = test;
    }

    public string Test
    {
        get { return this.test; }
    }
}

then you declare your class like this

class MyClass
{
    public delegate void NewListEntryEventHandler(
        object sender,
        NewListEntryEventArgs args);

    public event NewListEntryEventHandler NewListEntry;

    protected virtual void OnNewListEntry(string test)
    {
        if (NewListEntry != null)
        {
            NewListEntry(this, new NewListEntryEventArgs(test));
        }
    }
}

and in the subscribing Form

private void btn_myClass_Click(object sender, EventArgs e)
{
    MyClass myClass = new MyClass();
    myClass.NewListEntry += NewListEntryEventHandler;
    ...
}

private void NewListEntryEventHandler(
    object sender,
    NewListEntryEventArgs e)
{
    if (richTextBox1.InvokeRequired)
    {
        this.Invoke((MethodInvoker)delegate
            {             
                this.NewListEntryEventHandler(sender, e);
            });
        return;
    }

    richTextBox1.Text += e.Test;
}

---

I've taken the liberty of making the NewListEntryEventArgs class immutable, since that makes sense. I've also partially corrected your naming conventions, simplified and corrected where expedient.

这篇关于C＃：String作为事件的参数？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！