C# 在前一个事件的委托中调用其调用方时未触发事件处理程序

tl；dr

实现类：

public Main()
{
    Foo foo = new Foo();
    foo.OnBarOneResponse += foo_OnBarOneResponse;
    foo.OnBarTwoResponse += foo_OnBarTwoResponse;
    foo.FetchBarOne();
}

void foo_OnBarOneResponse(String response)
{
    // Called successfully.
    this.foo.FetchBarTwo();
}

void foo_OnBarTwoResponse(String response)
{
    // Never called :(
} 

Foo.cs

private MyJavascriptInjector _javascriptInjector = new MyJavascriptInjector();

public delegate void OnBarOneResponseHandler(String response);
public delegate void OnBarTwoResponseHandler(String response);
public event OnBarOneResponseHandler OnBarOneResponse = delegate { };
public event OnBarTwoResponseHandler OnBarTwoResponse = delegate { };

private void _onBarOneResponse(String response)
{
    // Called Successfully
    OnBarOneResponse(response);
}

private void _onBarTwoResponse(String response)
{
    // Never called :(
    OnBarTwoResponse(response);
}

public Foo() 
{
    webBrowser.ObjectForScripting = _javascriptInjector;
    _javascriptInjector.OnBarOneResponse += _onBarOneResponse;
    _javascriptInjector.OnBarTwoResponse += _onBarTwoResponse;
    webBrowser.Navigate("http://myurl", null, new Byte[0], myHeaders");
}

public void FetchBarOne()
{
    webBrowser.InvokeScript("fetchBarOne");
}

public void FetchBarTwo()
{
    webBrowser.InvokeScript("fetchBarTwo");
}

[System.Runtime.InteropServices.ComVisible(true)]
public class MyJavascriptInjector
{
    public delegate void OnBarOneResponseHandler(string response);
    public delegate void OnBarTwoResponseHandler(string response);
    public event OnBarOneResponseHandler OnBarOneResponse;
    public event OnBarTwoResponseHandler OnBarTwoResponse;

    public void OnBarOneResponse(String response)
    {
        // Called successfully!
        OnBarOneResponse(response);
    }

    public void OnBarTwoResponse(String response)
    {
        // ALSO CALLED SUCCESSFULLY BUT WHEN CALLING THIS Foo.cs event NEVER GETS FIRED.  
        // IT GETS LOST SOMEWHERE BETWEEN HERE and Foo.cs!
        OnBarTwoResponse(response);
    }
}

MyJavascriptInjector.cs

private MyJavascriptInjector _javascriptInjector = new MyJavascriptInjector();

public delegate void OnBarOneResponseHandler(String response);
public delegate void OnBarTwoResponseHandler(String response);
public event OnBarOneResponseHandler OnBarOneResponse = delegate { };
public event OnBarTwoResponseHandler OnBarTwoResponse = delegate { };

private void _onBarOneResponse(String response)
{
    // Called Successfully
    OnBarOneResponse(response);
}

private void _onBarTwoResponse(String response)
{
    // Never called :(
    OnBarTwoResponse(response);
}

public Foo() 
{
    webBrowser.ObjectForScripting = _javascriptInjector;
    _javascriptInjector.OnBarOneResponse += _onBarOneResponse;
    _javascriptInjector.OnBarTwoResponse += _onBarTwoResponse;
    webBrowser.Navigate("http://myurl", null, new Byte[0], myHeaders");
}

public void FetchBarOne()
{
    webBrowser.InvokeScript("fetchBarOne");
}

public void FetchBarTwo()
{
    webBrowser.InvokeScript("fetchBarTwo");
}

[System.Runtime.InteropServices.ComVisible(true)]
public class MyJavascriptInjector
{
    public delegate void OnBarOneResponseHandler(string response);
    public delegate void OnBarTwoResponseHandler(string response);
    public event OnBarOneResponseHandler OnBarOneResponse;
    public event OnBarTwoResponseHandler OnBarTwoResponse;

    public void OnBarOneResponse(String response)
    {
        // Called successfully!
        OnBarOneResponse(response);
    }

    public void OnBarTwoResponse(String response)
    {
        // ALSO CALLED SUCCESSFULLY BUT WHEN CALLING THIS Foo.cs event NEVER GETS FIRED.  
        // IT GETS LOST SOMEWHERE BETWEEN HERE and Foo.cs!
        OnBarTwoResponse(response);
    }
}

=================

我有一个对象Foo，上面有两个方法，FetchBarOne和FetchBarTwo

每个方法上都有一个事件，OnBarOneResponse和onbartworresponse

实现类使用符号“+=”在其构造函数中注册Foo的事件，并为每个事件定义回调函数：Foo\u OnBarOneResponse（字符串响应）和Foo\u onbartworresponse（字符串响应）

问题：

public Main()
{
    Foo foo = new Foo();
    foo.OnBarOneResponse += foo_OnBarOneResponse;
    foo.OnBarTwoResponse += foo_OnBarTwoResponse;
    foo.FetchBarOne();
}

void foo_OnBarOneResponse(String response)
{
    // Called successfully.
    this.foo.FetchBarTwo();
}

void foo_OnBarTwoResponse(String response)
{
    // Never called :(
} 

实现类遵循以下内容：

调用

this.foo.FetchBarOne（）

foo\u OnBarOneResponse（字符串响应）

将在稍后启动

在这个回调中，实现类立即调用

this.foo.FetchBarTwo（）

foo_onbartworresponse（字符串响应）

从不触发

更多信息：

public Main()
{
    Foo foo = new Foo();
    foo.OnBarOneResponse += foo_OnBarOneResponse;
    foo.OnBarTwoResponse += foo_OnBarTwoResponse;
    foo.FetchBarOne();
}

void foo_OnBarOneResponse(String response)
{
    // Called successfully.
    this.foo.FetchBarTwo();
}

void foo_OnBarTwoResponse(String response)
{
    // Never called :(
} 

Foo已包装并正在调用以在加载的网页中执行javascript。此网页上有许多javascript函数，包括FetchBarOne和FetchBarTwo。调试时，调用FetchBarTwo，并成功响应数据。但是，在WebBrowser成功返回数据后，当Foo调用其内部OnBartworResponseHandler事件委托（该委托已由实现类注册）时，它会在两者之间的某个位置“丢失”——尽管它不是空的，但它显然有一个对它的引用

修复问题的尝试失败

尝试使用

Dispatcher.Invoke（DispatcherPriority.Normal，newthreadstart（（）=>this.foo.FetchBarTwo（））实现类

尝试从UI线程调用它。没有成功

如果有人对此事有任何想法，我将不胜感激。谢谢

this.foo字段与

foo

变量的实例不同

从你的例子来看：

public Main()
{
    Foo foo = new Foo();
    foo.OnBarOneResponse += foo_OnBarOneResponse;
    foo.OnBarTwoResponse += foo_OnBarTwoResponse;
    foo.FetchBarOne();
}

void foo_OnBarOneResponse(String response)
{
    // Called successfully.
    this.foo.FetchBarTwo();
}

private Foo foo;

public Main()
{
    this.foo = new Foo();
    this.foo.OnBarOneResponse += foo_OnBarOneResponse;
    this.foo.OnBarTwoResponse += foo_OnBarTwoResponse;
    this.foo.FetchBarOne();
}

尝试使用您的字段（示例中未包含该字段）：

---

10行代码比文字墙更能说明问题。我个人能比文本更容易地阅读代码。我相信这里的人也同意我的观点。谢谢。请看我的tl；博士在顶部编辑。我的眼睛，护目镜什么都不做。你只调用foo.FetchBarOne（）；你实际上在哪里提出第二个问题？@Chris它在问题的

foo_OnBarOneResponse

内。