如何在Xamarin IOS中传递参数到事件处理程序

如何将字符串参数传递给EventHandler?

ViewController (A)写事件处理程序

    public event EventHandler ValueChanged; 
    void ResponseCompleted(object sender, CommonCode.ResponseEventArgs e){
        this.InvokeOnMainThread (delegate { 
        if (ValueChanged != null) {
        ValueChanged (this, new EventArgs (e.ResponseData));
// e.ResponseData is an String datatype.
         }
     });
    }

ViewController (B)

relatedDataSource.ValueChanged += delegate {
 Get Response Data from ViewControllerA
}

public event EventHandler<string> ValueChanged;
void ResponseCompleted(object sender, CommonCode.ResponseEventArgs e){
    this.InvokeOnMainThread (delegate { 
    var handler = ValueChanged;
    if (handler != null)
        handler(this, e.ResponseData);
    });
}
relatedDataSource.ValueChanged += (s, responseData) => {
    //Your data is in responseData variable
}