c# - 如何在 Xamarin IOS 中将参数传递给事件处理程序

Question

如何将字符串参数传递给 EventHandler？

View Controller (A) 编写事件处理程序

    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.
         }
     });
    }

View Controller (B)

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

Answer 1

您可以使用通用事件处理程序。例如:

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
}