C＃CS0123：匹配委托Eventhandler没有重载

Question

我在C＃中有以下Android应用程序代码

using Android.App;
using Android.Widget;
using Android.OS;

namespace Practicum1
{
    [Activity(Label = "Practicum 1.2.1", MainLauncher = true)]
    public class MainActivity : Activity
    {
        EditText invullen;
        TextView displaynaam;


        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            TextView begintekst;
            begintekst = new TextView(this);
            begintekst.Text = "Vul je naam in!";

            invullen = new EditText(this);
            invullen.TextChanged += naam_textChanged;

            displaynaam = new TextView(this);
            displaynaam.Text = "Hier kom je naam te staan";


            LinearLayout stapel;
            stapel = new LinearLayout(this);
            stapel.Orientation = Orientation.Vertical;

            stapel.AddView(begintekst);
            stapel.AddView(invullen);
            stapel.AddView(displaynaam);



            // Set our view from the "main" layout resource
            this.SetContentView(stapel);
        }
        private void naam_textChanged(object sender, ItemEventArgs ea)
        {
            displaynaam.Text = "Welkom " + invullen.Text;
        }
    }
}

但后来我收到以下错误消息： ＆＃39; naam_textChanged没有重载匹配委托EventHandler

有谁知道如何解决这个问题？

此致 净莲

Answer 1

您的事件参数不正确。它看起来应该是这样的。

private void naam_TextChanged (object sender, TextChangedEventArgs e)
{

}

检查EditText

的文档

第4点）实施TextChanged事件以捕获EditText中的文字并将其写入TextView。

editText.TextChanged += (object sender, Android.Text.TextChangedEventArgs e) => {

       textView.Text = e.Text.ToString ();

};