activity.cs

private AppLinking.Builder builder;
public static string longLink = null;
public static string shortLink = null;
public static string UriPrefix = "https://applinkingtest.drcn.agconnect.link";
public static string OpenApp_Link = "https://open.androiddemoapp.com";
public static string OpenDetail_Link = "https://open.androiddemoapp.com/detail?id=358";

private async void CreateAppLink(object sender, EventArgs e)
{
 builder = new AppLinking.Builder();
 // Set a URL prefix.
 builder.SetUriPrefix(UriPrefix);
 // Set a deep link.
 builder.SetDeepLink(Uri.Parse(OpenApp_Link));

 //Set the link preview type. If this method is not called, the preview page with app information is displayed by default.
 builder.SetPreviewType(AppLinking.LinkingPreviewType.AppInfo);

 // (Optional) Set Android link behavior.
 var behaviorBuilder = new AppLinking.AndroidLinkInfo.Builder();
 // Set an earliest version. If a user's app version is earlier than the earliest version, your app will redirect the user to update the app on AppGallery.
 behaviorBuilder.SetMinimumVersion(1);

 builder.SetAndroidLinkInfo(behaviorBuilder.Build());
 longLink = builder.BuildAppLinking().Uri.ToString();
 FindViewById<TextView>(Resource.Id.textLongLink).Text = longLink;

}

private void ShareShortAppLink(object sender, EventArgs e)
{
 string agcLink = FindViewById<TextView>(Resource.Id.textShortLink).Text;
 Intent intent = new Intent(Intent.ActionSend);
 intent.SetType("text/plain");
 intent.PutExtra(Intent.ExtraText, agcLink);
 intent.AddFlags(ActivityFlags.NewTask);
 StartActivity(intent);
}