有时候，我看到人们出于一般目的使用独立的案例类，而不是例如模式匹配，
case class Employee(id: Int, name: String, age: Int, city: String)
使用这样的案例类比普通的类有什么优势？
class Employee(id: Int, name: String, age: Int, city: String)
答案 0 :(得分：1)
public class ExtendedWebViewRenderer : WebViewRenderer
{
private WebViewClient webViewClient = new MyWebViewClient();
private static Context context;
private static string SUCCESS_URL = "http://www.rcbazaar.com/PayuReturn.aspx#";
private static string FAILED_URL = "https://www.payumoney.com/mobileapp/payumoney/failure.php";
private static string firstname = "Anbu";
private static string lastname = "AV";
public string url_s;
private static string email = "anbukm91@gmail.com";
private static string productInfo = "93314";
private static string mobile = "8220155182";
public static string totalAmount = "10.00";
public ExtendedWebViewRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.WebView> e)
{
try
{
base.OnElementChanged(e);
if (this.Control != null)
{
var webView = new global::Android.Webkit.WebView(this.Context);
var view = (ExtendedWebView)Element;
Control.Settings.JavaScriptEnabled = true;
Control.Settings.SetSupportZoom(false);
Control.Settings.DomStorageEnabled = true;
Control.Settings.LoadWithOverviewMode = true;
Control.Settings.UseWideViewPort = true;
Control.Settings.CacheMode = CacheModes.NoCache;
Control.Settings.SetSupportMultipleWindows(true);
Control.Settings.JavaScriptCanOpenWindowsAutomatically = true;
Control.AddJavascriptInterface(new PayUJavaScriptInterface(this.Context), "PayUMoney"); //JavaInterface
url_s = "https://test.payu.in/_payment";
Control.PostUrl(url_s, Encoding.UTF8.GetBytes(getPostString()));
Control.SetWebViewClient(webViewClient);
}
}
catch (System.Exception ex)
{
}
}
//PostString is Append All parameters
public string getPostString()
{
string TxtStr = Generate();
string strHash = Generatehash512(TxtStr + DateTime.Now);
string txnid = strHash.ToString().Substring(0, 20);
string key = "W5bPaX"; //Key gtKFFx
string salt = "H7b5NDWN"; //salt eCwWELxi
Java.Lang.StringBuilder post = new Java.Lang.StringBuilder();
Java.Lang.StringBuilder checkSumStr = new Java.Lang.StringBuilder();
try
{
checkSumStr.Append(key);
checkSumStr.Append("|");
checkSumStr.Append(txnid);
checkSumStr.Append("|");
checkSumStr.Append(1);
checkSumStr.Append("|");
checkSumStr.Append(productInfo);
checkSumStr.Append("|");
checkSumStr.Append(firstname);
checkSumStr.Append("|");
checkSumStr.Append(email);
checkSumStr.Append("|||||||||||");
checkSumStr.Append(salt);
var ss = Generatehash512(checkSumStr.ToString());
post.Append("key=");
post.Append(key);
post.Append("&");
post.Append("txnid=");
post.Append(txnid);
post.Append("&");
post.Append("amount=");
post.Append(1);
post.Append("&");
post.Append("productinfo=");
post.Append(productInfo);
post.Append("&");
post.Append("firstname=");
post.Append(firstname);
post.Append("&");
post.Append("email=");
post.Append(email);
post.Append("&");
post.Append("phone=");
post.Append(mobile);
post.Append("&");
post.Append("surl=");
post.Append(SUCCESS_URL);
post.Append("&");
post.Append("furl=");
post.Append(FAILED_URL);
post.Append("&");
post.Append("hash=");
post.Append(ss);
}
catch (NoSuchAlgorithmException e1)
{
// TODO Auto-generated catch block
e1.PrintStackTrace();
}
return post.ToString();
}
//Generate random transaction id
public string Generate()
{
long ticks = System.DateTime.Now.Ticks;
System.Threading.Thread.Sleep(200);
Java.Util.Random rnd = new Java.Util.Random();
string rndm = Integer.ToString(rnd.NextInt()) + (System.DateTime.Now.Ticks - ticks / 1000);
return rndm;
}
//Generating Hash(Checksum) string
public string Generatehash512(string text)
{
byte[] message = Encoding.UTF8.GetBytes(text);
UnicodeEncoding UE = new UnicodeEncoding();
byte[] hashValue;
SHA512Managed hashString = new SHA512Managed();
string hex = "";
hashValue = hashString.ComputeHash(message);
foreach (byte x in hashValue)
{
hex += System.String.Format("{0:x2}", x);
}
return hex;
}
//Java Interface After Payment its Return Success/failure
private class PayUJavaScriptInterface : Java.Lang.Object
{
Context mContext;
public PayUJavaScriptInterface(Context c)
{
mContext = c;
}
//public void Success
[Export]
[JavascriptInterface]
public void success(long id, string paymentId)
{
Intent intent = new Intent(mContext, typeof(success));
mContext.StartActivity(intent);
}
[Export]
[JavascriptInterface]
public void failure(long id, string paymentId)
{
Intent intent = new Intent(mContext, typeof(failure));
mContext.StartActivity(intent);
}
}
//WebView Client Run Time
private class MyWebViewClient : WebViewClient
{
public override void OnPageStarted(Android.Webkit.WebView view, string url, Android.Graphics.Bitmap favicon)
{
base.OnPageStarted(view, url, favicon);
}
public override void OnPageFinished(Android.Webkit.WebView view, string url)
{
base.OnPageFinished(view, url);
}
public override void OnReceivedSslError(Android.Webkit.WebView view, SslErrorHandler handler, SslError error)
{
Log.Info("Error", "Exception caught!");
handler.Proceed();
}
}
}
）
当您声明上述类时，每个字段都是构造函数的一部分，而不是类成员。要使它们成为类字段，您需要在每个字段之前添加val。但是对于默认情况下的case类，它们是该类的成员。
此外，默认情况下，案例类具有class Employee(id: Int, name: String, age: Int, city: String，toString和hashcode方法。
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