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POConstructor error by Abstract class
 

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    <p>Iam working on a application with a abstract class.</p> <p>My abstract class = Werknemer The subclasses = Ober and Kok </p> <p>Now i got a error when i add this line in my form</p> <p><code>Kok a = new Kok();</code></p> <p>"does not contain a constructor that takes 0"</p> <p>Do i something wrong?</p> <p>My abstract class: </p> <pre><code>abstract class Werknemer { public string Naam { get; private set; } public double FTE { get; private set; } public int WerknemersCode { get; private set; } public DateTime DatumIndienst { get; private set; } public string WerktBijRestaurant { get; private set; } public decimal FooiUitkering { get; private set; } public Werknemer(string Naam, Adres Adres, double FTE, int WerknemersCode, DateTime DatumIndienst, string Res) { this.Naam = Naam; this.FTE = FTE; this.WerknemersCode = WerknemersCode; this.DatumIndienst = DatumIndienst; this.WerktBijRestaurant = Res; } public String AlsString() { return Naam; } public abstract String MaakSchoon(); } </code></pre> <p>MY other subclasses :</p> <pre><code>class Ober : Werknemer { public bool AllRounder { get; private set; } public bool Bediening { get; private set; } public decimal Fooi { get; private set; } public Ober(string Naam, Adres Adres, double FTE, int WerknemersCode, DateTime DatumIndienst, string res): base(Naam, Adres, FTE, WerknemersCode, DatumIndienst, res) { // this.AllRounder = AllRounder; // this.Bediening = Bediening; // this.FooienPot = FooienPot; } public String ToString() { return null; } public override String MaakSchoon() { return "Ober"; } </code></pre> <p>Other subclass</p> <pre><code>class Kok : Werknemer { public bool Leadkok { get; private set; } public string Specialiteit { get; private set; } public Kok(string Naam, Adres Adres, double FTE, int WerknemersCode, DateTime DatumIndienst, string res) : base ( Naam, Adres, FTE, WerknemersCode, DatumIndienst, res) { // this.Leadkok = Leadkok; // this.Specialiteit = Specialiteit; } public String ToString() { return null; } public override String MaakSchoon() { return "kok"; } </code></pre>
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    1. COIn your third code block, you declare the constructor `public Kok(string Naam, Adres Adres, double FTE, int WerknemersCode, DateTime DatumIndienst, string res)` which has 6 parameters. But you invoke it with 0 arguments (`new Kok()`).
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    2. COYou have no default constructor defined. And what's more, you aren't calling the parameters you overloaded 'Kok' with in the first place.
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