C No suitable method found to override -- but there is one

Question

I m having trouble overriding the method of a parent class in C   The parent class is setup like so   public class Base       public Base Game1 game                this game   game             public virtual void Draw                      And the child class   public class Ext   Base       public Ext Game1 game    base game                   public override void Draw SpriteBatch batch                  I know I ve successfully overridden a parent method in the past  and right now I m probably overlooking something incredibly simple    what is it   EDIT  That was actually a typo  in the actual script  Ext does derive from Base  The problem still persists  Thanks for the quick answers  though

User · Answer

You have forgotten to derive from Base  public class Ext   Base

User · Answer

You need to inherit from the base class

User · Answer

Probably your base class is a different one with the same name  Check by right click on the extended class and go to the definition  Check if the class is correct one

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You cannot override a function with different parameters  only you are allowed to change the functionality of the overridden method     Compiler Microsoft  R   NET Framework 4 5  using System  using System Collections Generic  using System Linq  using System Text RegularExpressions     Overriding  amp  overloading  namespace polymorpism       public class Program               public static void Main string   args                         drowButn calobj   new drowButn                 BtnOverride calobjOvrid   new BtnOverride                 Console WriteLine calobj btn 5 2  6 6  ToString                    btn has compleately overrided inside this calobjOvrid object             Console WriteLine calobjOvrid btn 5 2  6 6  ToString                   the overloaded function             Console WriteLine calobjOvrid btn new double     5 2  6 6    ToString                  Console ReadKey                         public class drowButn                  same add function overloading to add double type field inputs         public virtual double btn double num1  double num2                         return  num1   num2                           public class BtnOverride   drowButn                  same add function overrided and change its functionality             this will compleately replace the base class function         public override double btn double num1  double num2                          do compleatly diffarant function then the base class             return  num1   num2                         same function overloaded  no override keyword used              this will not effect the base class function          public double btn double   num                        double cal   0               foreach  double elmnt in num                                 cal    elmnt                            return cal

User · Answer

You re not inheriting from your base class   public class Ext   Base          constructor      public override void Draw

User · Answer

Your code as given  after the edit  compiles fine  so something else is wrong that isn t in what you posted     Some things to check  is everything public   That includes both the class and the method     Overload with different parameters   Are you sure that Base is the class you think it is  I e  is there another class by the same name that it s actually referencing   Edit   To answer the question in your comment  you can t override a method with different parameters  nor is there a need to   You can create a new method  with the new parameter  without the override keyword and it will work just fine     If your intention is to prohibit calling of the base method without the parameter you can mark the method as protected instead of public   That way it can only be called from classes that inherit from Base

User · Answer

I do not see the class Ext being derived from Base

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I ran into a similar situation with code that WAS working   then was not   Turned while dragging   dropping code within a file  I moved an object into another set of braces   Took longer to figure out than I care to admit   Bit once I move the code back into its proper place  the error resolved

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The signature of your methods is different  But to override a method the signature must be identical   In your case the base class version has no parameters  the derived version has one parameter   So what you re trying to do doesn t make much sense  The purpose is that if somebody calls the base function on a variable that has the static type Base but the type Ext at runtime the call will run the Ext version  That s obviously not possible with different parameter counts   Perhaps you don t want to override at all

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Make sure that you have the child class explicitly inherit the parent class   public class Ext   Base      stuff

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I ran into this issue only to discover a disconnect in one of my library objects  For some reason the project was copying the dll from the old path and not from my development path with the changes  Keep an eye on what dll s are being copied when you compile

User · Answer

Ext needs to inherit the base  so in your definition it should say   public class Ext   Base

[c#] C# "No suitable method found to override." -- but there is one

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