How to expand in Unity and C #

I've seen this before, but I haven't really used it, I hope it will be used

It probably means that in C #, especially when using unity, the existing framework provides us with some fixed methods, but sometimes we want to modify these methods,

At this point we use the expansion method , also known as C # syntax sugar.

However, there are several points to note:

• The class must be static, that is, still class, but cannot inherit the Monobehaviour class.
• Methods in static classes also need to be static.
• The parameters passed in need to be decorated with this modifier, such as public static void Setpositionx (this Transform trans) {}
• If the write extension method is in a namespace, it is necessary to introduce a namespace when other classes are used, such as using Extends;

Below the code directly, relatively simple, understand the meaning can be.

1 usingUnityengine;2 usingSystem.Collections;3 namespaceExtends {//Note namespace4      Public Static classExtendtransform {//Static class5          Public Static voidSetpositionx ( ThisTransform Trans,floatx) {//static method, note the location of this6Trans.position =NewVector3 (x, TRANS.POSITION.Y, trans.position.z);7         }8          Public Static BOOLHavezero ( ThisTransform Trans) {//can have return value9Return (trans.position==new Vector3 (0,0,0));Ten         } One     } A}

The above is the definition code for the extension method, followed by the application.

1 usingUnityengine;2 usingSystem.Collections;3 usingExtends; Introducing an extension method namespace4  Public classTest:monobehaviour {5      PublicGameobject obj;6     voidStart () {7 Debug.Log (obj.transform.position);8Obj.transform.SetPositionX (Ten); Calling methods directly9     }Ten}

Then paste some examples from the Internet to help you understand. The specific author is unknown.

1 usingUnityengine; 2 usingSystem.Collections; 3    4  Public Static classExtensions5 {  6      Public Static voidSetpositionx ( ThisTransform T,floatnewx)7     {  8T.position =NewVector3 (newx, T.POSITION.Y, t.position.z); 9     }  Ten      One      Public Static voidSetpositiony ( ThisTransform T,floatnewy) A     {   -T.position =NewVector3 (t.position.x, Newy, t.position.z);  -     }   the      -      Public Static voidSetpositionz ( ThisTransform T,floatNewz) -     {   -T.position =NewVector3 (t.position.x, T.POSITION.Y, Newz);  +     }   -      +      Public Static floatGetpositionx ( ThisTransform t) A     {   at         returnt.position.x;  -     }   -      -      Public Static floatGetpositiony ( ThisTransform t) -     {   -         returnT.POSITION.Y;  in     }   -      to      Public Static floatGetpositionz ( ThisTransform t) +     {   -         returnt.position.z;  the     }   *      $      Public Static BOOLHasrigidbody ( Thisgameobject gobj)Panax Notoginseng     {   -         return(Gobj.rigidbody! =NULL);  the     }   +      A      Public Static BOOLHasanimation ( Thisgameobject gobj) the     {   +         return(Gobj.animation! =NULL);  -     }   $      $      Public Static voidSetspeed ( ThisAnimation Anim,floatnewspeed) -     {   -Anim[anim.clip.name].speed =Newspeed;  the     }   -}

Use:

1 usingUnityengine; 2 usingSystem.Collections; 3     4  Public classPlayer:monobehaviour5 {  6     voidUpdate ()7     {  8         floatCurrentX =transform.  Getpositionx (); 9Transform. Setpositionx (CurrentX +5f); Ten         if(Gameobject.hasrigidbody ()) One         {   A         }   -         if(Gameobject.hasanimation ()) -         {   the gameObject.animation.SetSpeed (2f);  -         }   -     }   -}

In the future, we will update some small knowledge points, hoping to improve together with you.

How to expand in Unity and C #