unity3d - Error on converting UnityScript to C# -

i trying convert unityscript code d# , getting following error:

expression denotes method group, variable, value or type expected on getcomponent

void  update () {     float xvel = getcomponent().rigidbody2d().velocity.x;     if( xvel < 18 && xvel > -18 && xvel !=0){         if(xvel > 0){             getcomponent.rigidbody2d().velocity.x=20;             }else{             getcomponent.rigidbody2d().velocity.x = -20;          }     } } 

your issue with: getcomponent().rigidbody2d() not how use getcomponent, error seeing because getcomponent requires parameter or specified type. js , c# getcomponent work little different. mean do:

void  update () {     float xvel = getcomponent<rigidbody2d>().velocity.x;     if( xvel < 18 && xvel > -18 && xvel !=0){         if(xvel > 0){             getcomponent<rigidbody2d>().velocity.x = 20;             }else{             getcomponent<rigidbody2d>().velocity.x = -20;          }     } } 

also in c#, don't think can modify velocity directly, due property wrappers around it. instead have manually update velocity new vector2. if want set x value, pass in existing y value.

i write this:

private rigidbody2d _rigidbody;  void start() {     _rigidbody = getcomponent<rigidbody2d>(); }  void  update () {     float xvel = _rigidbody.velocity.x;     if( xvel < 18 && xvel > -18 && xvel !=0){         if(xvel > 0){             _rigidbody.velocity = new vector2(20, _rigidbody.velocity.y);             }else{             _rigidbody.velocity = new vector2(-20, _rigidbody.velocity.y);            }     } } 

though i'd change magic 18 in variable can't make guess here represents!