C# Call a Function by a String with Parameters / Invoke a Function with parameters?

Question

Hi,

I try to create a Button in WorldSpace. The Button is triggered by a Raycast when the Player press the LMB. Then a function is called, that call the Action Function, which I have defined in public variables.

The Variables :

     public MonoBehaviour ButtonActionClass; 
 
     public string FunctionName;
 
     public float FunctionDelayTime = 0.0f;

The Function:

 public void TriggerButton ()
 {
     if(!hasCondition)
     {
         ButtonActionClass.Invoke(FunctionName,FunctionDelayTime);
     }
 }

This code works pretty well, but the problem is that I can't add parameters with this Invoke function.

So I tried something different :

 public void TriggerButton ()
 {
     if(!hasCondition)
     {
         // ObjArray is a private Object[] ObjArray; in which I've added a few Variables
 
         ButtonActionClass.GetType().GetMethod(FunctionName).Invoke(FunctionName,ObjArray);
     }
 }

But the Problem is that I have to replace every Target Function parameters to an Object[] and convert them, if this is possible at all.

So I hope that a solution can be found.

PS : Sorry for my English

Answer 1

Answer by ShadyProductions · Aug 08, 2017 at 04:56 PM

Since you can not call Invoke with parameters you can use StartCoroutine for this.

Say your code is:

  void Start()
  {
      Invoke("MyFunction", 1f);
  }
  
  void MyFunction()
  {
      // Do your thing.
  }

Instead you can use Coroutine by passing argument like:

  void Start()
  {
      StartCoroutine(MyFunction(false, 1f));
  }
  
  IEnumerator MyFunction(bool status, float delayTime)
  {
      yield return new WaitForSeconds(delayTime);
      // Now do your thing here
  }

Add comment · Show 2 · Share

Arterion · Aug 08, 2017 at 05:11 PM 0

Share

But this code only work if the Function is a Coroutine ,or am I wrong ?

But it is already a good approach, which helps me a lot .

ShadyProductions Arterion · Aug 09, 2017 at 06:54 AM 0

Share

The function simply needs to return an IEnumerator.

Answer 2

Answer by Arterion · Aug 13, 2017 at 09:02 AM

Today I finally could test the code, but I realised that I can't use a variable with StartCouroutine() and I get the following error : .. is a field but a `method group' was expected

 ButtonActionClass.StartCoroutine(FunctionName( TransformInput, GameobjectInput...));

Add comment · Show 5 · Share

ShadyProductions · Aug 13, 2017 at 08:43 PM 0

Share

Need more information about your code..

Arterion · Aug 14, 2017 at 11:53 AM 0

Share

I simply used the same variables as before :

 public MonoBehaviour ButtonActionClass; 
 
 public string FunctionName;
 
 // Method Parameters
 
 public Transform TransformInput;
 
 public Gameobject GameobjectInput;

the trigger Function:

  public void TriggerButton ()
  {
         ButtonActionClass.StartCoroutine(FunctionName( TransformInput, GameobjectInput...));
  }

Arterion · Aug 16, 2017 at 01:58 PM 0

Share

Do you need more information?

ShadyProductions Arterion · Aug 18, 2017 at 08:06 PM 0

Share

You cannot pass it like a string

public string FunctionName; // not possible to pass it to startcoroutine with parameters like that.

Pass the actual method.

Arterion ShadyProductions · Aug 19, 2017 at 08:26 AM 0

Share

If so, StartCoroutine is not a solution for me, because I wan't to use the Button Script much more than 10 times and call always different functions.

That is why I use those public variables, so that I don't have to write every function name and there specific parameters in the Code.

Would Sendmessage be an alternative? Or is there no other option?

C# Call a Function by a String with Parameters / Invoke a Function with parameters?

2 Replies

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions