How do I use Yield in C#?

Question

How does one use yield in C#. It behaves differently then the Javascript version of yield.

I was trying to convert t$$anonymous$$s Javascript example to C#. It doesn't seem to call the corfunAlp routine. Help!

using UnityEngine; using System.Collections;

public class fader : MonoBehaviour {

 public GameObject gamobjBac;
 Color thecolor;

 // Use t$$anonymous$$s for initialization
 void Start ()
 {
     corfunAlp (gamobjBac, 0, 1, 1);
     // Turn opaque 
     corfunAlp (gamobjBac, 4, 1, 0);
     // Turn transparent     
 }

 // Update is called once per frame
 void Update ()
 {
 }

 //function that fades alpha for a game object up or down with a start delay and duration of fade
 public IEnumerator corfunAlp (GameObject gamobjGamObj, float floWai, float floDur, int intAlpGoa)
 {

     float floAlp = (1 - intAlpGoa);
     intAlpGoa = ((2 * intAlpGoa) - 1);

     yield return new WaitForSeconds (floWai);

     w$$anonymous$$le (floAlp &gt;= 0 &amp;&amp; floAlp &lt;= 1) 
     {
         thecolor = gamobjGamObj.renderer.material.GetColor ("_Color");
         thecolor.a = floAlp; 
         gamobjGamObj.renderer.material.SetColor ("_Color", thecolor);

         floAlp = floAlp + ((Time.deltaTime/floDur)*intAlpGoa);    
         yield return true; 
     }
 }

Answer 1

Best Answer

Answer by Murcho · Nov 22, 2009 at 04:44 PM

You need to manually call StartCoroutine() for C# coroutines. That information is provided in the documentation here.

To use it in you example, simply change your Start function as follows.

// Use t$$anonymous$$s for initialization
void Start ()
{
        StartCoroutine(corfunAlp (gamobjBac, 0, 1, 1));
        // Turn opaque 
        StartCoroutine(corfunAlp (gamobjBac, 4, 1, 0));
        // Turn transparent     
}

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Answer 2

Answer by equalsequals · Nov 22, 2009 at 07:53 PM

Murcho is correct. But for additional help I wrote t$$anonymous$$s tutorial aw$$anonymous$$le back on Coroutines for both JS and C#:

http://infiniteunity3d.com/2009/09/27/tutorial-coroutines-pt-1-waiting-for-input/

Hope that helps!

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Michael La Voie · Nov 22, 2009 at 08:55 PM 0

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Thank you, that was very helpful! I'm sure you're busy, please add the screen shots back in if you ever have the time.

equalsequals · Nov 22, 2009 at 09:29 PM 0

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Haha - you have no idea. I was hoping to get to that some time this evening if I can!

equalsequals · Nov 23, 2009 at 03:13 PM 0

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Just an FYI I was able to get those images back into the blog post last night. Cheers!

Michael La Voie · Nov 26, 2009 at 08:46 AM 0

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I really appreciate it. This was just a case of perfect timing as I was just starting to puzzle over coroutines. Thanks again!

Michael La Voie · Nov 26, 2009 at 08:53 AM 1

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FYI, @equalsequals, not that you haven't done plenty already, but you may be interested in this tool by google called Google code Prettify. I've used it before and its quite easy, just add the JS and it will do code coloring for your example code: http://code.google.com/p/google-code-prettify/

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Answer 3

Answer by synapsemassage · Jul 16, 2011 at 11:11 AM

And there is even some more info in the docs. Here.

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How do I use Yield in C#?

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