将js转换为C＃

Question

Need assistance with translating JS to C#.

Original script:

var target : GameObject;
var fadeDuration : float = 3.0;


function Update(){

    if (target.GetComponent.<Renderer>().material.color.a > 0)
    target.GetComponent.<Renderer>().material.color.a -= Time.deltaTime/fadeDuration;
}

Translated C# script:

using UnityEngine;
using System.Collections;

public class FadeOutDeadBody : MonoBehaviour {
GameObject target;
float fadeDuration = 3.0f;
void Update (){

    if (target.GetComponent.<Renderer>().material.color.a > 0)
    target.GetComponent.<Renderer>().material.color.a -= Time.deltaTime/fadeDuration;
}

}

I receive errors from Unity3d that say:

folder/FadeOutDeadBody.cs(9,29): error CS1525: Unexpected symbol <', expecting identifier'

Any ideas how to fix this problem?

Answer 1

只需删除GetComponent.<Renderer>的点GetComponent.<Renderer> => GetComponent<Renderer>

Answer 2

Everyone left this out so I decided to post.

You cannot modify the alpha of a color directly. You have to create a new color , modify the alpha, then assign it back to your Material color. Also remove the dot too. This is what it should look like:

public class FadeOutDeadBody : MonoBehaviour
{
    public GameObject target;
    float fadeDuration = 3.0f;

    Renderer renderer;

    void Start()
    {
        renderer = target.GetComponent<Renderer>();
    }

    void Update()
    {

        if (renderer.material.color.a > 0)
        {
            Color color = renderer.material.color;
            color.a -= Time.deltaTime / fadeDuration;
            renderer.material.color = color;
        }
    }
}

Answer 3

GetComponent.<Renderer>() -> GetComponent<Renderer>() You have extra '.' in there that is throwing the compiler off.

Edit to respond to your comment on romain-aga's answer

You need to expand it to look something like this (C# works a bit differently than JS so you can't be as flexible)

Renderer r = target.GetComponent<Renderer>();
Color c = r.material.color;
c.a -= Time.deltaTime/fadeDuration;
r.material.color = c;

The r, g, b, and a properties of a color in C# are read-only, so you have to modify the entire color value.

Note: I don't have Unity on the computer I'm at right now, so this is untested. We'll see how well my memory is working today.

Answer 4

Instead of this

target.GetComponent.<Renderer>()

you probably need this

target.GetComponentInParent<Renderer>()

or this

target.GetComponent(typeof(Renderer))

Answer 5

Just be careful when "translating" code from one language to another, as conventions are language specific. Looking at the unity docs, the proper way to call GetComponent is as a generic, so you can fix this particular issue by simply removing the period in your code calling GetComponent.

In general, you will probably have more problems like this due to C# being very different from JavaScript, so just be aware of this.

Reference: GetComponent documentation