Unity C# 进阶语法 ​

public delegate void MyDelegate(string message);

void Start() {
    MyDelegate del = PrintMessage;
    del("Hello, Delegate!");
}

void PrintMessage(string msg) {
    Debug.Log(msg);
}

public class EventPublisher : MonoBehaviour {
    public delegate void MyEventHandler(string message);
    public event MyEventHandler OnEvent;

    void Update() {
        if (Input.GetKeyDown(KeyCode.Space)) {
            OnEvent?.Invoke("Space pressed!");
        }
    }
}

using System.Linq;

void Start() {
    int[] numbers = { 5, 4, 1, 3, 9, 8, 6, 7, 2, 0 };
    
    var query = from num in numbers
                where num % 2 == 0
                select num;
                
    foreach (var num in query) {
        Debug.Log(num);
    }
}

IEnumerator Countdown(int seconds) {
    while (seconds > 0) {
        Debug.Log(seconds);
        yield return new WaitForSeconds(1);
        seconds--;
    }
    Debug.Log("Countdown finished!");
}

void Start() {
    StartCoroutine(Countdown(5));
}

private float speed;

public float Speed {
    get { return speed; }
    set { speed = Mathf.Clamp(value, 0, 100); }
}

private string[] names = new string[10];

public string this[int index] {
    get { return names[index]; }
    set { names[index] = value; }
}

[CreateAssetMenu(fileName = "New Item", menuName = "Inventory/Item")]
public class Item : ScriptableObject {
    public string itemName;
    public Sprite icon;
    public int value;
}

#if UNITY_EDITOR
using UnityEditor;

[CustomEditor(typeof(MyComponent))]
public class MyComponentEditor : Editor {
    public override void OnInspectorGUI() {
        base.OnInspectorGUI();
        
        if (GUILayout.Button("Custom Button")) {
            Debug.Log("Button clicked!");
        }
    }
}
#endif

public static class ExtensionMethods {
    public static void ResetTransform(this Transform t) {
        t.position = Vector3.zero;
        t.rotation = Quaternion.identity;
        t.localScale = Vector3.one;
    }
}

// 使用
void Start() {
    transform.ResetTransform();
}

using System.Threading.Tasks;

async void Start() {
    Debug.Log("Start loading...");
    await LoadDataAsync();
    Debug.Log("Data loaded!");
}

async Task LoadDataAsync() {
    await Task.Delay(2000); // 模拟耗时操作
}