你能帮我解决这个跳跃的 animation 代码吗？我遇到了麻烦

Question

I'm trying to make a jump animation and I have one error thats being too well... Broad this is the error code

"Assets\Character2DController.cs(64,9): error CS0201: Only assignment, call, increment, decrement, await, and new object expressions can be used as a statement"

And here is the code I have (it's all on one page):

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Character2DController : MonoBehaviour
{
    public float MovementSpeed = 1;
    
    public float JumpForce = 1;

    private Rigidbody2D _rigidbody;

    private Animator anim;

    private bool Grounded;

    
    // Start is called before the first frame update
    private void Start()
    {
        anim = GetComponent<Animator>();
        _rigidbody = GetComponent<Rigidbody2D>();
    }

    // Update is called once per frame
    private void Update()
    {
        float movement = Input.GetAxis("Horizontal");
        transform.position += new Vector3(movement,0,0) * Time.deltaTime * MovementSpeed;

        if(Input.GetKey(KeyCode.Space) && Grounded)
         Player_jump();

        //this is animation do not grab if reusing this code (whats below this)
        if(movement == 1)
        transform.localScale = Vector3.one;
        else if (movement == -1)
        transform.localScale = new Vector3(-1, 1, 1);

        anim.SetBool ("Grounded", Grounded);

        if (movement == 0) {
            anim.SetBool("IsWalking", false);
        }
        if (movement == 1){
            anim.SetBool("IsWalking", true);
        }
        if (movement == -1){
            anim.SetBool("IsWalking", true);
        }
       


    }

    private void Player_jump() 
    { 
      _rigidbody.velocity = new Vector2(_rigidbody.velocity.x, MovementSpeed);
        Grounded = false;
    }
    private void OnCollisionEnter2D(Collision2D collision)
    {
        if(collision.gameObject.tag == "Ground")
        Grounded == true;
    }

}

Answer 1

Line 64 is here:

    private void OnCollisionEnter2D(Collision2D collision)
    {
        if(collision.gameObject.tag == "Ground")
        Grounded == true; /* <--- line 64 */
    }

The problem is that you're using two = symbols, which makes this an equality check, rather than what you mean to do, which is assigning true to Grounded with one = . Change to Grounded = true; and it should fix the error.