Unity:协作程序中的无限While循环

好的，所以我试图为我的2d字符创建一个小的破折号协程。当协同程序调用时，重力关闭，它在一段时间内在两种速度之间跳跃。问题是在我的Dash协程中，while循环检查时间。时间(当前时间)>开始时间+冲刺时间

在与Mono调试时，我发现我的变量currentTime在设置后没有改变，即使我可以清楚地看到While循环运行不止一次。这让我陷入了一个无限循环。

有什么建议吗?

    void Update () {
    MoveAndJump ();
    CheckDash ();
    }


void MoveAndJump(){
    if(dashing){
        return;
    }
    Vector2 moveDir = new Vector2 (Input.GetAxisRaw ("Horizontal") * moveSpeed, rb.velocity.y);
    rb.velocity = moveDir;
    // Consider Switching to an overlap circle based on the actual character graphic. This currently uses a rectangle
    // This can also use 4 points to create a more complex box shape. This only works well when using at least about 1 unit size. any smaller and it is innacurate
    isGrounded = Physics2D.OverlapArea (groundPoint_right.position, groundPoint_left.position, groundMask);
    Debug.Log (isGrounded);
    if (Input.GetAxisRaw ("Horizontal") == 1) {
        transform.localScale = new Vector3 (1 , 1 * transform.localScale.y, 1* transform.localScale.z);
    } else if (Input.GetAxisRaw ("Horizontal") == -1) {
        transform.localScale = new Vector3 (-1, 1* transform.localScale.y, 1* transform.localScale.z);
    }

    if(Input.GetKeyDown(KeyCode.Space) && isGrounded){
        rb.AddForce (new Vector2 (0, jumpHeight));
    }
}

void CheckDash(){
    if(Input.GetKeyDown(KeyCode.W) && !dashing && Time.time > nextdashtime){
        dashing = true;
        StartCoroutine ("Dash");
    }
}
IEnumerator Dash(){
    //Before dash loop
    rb.gravityScale = 0f;
    float startDashTime = Time.time;
    float endDashTime = startDashTime + dashDuration;
    float currentDashTime;
    //Dash Loop
    while(Time.time < (startDashTime + dashDuration)){
         currentDashTime = Time.time;
        // The value to lerp by should be the % that time.time is between start time and end time
        rb.velocity = new Vector2 (Mathf.Lerp (startDashSpeed, endDashSpeed, ((currentDashTime - startDashTime) / (endDashTime - startDashTime))),0f);
    }
    //When dash loop is complete
    nextdashtime = Time.time + dashcooldown;
    dashing = false;
    rb.gravityScale = 1;
    yield return null;
}

// FOR CHECKING GROUND CHECK LIMITS
/*void OnDrawGizmos(){
    Gizmos.color = Color.red;
    Gizmos.DrawLine (groundPoint_left.position, groundPoint_right.position);
}*/

}

using UnityEngine;
public class CubeController : MonoBehaviour
{
    private Rigidbody _rigidbody;
    public float Force = 10;
    private void Start()
    {
        _rigidbody = GetComponent<Rigidbody>();
    }
    private void FixedUpdate()
    {
        ForceMode? forceMode = null;
        if (Input.GetKeyDown(KeyCode.W)) // normal
            forceMode = ForceMode.Force;
        else if (Input.GetKeyDown(KeyCode.S)) // dash
            forceMode = ForceMode.Impulse;
        if (forceMode.HasValue)
            _rigidbody.AddRelativeForce(Vector3.forward*Force, forceMode.Value);
    }
}

 while(Time.time < (startDashTime + dashDuration)){
     currentDashTime = Time.time;
    // The value to lerp by should be the % that time.time is between start time and end time
    rb.velocity = new Vector2 (Mathf.Lerp (startDashSpeed, endDashSpeed, ((currentDashTime - startDashTime) / (endDashTime - startDashTime))),0f);
    yield return null;
}