如何在.NET google api v3中刷新令牌？

Question

var cred=googleCredential.fromAccessToken(access_token);

<GoogleLogin
                  
                  clientId="xxx"
                  buttonText="Login"
                  onSuccess={this.responseGoogle}
                  onFailure={this.responseGoogle}
                  cookiePolicy={"single_host_origin"}
                  scope="https://www.googleapis.com/auth/drive.readonly"
                  accessType="offline"
                  prompt="consent"
                  responseType="code"
                />

this.googleCredentials=GoogleCredential.FromAccessToken(this.googleAccessToken);