Unity检测网络连接状态

Unity中有自带的判断是否连接网络的方法如下：

 if (Application.internetReachability == NetworkReachability.NotReachable)
        {
            text1.text = "Unity自带判断，没有联网";
            Debug.Log("Unity自带判断，没有联网");
        }
        else if (Application.internetReachability == NetworkReachability.ReachableViaCarrierDataNetwork)
        {
            Debug.Log("Unity自带，连接的移动网络");
        }
        else if (Application.internetReachability == NetworkReachability.ReachableViaLocalAreaNetwork)
        {
            Debug.Log("Unity自带，连接的wifi");
        }
        else
        {
            text1.text = "Unity自带判断，已经联网";
            Debug.Log("Unity自带判断，已经联网");
        }

但是这个方法在Unity编译器中测试着是没有问题的，但是将改程序打包成exe文件后就会发现，他无法判断没有联网的状态，

这时就需要使用C#中的方法去检测是否联网。

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using UnityEngine;
using UnityEngine.UI;

public class Test1 : MonoBehaviour {

    [DllImport("wininet")]
    private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);

    public Text text1;
    public Text text2;
    void Start () {
        StartCoroutine("delayPrint");
    }

    IEnumerator delayPrint()
    {
        yield return new WaitForSeconds(1f);


        if (Application.internetReachability == NetworkReachability.NotReachable)
        {
            text1.text = "Unity自带判断，没有联网";
            Debug.Log("Unity自带判断，没有联网");
        }
        else if (Application.internetReachability == NetworkReachability.ReachableViaCarrierDataNetwork)
        {
            text1.text = "Unity自带，连接的移动网络";
            Debug.Log("Unity自带，连接的移动网络");
        }
        else if (Application.internetReachability == NetworkReachability.ReachableViaLocalAreaNetwork)
        {
            text1.text = "Unity自带，连接的wifi";
            Debug.Log("Unity自带，连接的wifi");
        }
        else
        {
            text1.text = "Unity自带判断，已经联网";
            Debug.Log("Unity自带判断，已经联网");
        }

        if (IsConnectedInternet())
        {
            text2.text = "C#中判断，联网";
            Debug.Log("C#中判断，联网");
        }
        else
        {
            text2.text = "C#中判断，没有联网";
            Debug.Log("C#中判断，没有联网");
        }

        StartCoroutine("delayPrint");
    }

    /// <summary>
    /// C#判断是否联网
    /// </summary>
    /// <returns></returns>
    public bool IsConnectedInternet()
    {
        int i = 0;
        if (InternetGetConnectedState(out i,0))
        {
            return true;
        }
        else
        {
            return false;
        }
    }

}

这是在联网状态下的显示：

这是在断网情况下的显示：