c# - 模拟网络故障

Question

我使用网络服务编写了一个应用程序，我想模拟网络故障以进行测试。我知道我可以手动关闭网络，但如果它能自动关闭那就太棒了。

我尝试了以下解决方案:How to simulate network failure for test purposes (in C#)?来自 Larsenal 但它不识别 ManagementClass/ObjectCollection/... 我不知道为什么(我使用了 System.Managment.Man... 但它仍然没有用。我导入了所需的引用 - 没有'不工作。我不知道我做错了什么)

它应该像这样工作:

[TestMethod]
public void Service_Login_NoInternetConnection()
{
  // Some code...
  TurnOffNetworkConnection();
  // More code...
  TurnOnNetworkConnection();
  // Blablabla code...
}

Answer 1

您可以为此使用 WMI。

首先确保添加引用:System.Management

然后我得到所有设备:
"ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\CIMV2", "SELECT * FROM Win32_NetworkAdapterConfiguration");"

现在我需要检查设备是否获得了 DHCPLeaseObtained。
所以我使用 foreach 来检查搜索器中的每个网络设备:
String Check = Convert.ToString(queryObj["DHCPLeaseObtained"]);

如果设备没有 DHCPLeaseObtained 字符串将为空。所以我检查字符串是否为空:
如果 (String.IsNullOrEmpty(检查))

然后你可以在else中使用ReleaseDHCPLease和RenewDHCPLease。
ManagementBaseObject outParams = queryObj.InvokeMethod("ReleaseDHCPLease", null, null);
或者
ManagementBaseObject outParams = queryObj.InvokeMethod("RenewDHCPLease", null, null);

using System.Management;


    public void TurnOnNetworkConnection()
{

        try
        {
            ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_NetworkAdapterConfiguration");

               foreach (ManagementObject queryObj in searcher.Get())
               {
                  String Check = Convert.ToString(queryObj["DHCPLeaseObtained"]);
                  if (String.IsNullOrEmpty(Check))
                    {
                    }
                    else
                    {
                    ManagementBaseObject outParams = queryObj.InvokeMethod("RenewDHCPLease", null, null);
                    }
               }
         }
           catch (ManagementException e)
           {
           MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
           }
}

    public void TurnOffNetworkConnection()
{
        try
        {
            ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\CIMV2", "SELECT * FROM Win32_NetworkAdapterConfiguration"); 

            foreach (ManagementObject queryObj in searcher.Get())
            {
                String Check = Convert.ToString(queryObj["DHCPLeaseObtained"]);
                if (String.IsNullOrEmpty(Check)) 
                {
                }
                else
                {
                    ManagementBaseObject outParams = queryObj.InvokeMethod("ReleaseDHCPLease", null, null);
                }
            }
        }
        catch (ManagementException e)
        {
            MessageBox.Show("An error occurred while querying for WMI data: " + e.Message);
        }
}