[英]How to check if the username existed in the User table of the database or not?
[英]How to check if Firewall rule existed
我有一个按钮,一旦点击,它就会向防火墙添加一个新规则。 但问题是它可以被多次点击并且会添加很多规则。
如何检查规则是否存在于防火墙中? (或者是否可以检查规则?)
这是我添加规则的代码:
ProcessStartInfo run = new ProcessStartInfo();
run.FileName = "cmd.exe";
run.Verb = "runas";
run.Arguments = "/C netsh advfirewall firewall add rule name=\"Block IP Rule\" dir=in interface=any action=block remoteip=x.x.x.x";
run.WindowStyle = ProcessWindowStyle.Hidden;
Process.Start(run);
public static void RemoveFirewallRules(string RuleName = "BreakermindCom")
{
try
{
Type tNetFwPolicy2 = Type.GetTypeFromProgID("HNetCfg.FwPolicy2");
INetFwPolicy2 fwPolicy2 = (INetFwPolicy2)Activator.CreateInstance(tNetFwPolicy2);
var currentProfiles = fwPolicy2.CurrentProfileTypes;
// Lista rules
List<INetFwRule> RuleList = new List<INetFwRule>();
foreach (INetFwRule rule in fwPolicy2.Rules)
{
// Add rule to list
//RuleList.Add(rule);
// Console.WriteLine(rule.Name);
if (rule.Name.IndexOf(RuleName) != -1)
{
// Now add the rule
INetFwPolicy2 firewallPolicy = (INetFwPolicy2)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwPolicy2"));
firewallPolicy.Rules.Remove(rule.Name);
Console.WriteLine(rule.Name + " has been deleted from Firewall Policy");
}
}
}
catch (Exception r)
{
Console.WriteLine("Error delete rule from firewall");
}}
作品... :}
您可以在将防火墙规则初始化为选择性/特定时使用 linq。
对于具有相同名称的多个防火墙规则:
INetFwPolicy2 firewallPolicy = (INetFwPolicy2)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwPolicy2"));
List<INetFwRule> firewallRules = firewallPolicy.Rules.OfType<INetFwRule>().Where(x => x.Name.Contains(fwRuleName)).ToList();
foreach (INetFwRule rule in firewallRules)
{
firewallPolicy.Rules.Remove(rule.Name);
}
对于单个防火墙规则:
INetFwPolicy2 firewallPolicy = (INetFwPolicy2)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwPolicy2"));
INetFwRule firewallRule = firewallPolicy.Rules.OfType<INetFwRule>().Where(x => x.Name == fwRuleName).FirstOrDefault();
firewallPolicy.Rules.Remove(firewallRule.Name);
但是,如果您已经知道防火墙规则名称,您也可以这样做(未经测试,但没有Where
子句):
INetFwPolicy2 firewallPolicy = (INetFwPolicy2)Activator.CreateInstance(Type.GetTypeFromProgID("HNetCfg.FwPolicy2"));
firewallPolicy.Rules.Remove(fwRuleName);
重点是展示 linq 语法以及能够使用它搜索特定名称、模式等的灵活性。
WindowsFirewallHelper 类。 作为 VS 的 NuGet 包提供。 我寻找了几天的解决方案并找到了这个。 一个非常重要的项目改变了我的生活。
这是执行您想要的操作的代码:
private void initFWrule(object sender, EventArgs e) { Console.WriteLine("CHECKING FIREWALL RULE EXISTENCE"); var myRule = FirewallManager.Instance.Rules.SingleOrDefault(r => r.Name == "BlockUTG_Port-26881"); //substitute your rule name in place of BlockUTG_Port-26881 above try { if (myRule != null) { Console.WriteLine("Rules DOES Exist"); } else { Console.WriteLine("Rules DOES NOT Exist"); //run your code here to create rule } } catch (Exception ex) { MessageBox.Show(ex.Message); }
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