Is there a way to flush the DNS cache from a C# WPF app? (on XP, Vista, Win7)

c# .net caching dns flush
Greg picture Greg · Aug 17, 2010 · Viewed 12.8k times · Source

Is there a way to flush the DNS cache from a C# WPF app? The application would be running on either XP, Vista, or Windows 7.

Answer

Mike Webb picture Mike Webb · Feb 28, 2011

You can use a function from Microsoft's "dnsapi.dll". This will allow you to do this completely programmatically:

using System.Runtime.InteropServices;

[DllImport("dnsapi.dll",EntryPoint="DnsFlushResolverCache")]
private static extern UInt32 DnsFlushResolverCache ();

public static void FlushMyCache() //This can be named whatever name you want and is the function you will call
{
    UInt32 result = DnsFlushResolverCache();
}

I have tested this and it works great.

Related questions

MemoryCache does not obey memory limits in configuration

I’m working with the .NET 4.0 MemoryCache class in an application and trying to limit the maximum cache size, but in my tests it does not appear that the cache is actually obeying the limits. I'm using the settings which, …

Read More
Activation error occured while trying to get instance of type ICacheManager, key "Cache Manager"

I seem to have hit a wall here and would appreciate some help from anyone who is able to on this one. I am not exactly sure what the error message below means. I am using the Caching Block of …

Read More
Using multiple instances of MemoryCache

I'd like to add caching capabilities to my application using the System.Runtime.Caching namespace, and would probably want to use caching in several places and in different contexts. To do so, I want to use several MemoryCache instances. However, …

Read More