C#中用SslEmptyCache系统API来清除SSL状态

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如果需要编程实现IE选项中清除SSL状态的功能，可用SslEmptyCache函数，SslEmptyCache函数定义在Schannel.dll中，采用动态链接即可。

代码如下：

using System;
using System.Runtime.InteropServices;

namespace Demo
{
    public class Ssl
    {
        [DllImport("kernel32.dll")]
        internal static extern IntPtr LoadLibrary(String dllname);

        [DllImport("kernel32.dll")]
        internal static extern IntPtr GetProcAddress(IntPtr hModule, String procname);

        internal delegate bool SslEmptyCacheHelper(IntPtr targetName, int flags);

        /// <summary>
        /// UNICODE版
        /// </summary>
        /// <returns></returns>
        public bool SslEmptyCacheW()
        {
            IntPtr schannel = LoadLibrary("Schannel.dll");
            IntPtr procaddr = GetProcAddress(schannel, "SslEmptyCacheW");
            SslEmptyCacheHelper helper = (SslEmptyCacheHelper)Marshal.GetDelegateForFunctionPointer(procaddr, typeof(SslEmptyCacheHelper));
            return helper(IntPtr.Zero, 0);
        }

        /// <summary>
        /// ANSI版
        /// </summary>
        /// <returns></returns>
        public bool SslEmptyCacheA()
        {
            IntPtr schannel = LoadLibrary("Schannel.dll");
            IntPtr procaddr = GetProcAddress(schannel, "SslEmptyCacheA");
            SslEmptyCacheHelper helper = (SslEmptyCacheHelper)Marshal.GetDelegateForFunctionPointer(procaddr, typeof(SslEmptyCacheHelper));
            return helper(IntPtr.Zero, 0);
        }
    }

}

参考资料：

1、SslEmptyCache Function

2、.NET 2.0 中 GetDelegateForFunctionPointer 函数实现原理浅析 [草稿]