调用动态链接库API

        using System;
        using System.Runtime.InteropServices;
        namespace TransferAPI
        {
            /// <summary>
            /// APIClass 的摘要说明。
            /// </summary>
            class APIClass
            {
                [DllImport("user32.dll")]
                public static extern int MessageBox(int hWnd, string lpText, string lpCaption, int uType);
                /// <summary>
                /// 应用程序的主入口点。
                /// </summary>
                [STAThread]
                static void Main(string[] args)
                {
                    MessageBox(0, "调用C写的动态链接库与调用系统API函数类似", "调用系统API函数", 0);
                }
            }
        }