C#调用动态链接库

1.将DLL复制到工程下

2.添加如下代码

        [DllImport("DLL.dll")]
        public static extern int Add(int a, int b);

        private void button1_Click(object sender, EventArgs e)
        {
            string str;
            str = Add(5,3).ToString();
            MessageBox.Show(str);
        }