Class a = new Class()

{

    id = ,

    name = "张三"

}

//单例模式：确保一个类只有一个实例,并提供一个全局访问点。

public class Singleton

    {

        // 定义一个静态变量来保存类的实例

        private static Singleton uniqueInstance;

        // 定义私有构造函数，使外界不能创建该类实例

        private Singleton()

        {

        }

        /// <summary>

        /// 定义公有方法提供一个全局访问点,同时你也可以定义公有属性来提供全局访问点

        /// </summary>

        public static Singleton GetInstance()

        {

            // 如果类的实例不存在则创建，否则直接返回

            if (uniqueInstance == null || uniqueInstance.isDispose)

            {

                uniqueInstance = new Singleton();

            }

            return uniqueInstance;

        }

    }

Action<> //不带返回值

Func<>//带返回值

class Program

    {

        delegate int AddDel(int a,int b);

        /// <summary>

        /// 委托的内部构造分析

        /// </summary>

        /// <param name="AddInstanceFunc">方法指针</param>

        /// <param name="p">目标对象</param>

        /// <param name="del">所有的方法都在委托数组里</param>

        static void Main(string[] args)

        {

            AddDel del = new AddDel(AddStaticFunc);

            Program p = new Program();

            //多播委托的时候，拿到委托返回值是最后一个委托指向的方法的执行结果。

            del += p.AddInstanceFunc;

            int result = del(,);

            //

            Console.WriteLine(result);

            Console.ReadKey();

        }

        static int AddStaticFunc(int a, int b)

        {

            return a + b;

        }

        //实例方法

        public int AddInstanceFunc(int a, int b)

        {

            return a + b + ;

        }

    }

static void Main(string[] args)

{

            #region 泛型委托

            //Func<int, int, int> funDemo = new Func<int, int, int>(AddStaticFunc);

            //int result = funDemo(3,4);

            //Console.WriteLine(result);

            #endregion

            #region 匿名方法

            //Func<int, int, int> funDemo = delegate(int a, int b) { return a + b; };

            //int result = funDemo(3, 4);

            //Console.WriteLine(result);

            #endregion

            #region lambda

            //lambda语句

            //Func<int, int, int> funDemo = (int a, int b) => { return a + b; };

            //lambda表达式

            //Func<int, int, int> funDemo = (int a, int b) => a + b;

            //进一步演变为

            //Func<int, int, int> funDemo = (a, b) => a + b;

            //int result = funDemo(3, 4);

            //Console.WriteLine(result);

            #endregion

            #region 案例

            List<string> strlist = new List<string>() { "3","9","32","7"};

            //把集合中字符串小于6的打印出来

            var temp = strlist.Where(delegate(string a) { return a.CompareTo("6") < 0; });

            foreach (var item in temp)

            {

                Console.WriteLine(item);

            }

            #endregion

            Console.ReadKey();

        }

string[] imgPath;

imagePath = "../../Images";

imgPath = Directory.GetFiles(imagePath);

int j = ;

for (int i = ; i < imgPath.Length; i += )

     {

          List<string> imgPathList = new List<string>();

          imgPathList = imgPath.Take(j).Skip(i).ToList();

          j += ;

           imagePathListGroup.Add(imgPathList);

     }

for (int i = ; i < imagePathListGroup.Count; i++)

     {

          i = this.dgv_Image.Rows.Add();

          DataGridViewRow row = this.dgv_Image.Rows[i];

          row.Height = ;

          for (int j = ; j < imagePathListGroup[i].Count; j++)

              {

                   Image img = Image.FromFile(imagePathListGroup[i][j].ToString());

                   row.Cells[j].Value = img;

              }

      }

if (grouplist != null)

            {

                for (int i = ; i < grouplist.Count; i++)

                {

                    int index = this.dgvGroup.Rows.Add();

                    this.dgvGroup.Rows[index].Cells[].Value = grouplist[i].GroupID;

                    this.dgvGroup.Rows[index].Cells[].Value = grouplist[i].GroupName;

                }

            }

string groupName = dgvGroup.CurrentCell.Value.ToString();

string groupId = dgvGroup.CurrentRow.Cells[].Value.ToString();

string groupName = dgvGroup.Rows[dgvGroup.SelectedCells[].RowIndex].Cells["UserListColumn"].Value.ToString();

string groupName = dgvGroup.SelectedCells[].Value.ToString();