LINQ中ForEach方法的使用

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LINQ中ForEach方法的使用。

1、实例一：使用ForEach获取列表中的某个字段值

/// <summary>/// 使用ForEach获取列表中员工名称字段/// </summary>static void Main(string[] args){    List<Emplayee> emplayeeList = GetEmplayeeList();  //获取员工信息列表      string empNames = "";                             //员工名称字段    emplayeeList.ForEach(a => empNames += a.EmplayeeName + ",");    empNames = empNames.TrimEnd(',');    Console.WriteLine(empNames);                     //输出：张三,李四,王五}

2、实例二：使用ForEach将部门列表与员工列表关联

/// <summary>  /// 使用ForEach将部门列表与员工列表关联 /// </summary>   public static void JoinDepartmentList(){    List<Department> departmentList = GetDepartmentList();   //获取部门信息列表      List<Emplayee> emplayeeList = GetEmplayeeList();         //获取员工信息列表      departmentList.ForEach(a => a.EmplayeeList = emplayeeList.Where(e => e.DepartmentId == a.DepartmentId).ToList());    //使用ForEach输入结果    departmentList.ForEach(a => Console.WriteLine(String.Format("{0}:员工数量：{1}", a.DepartmentName, a.EmplayeeList.Count)));}

其它代码：

/// <summary>  /// 部门信息类  /// </summary>  public class Department{    /// <summary>      /// 部门ID      /// </summary>      public int DepartmentId { get; set; }    /// <summary>      /// 部门名称      /// </summary>      public string DepartmentName { get; set; }    /// <summary>    /// 员工列表    /// </summary>    public List<Emplayee> EmplayeeList { get; set; }}  /// <summary>  /// 员工信息类  /// </summary>  public class Emplayee{    /// <summary>      /// 员工姓名      /// </summary>      public string EmplayeeName { get; set; }    /// <summary>      /// 部门ID      /// </summary>      public int DepartmentId { get; set; }}

/// <summary>  /// 获取员工信息列表  /// </summary>  /// <returns></returns>  public static List<Emplayee> GetEmplayeeList(){    List<Emplayee> emplayeeList = new List<Emplayee>();    Emplayee emplayee1 = new Emplayee() { EmplayeeName = "张三", DepartmentId = 1, };    Emplayee emplayee2 = new Emplayee() { EmplayeeName = "李四", DepartmentId = 2, };    Emplayee emplayee3 = new Emplayee() { EmplayeeName = "王五", DepartmentId = 2, };    emplayeeList.Add(emplayee1);    emplayeeList.Add(emplayee2);    emplayeeList.Add(emplayee3);    return emplayeeList;}/// <summary>  /// 获取部门信息列表  /// </summary>  /// <returns></returns>  public static List<Department> GetDepartmentList(){    List<Department> departmentList = new List<Department>();    Department department1 = new Department() { DepartmentId = 1, DepartmentName = "研发部" };    Department department2 = new Department() { DepartmentId = 2, DepartmentName = "人事部" };    Department department3 = new Department() { DepartmentId = 3, DepartmentName = "财务部" };    departmentList.Add(department1);    departmentList.Add(department2);    departmentList.Add(department3);    return departmentList;}

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