C# this关键字的四种用法

namespace Demo
{
    public class Test
    {
        private string scope = "全局变量";
        public string getResult()
        {
            string scope = "局部变量";
　　　　　　　// this代表Test的实例对象
　　　　　　　// 所以this.scope对应的是全局变量
　　　　　　  // scope对应的是getResult方法内的局部变量
            return this.scope + "-" + scope;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Test test = new Test();
                Console.WriteLine(test.getResult());
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
            finally
            {
                Console.ReadLine();
            }

        }
    }
}

namespace Demo
{
    public class Test
    {
        public Test()
        {
            Console.WriteLine("无参构造函数");
        }
        // this()对应无参构造方法Test()
　　　　 // 先执行Test()，后执行Test(string text)
        public Test(string text) : this()
        {
            Console.WriteLine(text);
            Console.WriteLine("有参构造函数");
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                Test test = new Test("张三");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
            finally
            {
                Console.ReadLine();
            }
        }
    }
}

namespace Demo
{
    public static class Extends
    {
　　　　 // string类型扩展ToJson方法
        public static object ToJson(this string Json)
        {
            return Json == null ? null : JsonConvert.DeserializeObject(Json);
        }
        // object类型扩展ToJson方法
        public static string ToJson(this object obj)
        {
            var timeConverter = new IsoDateTimeConverter { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" };
            return JsonConvert.SerializeObject(obj, timeConverter);
        }
        public static string ToJson(this object obj, string datetimeformats)
        {
            var timeConverter = new IsoDateTimeConverter { DateTimeFormat = datetimeformats };
            return JsonConvert.SerializeObject(obj, timeConverter);
        }
        public static T ToObject(this string Json)
        {
            return Json == null ? default(T) : JsonConvert.DeserializeObject(Json);
        }
        public static List ToList(this string Json)
        {
            return Json == null ? null : JsonConvert.DeserializeObject>(Json);
        }
        public static DataTable ToTable(this string Json)
        {
            return Json == null ? null : JsonConvert.DeserializeObject(Json);
        }
        public static JObject ToJObject(this string Json)
        {
            return Json == null ? JObject.Parse("{}") : JObject.Parse(Json.Replace(" ", ""));
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                List users = new List{
                    new User{ID="1",Code="zs",Name="张三"},
                    new User{ID="2",Code="ls",Name="李四"}
                };

                // list转化json字符串
                string json = users.ToJson();
　　　　　　　　　 // string转化List
                users = json.ToList();

                // string转化DataTable
                DataTable dt = json.ToTable();
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex);
            }
            finally
            {
                Console.ReadLine();
            }
        }
    }

    public class User
    {
        public string ID { get; set; }
        public string Code { get; set; }
        public string Name { get; set; }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace MyDemo.Web
{
    /// 

    /// EPList 支持为List创建索引
    /// 
    /// 类型
    public class EPList
    {
        #region 成员变量

        /// 

        /// 索引
        /// 
        private List m_Index = new List();

        /// 

        /// 缓存数据
        /// 
        private Dictionary> m_CachedData = new Dictionary>();

        /// 

        /// List数据源
        /// 
        private List m_ListData = new List();

        /// 

        /// 通过索引值取数据
        /// 
        /// 索引字段
        /// 字段值
        /// 
        public List this[string[] indexFields]
        {
            get
            {
                string key = string.Join(",", indexFields);
                if (m_CachedData.ContainsKey(key)) return m_CachedData[key];
                return new List();
            }
        }

        #endregion

        #region 公共方法

        /// 

        /// 创建索引
        /// 
        /// 索引字段
        public void CreateIndex(string[] indexFields)
        {
            if (m_Index.Contains(indexFields)) return;
            m_Index.Add(indexFields);
        }

        /// 

        /// 添加
        /// 
        /// 记录
        public void Add(T record)
        {
            m_ListData.Add(record);
            m_Index.ForEach(indexFields =>
            {
                string key = getKey(record, indexFields);
                if (m_CachedData.ContainsKey(key))
                {
                    m_CachedData[key].Add(record);
                }
                else
                {
                    List list = new List { record };
                    m_CachedData.Add(key, list);
                }
            });
        }

        #endregion

        #region 私有方法

        /// 

        /// 获取值
        /// 
        /// 记录
        /// 字段名
        /// 
        private object getValue(T record, string fieldName)
        {
            Type type = typeof(T);
            PropertyInfo propertyInfo = type.GetProperty(fieldName);
            return propertyInfo.GetValue(record, null);
        }

        /// 

        /// 获取Key
        /// 
        /// 记录
        /// 索引字段
        private string getKey(T record, string[] indexFields)
        {
            List values = new List();
            foreach (var field in indexFields)
            {
                string value = Convert.ToString(getValue(record, field));
                values.Add(field + ":" + value);
            }
            return string.Join(",", values);
        }

        /// 

        /// 获取Key
        /// 
        /// 索引字段
        /// 字段值
        /// 
        private string getKey(string[] indexFields, object[] fieldValues)
        {
            if (indexFields.Length != fieldValues.Length) return string.Empty;
            for (int i = 0; i 

private EPList GetEPListData()
{
    EPList eplist = new EPList();
    eplist.CreateIndex(new string[] { "ParentId" });
    string sql = "select Id,ParentId,Code,Name from SysDepart";
    SqlHelper.ExecuteReader(sql, null, (reader) =>
    {
        SysDepartInfo record = new SysDepartInfo();
        record.Id = Convert.ToString(reader["Id"]);
        record.ParentId = Convert.ToString(reader["ParentId"]);
        record.Code = Convert.ToString(reader["Code"]);
        record.Name = Convert.ToString(reader["Name"]);
        eplist.Add(record);
    });
    return eplist;
}

/// 

/// 获取子节点
/// 
/// 
/// 
private IEnumerable CreateChildren(EPList data, TreeInfo node)
{
    string id = node == null ? "0" : node.id;
    List childNodes = new List();
    // ParentId字段上创建了索引，所以这里就可以通过索引值直接取出下一层子节点数据，避免Linq查询引发的效率问题
    var indexValues = new string[] { "ParentId:" + id };
    var childData = data[indexValues];
    childData.ForEach(record =>
    {
        var childNode = new TreeInfo
        {
            id = record.Id,
            text = record.Code + " " + record.Name
        };
        childNodes.Add(childNode);
        childNode.children = CreateChildren(data, childNode);
    });
    return childNodes.OrderBy(record => record.text);
}