这种返回值怎么定义的呢？

Question

        /// <summary>
        /// 根据sql语句获取news收集
        /// </summary>
        /// <param name="sql">注意：这里sql语句只能选择主键一个字段。 如: select ExpoID from CMS_Expo</param>
        /// <param name="pageIndex">当前页码</param>
        /// <param name="pageSize">每页显示的条数</param>
        /// <param name="includePageIndex">是否包含分页信息</param>
        /// <param name="returnFullThread">是否分页</param>
        /// <returns>CMS_Expo的集合</returns>
        public override CMS_ExpoCollection GetCMS_ExpoSet(string sql, int pageIndex, int pageSize, bool includePageIndex, bool returnFullThread)
        {
            using (SqlConnection myConnection = new SqlConnection(this.connectionString))
            {
                using (SqlCommand command = new SqlCommand("dbo.[RS_Get_CMS_ExpoSet]", myConnection))
                {
                    command.CommandType = CommandType.StoredProcedure;                    command.Parameters.Add("@PageIndex", SqlDbType.Int, 4).Value = pageIndex;
                    command.Parameters.Add("@PageSize", SqlDbType.Int, 4).Value = pageSize;
                    command.Parameters.Add("@sqlPopulate", SqlDbType.NText).Value = sql;
                    command.Parameters.Add("@IncludePageIndex", SqlDbType.Bit).Value = includePageIndex;
                    command.Parameters.Add("@ReturnFullThread", SqlDbType.Bit).Value = returnFullThread;
                    command.Parameters.Add("@TotalRecords", SqlDbType.Int).Direction = ParameterDirection.Output;                    CMS_ExpoCollection cms_expoSet = new CMS_ExpoCollection();                    // Execute the command
                    myConnection.Open();
                    using (SqlDataReader dr = command.ExecuteReader(CommandBehavior.CloseConnection))
                    {
                        while (dr.Read())
                        {
                            cms_expoSet.Add(PopulateCMS_ExpoEntryFromIDataReader(dr));
                        }                        if (includePageIndex)
                        {
                            dr.NextResult();
                            while (dr.Read())
                                cms_expoSet.PageIndex.Add(dr[0], dr[1]);
                        }                        dr.Close();
                        myConnection.Close();
                        cms_expoSet.TotalRecords = (int)command.Parameters["@TotalRecords"].Value;
                    }                    return cms_expoSet;
                }
            }
        }public override CMS_ExpoCollection GetCMS_ExpoSet  这种事如何定义的呢？ 做项目是 只知道调整，到不知道这个是如何定义做的？哪位高手能做个简单例子说明一下 谢谢。

Answer 1

CMS_ExpoCollection是一个自定义类.用来承载数据.

Answer 2

难懂啊 ，挺多代码的
/// <summary>
    /// CMS_ExpoCollection 的摘要说明。
    /// </summary>
    public class CMS_ExpoCollection : CollectionBase
    {
        public CMS_ExpoCollection()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }        SortedList pageIndex = new SortedList();
        int totalRecords = 0; //CMS_Expo的数目        public int TotalRecords
        {
            get
            {
                return totalRecords;
            }
            set
            {
                totalRecords = value;
            }
        }        public bool HasResults
        {
            get
            {
                if (this.Count > 0)
                    return true;
                return false;
            }
        }        public SortedList PageIndex
        {
            get
            {
                return pageIndex;
            }
            set
            {
                pageIndex = value;
            }
        }        public CMS_Expo this[int index]
        {
            get { return ((CMS_Expo)List[index]); }
            set { List[index] = value; }
        }        public int Add(CMS_Expo value)
        {
            return (List.Add(value));
        }        public int IndexOf(CMS_Expo value)
        {
            return (List.IndexOf(value));
        }        public void Insert(int index, CMS_Expo value)
        {
            List.Insert(index, value);
        }        public void Remove(CMS_Expo value)
        {
            List.Remove(value);
        }        public bool Contains(CMS_Expo value)
        {
            // If value is not of type Int16, this will return false.
            return (List.Contains(value));
        }        protected override void OnInsert(int index, Object value)
        {
            if (value.GetType() != Type.GetType("Fastener.Component.CMS_Expo"))
                throw new ArgumentException("value must be of type Fastener.Component.CMS_Expo.", "value");
        }        protected override void OnRemove(int index, Object value)
        {
            if (value.GetType() != Type.GetType("Fastener.Component.CMS_Expo"))
                throw new ArgumentException("value must be of type Fastener.Component.CMS_Expo.", "value");
        }        protected override void OnSet(int index, Object oldValue, Object newValue)
        {
            if (newValue.GetType() != Type.GetType("Fastener.Component.CMS_Expo"))
                throw new ArgumentException("newValue must be of type Fastener.Component.CMS_Expo.", "newValue");
        }        protected override void OnValidate(Object value)
        {
            if (value.GetType() != Type.GetType("Fastener.Component.CMS_Expo"))
                throw new ArgumentException("value must be of type Fastener.Component.CMS_Expo.");
        }
    }

Answer 3

namespace Pig
{
    public class PersonCollection : CollectionBase
    {
        public int Add(Person value) 
        {
            return this.List.Add(value);
        }        public bool Contains(Person value) 
        {
            return this.List.Contains(value);
        }        public int IndexOf(Person value) 
        {
            return this.List.IndexOf(value);
        }        public void Insert(int index, Person value)    
        {
            List.Insert(index, value);
        }        public void Remove(Person value) 
        {
            List.Remove(value);
        }
    }}namespace Happy
{
    public class Element
    {
        public int Number = 10;
    }
    public class Person
    {
        public string _Name = "";
        public string _Sex = "";
        public string _xuexiao = "";
        public string Name
        {
            get { return _Name; }
            set { _Name = value; }
        }
        public string Sex
        {
            get { return _Sex; }
            set { _Sex = value; }
        }
        public string xuexiao
        {
            get { return _xuexiao; }
            set { _xuexiao = value; }
        }
        public Person(){}
        public Person(string strname,string sex,string xuexiao)
        {
            this._Name = strname;
            this._Sex = sex;
            this._xuexiao = xuexiao;
        }
    }
    public class Test
    {
        public static Element Change(Element s)
        {
            Element r = new Element();
            r.Number = 100;
            return r;
        }
        public ArrayList alist()
        {            Person p = new Person();
            p.Name = "廖hongchu";
            p.Sex = "男";
            p.xuexiao = "梧州学院";
            Person p2 = new Person("诸葛亮","男","奇才学校");
            ArrayList toReturn = new ArrayList();
            toReturn.Add(p);
            toReturn.Add(p2);
            return toReturn;
        }
        public PersonCollection PersonSet()
        {
            Person p3 = new Person("曹操", "男", "奇才学校");
            Person p4 = new Person("周瑜", "男", "江东学校");
            PersonCollection personset = new PersonCollection();
            personset.Add(p3);
            personset.Add(p4);
            return personset;
        }
    }
}public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Happy.Element ey = new Happy.Element();
        Response.Write(ey.Number + "<br/> ");
        //Test.Change(ey);
        //Response.Write(ey.Number); 
        Happy.Element eyTest = Test.Change(ey);
        Response.Write(eyTest.Number);
        arraylist();
    }
    protected void arraylist()
    {
        
        Test test = new Test();
        ArrayList alis = test.alist();
        foreach (Person st in alis)
        {
            Label1.Text += st.Name + "  " + st.Sex + "  " + st.xuexiao+"<br>";
        }
        PersonCollection personcoll=test.PersonSet();        foreach (Person p in personcoll)
        {
            Label2.Text += p.Name + "  " + p.Sex + "  " + p.xuexiao + "<br>";
        }
    }
}自己弄了个 了解了 一点。

Answer 4

public class PersonCollection : CollectionBase  这里的方法 还是不清楚，继续看了