做最简单的自定义控件！

一、在做项目时候通常会用到一些通用的控件，比如说一些表的状态，为了不至于每个界面写相同代码，底下写了一个Lable和Dropdowlist。详细如下： 

        1、//显示Lable状态控件    

   public class ChatRoomMemberStateLabel:Label
    {
       private int _ChatRoomState;
       /// <summary>
/// 交流室成员状态显示
/// </summary>
       public int ChatRoomState
       {
           get { return _ChatRoomState; }
           set
           {
               _ChatRoomState = value;
               if (_ChatRoomState == (int)CommonState.Invalid)
               {
                   this.Text = "禁用";
               }
               else
               {
                   this.Text = "启用";
               }
           }
       }
    }

       2、对应插入下拉框代码  

    /// <summary>
    /// 封装试题题型下拉框
    /// </summary>
    public class ComDraftTypeDrop:DropDownList
    {
        private bool _TrySelectedValueSelected;                                       //代表是否有默认值
        private string _TryAllContainsValue;                                         //是否包含《全部》选项
        protected override void OnInit(EventArgs e)
        {
            DraftQuestionTypeLogic cStrDraftQuestionTypeLogic = new DraftQuestionTypeLogic();
            DraftQuestionTypeList cStrDraftQuestionTypeList = new DraftQuestionTypeList();
            cStrDraftQuestionTypeList = cStrDraftQuestionTypeLogic.GetListAll();
            foreach (DraftQuestionType cDraftQuestionType in cStrDraftQuestionTypeList)
            {
                this.Items.Add(new ListItem(cDraftQuestionType.QuestionTypeName, string.Format("{0}:{1}", cDraftQuestionType.DraftQuestionTypeId.ToString(), cDraftQuestionType.ComplexTypeFlag.ToString())));
            }
            if (!string.IsNullOrEmpty(_TryAllContainsValue))
            {
                Items.Insert(0, new ListItem("全部", "-1"));
            }
            base.OnInit(e);
        }

        public string TrySelectedValue
        {
            get { return SelectedValue; }
            set
            {
                foreach (ListItem li in this.Items)
                {
                    if("-1".Equals(li.Value))
                    {
                       continue;
                    }
                    string[] aStrArray = li.Value.Split(':');
                    if (aStrArray[0] == value)
                    {
                        SelectedValue = value;
                        _TrySelectedValueSelected = true;
                    }
                }
                if (_TrySelectedValueSelected == false)
                {
                    SelectedIndex = 0;
                }
            }
        }


        /// <summary>
        ///   是否包含《全部》选项
        /// </summary>
        public string TryContainsAllValue
        {
            get { return _TryAllContainsValue; }
            set
            {
                if (!string.IsNullOrEmpty(value))
                {
                    _TryAllContainsValue = value;
                }
            }
        }
    }

    3、页面使用，导入控件所在的命名空间,注册方式有两种，一种是页面注册，另一种是web.config注册

       <%@ Register Assembly="Open.ItemBank.Controls" Namespace="Open.ItemBank.Controls" TagPrefix="cc1" %>//页面

       <pages styleSheetTheme="Default" controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID">  //web.config注册，推荐用这一种

                <controls>          

                  <add tagPrefix="itembank" namespace="Open.ItemBank.Controls" assembly="Open.ItemBank.Controls"/>       

               </controls>   

        </pages>

       使用时候如：

       <itembank:ChatRoomMemberStateLabel ID="CommonStateLabel" runat="server" ChatRoomState=“0”></itembank:ChatRoomMemberStateLabel>       

       <cc1:ChatRoomMemberStateLabel ID="CommonStateLabel" runat="server" ChatRoomState=“0”></cc1:ChatRoomMemberStateLabel>      

       希望对大家有所帮助！！！