做最简单的自定义控件！

最新推荐文章于 2018-12-10 19:31:27 发布

转载最新推荐文章于 2018-12-10 19:31:27 发布 · 149 阅读

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原文链接：http://www.cnblogs.com/BeyondWJsel/archive/2012/03/22/2411670.html

本文介绍如何创建自定义ASP.NET控件，包括状态显示控件和封装的下拉框控件，用于简化重复代码，提高开发效率。通过实例展示了控件的实现和页面上的使用方法。

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

 1    public class ChatRoomMemberStateLabel:Label
 2     {
 3        private int _ChatRoomState;
 4        /// <summary>
 5 /// 交流室成员状态显示
 6 /// </summary>
 7        public int ChatRoomState
 8        {
 9            get { return _ChatRoomState; }
10            set
11            {
12                _ChatRoomState = value;
13                if (_ChatRoomState == (int)CommonState.Invalid)
14                {
15                    this.Text = "禁用";
16                }
17                else
18                {
19                    this.Text = "启用";
20                }
21            }
22        }
23     }

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>

</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！！！

转载于:https://www.cnblogs.com/BeyondWJsel/archive/2012/03/22/2411670.html