二、自定义控件之RadioButtonList

昨天下午弄了一个CheckBoxList 功能暂够用……今早 同样 整了一个RadioButtonList……

发现一个问题

如果这样写

[ToolboxData("<{0}:FBSRadioBtnList runat=server></{0}:FBSRadioBtnList>")]
    public class FBSRadioBtnList : System.Web.UI.WebControls.RadioButtonList
    {
        #region Field
        private string radioText;
        private string radioValue;
        #endregion
        #region Properties
        [Description("Text值"), Browsable(true), DefaultValue(""), Category("Appearance")]
        public string RadioText
        {
            get
            { 
                return radioText;
            }
            set
            {
                radioText = value;
            }
        }
        [Description("Value值"), Browsable(true), DefaultValue(""), Category("Appearance")]
        public string RadioValue
        {
            get
            { 
                return radioValue;
            }
            set
            {
                radioValue = value;
            }
        }
        #endregion
        #region Control
        protected override void Render(HtmlTextWriter writer)
        {
            base.Render(writer);
        }

        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);
            //取值
            for (int i = 0; i < this.Items.Count; i++)
            {
                if (this.Items[i].Selected == true)
                    RadioText = Items[i].Text;
            }
            if (string.IsNullOrEmpty(RadioText))
                RadioText = "请选择";
            //设置 默认选中
            if (!string.IsNullOrEmpty(RadioText))
            {
                this.SelectedIndex = -1;
                for (int j = 0; j < this.Items.Count; j++)
                {
                    if (string.Equals(Items[j].Text, RadioText, StringComparison.InvariantCultureIgnoreCase))
                    {
                        this.Items[j].Selected = true;
                    }
                }
            }
        }
        #endregion
    }

前台调用时

   protected void FBSRadioBtnList_Click(object sender, EventArgs e)
        {
            Label2.Text = "取值：Value:" + FBSRadioBtnList1.RadioValue + " Text:" + FBSRadioBtnList1.RadioText;
        }

        protected void FBSRadioBtnListSet_Click(object sender, EventArgs e)
        {
            FBSRadioBtnList1.RadioValue = "1";
            Label2.Text = "设置默认选择：Value:" + FBSRadioBtnList1.RadioValue + "</br> Text:" + FBSRadioBtnList1.RadioText;
        }

取不到值…………

经调试 发现button事件 回发……按钮事件 先执行了按钮事件中方法 其次才去执行

protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);
            //取值
            for (int i = 0; i < this.Items.Count; i++)
            {
                if (this.Items[i].Selected == true)
                    RadioText = Items[i].Text;
            }
            if (string.IsNullOrEmpty(RadioText))
                RadioText = "请选择";
            //设置 默认选中
            if (!string.IsNullOrEmpty(RadioText))
            {
                this.SelectedIndex = -1;
                for (int j = 0; j < this.Items.Count; j++)
                {
                    if (string.Equals(Items[j].Text, RadioText, StringComparison.InvariantCultureIgnoreCase))
                    {
                        this.Items[j].Selected = true;
                    }
                }
            }
        }

所以 每次得到的值都是Null

但是 如果 我把方法直接写到属性中 即可

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web.UI;
using System.ComponentModel;

namespace FumaCRM_BS.WebControls
{
    [ToolboxData("<{0}:FBSRadioBtnList runat=server></{0}:FBSRadioBtnList>")]
    public class FBSRadioBtnList : System.Web.UI.WebControls.RadioButtonList
    {
        #region Properties
        [Description("Text值"), Browsable(true), DefaultValue(""), Category("Appearance")]
        public string RadioText
        {
            get
            {
                string strText = string.Empty;
                for (int i = 0; i < this.Items.Count; i++)
                {
                    if (this.Items[i].Selected == true)
                        return Items[i].Text;
                }
                if (string.IsNullOrEmpty(strText))
                    strText = "请选择";
                return strText;
            }
            set
            {
                if (value != null && value != string.Empty && value != "")
                {
                    this.SelectedIndex = -1;
                    string strText = value;
                    for (int j = 0; j < this.Items.Count; j++)
                    {
                        if (string.Equals(Items[j].Text, strText, StringComparison.InvariantCultureIgnoreCase))
                        {
                            this.Items[j].Selected = true;
                        }
                    }
                }
            }
        }
        [Description("Value值"), Browsable(true), DefaultValue(""), Category("Appearance")]
        public string RadioValue
        {
            get
            {
                string strValue = string.Empty;
                for (int i = 0; i < this.Items.Count; i++)
                {
                    if (this.Items[i].Selected == true)
                        return Items[i].Value;
                }
                if (string.IsNullOrEmpty(strValue))
                    strValue = "请选择";
                return strValue;
            }
            set
            {
                if (value != null && value != string.Empty && value != "")
                {
                    this.SelectedIndex = -1;
                    string strText = value;
                    for (int j = 0; j < this.Items.Count; j++)
                    {
                        if (string.Equals(Items[j].Value, strText, StringComparison.InvariantCultureIgnoreCase))
                        {
                            this.Items[j].Selected = true;
                        }
                    }
                }
            }
        }
        #endregion
        #region Control
        protected override void Render(HtmlTextWriter writer)
        {
            base.Render(writer);
        }
 
        #endregion
    }
}

经调试 得到我想要到结果

刚接触 自定义控件  ……还请园中 前辈 指教 ……

谢谢

×××××如果前辈您有相关开发自定义控件 是否可以 提供一份给我 pepe_anhwei@126.com  谢谢×××××