设置和获取DropDownList的值的简单方法

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我是靠谱客的博主美满蜡烛，最近开发中收集的这篇文章主要介绍设置和获取DropDownList的值的简单方法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

设置和获取DropDownList的值的通用方法

1. 设置Dropdwonlist的方法

       /// <summary>
        /// Set DropDownList Value by ddlvalue
        /// 0,value;
        /// 1,text;
        /// -1,selectedIndex
        /// </summary>
        /// <param name="ddl">DropDownList</param>
        /// <param name="ddlvalue">the Value or Text of DropDownList</param>
        /// <param name="mode">0 as SelectedValue,1 as SelectedText,-1 as SelectIndex</param>
        protected void SetDdlValue(DropDownList ddl, string ddlvalue, int mode)
        {
            if (!String.IsNullOrEmpty(ddlvalue))
            {
                if (mode == 0)
                {
                    ddl.SelectedIndex = ddl.Items.IndexOf(ddl.Items.FindByValue(ddlvalue));
                }
                else if (mode == 1)
                {
                    int i = ddl.Items.IndexOf(ddl.Items.FindByText(ddlvalue));
                    if (i == -1)
                    {
                        ddl.Items.Insert(0, ddlvalue);
                        ddl.SelectedIndex = 0;
                    }
                    else
                        ddl.SelectedIndex = i;
                }
                else if (mode == -1)
                {
                    ddl.SelectedIndex = int.Parse(ddlvalue);
                }
                else
                {
                    ddl.SelectedIndex = -1;
                }
            }

          else
           {
                 ddl.SelectedIndex = -1;
           }

        }

2.获取DropDownList的方法

       /// <summary>
        /// Get DropDownList Selected Item's value of Selected Item's text
        /// 0,value;
        /// 1 text;
        /// -1,selectedindex
        /// </summary>
        /// <param name="ddl"></param>
        /// <param name="mode">0 as SelectedValue,1 as SelectedText,-1 as SelectIndex</param>
        /// <returns></returns>
        protected string GetDdlValue(DropDownList ddl, int mode)
        {
            if (mode == 0)
                return ddl.SelectedValue;
            else if (mode == 1)
                return ddl.SelectedItem.Text.ToString();
            else
                return ddl.SelectedIndex.ToString();
        }