DropDownList绑定及修改

DropDownList绑定及修改

http://www.cnblogs.com/hulang/archive/2010/12/29/1920662.html

 

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一、DropDownList: 1、选项值保存到数据库： Hashtable ht=new Hashtable();//这里用Hashtable ht.Add("字段名"，DropDownListID.SelectedItem.Text.ToString());//保存选项Text ht.Add("字段名"，DropDownListID.SelectedItem.Value.ToString());//保存选项Value 2、选项值由数据库绑定到DropDownList： 首先DropDownListID.ClearSelection();//清除选项 DropDownListID.Items.FindByText(dr["字段名"].ToString()).Selected = true;//选项Text DropDownListID.Items.FindByValue(dr["字段名"].ToString()).Selected = true;//选项Value 二、RadioButtonList: 1、选项值保存到数据库(同DropDownList)： Hashtable ht=new Hashtable();//这里用Hashtable ht.Add("字段名"，RadioButtonListID.SelectedItem.Text.ToString());//保存选项Text ht.Add("字段名"，RadioButtonListID.SelectedItem.Value.ToString());//保存选项Value 2、选项值由数据库绑定到RadioButtonList string SelectItem = dr["字段名"].ToString();//将数据库中的选项值从DataRow中读出赋给变量SelectItem for (int i = 0; i < RadioButtonListID.Items.Count; i++) {//用for循环判断那项被选种 if (RadioButtonListID.Items[i].Text == SelectItem)RadioButtonListID.Items[i].Selected = true; } 三、CheckBoxList: 1、选项值保存到数据库 string SelectItem = "";//声明一个变量来接受选项 for (int i = 0; i < CheckBoxListID.Items.Count; i++) {//用for循环将所有选项用","隔开连接起来 if (CheckBoxListID.Items[i].Selected) { SelectItem = SelectItem + CheckBoxListID.Items[i].Value + ",";//选项后加","隔开 } } ht.Add("字段名",SelectItem.ToString()); 2、选项值由数据库绑定到CheckBoxList string SelectItem = dr["字段名"].ToString(); string[] arrStr = SelectItem.Split(',');//字段是以","隔开 foreach (string str in arrStr) { for (int i = 0; i <CheckBoxListID.Items.Count; i++) { if (this.CheckBoxListID.Items[i].Value == str) { this.CheckBoxListID.Items[i].Selected = true; } } } ================================================= 1.把数据绑定到CheckBoxList中 protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { SqlConnection con = GetDBCon.GetCon(); con.Open(); SqlDataAdapter sda = new SqlDataAdapter("select * from admin", con); DataSet ds = new DataSet(); sda.Fill(ds,"admin"); this.CheckBoxList1.DataSource = ds.Tables[0]; this.CheckBoxList1.DataTextField = "username";//绑定的字段名 this.CheckBoxList1.DataValueField = "userid";//绑定的值 this.CheckBoxList1.DataBind(); } } 2.循环读取出来 protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e) { this.Lab2.Text = ""; for (int i = 0; i < CheckBoxList1.Items.Count; i++) { if (this.CheckBoxList1.Items[i].Selected) { this.Lab2.Text = this.Lab2.Text+CheckBoxList1.Items[i].Text+"."; } } }