本文给大家分享web中 DropDownList绑定数据源的几种方式，先给大家分享三种常见的方式，具体详情如下所示：

第一种

this.ddltype.DataTextField = "btName";//显示的值 this.ddltype.DataValueField = "btId";//获取dropdownlist中的值 ddltype.DataSource = service.GetBusinessTypeAll(""); this.ddltype.DataBind();

第二种

DataTable dt_GetBusinessName = service.GetBusinessTypeAll(""); //表中无数据的话直接返回 if (dt_GetBusinessName == null) return; for (int i = 0; i < dt_GetBusinessName.Rows.Count; i++) { ddltype.Items.Add(new ListItem(dt_GetBusinessName.Rows[i]["btName"].ToString().Trim(),//显示的值 dt_GetBusinessName.Rows[i]["btId"].ToString().Trim())); }s ddltype.Items.Add(new ListItem("全部", "-1")); ddltype.Text = "全部";

如何选中DropDownList1中的值用

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { this.TextBox1.Text = this.DropDownList1.SelectedItem.Text.ToString(); }

第三种：

protected void ddl_bumen_SelectedIndexChanged(object sender, EventArgs e) { if (this.ddl_bumen.Text != "选择部门") { int id = Int32.Parse(this.ddl_bumen.Text); SqlParameter bumen = new SqlParameter("@dept_id", id); IList<lbEmploy> list = BLLGeneric.Select<lbEmploy>(CommandType.StoredProcedure, "lb_liandong", bumen); //配置数据源 this.ddl_em.DataSource = list; //绑定字段属性 this.ddl_em.DataTextField = "Em_name"; this.ddl_em.DataValueField = "Em_name"; //绑定控件 this.ddl_em.DataBind(); } else { this.Response.Write(string.Format(GetRedirect.WINALERT, "请选择部门")); this.ddl_bumen.Focus(); return; } }

下面看下DropdownList控件动态绑定数据源的两种方法

DropdownList控件绑定数据源示例，本文提供两种方法，皆为动态绑定

动态绑定方法一：动态绑定数据库中的字段。

SqlConnection conn = UtilitySqlClass.OperateDataBase.ReturnConn();string strSQL = "select * from CompanyType";SqlDataAdapter ada = new SqlDataAdapter(strSQL, conn);DataSet ds = new DataSet();ada.Fill(ds, "CompanyType");DropDownList1.DataSource = ds.Tables["CompanyType"].DefaultView;DropDownList1.DataValueField = ds.Tables["CompanyType"].Columns[1].ColumnName;DropDownList1.DataTextField = ds.Tables["CompanyType"].Columns[1].ColumnName;DropDownList1.DataBind();ds.Dispose();

动态绑定方法二：利用DropDownList.Items.Add方法。

protected void Page_Load(object sender, EventArgs e){if (!IsPostBack){SqlConnection conn = UtilitySqlClass.OperateDataBase.ReturnConn();try{conn.Open();this.DropDownList1.Items.Add("");string strSQL = "select CompanyType from CompanyType";SqlCommand com = new SqlCommand(strSQL, conn);SqlDataReader dr = com.ExecuteReader();while (dr.Read()){this.DropDownList1.Items.Add(dr["CompanyType"].ToString());}}catch (Exception ex){Response.Write("<scirpt>alert('" + ex.Message.ToString() + "')</script>");}finally{conn.Close();}}}

第一种方法：

string ConnString = ConfigurationSettings.AppSettings["ConnectionString"]; //创建一个SqlConnection SqlConnection Conn = new SqlConnection( ConnString ); string SQL_Select = "select id, ItemName from DDLItem order by id desc"; //构造一个SqlDataAdapter SqlDataAdapter myAdapter = new SqlDataAdapter( SQL_Select, Conn); //开始读取数据 Conn.Open(); DataSet dataSet = new DataSet(); myAdapter.Fill( dataSet,"Table1" ); Conn.Close(); //开始绑定DropDownList //指定DropDownList使用的数据源 DropDownList1.DataSource = dataSet.Tables["Table1"].DefaultView; //指定DropDownList使用的表里的那些字段 DropDownList1.DataTextField = "ItemName"; //dropdownlist的Text的字段 DropDownList1.DataValueField = "id";//dropdownlist的Value的字段 DropDownList1.DataBind();

第二种方法：

con.Open(); SqlCommand cmd = new SqlCommand(strSql,con); SqlDataReader dr = cmd.ExecuteReader(); while (dr.Read()) { DropDownList1.Items.Add(new ListItem(dr["status"].ToString(), dr["status_Id"].ToString())); }

以上所述是小编给大家介绍的DropDownList控件绑定数据源的三种方法，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！