DropdownList绑定的两种方法

 

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);

         //開始读取数据

         Conn.Open();

         DataSet dataSet = new DataSet();

         myAdapter.Fill( dataSet,"Table1" );

         Conn.Close();

         //開始绑定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();

另外一种方法：        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()));        }

转载于:https://www.cnblogs.com/bhlsheji/p/4391882.html

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