DropDownList控件绑定数据源的三种方法

  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 list = BLLGeneric.Select(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("alert('" + ex.Message.ToString() + "')");

  }

  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脚本之家网站的支持!

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