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脚本之家网站的支持！
