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
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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
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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
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protected void DropDownList1_SelectedindexChanged(object sender,EventArgs e)
{
this.TextBox1.Text = this.DropDownList1.SelectedItem.Text.ToString();
}
第三种：
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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。
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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。
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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：
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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：
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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。编程之家 jb51.cc 收集整理的教程希望能对你有所帮助，如果觉得编程之家不错，可分享给好友！感谢支持。
