[英]Fetch value from database as selected in dropdownlist
我有一個asp 頁面,其中有一個下拉列表。 值的完整列表綁定在數據庫表“a”的下拉列表中。 從該下拉列表中選擇任何值后,我將其保存到數據庫表“b”。 現在,在第二個 asp 頁面中,我希望該下拉列表具有從表“b”中選擇的值。 我的 aspx 頁面:
<asp:DropDownList DataSource='<%# getBankTable() %>' ID="ddlBankName" DataValueField='BANK_ID'
DataTextField="BANK_DESC" SelectedValue='<%# Eval("BANK_ID") %>' AppendDataBoundItems="true"
runat="server">
</asp:DropDownList>
我的.cs頁面:
protected void Page_Load(object sender, EventArgs e)
{
string sql1 = "SELECT * FROM Master LEFT JOIN BANK ON Master.BANK_ID = Transaction.BANK_ID";
OracleDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
ddlBankName.Items.FindByValue(dr["BANK_ID"].ToString()).Selected = true;
}
}
public void getBankTable()
{
ddlBankName.Items.Clear();
ddlBankName.Items.Insert(0, new ListItem("Select", ""));
clsDataAccess cls = new clsDataAccess();
string sql = "SELECT BANK_ID,BANK_DESC FROM Master";
DataTable dt = cls.GetDataTable(sql);
ddlBankName.DataTextField = "BANK_DESC";
ddlBankName.DataValueField = "BANK_ID";
ddlBankName.DataSource = dt;
ddlBankName.DataBind();
}
我無法做到這一點。 請幫忙!!
我個人認為最好在你的 CS 中填充 Dropdown 並在那里設置值。
<asp:DropDownList ID="ddlBankName" DataValueField='BANK_ID' DataTextField="BANK_DESC" AppendDataBoundItems="true" runat="server">
</asp:DropDownList>
在您的 CS 頁面中:
protected void Page_Load(object sender, EventArgs e) {
//Only fill it once on page load:
if (!Page.IsPostBack) {
getBankTable();
string sql1 = "SELECT * FROM Master LEFT JOIN BANK ON Master.BANK_ID = Transaction.BANK_ID";
OracleDataReader dr = cmd.ExecuteReader();
while (dr.Read()) {
if (dr["BANK_ID"] != null)
{
ddlBankName.Items.FindByValue(dr["BANK_ID"].ToString()).Selected = true;
}
}
}
}
public void getBankTable() {
ddlBankName.Items.Clear();
ddlBankName.Items.Insert(0, new ListItem("Select", ""));
clsDataAccess cls = new clsDataAccess();
string sql = "SELECT BANK_ID,BANK_DESC FROM Master";
DataTable dt = cls.GetDataTable(sql);
ddlBankName.DataTextField = "BANK_DESC";
ddlBankName.DataValueField = "BANK_ID";
ddlBankName.DataSource = dt;
ddlBankName.DataBind();
}
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