如何解决DropdownList数据源
您可以使用来以不同的方式绑定DropDownList List, Dictionary, Enum, DataSet DataTable
。
主要在绑定下拉数据源时您必须考虑三件事。
您可以使用以下代码将下拉列表作为数据绑定到数据源datatable
:
sqlConnection con = new sqlConnection(ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString);
sqlCommand cmd = new sqlCommand("Select * from tblQuiz", con);
sqlDataAdapter da = new sqlDataAdapter(cmd);
DataTable dt=new DataTable();
da.Fill(dt);
DropDownList1.DataTextField = "QUIZ_Name";
DropDownList1.DataValueField = "QUIZ_ID"
DropDownList1.DataSource = dt;
DropDownList1.DataBind();
如果要处理选择下拉列表,则必须进行更改,然后AutopostBack="true"
可以使用SelectedindexChanged
event编写代码。
protected void DropDownList1_SelectedindexChanged(object sender, EventArgs e)
{
string strQUIZ_ID=DropDownList1.SelectedValue;
string strQUIZ_Name=DropDownList1.SelectedItem.Text;
// Your code..............
}
解决方法
大家好,我对下拉列表有疑问。我正在将下拉列表与数据源一起使用。如何获得所选的值?
// I need a if statement here because my programme doesn't know which value of dropdown list selected and I don't know how to use this with datasource.
if(//if I select quiz 1 from dropdown list,quiz 1 should list questions.)
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["RegConnectionString"].ConnectionString);
string chooce = "Select Quiz from tblQuiz where Quiz=1 ";
SqlCommand userExist = new SqlCommand(chooce,con);
con.Open();
int temp = Convert.ToInt32(userExist.ExecuteScalar().ToString());
if (temp == 1)
{
if (rbList.Items[0].Selected == true)
{
string cmdStr = "Select Question from tblQuiz where ID=1";
SqlCommand quest = new SqlCommand(cmdStr,con);
lblque.Text = quest.ExecuteScalar().ToString();
con.Close();
}
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