Question

我有一个下拉列表，其值从数据库中检索。我正在从数据库中检索ID和名称。

new Handler().post(new Runnable() {
            @Override
            public void run() {
                staggeredGridLayoutManager.scrollToPositionWithOffset(mImageList.size() - 1, 0);
            }
        });

我必须在文本框中显示每个部门的员工人数。假设用户选择人类部门，则文本框应显示该部门中的员工数量。

对于ListBox，只能检索数据库中的两个值。如何显示这种情况下的员工人数？

public void GetDepartment_temp()
        {
            try
            {
                DataTable dt = new DataTable();
                listBoxDepartment.ClearSelection();
                Get_Department objDAL = new Get_Department();
                dt = objDAL.Get_Hospital_Department();
                if (dt != null && dt.Rows.Count > 0)
                {
                    foreach (DataRow row in dt.Rows)
                    {
                        listBoxDepartment.Items.Add(new ListItem(row["department_name"].ToString(), row["department_id"].ToString()));

                    }
                }
            }
            catch (Exception) { }
        }

Answer 1

声明For the ListBox, only two values from the database can be retrieved.不正确。您可以使用任意多个字段填充数据表。但是，您可以像以前一样仅设置“列表框”项的“值”和“文本”属性。

更改存储过程代码以获取员工数。
将您的数据表dt标记为static and public。

获取数据，您可以根据需要播放数据。您可以在listview上的文本框中获取员工计数，所选索引已更改，如下所示：

public static DataTable dt = new DataTable();

public void GetDepartment_temp()
{
    try
    {


        string connString = ConfigurationManager.ConnectionStrings["SOConnectionString"].ConnectionString;
        SqlConnection connection = new SqlConnection(connString);

        SqlCommand command =
            new SqlCommand(
                "select  Department.DepartmentID, Department.[Department Name], count( Department.DepartmentID) as empCount from Department join Employee on Department.DepartmentID = Employee.DepartmentID group by Department.DepartmentID, Department.[Department Name]",
                connection);

        command.Connection.Open();

        SqlDataAdapter da = new SqlDataAdapter(command);
        da.Fill(dt);
        dt.PrimaryKey = new DataColumn[] {dt.Columns["DepartmentID"]};
        ListBox1.ClearSelection();
        if (dt != null && dt.Rows.Count > 0)
        {
            foreach (DataRow row in dt.Rows)
            {
                ListBox1.Items.Add(new ListItem(row["Department Name"].ToString(),
                    row["DepartmentID"].ToString()));

            }
        }
    }
    catch (Exception ex)
    {
    }
}

protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{

    DataRow dr = dt.Rows.Find(Convert.ToInt32(ListBox1.SelectedItem.Value));
    TextBox5.Text = dr["empCount"].ToString();

}

从asp下拉列表中的多个列中检索值

1 个答案: