在组合框C＃中我如何可以选择每个时间我单击组合框项目

Question

另一个值它显示的EmpID

名单

我要显示在组合框中EmployeeName但它会得到的EmpID

这里是我的代码

private void EmployeeTimecard_Load(object sender, EventArgs e) 
{ 
    using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["CSPOSWare.Reports.Properties.Settings.chaplinConnectionString"].ConnectionString)) 
    { 
     try 
     { 
      conn.Open(); 
      using (SqlCommand cmd = new SqlCommand("Select (LastName + ', ' + FirstName) AS Employee, EmpID from Employee ", conn)) 
      using (SqlDataReader rdr = cmd.ExecuteReader()) 
      { 
       while (rdr.Read()) 
       { 
        GrpEmpCBox.Items.Add(rdr["EmpID"].ToString()); 
       } 
      } 
     } 
     catch { } 
    } 
    this.FormBorderStyle = FormBorderStyle.FixedSingle; 
    this.GrpEmpCBox.DropDownStyle = ComboBoxStyle.DropDownList; 
    chkAll.Checked = true; 
} 

This is where i get the employee name

This is where i want to get the empID from the Employee table

Answer 1

您正在将值读入您的组合框中;

GrpEmpCBox.Items.Add(rdr["EmpID"].ToString()); 

EmpID应改为你创建Employee字符串。

但是，您可能想要同时读取，显示名称和ID作为值。

Answer 2

使用如下：

while (rdr.Read()) 
{ 
    ListItem comboItem = new ListItem(); 
    comboItem.Text = rdr["Employee"].ToString(); 
    comboItem.Value = rdr["EmpID"].ToString(); 
    GrpEmpCBox.Items.Add(comboItem); 
} 

所以，你可以使用下面的代码从下拉值：

string selectedText = GrpEmpCBox.SelectedItem.ToString(); // which gives you the Employee 
string selectedValue = GrpEmpCBox.SelectedValue;// gives you EmpID 

智能选项绑定使用这样一个DataTable中的组合框：

string query = "Select (LastName + ', ' + FirstName) AS Employee, EmpID from Employee "; 
SqlDataAdapter da = new SqlDataAdapter(query, conn); 
conn.Open(); 
DataTable dt = new DataTable(); 
da.Fill(dt); 
GrpEmpCBox.DisplayMember = "Employee"; 
GrpEmpCBox.ValueMember = "EmpID "; 
GrpEmpCBox.DataSource = dt; 
GrpEmpCBox.DataBind(); 

Answer 3

假设empname是所需的员工姓名

using (SqlDataReader rdr = cmd.ExecuteReader()) 
     { 
      while (rdr.Read()) 
      { 
       GrpEmpCBox.Items.Add(rdr["EmpName"].ToString()); 
      } 
     }