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コンボボックスに各従業員のフルネームを追加するためにこれを持っています。問題は、EmpID を格納 (非表示) して、comboBox でアイテムを選択すると、選択した従業員の EmpID が textBox に表示されるようにすることです。

public void fillComboBox()
{
    comboBox1.Items.Add("Add Employee");
    using (SqlConnection myDatabaseConnection = new SqlConnection(myConnectionString.ConnectionString))
    {
        myDatabaseConnection.Open();

        using (SqlCommand mySqlCommand = new SqlCommand("Select EmployeeID, LastName, FirstName, MiddleName from Employee", myDatabaseConnection))
        {
            using (SqlDataReader sqlreader = mySqlCommand.ExecuteReader())
            {
                while (sqlreader.Read())
                {
                    string Lname = sqlreader.GetString(sqlreader.GetOrdinal("LastName"));
                    string Fname = sqlreader.GetString(sqlreader.GetOrdinal("FirstName"));
                    string Mname = sqlreader.GetString(sqlreader.GetOrdinal("MiddleName"));
                    string fullName = Lname + ", " + Fname + " " + Mname; 
                    comboBox1.Items.Add(fullName);
                }
            }
        }
    }

    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        //textBox1.Text = SelectedEmpID
        if (comboBox1.Text == "Add Employee")
        {
            EmployeeForm nf = new EmployeeForm();
            DialogResult res = nf.ShowDialog();
            if (res == DialogResult.OK)
            {
                comboBox1.Items.Clear();
                fillComboBox();
            }
        }
    }
4

2 に答える 2

3

このようにしてください

using (SqlConnection con = new SqlConnection(myConnectionString.ConnectionString))
    {
        string query = "Select EmployeeID, (LastName + ','+ FirstName+' '+ MiddleName) as Name from Employee";
        SqlDataAdapter dap = new SqlDataAdapter(query ,con);
        DataTable dt = new DataTable();
        dap.Fill(dt);
         comboBox1.DisplayMember = "Name";
         comboBox1.ValueMember = "EmployeeID";
        DataRow dr = dt.NewRow();
        dr[0] = -1;
        dr[1] = "Add Employee";
        dt.Rows.InsertAt(dr, 0);
        comboBox1.DataSource = dt;

    }

それから

   private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
   {
       if(Convert.ToInt32(comboBox1.SelectedValue.ToString())==-1)
       {
        EmployeeForm nf = new EmployeeForm();
        DialogResult res = nf.ShowDialog();
        if (res == DialogResult.OK)
        {
            comboBox1.Items.Clear();
            fillComboBox();
        }
       }
    }

注:ユーザーがコンボ ボックスで選択した項目を変更した場合にのみ反応するようにする場合は、SelectionChangeCommitted をサブスクライブすることをお勧めします。

于 2013-08-12T12:06:44.740 に答える
0

まず、クラスを作成しますEmployee。たとえば、次のようにします。

public class Employee
{
    public int EmployeeID {get;set;}
    public string LastName { get; set; }
    public string FirstName { get; set; }
    public string MiddleName { get; set; }
    public string FullName { get { return LastName + ", " + FirstName + " " + MiddleName; } }

    public Employee(IDataRecord record)
    {
        this.EmployeeID = Convert.ToInt32(record["EmployeeID"]);
        this.LastName = record["LastName"].ToString();
        this.FirstName = record["FirstName"].ToString();
        this.MiddleName = record["MiddleName"].ToString();
    }
}

そのクラスを使用すると、fillBox()関数は次のようになります。

 public void fillComboBox()
    {
        comboBox1.DisplayMember = "FullName";
        comboBox1.Items.Add("Add employee");
        using (SqlConnection myDatabaseConnection = new SqlConnection(myConnectionString.ConnectionString))
        {
            myDatabaseConnection.Open();

            using (SqlCommand mySqlCommand = new SqlCommand("Select EmployeeID, LastName, FirstName, MiddleName from Employee", myDatabaseConnection))
            {
                using (SqlDataReader sqlreader = mySqlCommand.ExecuteReader())
                {
                    while (sqlreader.Read())
                    {
                        comboBox1.Items.Add(new Employee(sqlreader));
                    }
                }
            }
        }
    }

そしてもちろん SelectedIndexChangedEvent の場合:

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
      {
          var selecetedEmployee = comboBox1.SelectedItem as Employee;
          if (selecetedEmployee == null)
          {
               EmployeeForm nf = new EmployeeForm();
               DialogResult res = nf.ShowDialog();
               if (res == DialogResult.OK)
               {
                   comboBox1.Items.Clear();
                   fillComboBox();
               }
           }
           else
           {
                textBox1.Text = selecetedEmployee.EmployeeID.ToString();
           }
      }
于 2013-08-12T12:54:47.533 に答える