frmMain C# Code
namespace WindowsFormsApplication1
{
public partial class frmMain : Form
{
public frmMain()
{
InitializeComponent();
}
private void frmMain_Load(object sender, EventArgs e)
{
}
private void btnCustSearch_Click(object sender, EventArgs e)
{
ClearControlValue();
frmCustSearch CustSearch = new frmCustSearch();
// 註冊 PassRetValue Event
CustSearch.PassRetValue += CustSearch_PassRetValue;
CustSearch.ShowDialog();
}
private void CustSearch_PassRetValue(object sender, RetValueEventArgs e)
{
var customer = e.Customer;
txtCustID.Text = customer.CustID.ToString();
txtCustName.Text = customer.CustName;
txtAddress.Text = customer.Address;
}
void ClearControlValue()
{
foreach (Control ctl in Controls.OfType<TextBox>())
{
if ((ctl is TextBox txt) == false)
continue;
txt.Text = string.Empty;
}
}
}
}
namespace WindowsFormsApplication1
{
// 宣告 RetValueEventArgs
public class RetValueEventArgs : EventArgs
{
public Customer Customer { get; private set; }
public RetValueEventArgs(Customer customer)
{
Customer = customer;
}
}
// 宣告 RetValueEventHandler delegate
public delegate void RetValueEventHandler(object sender, RetValueEventArgs e);
public partial class frmCustSearch : Form
{
public frmCustSearch()
{
InitializeComponent();
}
// 宣告 PassRetValue event 並透過它回傳
public event RetValueEventHandler PassRetValue;
private void frmCustSearch_Load(object sender, EventArgs e)
{
dgvCustomer.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
btnOK.Click += btn_Click;
btnCancel.Click += btn_Click;
dgvCustomer.DataSource = DataGridViewSource();
dgvCustomer.ClearSelection();
}
List<Customer> DataGridViewSource()
{
return
new List<Customer>()
{
new Customer() { CustID = 1, CustName = "客戶1", Address = "台北" },
new Customer() { CustID = 2, CustName = "客戶2", Address = "台中" },
new Customer() { CustID = 3, CustName = "客戶3", Address = "高雄" }
};
}
void btn_Click(object sender, EventArgs e)
{
Button btn = sender as Button;
if (btn == null)
return;
DialogResult = DialogResult.OK;
if (btn.Name == btnCancel.Name)
{
DialogResult = DialogResult.Cancel;
return;
}
var customer = new Customer()
{
CustID = (int)dgvCustomer.CurrentRow.Cells[ColCustID.Name].Value,
CustName = (string)dgvCustomer.CurrentRow.Cells[ColCustName.Name].Value,
Address = (string)dgvCustomer.CurrentRow.Cells[ColAddress.Name].Value
};
var arg = new RetValueEventArgs(customer);
// 觸發 PassRetValue event
PassRetValue?.Invoke(this, arg);
Close();
}
}
}
