Instrukcje: tworzenie formularza wzorzec/szczegół za pomocą dwóch kontrolek DataGridView formularzy systemu Windows
Poniższy przykład kodu tworzy formularz wzorzec/szczegół przy użyciu dwóch kontrolek DataGridView powiązanych z dwoma składnikami BindingSource . Źródło danych to tabela DataSetCustomers zawierająca tabele i Orders z przykładowej bazy danych Northwind SQL Server DataRelation z elementem , który wiąże te dwie tabele za pośrednictwem kolumny CustomerID .
Jedna BindingSource jest powiązana z tabelą nadrzędną Customers w zestawie danych. Te dane są wyświetlane w kontrolce głównej DataGridView . Drugi jest BindingSource powiązany z pierwszym łącznikiem danych. Właściwość DataMember sekundy BindingSource jest ustawiona na nazwę DataRelation . Powoduje to, że skojarzona DataGridView kontrolka szczegółów wyświetla wiersze Orders tabeli podrzędnej, które odpowiadają bieżącemu wierszowi w kontrolce głównej DataGridView .
Aby uzyskać pełne wyjaśnienie tego przykładu kodu, zobacz Przewodnik: tworzenie formularza wzorzec/szczegół przy użyciu dwóch Windows Forms DataGridView.
Przykład
using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;
public class Form1 : System.Windows.Forms.Form
{
private DataGridView masterDataGridView = new DataGridView();
private BindingSource masterBindingSource = new BindingSource();
private DataGridView detailsDataGridView = new DataGridView();
private BindingSource detailsBindingSource = new BindingSource();
[STAThreadAttribute()]
public static void Main()
{
Application.Run(new Form1());
}
// Initializes the form.
public Form1()
{
masterDataGridView.Dock = DockStyle.Fill;
detailsDataGridView.Dock = DockStyle.Fill;
SplitContainer splitContainer1 = new SplitContainer();
splitContainer1.Dock = DockStyle.Fill;
splitContainer1.Orientation = Orientation.Horizontal;
splitContainer1.Panel1.Controls.Add(masterDataGridView);
splitContainer1.Panel2.Controls.Add(detailsDataGridView);
this.Controls.Add(splitContainer1);
this.Load += new System.EventHandler(Form1_Load);
this.Text = "DataGridView master/detail demo";
}
private void Form1_Load(object sender, System.EventArgs e)
{
// Bind the DataGridView controls to the BindingSource
// components and load the data from the database.
masterDataGridView.DataSource = masterBindingSource;
detailsDataGridView.DataSource = detailsBindingSource;
GetData();
// Resize the master DataGridView columns to fit the newly loaded data.
masterDataGridView.AutoResizeColumns();
// Configure the details DataGridView so that its columns automatically
// adjust their widths when the data changes.
detailsDataGridView.AutoSizeColumnsMode =
DataGridViewAutoSizeColumnsMode.AllCells;
}
private void GetData()
{
try
{
// Specify a connection string. Replace the given value with a
// valid connection string for a Northwind SQL Server sample
// database accessible to your system.
String connectionString =
"Integrated Security=SSPI;Persist Security Info=False;" +
"Initial Catalog=Northwind;Data Source=localhost";
SqlConnection connection = new SqlConnection(connectionString);
// Create a DataSet.
DataSet data = new DataSet();
data.Locale = System.Globalization.CultureInfo.InvariantCulture;
// Add data from the Customers table to the DataSet.
SqlDataAdapter masterDataAdapter = new
SqlDataAdapter("select * from Customers", connection);
masterDataAdapter.Fill(data, "Customers");
// Add data from the Orders table to the DataSet.
SqlDataAdapter detailsDataAdapter = new
SqlDataAdapter("select * from Orders", connection);
detailsDataAdapter.Fill(data, "Orders");
// Establish a relationship between the two tables.
DataRelation relation = new DataRelation("CustomersOrders",
data.Tables["Customers"].Columns["CustomerID"],
data.Tables["Orders"].Columns["CustomerID"]);
data.Relations.Add(relation);
// Bind the master data connector to the Customers table.
masterBindingSource.DataSource = data;
masterBindingSource.DataMember = "Customers";
// Bind the details data connector to the master data connector,
// using the DataRelation name to filter the information in the
// details table based on the current row in the master table.
detailsBindingSource.DataSource = masterBindingSource;
detailsBindingSource.DataMember = "CustomersOrders";
}
catch (SqlException)
{
MessageBox.Show("To run this example, replace the value of the " +
"connectionString variable with a connection string that is " +
"valid for your system.");
}
}
}
Imports System.Data
Imports System.Data.SqlClient
Imports System.Windows.Forms
Public Class Form1
Inherits System.Windows.Forms.Form
Private masterDataGridView As New DataGridView()
Private masterBindingSource As New BindingSource()
Private detailsDataGridView As New DataGridView()
Private detailsBindingSource As New BindingSource()
<STAThreadAttribute()> _
Public Shared Sub Main()
Application.Run(New Form1())
End Sub
' Initializes the form.
Public Sub New()
masterDataGridView.Dock = DockStyle.Fill
detailsDataGridView.Dock = DockStyle.Fill
Dim splitContainer1 As New SplitContainer()
splitContainer1.Dock = DockStyle.Fill
splitContainer1.Orientation = Orientation.Horizontal
splitContainer1.Panel1.Controls.Add(masterDataGridView)
splitContainer1.Panel2.Controls.Add(detailsDataGridView)
Me.Controls.Add(splitContainer1)
Me.Text = "DataGridView master/detail demo"
End Sub
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles Me.Load
' Bind the DataGridView controls to the BindingSource
' components and load the data from the database.
masterDataGridView.DataSource = masterBindingSource
detailsDataGridView.DataSource = detailsBindingSource
GetData()
' Resize the master DataGridView columns to fit the newly loaded data.
masterDataGridView.AutoResizeColumns()
' Configure the details DataGridView so that its columns automatically
' adjust their widths when the data changes.
detailsDataGridView.AutoSizeColumnsMode = _
DataGridViewAutoSizeColumnsMode.AllCells
End Sub
Private Sub GetData()
Try
' Specify a connection string. Replace the given value with a
' valid connection string for a Northwind SQL Server sample
' database accessible to your system.
Dim connectionString As String = _
"Integrated Security=SSPI;Persist Security Info=False;" & _
"Initial Catalog=Northwind;Data Source=localhost"
Dim connection As New SqlConnection(connectionString)
' Create a DataSet.
Dim data As New DataSet()
data.Locale = System.Globalization.CultureInfo.InvariantCulture
' Add data from the Customers table to the DataSet.
Dim masterDataAdapter As _
New SqlDataAdapter("select * from Customers", connection)
masterDataAdapter.Fill(data, "Customers")
' Add data from the Orders table to the DataSet.
Dim detailsDataAdapter As _
New SqlDataAdapter("select * from Orders", connection)
detailsDataAdapter.Fill(data, "Orders")
' Establish a relationship between the two tables.
Dim relation As New DataRelation("CustomersOrders", _
data.Tables("Customers").Columns("CustomerID"), _
data.Tables("Orders").Columns("CustomerID"))
data.Relations.Add(relation)
' Bind the master data connector to the Customers table.
masterBindingSource.DataSource = data
masterBindingSource.DataMember = "Customers"
' Bind the details data connector to the master data connector,
' using the DataRelation name to filter the information in the
' details table based on the current row in the master table.
detailsBindingSource.DataSource = masterBindingSource
detailsBindingSource.DataMember = "CustomersOrders"
Catch ex As SqlException
MessageBox.Show("To run this example, replace the value of the " & _
"connectionString variable with a connection string that is " & _
"valid for your system.")
End Try
End Sub
End Class
Kompilowanie kodu
Ten przykład wymaga:
Odwołania do System, System.Data, System. Windows. Formularze i System.XML zestawów.
Zabezpieczenia.NET Framework
Przechowywanie poufnych informacji, takich jak hasło, w ramach parametrów połączenia może mieć wpływ na bezpieczeństwo aplikacji. Korzystanie z uwierzytelniania systemu Windows (znanego również jako zabezpieczenia zintegrowane) jest bezpieczniejszym sposobem na kontrolowanie dostępu do bazy danych. Aby uzyskać więcej informacji, zobacz Ochrona informacji o połączeniu.