DataGrid Classe

Definição

public ref class DataGrid : System::Windows::Forms::Control, System::ComponentModel::ISupportInitialize, System::Windows::Forms::IDataGridEditingService

public class DataGrid : System.Windows.Forms.Control, System.ComponentModel.ISupportInitialize, System.Windows.Forms.IDataGridEditingService

[System.ComponentModel.ComplexBindingProperties("DataSource", "DataMember")]
[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDispatch)]
[System.Runtime.InteropServices.ComVisible(true)]
public class DataGrid : System.Windows.Forms.Control, System.ComponentModel.ISupportInitialize, System.Windows.Forms.IDataGridEditingService

type DataGrid = class
    inherit Control
    interface ISupportInitialize
    interface IDataGridEditingService

[<System.ComponentModel.ComplexBindingProperties("DataSource", "DataMember")>]
[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.AutoDispatch)>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type DataGrid = class
    inherit Control
    interface ISupportInitialize
    interface IDataGridEditingService

Public Class DataGrid
Inherits Control
Implements IDataGridEditingService, ISupportInitialize

Herança

Object

MarshalByRefObject

Component

Control

DataGrid

Atributos

ComplexBindingPropertiesAttribute ClassInterfaceAttribute ComVisibleAttribute

Implementações

ISupportInitialize IDataGridEditingService

Exemplos

O seguinte exemplo de código cria uma Windows forma, um DataSet contendo dois objetos DataTable e um DataRelation que relaciona as duas tabelas. Para mostrar os dados, um controlo System.Windows.Forms.DataGrid é então atribuído ao DataSet através do método SetDataBinding. Um botão no formulário altera a aparência da grelha ao criar dois DataGridTableStyle objetos e definir o MappingName de cada objeto como a TableName de um dos DataTable objetos. O exemplo também contém código no MouseUp evento que utiliza o HitTest método para imprimir a coluna, linha e parte da grelha que foi clicada.

#using <system.dll>
#using <system.data.dll>
#using <system.drawing.dll>
#using <system.windows.forms.dll>
#using <system.xml.dll>

using namespace System;
using namespace System::ComponentModel;
using namespace System::Data;
using namespace System::Drawing;
using namespace System::Windows::Forms;

#define null 0
public ref class Form1: public System::Windows::Forms::Form
{
private:
   System::ComponentModel::Container^ components;
   Button^ button1;
   Button^ button2;
   DataGrid^ myDataGrid;
   DataSet^ myDataSet;
   bool TablesAlreadyAdded;

public:
   Form1()
   {
      // Required for Windows Form Designer support.
      InitializeComponent();

      // Call SetUp to bind the controls.
      SetUp();
   }

public:
   ~Form1()
   {
      if ( components != nullptr )
      {
         delete components;
      }
   }

private:
   void InitializeComponent()
   {
      // Create the form and its controls.
      this->components = gcnew System::ComponentModel::Container;
      this->button1 = gcnew System::Windows::Forms::Button;
      this->button2 = gcnew System::Windows::Forms::Button;
      this->myDataGrid = gcnew DataGrid;
      this->Text = "DataGrid Control Sample";
      this->ClientSize = System::Drawing::Size( 450, 330 );
      button1->Location = System::Drawing::Point( 24, 16 );
      button1->Size = System::Drawing::Size( 120, 24 );
      button1->Text = "Change Appearance";
      button1->Click += gcnew System::EventHandler( this, &Form1::button1_Click );
      button2->Location = System::Drawing::Point( 150, 16 );
      button2->Size = System::Drawing::Size( 120, 24 );
      button2->Text = "Get Binding Manager";
      button2->Click += gcnew System::EventHandler( this, &Form1::button2_Click );
      myDataGrid->Location = System::Drawing::Point( 24, 50 );
      myDataGrid->Size = System::Drawing::Size( 300, 200 );
      myDataGrid->CaptionText = "Microsoft DataGrid Control";
      myDataGrid->MouseUp += gcnew MouseEventHandler( this, &Form1::Grid_MouseUp );
      this->Controls->Add( button1 );
      this->Controls->Add( button2 );
      this->Controls->Add( myDataGrid );
   }

   void SetUp()
   {
      // Create a DataSet with two tables and one relation.
      MakeDataSet();

      /* Bind the DataGrid to the DataSet. The dataMember
        specifies that the Customers table should be displayed.*/
      myDataGrid->SetDataBinding( myDataSet, "Customers" );
   }

private:
   void button1_Click( Object^ sender, System::EventArgs^ e )
   {
      if ( TablesAlreadyAdded )
            return;

      AddCustomDataTableStyle();
   }

private:
   void AddCustomDataTableStyle()
   {
      DataGridTableStyle^ ts1 = gcnew DataGridTableStyle;
      ts1->MappingName = "Customers";

      // Set other properties.
      ts1->AlternatingBackColor = Color::LightGray;

      /* Add a GridColumnStyle and set its MappingName 
        to the name of a DataColumn in the DataTable. 
        Set the HeaderText and Width properties. */
      DataGridColumnStyle^ boolCol = gcnew DataGridBoolColumn;
      boolCol->MappingName = "Current";
      boolCol->HeaderText = "IsCurrent Customer";
      boolCol->Width = 150;
      ts1->GridColumnStyles->Add( boolCol );

      // Add a second column style.
      DataGridColumnStyle^ TextCol = gcnew DataGridTextBoxColumn;
      TextCol->MappingName = "custName";
      TextCol->HeaderText = "Customer Name";
      TextCol->Width = 250;
      ts1->GridColumnStyles->Add( TextCol );

      // Create the second table style with columns.
      DataGridTableStyle^ ts2 = gcnew DataGridTableStyle;
      ts2->MappingName = "Orders";

      // Set other properties.
      ts2->AlternatingBackColor = Color::LightBlue;

      // Create new ColumnStyle objects
      DataGridColumnStyle^ cOrderDate = gcnew DataGridTextBoxColumn;
      cOrderDate->MappingName = "OrderDate";
      cOrderDate->HeaderText = "Order Date";
      cOrderDate->Width = 100;
      ts2->GridColumnStyles->Add( cOrderDate );

      /* Use a PropertyDescriptor to create a formatted
        column. First get the PropertyDescriptorCollection
        for the data source and data member. */
      PropertyDescriptorCollection^ pcol = this->BindingContext[myDataSet, "Customers.custToOrders"]->GetItemProperties();

      /* Create a formatted column using a PropertyDescriptor.
        The formatting character "c" specifies a currency format. */
      DataGridColumnStyle^ csOrderAmount = gcnew DataGridTextBoxColumn( pcol[ "OrderAmount" ],"c",true );
      csOrderAmount->MappingName = "OrderAmount";
      csOrderAmount->HeaderText = "Total";
      csOrderAmount->Width = 100;
      ts2->GridColumnStyles->Add( csOrderAmount );

      /* Add the DataGridTableStyle instances to 
        the GridTableStylesCollection. */
      myDataGrid->TableStyles->Add( ts1 );
      myDataGrid->TableStyles->Add( ts2 );

      // Sets the TablesAlreadyAdded to true so this doesn't happen again.
      TablesAlreadyAdded = true;
   }

private:
   void button2_Click( Object^ sender, System::EventArgs^ e )
   {
      BindingManagerBase^ bmGrid;
      bmGrid = BindingContext[myDataSet, "Customers"];
      MessageBox::Show( String::Concat( "Current BindingManager Position: ", bmGrid->Position )->ToString() );
   }

private:
   void Grid_MouseUp( Object^ sender, MouseEventArgs^ e )
   {
      // Create a HitTestInfo object using the HitTest method.
      // Get the DataGrid by casting sender.
      DataGrid^ myGrid = dynamic_cast<DataGrid^>(sender);
      DataGrid::HitTestInfo ^ myHitInfo = myGrid->HitTest( e->X, e->Y );
      Console::WriteLine( myHitInfo );
      Console::WriteLine( myHitInfo->Type );
      Console::WriteLine( myHitInfo->Row );
      Console::WriteLine( myHitInfo->Column );
   }

   // Create a DataSet with two tables and populate it.
   void MakeDataSet()
   {
      // Create a DataSet.
      myDataSet = gcnew DataSet( "myDataSet" );

      // Create two DataTables.
      DataTable^ tCust = gcnew DataTable( "Customers" );
      DataTable^ tOrders = gcnew DataTable( "Orders" );

      // Create two columns, and add them to the first table.
      DataColumn^ cCustID = gcnew DataColumn( "CustID",__int32::typeid );
      DataColumn^ cCustName = gcnew DataColumn( "CustName" );
      DataColumn^ cCurrent = gcnew DataColumn( "Current",bool::typeid );
      tCust->Columns->Add( cCustID );
      tCust->Columns->Add( cCustName );
      tCust->Columns->Add( cCurrent );

      // Create three columns, and add them to the second table.
      DataColumn^ cID = gcnew DataColumn( "CustID",__int32::typeid );
      DataColumn^ cOrderDate = gcnew DataColumn( "orderDate",DateTime::typeid );
      DataColumn^ cOrderAmount = gcnew DataColumn( "OrderAmount",Decimal::typeid );
      tOrders->Columns->Add( cOrderAmount );
      tOrders->Columns->Add( cID );
      tOrders->Columns->Add( cOrderDate );

      // Add the tables to the DataSet.
      myDataSet->Tables->Add( tCust );
      myDataSet->Tables->Add( tOrders );

      // Create a DataRelation, and add it to the DataSet.
      DataRelation^ dr = gcnew DataRelation( "custToOrders",cCustID,cID );
      myDataSet->Relations->Add( dr );

      /* Populate the tables. For each customer and order, 
        create need two DataRow variables. */
      DataRow^ newRow1;
      DataRow^ newRow2;

      // Create three customers in the Customers Table.
      for ( int i = 1; i < 4; i++ )
      {
         newRow1 = tCust->NewRow();
         newRow1[ "custID" ] = i;
         
         // Add the row to the Customers table.
         tCust->Rows->Add( newRow1 );
      }
      tCust->Rows[ 0 ][ "custName" ] = "Customer1";
      tCust->Rows[ 1 ][ "custName" ] = "Customer2";
      tCust->Rows[ 2 ][ "custName" ] = "Customer3";

      // Give the Current column a value.
      tCust->Rows[ 0 ][ "Current" ] = true;
      tCust->Rows[ 1 ][ "Current" ] = true;
      tCust->Rows[ 2 ][ "Current" ] = false;

      // For each customer, create five rows in the Orders table.
      for ( int i = 1; i < 4; i++ )
      {
         for ( int j = 1; j < 6; j++ )
         {
            newRow2 = tOrders->NewRow();
            newRow2[ "CustID" ] = i;
            newRow2[ "orderDate" ] = DateTime(2001,i,j * 2);
            newRow2[ "OrderAmount" ] = i * 10 + j * .1;
            
            // Add the row to the Orders table.
            tOrders->Rows->Add( newRow2 );
         }
      }
   }
};

int main()
{
   Application::Run( gcnew Form1 );
}

using System;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;

public class Form1 : System.Windows.Forms.Form
{
   private System.ComponentModel.Container components;
   private Button button1;
   private Button button2;
   private DataGrid myDataGrid;   
   private DataSet myDataSet;
   private bool TablesAlreadyAdded;
   public Form1()
   {
      // Required for Windows Form Designer support.
      InitializeComponent();
      // Call SetUp to bind the controls.
      SetUp();
   }

   protected override void Dispose( bool disposing ){
      if( disposing ){
         if (components != null){
            components.Dispose();}
      }
      base.Dispose( disposing );
   }
   private void InitializeComponent()
   {
      // Create the form and its controls.
      this.components = new System.ComponentModel.Container();
      this.button1 = new System.Windows.Forms.Button();
      this.button2 = new System.Windows.Forms.Button();
      this.myDataGrid = new DataGrid();
      
      this.Text = "DataGrid Control Sample";
      this.ClientSize = new System.Drawing.Size(450, 330);
      
      button1.Location = new Point(24, 16);
      button1.Size = new System.Drawing.Size(120, 24);
      button1.Text = "Change Appearance";
      button1.Click+=new System.EventHandler(button1_Click);

      button2.Location = new Point(150, 16);
      button2.Size = new System.Drawing.Size(120, 24);
      button2.Text = "Get Binding Manager";
      button2.Click+=new System.EventHandler(button2_Click);

      myDataGrid.Location = new  Point(24, 50);
      myDataGrid.Size = new Size(300, 200);
      myDataGrid.CaptionText = "Microsoft DataGrid Control";
      myDataGrid.MouseUp += new MouseEventHandler(Grid_MouseUp);
      
      this.Controls.Add(button1);
      this.Controls.Add(button2);
      this.Controls.Add(myDataGrid);
   }

   public static void Main()
   {
      Application.Run(new Form1());
   }
   
   private void SetUp()
   {
      // Create a DataSet with two tables and one relation.
      MakeDataSet();
      /* Bind the DataGrid to the DataSet. The dataMember
      specifies that the Customers table should be displayed.*/
      myDataGrid.SetDataBinding(myDataSet, "Customers");
   }

   private void button1_Click(object sender, System.EventArgs e)
   {
      if(TablesAlreadyAdded) return;
      AddCustomDataTableStyle();
   }

   private void AddCustomDataTableStyle()
   {
      DataGridTableStyle ts1 = new DataGridTableStyle();
      ts1.MappingName = "Customers";
      // Set other properties.
      ts1.AlternatingBackColor = Color.LightGray;

      /* Add a GridColumnStyle and set its MappingName 
      to the name of a DataColumn in the DataTable. 
      Set the HeaderText and Width properties. */
      
      DataGridColumnStyle boolCol = new DataGridBoolColumn();
      boolCol.MappingName = "Current";
      boolCol.HeaderText = "IsCurrent Customer";
      boolCol.Width = 150;
      ts1.GridColumnStyles.Add(boolCol);
      
      // Add a second column style.
      DataGridColumnStyle TextCol = new DataGridTextBoxColumn();
      TextCol.MappingName = "custName";
      TextCol.HeaderText = "Customer Name";
      TextCol.Width = 250;
      ts1.GridColumnStyles.Add(TextCol);

      // Create the second table style with columns.
      DataGridTableStyle ts2 = new DataGridTableStyle();
      ts2.MappingName = "Orders";

      // Set other properties.
      ts2.AlternatingBackColor = Color.LightBlue;
      
      // Create new ColumnStyle objects
      DataGridColumnStyle cOrderDate = 
      new DataGridTextBoxColumn();
      cOrderDate.MappingName = "OrderDate";
      cOrderDate.HeaderText = "Order Date";
      cOrderDate.Width = 100;
      ts2.GridColumnStyles.Add(cOrderDate);

      /* Use a PropertyDescriptor to create a formatted
      column. First get the PropertyDescriptorCollection
      for the data source and data member. */
      PropertyDescriptorCollection pcol = this.BindingContext
      [myDataSet, "Customers.custToOrders"].GetItemProperties();
 
      /* Create a formatted column using a PropertyDescriptor.
      The formatting character "c" specifies a currency format. */     
      DataGridColumnStyle csOrderAmount = 
      new DataGridTextBoxColumn(pcol["OrderAmount"], "c", true);
      csOrderAmount.MappingName = "OrderAmount";
      csOrderAmount.HeaderText = "Total";
      csOrderAmount.Width = 100;
      ts2.GridColumnStyles.Add(csOrderAmount);

      /* Add the DataGridTableStyle instances to 
      the GridTableStylesCollection. */
      myDataGrid.TableStyles.Add(ts1);
      myDataGrid.TableStyles.Add(ts2);

     // Sets the TablesAlreadyAdded to true so this doesn't happen again.
     TablesAlreadyAdded=true;
   }

   private void button2_Click(object sender, System.EventArgs e)
   {
      BindingManagerBase bmGrid;
      bmGrid = BindingContext[myDataSet, "Customers"];
      MessageBox.Show("Current BindingManager Position: " + bmGrid.Position);
   }

   private void Grid_MouseUp(object sender, MouseEventArgs e)
   {
      // Create a HitTestInfo object using the HitTest method.

      // Get the DataGrid by casting sender.
      DataGrid myGrid = (DataGrid)sender;
      DataGrid.HitTestInfo myHitInfo = myGrid.HitTest(e.X, e.Y);
      Console.WriteLine(myHitInfo);
      Console.WriteLine(myHitInfo.Type);
      Console.WriteLine(myHitInfo.Row);
      Console.WriteLine(myHitInfo.Column);
   }

   // Create a DataSet with two tables and populate it.
   private void MakeDataSet()
   {
      // Create a DataSet.
      myDataSet = new DataSet("myDataSet");
      
      // Create two DataTables.
      DataTable tCust = new DataTable("Customers");
      DataTable tOrders = new DataTable("Orders");

      // Create two columns, and add them to the first table.
      DataColumn cCustID = new DataColumn("CustID", typeof(int));
      DataColumn cCustName = new DataColumn("CustName");
      DataColumn cCurrent = new DataColumn("Current", typeof(bool));
      tCust.Columns.Add(cCustID);
      tCust.Columns.Add(cCustName);
      tCust.Columns.Add(cCurrent);

      // Create three columns, and add them to the second table.
      DataColumn cID = 
      new DataColumn("CustID", typeof(int));
      DataColumn cOrderDate = 
      new DataColumn("orderDate",typeof(DateTime));
      DataColumn cOrderAmount = 
      new DataColumn("OrderAmount", typeof(decimal));
      tOrders.Columns.Add(cOrderAmount);
      tOrders.Columns.Add(cID);
      tOrders.Columns.Add(cOrderDate);

      // Add the tables to the DataSet.
      myDataSet.Tables.Add(tCust);
      myDataSet.Tables.Add(tOrders);

      // Create a DataRelation, and add it to the DataSet.
      DataRelation dr = new DataRelation
      ("custToOrders", cCustID , cID);
      myDataSet.Relations.Add(dr);
   
      /* Populates the tables. For each customer and order, 
      creates two DataRow variables. */
      DataRow newRow1;
      DataRow newRow2;

      // Create three customers in the Customers Table.
      for(int i = 1; i < 4; i++)
      {
         newRow1 = tCust.NewRow();
         newRow1["custID"] = i;
         // Add the row to the Customers table.
         tCust.Rows.Add(newRow1);
      }
      // Give each customer a distinct name.
      tCust.Rows[0]["custName"] = "Customer1";
      tCust.Rows[1]["custName"] = "Customer2";
      tCust.Rows[2]["custName"] = "Customer3";

      // Give the Current column a value.
      tCust.Rows[0]["Current"] = true;
      tCust.Rows[1]["Current"] = true;
      tCust.Rows[2]["Current"] = false;

      // For each customer, create five rows in the Orders table.
      for(int i = 1; i < 4; i++)
      {
         for(int j = 1; j < 6; j++)
         {
            newRow2 = tOrders.NewRow();
            newRow2["CustID"]= i;
            newRow2["orderDate"]= new DateTime(2001, i, j * 2);
            newRow2["OrderAmount"] = i * 10 + j  * .1;
            // Add the row to the Orders table.
            tOrders.Rows.Add(newRow2);
         }
      }
   }
}

Option Explicit
Option Strict

Imports System.ComponentModel
Imports System.Data
Imports System.Drawing
Imports System.Windows.Forms

Public Class Form1
   Inherits System.Windows.Forms.Form
   Private components As System.ComponentModel.Container
   Private button1 As Button
   Private button2 As Button
   Private myDataGrid As DataGrid
   Private myDataSet As DataSet
   Private TablesAlreadyAdded As Boolean    
    
   Public Sub New()
      ' Required for Windows Form Designer support.
      InitializeComponent()
      ' Call SetUp to bind the controls.
      SetUp()
   End Sub 
        
  Private Sub InitializeComponent()
      ' Create the form and its controls.
      Me.components = New System.ComponentModel.Container()
      Me.button1 = New System.Windows.Forms.Button()
      Me.button2 = New System.Windows.Forms.Button()
      Me.myDataGrid = New DataGrid()
      
      Me.Text = "DataGrid Control Sample"
      Me.ClientSize = New System.Drawing.Size(450, 330)
        
      button1.Location = New Point(24, 16)
      button1.Size = New System.Drawing.Size(120, 24)
      button1.Text = "Change Appearance"
      AddHandler button1.Click, AddressOf button1_Click
        
      button2.Location = New Point(150, 16)
      button2.Size = New System.Drawing.Size(120, 24)
      button2.Text = "Get Binding Manager"
      AddHandler button2.Click, AddressOf button2_Click
        
      myDataGrid.Location = New Point(24, 50)
      myDataGrid.Size = New Size(300, 200)
      myDataGrid.CaptionText = "Microsoft DataGrid Control"
      AddHandler myDataGrid.MouseUp, AddressOf Grid_MouseUp
        
      Me.Controls.Add(button1)
      Me.Controls.Add(button2)
      Me.Controls.Add(myDataGrid)
   End Sub 
    
   Public Shared Sub Main()
      Application.Run(New Form1())
   End Sub 
        
   Private Sub SetUp()
      ' Create a DataSet with two tables and one relation.
      MakeDataSet()
      ' Bind the DataGrid to the DataSet. The dataMember
      ' specifies that the Customers table should be displayed.
      myDataGrid.SetDataBinding(myDataSet, "Customers")
   End Sub 
        
    Private Sub button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        If TablesAlreadyAdded = True Then Exit Sub
        AddCustomDataTableStyle()
    End Sub
   
   Private Sub AddCustomDataTableStyle()
      Dim ts1 As New DataGridTableStyle()
      ts1.MappingName = "Customers"
      ' Set other properties.
      ts1.AlternatingBackColor = Color.LightGray
      ' Add a GridColumnStyle and set its MappingName 
      ' to the name of a DataColumn in the DataTable. 
      ' Set the HeaderText and Width properties. 
        
      Dim boolCol As New DataGridBoolColumn()
      boolCol.MappingName = "Current"
      boolCol.HeaderText = "IsCurrent Customer"
      boolCol.Width = 150
      ts1.GridColumnStyles.Add(boolCol)
        
      ' Add a second column style.
      Dim TextCol As New DataGridTextBoxColumn()
      TextCol.MappingName = "custName"
      TextCol.HeaderText = "Customer Name"
      TextCol.Width = 250
      ts1.GridColumnStyles.Add(TextCol)
        
      ' Create the second table style with columns.
      Dim ts2 As New DataGridTableStyle()
      ts2.MappingName = "Orders"
        
      ' Set other properties.
      ts2.AlternatingBackColor = Color.LightBlue
        
      ' Create new ColumnStyle objects
      Dim cOrderDate As New DataGridTextBoxColumn()
      cOrderDate.MappingName = "OrderDate"
      cOrderDate.HeaderText = "Order Date"
      cOrderDate.Width = 100
      ts2.GridColumnStyles.Add(cOrderDate)

      ' Use a PropertyDescriptor to create a formatted
      ' column. First get the PropertyDescriptorCollection
      ' for the data source and data member. 
      Dim pcol As PropertyDescriptorCollection = _
      Me.BindingContext(myDataSet, "Customers.custToOrders"). _
      GetItemProperties()

      ' Create a formatted column using a PropertyDescriptor.
      ' The formatting character "c" specifies a currency format. */     
        
      Dim csOrderAmount As _
      New DataGridTextBoxColumn(pcol("OrderAmount"), "c", True)
      csOrderAmount.MappingName = "OrderAmount"
      csOrderAmount.HeaderText = "Total"
      csOrderAmount.Width = 100
      ts2.GridColumnStyles.Add(csOrderAmount)
        
      ' Add the DataGridTableStyle instances to 
      ' the GridTableStylesCollection. 
      myDataGrid.TableStyles.Add(ts1)
      myDataGrid.TableStyles.Add(ts2)

     ' Sets the TablesAlreadyAdded to true so this doesn't happen again.
      TablesAlreadyAdded = true
   End Sub 
    
    Private Sub button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim bmGrid As BindingManagerBase
        bmGrid = BindingContext(myDataSet, "Customers")
        MessageBox.Show(("Current BindingManager Position: " & bmGrid.Position))
    End Sub
        
   Private Sub Grid_MouseUp(sender As Object, e As MouseEventArgs)
      ' Create a HitTestInfo object using the HitTest method.
      ' Get the DataGrid by casting sender.
      Dim myGrid As DataGrid = CType(sender, DataGrid)
      Dim myHitInfo As DataGrid.HitTestInfo = myGrid.HitTest(e.X, e.Y)
      Console.WriteLine(myHitInfo)
      Console.WriteLine(myHitInfo.Type)
      Console.WriteLine(myHitInfo.Row)
      Console.WriteLine(myHitInfo.Column)
   End Sub 
        
   ' Create a DataSet with two tables and populate it.
   Private Sub MakeDataSet()
      ' Create a DataSet.
      myDataSet = New DataSet("myDataSet")
       
      ' Create two DataTables.
      Dim tCust As New DataTable("Customers")
      Dim tOrders As New DataTable("Orders")
      
      ' Create two columns, and add them to the first table.
      Dim cCustID As New DataColumn("CustID", GetType(Integer))
      Dim cCustName As New DataColumn("CustName")
      Dim cCurrent As New DataColumn("Current", GetType(Boolean))
      tCust.Columns.Add(cCustID)
      tCust.Columns.Add(cCustName)
      tCust.Columns.Add(cCurrent)
       
      ' Create three columns, and add them to the second table.
      Dim cID As New DataColumn("CustID", GetType(Integer))
      Dim cOrderDate As New DataColumn("orderDate", GetType(DateTime))
      Dim cOrderAmount As New DataColumn("OrderAmount", GetType(Decimal))
      tOrders.Columns.Add(cOrderAmount)
      tOrders.Columns.Add(cID)
      tOrders.Columns.Add(cOrderDate)
       
      ' Add the tables to the DataSet.
      myDataSet.Tables.Add(tCust)
      myDataSet.Tables.Add(tOrders)
        
      ' Create a DataRelation, and add it to the DataSet.
      Dim dr As New DataRelation("custToOrders", cCustID, cID)
      myDataSet.Relations.Add(dr)
        
      ' Populates the tables. For each customer and order, 
      ' creates two DataRow variables. 
      Dim newRow1 As DataRow
      Dim newRow2 As DataRow
        
      ' Create three customers in the Customers Table.
      Dim i As Integer
      For i = 1 To 3
         newRow1 = tCust.NewRow()
         newRow1("custID") = i
         ' Add the row to the Customers table.
         tCust.Rows.Add(newRow1)
      Next i
      ' Give each customer a distinct name.
      tCust.Rows(0)("custName") = "Customer1"
      tCust.Rows(1)("custName") = "Customer2"
      tCust.Rows(2)("custName") = "Customer3"
        
      ' Give the Current column a value.
      tCust.Rows(0)("Current") = True
      tCust.Rows(1)("Current") = True
      tCust.Rows(2)("Current") = False
        
      ' For each customer, create five rows in the Orders table.
      For i = 1 To 3
         Dim j As Integer
         For j = 1 To 5
            newRow2 = tOrders.NewRow()
            newRow2("CustID") = i
            newRow2("orderDate") = New DateTime(2001, i, j * 2)
            newRow2("OrderAmount") = i * 10 + j * 0.1
            ' Add the row to the Orders table.
            tOrders.Rows.Add(newRow2)
         Next j
      Next i
   End Sub 
End Class

Observações

Esta classe não está disponível no .NET Core 3.1 e versões posteriores. Usa o DataGridView controlo em vez disso.

O System.Windows.Forms.DataGrid apresenta ligações semelhantes à Web para tabelas filhas. Pode clicar num link para navegar até à tabela filha. Quando uma tabela filha é exibida, aparece um botão de voltar na legenda que pode ser clicado para voltar à tabela principal. Os dados das linhas principais são exibidos abaixo da legenda e acima dos cabeçalhos das colunas. Pode esconder a informação da linha principal clicando no botão à direita do botão de voltar.

Para mostrar uma tabela no System.Windows.Forms.DataGrid em tempo de execução, use o método SetDataBinding para definir as propriedades DataSource e DataMember para uma fonte de dados válida. As seguintes fontes de dados são válidas:

• Uma DataTable

• Uma DataView

• Uma DataSet

• Uma DataViewManager

• Um array de dimensão única

• Qualquer componente que implemente a IListSource interface

• Qualquer componente que implemente a IList interface

Para mais informações sobre a DataSet aula, consulte DataSets, DataTables e DataViews.

Pode criar uma grelha que permita aos utilizadores editar dados, mas que os impeça de adicionar novas linhas, usando a DataView como fonte de dados e definindo a AllowNew propriedade para false.

As fontes de dados são ainda geridas por BindingManagerBase objetos. Para cada tabela numa fonte de dados, um BindingManagerBase pode ser devolvido a partir da forma BindingContext. Por exemplo, pode determinar o número de linhas contidas por uma fonte de dados ao devolver a propriedade do Count objeto associadoBindingManagerBase.

Para validar dados, use os objetos subjacentes que representam os dados e os seus eventos. Por exemplo, se os dados vierem de a DataTable num DataSet, use os ColumnChanging eventos e RowChanging .

Para determinar qual célula é selecionada, use a CurrentCell propriedade. Altere o valor de qualquer célula usando a Item[] propriedade , que pode tomar tanto os índices de linha e coluna da célula, como um único DataGridCell. Monitorize o CurrentCellChanged evento para detetar quando o utilizador seleciona outra célula.

Para determinar em que parte do controlo o utilizador clicou, use o HitTest método no MouseDown evento. O HitTest método devolve um DataGrid.HitTestInfo objeto, que contém a linha e a coluna de uma área clicada.

Para gerir a aparência do controlo em tempo de execução, estão disponíveis várias propriedades para definir os atributos de cor e legenda, incluindo , CaptionForeColorCaptionBackColor, CaptionFont, e assim sucessivamente.

A aparência da grelha (ou grelhas) exibidas pode ser ainda mais modificada criando DataGridTableStyle objetos e adicionando-os à GridTableStylesCollection, que é acedida através da TableStyles propriedade. Por exemplo, se o DataSource estiver definido para contendo três DataTable objetosDataSet, pode adicionar três DataGridTableStyle objetos à coleção, um para cada tabela. Para sincronizar cada DataGridTableStyle objeto com um DataTable, defina o MappingName do DataGridTableStyle para o TableName do DataTable. Para mais informações sobre ligação a um array de objetos, consulte a DataGridTableStyle.MappingName propriedade.

Para criar uma vista personalizada de uma tabela, crie uma instância de uma DataGridTextBoxColumn classe ou DataGridBoolColumn e adicione o objeto ao GridTableStylesCollection acedido através da TableStyles propriedade. Ambas as classes herdam de DataGridColumnStyle. Para cada estilo de coluna, define o MappingName para ColumnName de uma coluna que queres mostrar na grelha. Para ocultar uma coluna, define-a MappingName para algo diferente de um válido ColumnName.

Para formatar o texto de uma coluna, defina a Format propriedade do DataGridTextBoxColumn para um dos valores encontrados em Tipos de Formatação e Cadeias de Formatação Personalizadas de Data e Hora.

Para associar o DataGrid a um array fortemente tipado de objetos, o tipo de objeto deve conter propriedades públicas. Para criar um DataGridTableStyle que mostre o array, defina a DataGridTableStyle.MappingName propriedade para typename[] onde typename é substituída pelo nome do tipo de objeto. Note também que a MappingName propriedade é distinta a maiúsculas e minúsculas; o nome do tipo deve ser correspondido exatamente. Veja a MappingName propriedade para um exemplo.

Também pode associar o DataGrid a um ArrayList. Uma característica do ArrayList é que pode conter objetos de vários tipos, mas DataGrid só pode ser ligado a tal lista quando todos os itens da lista forem do mesmo tipo que o primeiro. Isto significa que todos os objetos devem ser do mesmo tipo, ou devem herdar da mesma classe que o primeiro item da lista. Por exemplo, se o primeiro item numa lista for um Control, o segundo item pode ser um TextBox (que herda de Control). Se, por outro lado, o primeiro item for um TextBox, o segundo objeto não pode ser um Control. Além disso, deve ArrayList ter itens quando está encadernado. Um vazio ArrayList resultará numa grelha vazia. Além disso, os objetos no ArrayList devem conter propriedades públicas. Ao ligar a um ArrayList, defina o MappingName de para DataGridTableStyle "ArrayList" (o nome do tipo).

Para cada DataGridTableStyle, podes definir atributos de cor e legenda que sobrepõem as definições do controlo System.Windows.Forms.DataGrid. No entanto, se essas propriedades não estiverem definidas, as definições do controlo são usadas por defeito. As seguintes propriedades podem ser sobrepostas por DataGridTableStyle propriedades:

• AllowSorting

• AlternatingBackColor

• BackColor

• ColumnHeadersVisible

• ForeColor

• GridLineColor

• GridLineStyle

• HeaderBackColor

• HeaderFont

• HeaderForeColor

• LinkColor

• PreferredColumnWidth

• PreferredRowHeight

• ReadOnly

• RowHeadersVisible

• RowHeaderWidth

• SelectionBackColor

• SelectionForeColor

Para personalizar a aparência de colunas individuais, adicione DataGridColumnStyle objetos ao GridColumnStylesCollection, que é acedido através da GridColumnStyles propriedade de cada DataGridTableStyle. Para sincronizar cada um DataGridColumnStyle com a DataColumn no DataTable, defina o MappingName para o ColumnName de um DataColumn. Ao construir um DataGridColumnStyle, também pode definir uma cadeia de formatação que especifique como a coluna exibe os dados. Por exemplo, pode especificar que a coluna utilize um formato de data curta para mostrar as datas contidas na tabela.

Ver também

• DataSet
• DataView
• DataTable
• DataRow
• ADO.NET