DataGridView.Rows Proprietà

Definizione

Ottiene una raccolta contenente tutte le righe nel controllo DataGridView.Gets a collection that contains all the rows in the DataGridView control.

public:
 property System::Windows::Forms::DataGridViewRowCollection ^ Rows { System::Windows::Forms::DataGridViewRowCollection ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Windows.Forms.DataGridViewRowCollection Rows { get; }
[<System.ComponentModel.Browsable(false)>]
member this.Rows : System.Windows.Forms.DataGridViewRowCollection
Public ReadOnly Property Rows As DataGridViewRowCollection

Valore della proprietà

DataGridViewRowCollection

Oggetto DataGridViewRowCollection che contiene tutte le righe in DataGridView.A DataGridViewRowCollection that contains all the rows in the DataGridView.

Attributi

Esempio

Nell'esempio di codice seguente viene illustrato come creare un oggetto DataGridView non associato; impostare le ColumnHeadersVisible ColumnHeadersDefaultCellStyle proprietà, e e ColumnCount utilizzare le Rows Columns proprietà e.The following code example demonstrates how to create an unbound DataGridView; set the ColumnHeadersVisible, ColumnHeadersDefaultCellStyle, and ColumnCount properties; and use the Rows and Columns properties. Viene inoltre illustrato come utilizzare una versione dei AutoResizeColumnHeadersHeight AutoResizeRows metodi e per dimensionare correttamente le intestazioni di colonna e le righe.It also demonstrates how to use a version of the AutoResizeColumnHeadersHeight and AutoResizeRows methods to properly size the column headers and the rows. Per eseguire questo esempio, incollare il codice seguente in un form che contiene un oggetto DataGridView denominato dataGridView1 e un pulsante denominato Button1 , quindi chiamare il InitializeDataGridView metodo dal costruttore del form o dal Load gestore eventi.To run this example, paste the following code into a form that contains a DataGridView named dataGridView1 and a button named Button1, and then call the InitializeDataGridView method from the form's constructor or Load event handler. Verificare che tutti gli eventi siano connessi con i relativi gestori eventi.Ensure all events are connected with their event handlers.

   void InitializeDataGridView()
   {
      this->Size = System::Drawing::Size( 600, 600 );
      dataGridView1->Size = System::Drawing::Size( 450, 400 );

      // Create an unbound DataGridView by declaring a column count.
      dataGridView1->ColumnCount = 4;
      dataGridView1->ColumnHeadersVisible = true;

      // Set the column header style.
      DataGridViewCellStyle ^ columnHeaderStyle = gcnew DataGridViewCellStyle;
      columnHeaderStyle->BackColor = Color::Aqua;
      columnHeaderStyle->Font = gcnew System::Drawing::Font( "Verdana",10,FontStyle::Bold );
      dataGridView1->ColumnHeadersDefaultCellStyle = columnHeaderStyle;

      // Set the column header names.
      dataGridView1->Columns[ 0 ]->Name = "Recipe";
      dataGridView1->Columns[ 1 ]->Name = "Category";
      dataGridView1->Columns[ 2 ]->Name = "Main Ingredients";
      dataGridView1->Columns[ 3 ]->Name = "Rating";

      // Populate the rows.
      array<String^>^row1 = gcnew array<String^>{
         "Meatloaf","Main Dish","ground beef","**"
      };
      array<String^>^row2 = gcnew array<String^>{
         "Key Lime Pie","Dessert","lime juice, evaporated milk","****"
      };
      array<String^>^row3 = gcnew array<String^>{
         "Orange-Salsa Pork Chops","Main Dish","pork chops, salsa, orange juice","****"
      };
      array<String^>^row4 = gcnew array<String^>{
         "Black Bean and Rice Salad","Salad","black beans, brown rice","****"
      };
      array<String^>^row5 = gcnew array<String^>{
         "Chocolate Cheesecake","Dessert","cream cheese","***"
      };
      array<String^>^row6 = gcnew array<String^>{
         "Black Bean Dip","Appetizer","black beans, sour cream","***"
      };
      array<Object^>^rows = {row1,row2,row3,row4,row5,row6};
      System::Collections::IEnumerator^ myEnum = rows->GetEnumerator();
      while ( myEnum->MoveNext() )
      {
         array<String^>^rowArray = safe_cast<array<String^>^>(myEnum->Current);
         dataGridView1->Rows->Add( rowArray );
      }
   }

   void Button1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      // Resize the height of the column headers. 
      dataGridView1->AutoResizeColumnHeadersHeight();

      // Resize all the row heights to fit the contents of all non-header cells.
      dataGridView1->AutoResizeRows(
            DataGridViewAutoSizeRowsMode::AllCellsExceptHeaders);
   }

   void InitializeContextMenu()
   {
      // Create the menu item.
      MenuItem^ getRecipe = gcnew MenuItem( "Search for recipe",gcnew System::EventHandler( this, &Form1::OnMenuClick ) );

      // Add the menu item to the shortcut menu.
      System::Windows::Forms::ContextMenuStrip^ recipeMenu = gcnew System::Windows::Forms::ContextMenuStrip();

      // Set the shortcut menu for the first column.
      dataGridView1->Columns[ 0 ]->ContextMenuStrip = recipeMenu;
   }

   void OnMenuClick( Object^ /*sender*/, System::EventArgs^ /*e*/ )
   {
      if ( dataGridView1->CurrentCell != nullptr )
      {
         //Retrieve the recipe name.
         String^ recipeName = dynamic_cast<String^>(dataGridView1->CurrentCell->Value);

         //Search for the recipe.
         System::Diagnostics::Process::Start( String::Format( "http://search.msn.com/results.aspx?q={0}", recipeName ), nullptr );
      }
   }

private:

private void InitializeDataGridView()
{
    // Create an unbound DataGridView by declaring a column count.
    dataGridView1.ColumnCount = 4;
    dataGridView1.ColumnHeadersVisible = true;

    // Set the column header style.
    DataGridViewCellStyle columnHeaderStyle = new DataGridViewCellStyle();

    columnHeaderStyle.BackColor = Color.Beige;
    columnHeaderStyle.Font = new Font("Verdana", 10, FontStyle.Bold);
    dataGridView1.ColumnHeadersDefaultCellStyle = columnHeaderStyle;

    // Set the column header names.
    dataGridView1.Columns[0].Name = "Recipe";
    dataGridView1.Columns[1].Name = "Category";
    dataGridView1.Columns[2].Name = "Main Ingredients";
    dataGridView1.Columns[3].Name = "Rating";

    // Populate the rows.
    string[] row1 = new string[] { "Meatloaf", "Main Dish", "ground beef",
        "**" };
    string[] row2 = new string[] { "Key Lime Pie", "Dessert", 
        "lime juice, evaporated milk", "****" };
    string[] row3 = new string[] { "Orange-Salsa Pork Chops", "Main Dish", 
        "pork chops, salsa, orange juice", "****" };
    string[] row4 = new string[] { "Black Bean and Rice Salad", "Salad", 
        "black beans, brown rice", "****" };
    string[] row5 = new string[] { "Chocolate Cheesecake", "Dessert", 
        "cream cheese", "***" };
    string[] row6 = new string[] { "Black Bean Dip", "Appetizer", 
        "black beans, sour cream", "***" };
    object[] rows = new object[] { row1, row2, row3, row4, row5, row6 };

    foreach (string[] rowArray in rows)
    {
        dataGridView1.Rows.Add(rowArray);
    }
}

private void button1_Click(object sender, System.EventArgs e)
{
    // Resize the height of the column headers. 
    dataGridView1.AutoResizeColumnHeadersHeight();

    // Resize all the row heights to fit the contents of all non-header cells.
    dataGridView1.AutoResizeRows(
        DataGridViewAutoSizeRowsMode.AllCellsExceptHeaders);
}

private void InitializeContextMenu()
{
    // Create the menu item.
    ToolStripMenuItem getRecipe = new ToolStripMenuItem("Search for recipe", null,
        new System.EventHandler(ShortcutMenuClick));

    // Add the menu item to the shortcut menu.
    ContextMenuStrip recipeMenu = new ContextMenuStrip();
    recipeMenu.Items.Add(getRecipe); 

    // Set the shortcut menu for the first column.
    dataGridView1.Columns[0].ContextMenuStrip = recipeMenu;
    dataGridView1.MouseDown += new MouseEventHandler(dataGridView1_MouseDown);
}

private DataGridViewCell clickedCell;

private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
{
// If the user right-clicks a cell, store it for use by the shortcut menu.
    if (e.Button == MouseButtons.Right)
    {
        DataGridView.HitTestInfo hit = dataGridView1.HitTest(e.X, e.Y);
        if (hit.Type == DataGridViewHitTestType.Cell)
        {
            clickedCell =
                dataGridView1.Rows[hit.RowIndex].Cells[hit.ColumnIndex];
        }
    }
}

private void ShortcutMenuClick(object sender, System.EventArgs e)
{
    if (clickedCell != null)
    {
        //Retrieve the recipe name.
        string recipeName = (string)clickedCell.Value;

        //Search for the recipe.
        System.Diagnostics.Process.Start(
            "http://search.msn.com/results.aspx?q=" + recipeName);
            //null);
    }
}
Private Sub InitializeDataGridView()

    ' Create an unbound DataGridView by declaring a column count.
    dataGridView1.ColumnCount = 4
    dataGridView1.ColumnHeadersVisible = True

    ' Set the column header style.
    Dim columnHeaderStyle As New DataGridViewCellStyle()

    columnHeaderStyle.BackColor = Color.Beige
    columnHeaderStyle.Font = New Font("Verdana", 10, FontStyle.Bold)
    dataGridView1.ColumnHeadersDefaultCellStyle = columnHeaderStyle

    ' Set the column header names.
    dataGridView1.Columns(0).Name = "Recipe"
    dataGridView1.Columns(1).Name = "Category"
    dataGridView1.Columns(2).Name = "Main Ingredients"
    dataGridView1.Columns(3).Name = "Rating"

    ' Populate the rows.
    Dim row1() As String = {"Meatloaf", "Main Dish", "ground beef", "**"}
    Dim row2() As String = _
        {"Key Lime Pie", "Dessert", "lime juice, evaporated milk", "****"}
    Dim row3() As String = {"Orange-Salsa Pork Chops", "Main Dish", _
        "pork chops, salsa, orange juice", "****"}
    Dim row4() As String = {"Black Bean and Rice Salad", "Salad", _
        "black beans, brown rice", "****"}
    Dim row5() As String = _
        {"Chocolate Cheesecake", "Dessert", "cream cheese", "***"}
    Dim row6() As String = _
        {"Black Bean Dip", "Appetizer", "black beans, sour cream", "***"}
    Dim rows() As Object = {row1, row2, row3, row4, row5, row6}

    Dim rowArray As String()
    For Each rowArray In rows
        dataGridView1.Rows.Add(rowArray)
    Next rowArray

End Sub

Private Sub button1_Click(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles button1.Click

    ' Resize the height of the column headers. 
    dataGridView1.AutoResizeColumnHeadersHeight()

    ' Resize all the row heights to fit the contents of all 
    ' non-header cells.
    dataGridView1.AutoResizeRows( _
        DataGridViewAutoSizeRowsMode.AllCellsExceptHeaders)

End Sub

Private Sub InitializeContextMenu()

    ' Create the menu item.
    Dim getRecipe As New ToolStripMenuItem( _
        "Search for recipe", Nothing, AddressOf ShortcutMenuClick)

    ' Add the menu item to the shortcut menu.
    Dim recipeMenu As New ContextMenuStrip()
    recipeMenu.Items.Add(getRecipe)

    ' Set the shortcut menu for the first column.
    dataGridView1.Columns(0).ContextMenuStrip = recipeMenu

End Sub

Private clickedCell As DataGridViewCell

Private Sub dataGridView1_MouseDown(ByVal sender As Object, _
    ByVal e As MouseEventArgs) Handles dataGridView1.MouseDown

    ' If the user right-clicks a cell, store it for use by the 
    ' shortcut menu.
    If e.Button = MouseButtons.Right Then
        Dim hit As DataGridView.HitTestInfo = _
            dataGridView1.HitTest(e.X, e.Y)
        If hit.Type = DataGridViewHitTestType.Cell Then
            clickedCell = _
                dataGridView1.Rows(hit.RowIndex).Cells(hit.ColumnIndex)
        End If
    End If

End Sub

Private Sub ShortcutMenuClick(ByVal sender As Object, _
    ByVal e As System.EventArgs)

    If (clickedCell IsNot Nothing) Then
        'Retrieve the recipe name.
        Dim recipeName As String = CStr(clickedCell.Value)

        'Search for the recipe.
        System.Diagnostics.Process.Start( _
            "http://search.msn.com/results.aspx?q=" + recipeName)
    End If

End Sub

Commenti

È possibile utilizzare la Rows raccolta per popolare manualmente un DataGridView controllo anziché associarlo a un'origine dati.You can use the Rows collection to manually populate a DataGridView control instead of binding it to a data source. Nell'esempio seguente viene illustrato come aggiungere e inserire manualmente righe.The following example shows you how to manually add and insert rows. In questo esempio si presuppone che siano state aggiunte quattro DataGridViewTextBoxColumn istanze alla raccolta del controllo Columns .This example assumes that you have added four DataGridViewTextBoxColumn instances to the control's Columns collection.

Me.dataGridView1.Rows.Add("five", "six", "seven", "eight")  
Me.dataGridView1.Rows.Insert(0, "one", "two", "three", "four")  
this.dataGridView1.Rows.Add("five", "six", "seven", "eight");this.dataGridView1.Rows.Insert(0, "one", "two", "three", "four");  

Per un esempio dettagliato che compila a livello di codice un controllo non associato DataGridView , vedere la sezione relativa agli esempi.For a detailed example that programmatically populates an unbound DataGridView control, see the Example section.

Le righe includono informazioni sullo stile oltre ai valori delle celle.Rows include style information in addition to cell values. Per questo motivo, potrebbe essere necessario aggiungere o inserire righe in base alle righe esistenti di cui è già stato applicato lo stile.For this reason, you might want to add or insert rows based on existing rows that you have already styled. A tale scopo, è possibile usare i AddCopy AddCopies metodi,, InsertCopy e InsertCopies .You can do this using the AddCopy, AddCopies, InsertCopy, and InsertCopies methods.

È anche possibile usare la Rows raccolta per modificare i valori nel controllo o per rimuovere righe.You can also use the Rows collection to modify the values in the control or to remove rows. È possibile modificare i valori o rimuovere le righe indipendentemente dal fatto che il controllo sia associato a un'origine dati esterna.You can modify values or remove rows regardless of whether the control is bound to an external data source. Se è presente un'origine dati, le modifiche vengono apportate direttamente all'origine dati.If there is a data source, the changes are made directly to the data source. Potrebbe tuttavia essere necessario effettuare il push degli aggiornamenti dell'origine dati in un database remoto.You may still need to push the data source updates to a remote database, however. Per altre informazioni, vedere procedura: associare dati al controllo DataGridView Windows Form.For more information, see How to: Bind Data to the Windows Forms DataGridView Control.

Nell'esempio seguente viene illustrato come modificare i valori delle celle a livello di codice.The following example shows you how to modify cell values programmatically.

' Modify the value in the first cell of the second row.  
Me.dataGridView1.Rows[1].Cells[0].Value = "new value"  

' The previous line is equivalent to the following line.  
Me.dataGridView1[0, 1].Value = "new value"  
// Modify the value in the first cell of the second row.  
this.dataGridView1.Rows[1].Cells[0].Value = "new value";  

// The previous line is equivalent to the following line.  
this.dataGridView1[0, 1].Value = "new value";  

Oltre alle funzionalità di raccolta standard, è possibile usare la Rows raccolta per recuperare informazioni sulle righe.In addition to the standard collection capabilities, you can use the Rows collection to retrieve information about rows. Utilizzare il GetRowState metodo per determinare lo stato di una determinata riga.Use the GetRowState method to determine the state of a particular row. Usare i GetRowCount GetRowsHeight metodi e per determinare il numero di righe o l'altezza combinata delle righe in un determinato stato.Use the GetRowCount and GetRowsHeight methods to determine the number of rows or the combined height of rows in a particular state. Per recuperare l'indice di una riga con un determinato stato, usare i GetFirstRow metodi,, GetLastRow GetNextRow e GetPreviousRow .To retrieve the index of a row with a particular state, use the GetFirstRow, GetLastRow, GetNextRow, and GetPreviousRow methods.

Nell'esempio seguente viene illustrato come recuperare l'indice della prima riga selezionata, quindi come utilizzarlo per eliminare la riga a livello di codice.The following example shows you how to retrieve the index of the first selected row, and then use it to programmatically delete the row.

Dim rowToDelete As Int32 = Me.dataGridView1.Rows.GetFirstRow( _  
    DataGridViewElementStates.Selected)  
If rowToDelete > -1 Then  
    Me.dataGridView1.Rows.RemoveAt(rowToDelete)  
End If  
Int32 rowToDelete = this.dataGridView1.Rows.GetFirstRow(  
    DataGridViewElementStates.Selected);  
if (rowToDelete > -1)  
{  
    this.dataGridView1.Rows.RemoveAt(rowToDelete);  
}  

Per migliorare le prestazioni, l'oggetto DataGridViewRowCollection restituito dalla Rows proprietà può includere righe condivise e non condivise.To improve performance, the DataGridViewRowCollection returned by the Rows property can include shared and unshared rows. Le righe condivise condividono la memoria per ridurre il costo di un set di record di grandi dimensioni.Shared rows share memory to reduce the cost of a large record set. Se il set di record è di grandi dimensioni, è necessario prestare attenzione a tenere le righe condivise quanto più possibile quando si accede alla Rows Proprietà.If your record set is very large, you should be careful to keep the rows shared as much as possible when accessing the Rows property.

Per altre informazioni, vedere Procedure consigliate per ridimensionare il controllo DataGridView Windows Form.For more information, see Best Practices for Scaling the Windows Forms DataGridView Control.

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