DataGridViewRowContextMenuStripNeededEventArgs Classe
Definizione
Importante
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Fornisce i dati per l'evento RowContextMenuStripNeeded.
public ref class DataGridViewRowContextMenuStripNeededEventArgs : EventArgspublic class DataGridViewRowContextMenuStripNeededEventArgs : EventArgstype DataGridViewRowContextMenuStripNeededEventArgs = class
inherit EventArgsPublic Class DataGridViewRowContextMenuStripNeededEventArgs
Inherits EventArgs- Ereditarietà
Esempio
Nell'esempio di codice seguente viene gestito l'evento RowContextMenuStripNeeded per fornire un oggetto ContextMenuStrip basato sul titolo del dipendente. In questo esempio sono disponibili due menu di scelta rapida, uno per i responsabili e uno per tutti gli altri dipendenti.
#region Using directives
using System;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Windows.Forms;
#endregion
class Form1 : Form
{
private DataGridView dataGridView1 = new DataGridView();
private ContextMenuStrip employeeMenuStrip = new ContextMenuStrip();
private ContextMenuStrip managerMenuStrip = new ContextMenuStrip();
private ToolStripMenuItem toolStripMenuItem1 = new ToolStripMenuItem();
private ToolStripMenuItem toolStripMenuItem2 = new ToolStripMenuItem();
private ToolStripMenuItem toolStripMenuItem3 = new ToolStripMenuItem();
private int contextMenuRowIndex;
public Form1()
{
// Initialize the form.
// This code can be replaced with designer generated code.
this.Size = new Size(700, 300);
this.Controls.Add(dataGridView1);
toolStripMenuItem1.Text = "View Employee Sales Report";
toolStripMenuItem2.Text = "View Team Sales Report";
toolStripMenuItem3.Text = "View Company Sales Team Ranking Report";
}
protected override void OnLoad(EventArgs e)
{
dataGridView1.DataBindingComplete +=
new DataGridViewBindingCompleteEventHandler(
dataGridView1_DataBindingComplete);
dataGridView1.CellToolTipTextNeeded +=
new DataGridViewCellToolTipTextNeededEventHandler(
dataGridView1_CellToolTipTextNeeded);
dataGridView1.RowContextMenuStripNeeded +=
new DataGridViewRowContextMenuStripNeededEventHandler(
dataGridView1_RowContextMenuStripNeeded);
toolStripMenuItem1.Click +=
new EventHandler(toolStripMenuItem1_Click);
toolStripMenuItem2.Click +=
new EventHandler(toolStripMenuItem2_Click);
toolStripMenuItem3.Click +=
new EventHandler(toolStripMenuItem3_Click);
employeeMenuStrip.Items.Add(toolStripMenuItem1);
managerMenuStrip.Items.Add(toolStripMenuItem2);
managerMenuStrip.Items.Add(toolStripMenuItem3);
PopulateDataGridView();
base.OnLoad(e);
}
// Establish the main entry point for the application.
[STAThreadAttribute()]
public static void Main()
{
Application.Run(new Form1());
}
// Replace this with your own code to populate the DataGridView.
private void PopulateDataGridView()
{
dataGridView1.Dock = DockStyle.Fill;
dataGridView1.AllowUserToAddRows = false;
dataGridView1.MultiSelect = false;
dataGridView1.ReadOnly = true;
dataGridView1.AllowUserToDeleteRows = false;
string query;
query = "SELECT e1.*, e2.FirstName + ' ' + e2.LastName AS Manager "
+ "FROM employees AS e1 LEFT JOIN employees AS e2 "
+ "ON e1.ReportsTo = e2.EmployeeID";
// Connect to the database
SqlConnection sqlConnection1 = new SqlConnection(
"Integrated Security=SSPI;Persist Security Info=False;" +
"Initial Catalog=Northwind;Data Source=localhost");
SqlDataAdapter sqlDataAdapter1 = new SqlDataAdapter(query,
sqlConnection1);
DataTable dataTable1 = new DataTable();
dataTable1.Locale = System.Globalization.CultureInfo.InvariantCulture;
sqlDataAdapter1.Fill(dataTable1);
dataGridView1.DataSource = dataTable1;
}
private void dataGridView1_DataBindingComplete(object sender,
DataGridViewBindingCompleteEventArgs e)
{
// Hide some of the columns.
dataGridView1.Columns["EmployeeID"].Visible = false;
dataGridView1.Columns["Address"].Visible = false;
dataGridView1.Columns["TitleOfCourtesy"].Visible = false;
dataGridView1.Columns["BirthDate"].Visible = false;
dataGridView1.Columns["HireDate"].Visible = false;
dataGridView1.Columns["PostalCode"].Visible = false;
dataGridView1.Columns["Photo"].Visible = false;
dataGridView1.Columns["Notes"].Visible = false;
dataGridView1.Columns["ReportsTo"].Visible = false;
dataGridView1.Columns["PhotoPath"].Visible = false;
// Disable sorting for the DataGridView.
foreach (DataGridViewColumn i in
dataGridView1.Columns)
{
i.SortMode = DataGridViewColumnSortMode.NotSortable;
}
dataGridView1.AutoResizeColumns();
}
void dataGridView1_RowContextMenuStripNeeded(object sender,
DataGridViewRowContextMenuStripNeededEventArgs e)
{
DataGridViewRow dataGridViewRow1 = dataGridView1.Rows[e.RowIndex];
toolStripMenuItem1.Enabled = true;
// Show the appropriate ContextMenuStrip based on the employees title.
if ((dataGridViewRow1.Cells["Title"].Value.ToString() ==
"Sales Manager") ||
(dataGridViewRow1.Cells["Title"].Value.ToString() ==
"Vice President, Sales"))
{
e.ContextMenuStrip = managerMenuStrip;
}
else
{
e.ContextMenuStrip = employeeMenuStrip;
}
contextMenuRowIndex = e.RowIndex;
}
void dataGridView1_CellToolTipTextNeeded(object sender,
DataGridViewCellToolTipTextNeededEventArgs e)
{
string newLine = Environment.NewLine;
if (e.RowIndex > -1)
{
DataGridViewRow dataGridViewRow1 = dataGridView1.Rows[e.RowIndex];
// Add the employee's ID to the ToolTipText.
e.ToolTipText = String.Format("EmployeeID {0}:{1}",
dataGridViewRow1.Cells["EmployeeID"].Value, newLine);
// Add the employee's name to the ToolTipText.
e.ToolTipText += String.Format("{0} {1} {2}{3}",
dataGridViewRow1.Cells["TitleOfCourtesy"].Value.ToString(),
dataGridViewRow1.Cells["FirstName"].Value.ToString(),
dataGridViewRow1.Cells["LastName"].Value.ToString(),
newLine);
// Add the employee's title to the ToolTipText.
e.ToolTipText += String.Format("{0}{1}{2}",
dataGridViewRow1.Cells["Title"].Value.ToString(),
newLine, newLine);
// Add the employee's contact information to the ToolTipText.
e.ToolTipText += String.Format("{0}{1}{2}, ",
dataGridViewRow1.Cells["Address"].Value.ToString(), newLine,
dataGridViewRow1.Cells["City"].Value.ToString());
if (!String.IsNullOrEmpty(
dataGridViewRow1.Cells["Region"].Value.ToString()))
{
e.ToolTipText += String.Format("{0}, ",
dataGridViewRow1.Cells["Region"].Value.ToString());
}
e.ToolTipText += String.Format("{0}, {1}{2}{3} EXT:{4}{5}{6}",
dataGridViewRow1.Cells["Country"].Value.ToString(),
dataGridViewRow1.Cells["PostalCode"].Value.ToString(),
newLine, dataGridViewRow1.Cells["HomePhone"].Value.ToString(),
dataGridViewRow1.Cells["Extension"].Value.ToString(),
newLine, newLine);
// Add employee information to the ToolTipText.
DateTime HireDate =
(DateTime)dataGridViewRow1.Cells["HireDate"].Value;
e.ToolTipText +=
String.Format("Employee since: {0}/{1}/{2}{3}Manager: {4}",
HireDate.Month.ToString(), HireDate.Day.ToString(),
HireDate.Year.ToString(), newLine,
dataGridViewRow1.Cells["Manager"].Value.ToString());
}
}
void toolStripMenuItem1_Click(object sender, EventArgs e)
{
DataGridViewRow dataGridViewRow1 =
dataGridView1.Rows[contextMenuRowIndex];
MessageBox.Show(String.Format(
"Sales Report for {0} {1}{2}{3}Reporting not implemented.",
dataGridViewRow1.Cells["FirstName"].Value.ToString(),
dataGridViewRow1.Cells["LastName"].Value.ToString(),
Environment.NewLine, Environment.NewLine));
}
void toolStripMenuItem2_Click(object sender, EventArgs e)
{
DataGridViewRow dataGridViewRow1 =
dataGridView1.Rows[contextMenuRowIndex];
MessageBox.Show(String.Format(
"Sales Report for {0} {1}'s Team{2}{3}Reporting not implemented.",
dataGridViewRow1.Cells["FirstName"].Value.ToString(),
dataGridViewRow1.Cells["LastName"].Value.ToString(),
Environment.NewLine, Environment.NewLine));
}
void toolStripMenuItem3_Click(object sender, EventArgs e)
{
DataGridViewRow dataGridViewRow1 =
dataGridView1.Rows[contextMenuRowIndex];
MessageBox.Show(String.Format(
"Company Sales Ranking Report:{0}{1}Reporting not implemented.",
Environment.NewLine, Environment.NewLine));
}
}
Imports System.Data
Imports System.Data.SqlClient
Imports System.Drawing
Imports System.Windows.Forms
Class Form1
Inherits Form
Private WithEvents dataGridView1 As New DataGridView()
Private WithEvents employeeMenuStrip As New ContextMenuStrip()
Private WithEvents managerMenuStrip As New ContextMenuStrip()
Private WithEvents toolStripMenuItem1 As New ToolStripMenuItem()
Private WithEvents toolStripMenuItem2 As New ToolStripMenuItem()
Private WithEvents toolStripMenuItem3 As New ToolStripMenuItem()
Private contextMenuRowIndex As Integer
Public Sub New()
Me.Size = New Size(700, 300)
Me.Controls.Add(dataGridView1)
toolStripMenuItem1.Text = "View Employee Sales Report"
toolStripMenuItem2.Text = "View Team Sales Report"
toolStripMenuItem3.Text = "View Company Sales Team Ranking Report"
With employeeMenuStrip
.Items.Add(toolStripMenuItem1)
End With
With managerMenuStrip
.Items.Add(toolStripMenuItem2)
.Items.Add(toolStripMenuItem3)
End With
PopulateDataGridView()
End Sub
' Establish the main entry point for the application.
<STAThreadAttribute()> _
Public Shared Sub Main()
Application.Run(New Form1())
End Sub
Private Sub PopulateDataGridView()
With dataGridView1
.Dock = DockStyle.Fill
.AllowUserToAddRows = False
.MultiSelect = False
.ReadOnly = True
.AllowUserToDeleteRows = False
End With
Dim query As String
query = "SELECT e1.*, e2.FirstName + ' ' + e2.LastName AS Manager "
query &= "FROM employees AS e1 LEFT JOIN employees AS e2 "
query &= "ON e1.ReportsTo = e2.EmployeeID"
' Connect to the database
Dim sqlConnection1 As New SqlConnection( _
"Integrated Security=SSPI;Persist Security Info=False;" & _
"Initial Catalog=Northwind;Data Source=localhost")
Dim sqlDataAdapter1 As New SqlDataAdapter(query, _
sqlConnection1)
Dim dataTable1 As New System.Data.DataTable()
dataTable1.Locale = System.Globalization.CultureInfo.InvariantCulture
sqlDataAdapter1.Fill(dataTable1)
dataGridView1.DataSource = dataTable1
End Sub
Private Sub dataGridView1_DataBindingComplete(ByVal sender As Object, _
ByVal e As DataGridViewBindingCompleteEventArgs) _
Handles dataGridView1.DataBindingComplete
' Hide some of the columns.
With dataGridView1
.Columns("EmployeeID").Visible = False
.Columns("Address").Visible = False
.Columns("TitleOfCourtesy").Visible = False
.Columns("BirthDate").Visible = False
.Columns("HireDate").Visible = False
.Columns("PostalCode").Visible = False
.Columns("Photo").Visible = False
.Columns("Notes").Visible = False
.Columns("ReportsTo").Visible = False
.Columns("PhotoPath").Visible = False
End With
' Disable sorting for the DataGridView.
Dim i As DataGridViewColumn
For Each i In dataGridView1.Columns
i.SortMode = DataGridViewColumnSortMode.NotSortable
Next i
dataGridView1.AutoResizeColumns()
End Sub
Public Sub dataGridView1_RowContextMenuStripNeeded( _
ByVal sender As Object, _
ByVal e As DataGridViewRowContextMenuStripNeededEventArgs) _
Handles dataGridView1.RowContextMenuStripNeeded
Dim dataGridViewRow1 As DataGridViewRow = _
dataGridView1.Rows(e.RowIndex)
toolStripMenuItem1.Enabled = True
' Show the appropriate ContextMenuStrip based on the employees title.
If dataGridViewRow1.Cells("Title").Value.ToString() = _
"Sales Manager" OrElse _
dataGridViewRow1.Cells("Title").Value.ToString() = _
"Vice President, Sales" Then
e.ContextMenuStrip = managerMenuStrip
Else
e.ContextMenuStrip = employeeMenuStrip
End If
contextMenuRowIndex = e.RowIndex
End Sub
Public Sub dataGridView1_CellToolTipTextNeeded(ByVal sender As Object, _
ByVal e As DataGridViewCellToolTipTextNeededEventArgs) _
Handles dataGridView1.CellToolTipTextNeeded
Dim newLine As String = Environment.NewLine
If e.RowIndex > -1 Then
Dim dataGridViewRow1 As DataGridViewRow = _
dataGridView1.Rows(e.RowIndex)
' Add the employee's ID to the ToolTipText.
e.ToolTipText = String.Format("EmployeeID {0}: {1}", _
dataGridViewRow1.Cells("EmployeeID").Value.ToString(), _
newLine)
' Add the employee's name to the ToolTipText.
e.ToolTipText += String.Format("{0} {1} {2} {3}", _
dataGridViewRow1.Cells("TitleOfCourtesy").Value.ToString(), _
dataGridViewRow1.Cells("FirstName").Value.ToString(), _
dataGridViewRow1.Cells("LastName").Value.ToString(), _
newLine)
' Add the employee's title to the ToolTipText.
e.ToolTipText += String.Format("{0}{1}{2}", _
dataGridViewRow1.Cells("Title").Value.ToString(), _
newLine, newLine)
' Add the employee's contact information to the ToolTipText.
e.ToolTipText += String.Format("{0}{1}{2}, ", _
dataGridViewRow1.Cells("Address").Value.ToString(), newLine, _
dataGridViewRow1.Cells("City").Value.ToString())
If Not String.IsNullOrEmpty( _
dataGridViewRow1.Cells("Region").Value.ToString())
e.ToolTipText += String.Format("{0}, ", _
dataGridViewRow1.Cells("Region").Value.ToString())
End If
e.ToolTipText += String.Format("{0}, {1}{2}{3} EXT:{4}{5}{6}", _
dataGridViewRow1.Cells("Country").Value.ToString(), _
dataGridViewRow1.Cells("PostalCode").Value.ToString(), _
newLine, _
dataGridViewRow1.Cells("HomePhone").Value.ToString(), _
dataGridViewRow1.Cells("Extension").Value.ToString(), _
newLine, newLine)
' Add employee information to the ToolTipText.
Dim HireDate As DateTime = _
CType(dataGridViewRow1.Cells("HireDate").Value, DateTime)
e.ToolTipText += _
String.Format("Employee since: {0}/{1}/{2}{3}Manager: {4}", _
HireDate.Month.ToString(), HireDate.Day.ToString(), _
HireDate.Year.ToString(), newLine, _
dataGridViewRow1.Cells("Manager").Value.ToString())
End If
End Sub
Public Sub toolStripMenuItem1_Click(ByVal sender As Object, _
ByVal e As EventArgs) Handles toolStripMenuItem1.Click
Dim dataGridViewRow1 As DataGridViewRow = _
dataGridView1.Rows(contextMenuRowIndex)
MessageBox.Show(String.Format( _
"Sales Report for {0} {1}:{2}{3}Reporting Not Implemented", _
dataGridViewRow1.Cells("FirstName").Value.ToString(), _
dataGridViewRow1.Cells("LastName").Value.ToString(), _
Environment.NewLine, Environment.NewLine))
End Sub
Public Sub toolStripMenuItem2_Click(ByVal sender As Object, _
ByVal e As EventArgs) Handles toolStripMenuItem2.Click
Dim dataGridViewRow1 As DataGridViewRow = _
dataGridView1.Rows(contextMenuRowIndex)
MessageBox.Show(String.Format( _
"Sales Report for {0} {1}:{2}{3}Reporting Not Implemented", _
dataGridViewRow1.Cells("FirstName").Value.ToString(), _
dataGridViewRow1.Cells("LastName").Value.ToString(), _
Environment.NewLine, Environment.NewLine))
End Sub
Public Sub toolStripMenuItem3_Click(ByVal sender As Object, _
ByVal e As EventArgs) Handles toolStripMenuItem3.Click
Dim dataGridViewRow1 As DataGridViewRow = _
dataGridView1.Rows(contextMenuRowIndex)
MessageBox.Show(String.Format( _
"Company Sales Ranking Report:{0}{1}Reporting not implemented.", _
Environment.NewLine, Environment.NewLine))
End Sub
End Class
Commenti
L'evento RowContextMenuStripNeeded si verifica solo quando la proprietà del controllo DataSource è impostata o la DataGridView relativa VirtualMode proprietà è true. RowContextMenuStripNeeded La gestione dell'evento è utile quando si vuole visualizzare un menu di scelta rapida determinato dallo stato corrente di una riga o dai valori contenuti.
Quando si gestisce l'evento RowContextMenuStripNeeded , viene visualizzato il menu di scelta rapida specificato nel gestore ogni volta che l'utente fa clic con il pulsante destro del mouse su una riga, a meno che l'evento CellContextMenuStripNeeded non sostituisci il menu di scelta rapida per la cella specifica che è stata selezionata.
L'evento RowContextMenuStripNeeded si verifica anche ogni volta che viene recuperato il valore della proprietà, a livello di codice o quando l'utente fa clic con il pulsante destro del DataGridViewRow.ContextMenuStrip mouse su una riga.
È possibile usare la RowIndex proprietà per determinare lo stato di una riga o i valori contenuti e usare queste informazioni per modificare o modificare la ContextMenuStrip proprietà. Questa proprietà viene inizializzata con il valore della proprietà di riga ContextMenuStrip , che il valore dell'evento esegue l'override.
Gestire l'evento quando si usano grandi quantità di dati per evitare le penali per le prestazioni dell'impostazione RowContextMenuStripNeeded del valore della riga ContextMenuStrip per più righe. Per altre informazioni, vedere Procedure consigliate per ridimensionare il controllo DataGridView Windows Form.
Per altre informazioni su come gestire gli eventi, vedere la gestione e generazione di eventi.
Costruttori
| DataGridViewRowContextMenuStripNeededEventArgs(Int32) |
Inizializza una nuova istanza della classe DataGridViewRowContextMenuStripNeededEventArgs. |
Proprietà
| ContextMenuStrip |
Ottiene o imposta il menu di scelta rapida per la riga che genera l'evento RowContextMenuStripNeeded. |
| RowIndex |
Ottiene l'indice della riga che richiede il menu di scelta rapida. |
Metodi
| Equals(Object) |
Determina se l'oggetto specificato è uguale all'oggetto corrente. (Ereditato da Object) |
| GetHashCode() |
Funge da funzione hash predefinita. (Ereditato da Object) |
| GetType() |
Ottiene l'oggetto Type dell'istanza corrente. (Ereditato da Object) |
| MemberwiseClone() |
Crea una copia superficiale dell'oggetto Object corrente. (Ereditato da Object) |
| ToString() |
Restituisce una stringa che rappresenta l'oggetto corrente. (Ereditato da Object) |
Si applica a
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