DataGridViewRowContextMenuStripNeededEventArgs Classe

Definição

public ref class DataGridViewRowContextMenuStripNeededEventArgs : EventArgs

public class DataGridViewRowContextMenuStripNeededEventArgs : EventArgs

type DataGridViewRowContextMenuStripNeededEventArgs = class
    inherit EventArgs

Public Class DataGridViewRowContextMenuStripNeededEventArgs
Inherits EventArgs

Herança

Object

EventArgs

DataGridViewRowContextMenuStripNeededEventArgs

Exemplos

O seguinte exemplo de código trata do RowContextMenuStripNeeded evento para fornecer um ContextMenuStrip com base no título do funcionário. Neste exemplo, existem dois menus de atalho, um para gestores e outro para todos os outros funcionários.

#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

Observações

O RowContextMenuStripNeeded evento ocorre apenas quando a DataGridView propriedade de controlo DataSource está definida ou a sua VirtualMode propriedade é true. Gerir o RowContextMenuStripNeeded evento é útil quando se quer mostrar um menu de atalho determinado pelo estado atual de uma linha ou pelos valores que ela contém.

Quando lidas com o RowContextMenuStripNeeded evento, o menu de atalhos que especificas no handler é mostrado sempre que o utilizador clica com o botão direito numa linha, a menos que o CellContextMenuStripNeeded evento sobreponha o menu de atalhos para a célula específica que foi clicada.

O RowContextMenuStripNeeded evento também ocorre sempre que o valor da DataGridViewRow.ContextMenuStrip propriedade é recuperado, seja programaticamente ou quando o utilizador clica com o botão direito numa linha.

Pode usar a RowIndex propriedade para determinar o estado de uma linha ou os valores que ela contém, e usar esta informação para alterar ou modificar a ContextMenuStrip propriedade. Esta propriedade é inicializada com o valor da propriedade linha ContextMenuStrip , que o valor do evento sobrepõe.

Trate do RowContextMenuStripNeeded evento ao trabalhar com grandes quantidades de dados para evitar as penalizações de desempenho de definir o valor da linha ContextMenuStrip para várias linhas. Para mais informações, consulte Boas Práticas para Escalar o Controlo Windows Forms DataGridView.

Para mais informações sobre como gerir eventos, consulte Gestão e Levantamento de Eventos.

Ver também

• ContextMenuStrip
• ContextMenuStrip
• DataGridView
• RowContextMenuStripNeeded
• DataSource
• VirtualMode
• OnRowContextMenuStripNeeded(DataGridViewRowContextMenuStripNeededEventArgs)
• DataGridViewRowContextMenuStripNeededEventHandler
• ContextMenuStrip