DataGridViewRowContextMenuStripNeededEventArgs Classe

Definição

Namespace:

System.Windows.Forms

Assembly:

System.Windows.Forms.dll

Origem:

DataGridViewRowContextMenuStripNeededEventArgs.cs

Fornece dados para o evento de RowContextMenuStripNeeded .

C#

public class DataGridViewRowContextMenuStripNeededEventArgs : EventArgs

Herança

Object

EventArgs

DataGridViewRowContextMenuStripNeededEventArgs

Exemplos

O exemplo de código a seguir manipula o RowContextMenuStripNeeded evento para fornecer um ContextMenuStrip com base no título do funcionário. Neste exemplo, há dois menus de atalho, um para gerentes e outro para todos os outros funcionários.

C#

#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));
    }
}

Comentários

O RowContextMenuStripNeeded evento ocorre somente quando a DataGridView propriedade de controle DataSource é definida ou sua VirtualMode propriedade é true. Manipular o RowContextMenuStripNeeded evento é útil quando você deseja exibir um menu de atalho determinado pelo estado atual de uma linha ou pelos valores que ele contém.

Quando você manipula o RowContextMenuStripNeeded evento, o menu de atalho especificado no manipulador é mostrado sempre que o usuário clica com o botão direito do mouse em uma linha, a menos que o CellContextMenuStripNeeded evento substitua o menu de atalho para a célula específica que foi clicada.

O RowContextMenuStripNeeded evento também ocorre sempre que o valor da DataGridViewRow.ContextMenuStrip propriedade é recuperado, programaticamente ou quando o usuário clica com o botão direito do mouse em uma linha.

Você pode usar a RowIndex propriedade para determinar o estado de uma linha ou os valores que ela contém e usar essas informações para alterar ou modificar a ContextMenuStrip propriedade. Essa propriedade é inicializada com o valor da propriedade de linha ContextMenuStrip , que o valor do evento substitui.

Manipule o RowContextMenuStripNeeded evento ao trabalhar com grandes quantidades de dados para evitar as penalidades de desempenho de definir o valor da linha ContextMenuStrip para várias linhas. Para obter mais informações, consulte Práticas recomendadas para colocação em escala do controle DataGridView dos Windows Forms.

Para obter mais informações sobre como lidar com eventos, consulte Manipulando e levantando eventos.

Construtores

DataGridViewRowContextMenuStripNeededEventArgs(Int32)

Inicializa uma nova instância da classe DataGridViewRowContextMenuStripNeededEventArgs.

Propriedades

ContextMenuStrip	Obtém ou define o menu de atalho da linha que gerou o evento RowContextMenuStripNeeded.
RowIndex	Obtém o índice da linha que está solicitando um menu de atalho.

Aplica-se a

Confira também

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