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Biblioteca MSDN
Desenvolvimento .NET
Versões Anteriores
.NET Framework 2.0
Referência da Biblioteca de classes
System.Windows.Forms Namespace
MessageBox Classe
Métodos MessageBox
Show Método
Show Método (String)
Show Método (IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, HelpNavigator, Object)
Show Método (String, String)
Show Método (IWin32Window, String)
Show Método (String, String, MessageBoxButtons)
Show Método (IWin32Window, String, String)
Show Método (String, String, MessageBoxButtons, MessageBoxIcon)
Show Método (IWin32Window, String, String, MessageBoxButtons)
Show Método (String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton)
Show Método (IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon)
Show Método (String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions)
Show Método (IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton)
Show Método (String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, Boolean)
Show Método (String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String)
Show Método (IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions)
Show Método (String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, String)
Show Método (String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, HelpNavigator)
Show Método (IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String)
Show Método (String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, HelpNavigator, Object)
Show Método (IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, String)
Show Método (IWin32Window, String, String, MessageBoxButtons, MessageBoxIcon, MessageBoxDefaultButton, MessageBoxOptions, String, HelpNavigator)
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MessageBox.Show Método (String, String, MessageBoxButtons, MessageBoxIcon)

.NET Framework 2.0

Exibe uma caixa de mensagem com texto especificado, legenda, botões e ícone.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (em System.Windows.Forms. dll)
C#
C++
JScript
VB
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public static DialogResult Show(
	string text,
	string caption,
	MessageBoxButtons buttons,
	MessageBoxIcon icon
)

Parâmetros

text
Tipo: System.String
O texto a ser Exibir na caixa de mensagem.
caption
Tipo: System.String
O texto a ser Exibir na barra de título de caixa de mensagem.
buttons
Tipo: System.Windows.Forms.MessageBoxButtons
One of the MessageBoxButtons values that specifies which buttons to display in the message box.
icon
Tipo: System.Windows.Forms.MessageBoxIcon
One of the MessageBoxIcon values that specifies which icon to display in the message box.

Valor de retorno

Tipo: System.Windows.Forms.DialogResult
One of the DialogResult values.
ExceçãoCondição
InvalidEnumArgumentException

The buttons parameter specified is not a member of MessageBoxButtons.

- ou -

The icon parameter specified is not a member of MessageBoxIcon.

InvalidOperationException

An attempt was made to display the MessageBox in a process that is not running in User Interactive mode.This is specified by the SystemInformation.UserInteractive property.

Você pode ter no máximo três botões na caixa de mensagem.

The following code example demonstrates one of the Show methods when handling the ComboBox.DropDown event.To run the example, paste the following code in a form and call the InitializeComboBox method from the form's constructor or Load method.

C#
C++
VB
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	// Declare ComboBox1.
	internal System.Windows.Forms.ComboBox ComboBox1;

	// Initialize ComboBox1.
	private void InitializeComboBox()
	{
		this.ComboBox1 = new ComboBox();
		this.ComboBox1.Location = new System.Drawing.Point(128, 48);
		this.ComboBox1.Name = "ComboBox1";
		this.ComboBox1.Size = new System.Drawing.Size(100, 21);
		this.ComboBox1.TabIndex = 0;
		this.ComboBox1.Text	= "Typical";
		string[] installs = new string[]{"Typical", "Compact", "Custom"};
		ComboBox1.Items.AddRange(installs);
		this.Controls.Add(this.ComboBox1);
		
		// Hook up the event handler.
		this.ComboBox1.DropDown +=  
			new System.EventHandler(ComboBox1_DropDown);
	}

	// Handles the ComboBox1 DropDown event. If the user expands the  
	// drop-down box, a message box will appear, recommending the
	// typical installation.
	private void ComboBox1_DropDown(object sender, System.EventArgs e)
	{
		MessageBox.Show("Typical installation is strongly recommended.", 
		"Install information", MessageBoxButtons.OK, 
			MessageBoxIcon.Information);
	}
J#
Copiar 
// Declare comboBox1.
System.Windows.Forms.ComboBox comboBox1;

// Initialize comboBox1.
private void InitializeComboBox()
{
    this.comboBox1 = new ComboBox();
    this.comboBox1.set_Location(new System.Drawing.Point(128, 48));
    this.comboBox1.set_Name("comboBox1");
    this.comboBox1.set_Size(new System.Drawing.Size(100, 21));
    this.comboBox1.set_TabIndex(0);
    this.comboBox1.set_Text("Typical");
    String installs[] = new String[] { "Typical", "Compact", "Custom" };
    comboBox1.get_Items().AddRange(installs);
    this.get_Controls().Add(this.comboBox1);
    // Hook up the event handler.
    this.comboBox1.add_DropDown(new System.EventHandler(
        comboBox1_DropDown));
} //InitializeComboBox

// Handles the comboBox1 DropDown event. If the user expands the  
// drop-down box, a message box will appear, recommending the
// typical installation.
private void comboBox1_DropDown(Object sender, System.EventArgs e)
{
    MessageBox.Show("Typical installation is strongly recommended.", 
        "Install information", MessageBoxButtons.OK, 
        MessageBoxIcon.Information);
} //comboBox1_DropDown
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