C# MessageBox.Show方法代码示例

private void DisplayMessageBoxText()
{
         MessageBox.Show("Hello, world.");
}

// Display message box parented to the main form. 
// The Help button opens the Mspaint.chm Help file, 
// and the "mspaint.chm::/paint_brush.htm" Help keyword shows the 
// associated topic.
DialogResult r8 = MessageBox.Show (this, "Message with Help file and keyword.", 
                                   "Help Caption", MessageBoxButtons.OK, 
                                   MessageBoxIcon.Question, 
                                   MessageBoxDefaultButton.Button1, 0, 
                                   "mspaint.chm", 
                                   "mspaint.chm::/paint_brush.htm");

//引入命名空间
using System;
using System.Drawing;
using System.ComponentModel;
using System.Windows.Forms;

// Display a message box. The Help button opens the Mspaint.chm Help file, 
// shows index with the "ovals" keyword selected, and displays the
// associated topic.
DialogResult r5 = MessageBox.Show ("Message with Help file and Help navigator with additional parameter.", 
                                   "Help Caption", MessageBoxButtons.OK, 
                                   MessageBoxIcon.Question, 
                                   MessageBoxDefaultButton.Button1, 
                                   0, "mspaint.chm", 
                                   HelpNavigator.KeywordIndex, "ovals");

// Display a message box parented to the main form. 
// The Help button opens the Mspaint.chm Help file.
DialogResult r2 = MessageBox.Show (this, "Message with Help file.", 
                                   "Help Caption", MessageBoxButtons.OK, 
                                   MessageBoxIcon.Question, 
                                   MessageBoxDefaultButton.Button1, 
                                   0, 
                                   "mspaint.chm");

// Display a message box. The Help button opens 
// the Mspaint.chm Help file and shows the Help contents 
// on the Index tab.
DialogResult r3 = MessageBox.Show ("Message with Help file and Help navigator.", 
                                   "Help Caption", MessageBoxButtons.OK,
                                   MessageBoxIcon.Question, 
                                   MessageBoxDefaultButton.Button1, 
                                   0, "mspaint.chm", 
                                   HelpNavigator.Index);

// Display a message box. The Help button opens the Mspaint.chm Help file, 
// and the "mspaint.chm::/paint_brush.htm" Help keyword shows the 
// associated topic.
DialogResult r7 = MessageBox.Show ("Message with Help file and keyword.", 
                                   "Help Caption", MessageBoxButtons.OK, 
                                   MessageBoxIcon.Question, 
                                   MessageBoxDefaultButton.Button1, 0, 
                                   "mspaint.chm", 
                                   "mspaint.chm::/paint_brush.htm");

private void validateUserEntry2()
{

    // Checks the value of the text.

    if(serverName.Text.Length == 0)
    {

        // Initializes the variables to pass to the MessageBox.Show method.

        string message = "You did not enter a server name. Cancel this operation?";
        string caption = "No Server Name Specified";
        MessageBoxButtons buttons = MessageBoxButtons.YesNo;
        DialogResult result;

        // Displays the MessageBox.

        result = MessageBox.Show(this, message, caption, buttons,
            MessageBoxIcon.Question, MessageBoxDefaultButton.Button1, 
            MessageBoxOptions.RightAlign);

        if(result == DialogResult.Yes)
        {

            // Closes the parent form.

            this.Close();
        }
    }
}

// Display a message box with a help button. 
// The Help button opens the Mspaint.chm Help file.
DialogResult r1 = MessageBox.Show ("Message with Help file.", 
                                   "Help Caption", MessageBoxButtons.OK, 
                                   MessageBoxIcon.Question, 
                                   MessageBoxDefaultButton.Button1, 
                                   0, 
                                   "mspaint.chm");

// Display a message box with a Help button. Show a custom Help window
// by handling the HelpRequested event.
private DialogResult AlertMessageWithCustomHelpWindow ()
{
    // Handle the HelpRequested event for the following message.
    this.HelpRequested += new System.Windows.Forms.HelpEventHandler (this.Form1_HelpRequested);

    this.Tag = "Message with Help button.";

    // Show a message box with OK and Help buttons.
    DialogResult r = MessageBox.Show ("Message with Help button.", 
                                      "Help Caption", MessageBoxButtons.OK, 
                                      MessageBoxIcon.Question, 
                                      MessageBoxDefaultButton.Button1, 
                                      0, true);

    // Remove the HelpRequested event handler to keep the event
    // from being handled for other message boxes.
    this.HelpRequested -= new System.Windows.Forms.HelpEventHandler (this.Form1_HelpRequested);

    // Return the dialog box result.
    return r;
}

private void Form1_HelpRequested (System.Object sender, System.Windows.Forms.HelpEventArgs hlpevent)
{
    // Create a custom Help window in response to the HelpRequested event.
    Form helpForm = new Form ();

    // Set up the form position, size, and title caption.
    helpForm.StartPosition = FormStartPosition.Manual;
    helpForm.Size = new Size (200, 400);
    helpForm.DesktopLocation = new Point (this.DesktopBounds.X + 
                                          this.Size.Width, 
                                          this.DesktopBounds.Top);
    helpForm.Text = "Help Form";

    // Create a label to contain the Help text.
    Label helpLabel = new Label ();

    // Add the label to the form and set its text.
    helpForm.Controls.Add (helpLabel);
    helpLabel.Dock = DockStyle.Fill;

    // Use the sender parameter to identify the context of the Help request.
    // The parameter must be cast to the Control type to get the Tag property.
    Control senderControl = sender as Control;

    helpLabel.Text = "Help information shown in response to user action on the '" + 
                      (string)senderControl.Tag + "' message.";

    // Set the Help form to be owned by the main form. This helps
    // to ensure that the Help form is disposed of.
    this.AddOwnedForm (helpForm);

    // Show the custom Help window.
    helpForm.Show ();

    // Indicate that the HelpRequested event is handled.
    hlpevent.Handled = true;
}

// Display message box parented to the main form. 
// The Help button opens the Mspaint.chm Help file
// and shows the Help contents on the Index tab.
DialogResult r4 = MessageBox.Show (this, 
                                   "Message with Help file and Help navigator.", 
                                   "Help Caption", MessageBoxButtons.OK,
                                   MessageBoxIcon.Question, 
                                   MessageBoxDefaultButton.Button1, 
                                   0, "mspaint.chm", 
                                   HelpNavigator.Index);

private void validateUserEntry4()
{

    // Checks the value of the text.

    if(serverName.Text.Length == 0)
    {

        // Initializes the variables to pass to the MessageBox.Show method.

        string message = "You did not enter a server name. Cancel this operation?";
        string caption = "No Server Name Specified";
        MessageBoxButtons buttons = MessageBoxButtons.YesNo;
        DialogResult result;

        // Displays the MessageBox.

        result = MessageBox.Show(this, message, caption, buttons,
            MessageBoxIcon.Question);

        if(result == DialogResult.Yes)
        {

            // Closes the parent form.

            this.Close();
        }
    }
}

private void validateUserEntry3()
{

    // Checks the value of the text.

    if(serverName.Text.Length == 0)
    {

        // Initializes the variables to pass to the MessageBox.Show method.

        string message = "You did not enter a server name. Cancel this operation?";
        string caption = "No Server Name Specified";
        MessageBoxButtons buttons = MessageBoxButtons.YesNo;
        DialogResult result;

        // Displays the MessageBox.

        result = MessageBox.Show(this, message, caption, buttons,
        MessageBoxIcon.Question, MessageBoxDefaultButton.Button1);

        if(result == DialogResult.Yes)
        {

            // Closes the parent form.

            this.Close();
        }
    }
}

private void validateUserEntry5()
{

    // Checks the value of the text.

    if(serverName.Text.Length == 0)
    {

        // Initializes the variables to pass to the MessageBox.Show method.

        string message = "You did not enter a server name. Cancel this operation?";
        string caption = "No Server Name Specified";
        MessageBoxButtons buttons = MessageBoxButtons.YesNo;
        DialogResult result;

        // Displays the MessageBox.

        result = MessageBox.Show(this, message, caption, buttons);

        if(result == DialogResult.Yes)
        {

            // Closes the parent form.

            this.Close();
        }
    }
}

// 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);
}