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步驟 10：建立其他按鈕和核取方塊

  • 發行項

現在，您可以準備完成其他四個方法。您可以複製及貼上此程式碼，但如果想要充分學習本教學課程，請輸入程式碼並使用 IntelliSense。

注意事項注意事項

最好的做法是永遠為程式碼加上註解。註解是供使用者閱讀的資訊，值得花時間讓您的程式碼變得更易於理解。程式會忽略註解行上的任何文字。在 Visual C# 中，在一行的開頭輸入兩個斜線 (//)，即可將此行變成註解，在 Visual Basic 中，在一行的開頭加上單引號 (') 可將一行變成註解。

若要建立其他按鈕和核取方塊

  • 加入下列程式碼。

    Private Sub clearButton_Click() Handles clearButton.Click
    ' Clear the picture.
    PictureBox1.Image = Nothing
End Sub

Private Sub backgroundButton_Click() Handles backgroundButton.Click
    ' Show the color dialog box. If the user clicks OK, change the
    ' PictureBox control's background to the color the user chose.
    If ColorDialog1.ShowDialog() = DialogResult.OK Then
        PictureBox1.BackColor = ColorDialog1.Color
    End If
End Sub

Private Sub closeButton_Click() Handles closeButton.Click
    ' Close the form.
    Close()
End Sub

Private Sub CheckBox1_CheckedChanged() Handles CheckBox1.CheckedChanged
    ' If the user selects the Stretch check box, change 
    ' the PictureBox's SizeMode property to "Stretch". If the user 
    ' clears the check box, change it to "Normal".
    If CheckBox1.Checked Then
        PictureBox1.SizeMode = PictureBoxSizeMode.StretchImage
    Else
        PictureBox1.SizeMode = PictureBoxSizeMode.Normal
    End If
End Sub

    private void clearButton_Click(object sender, EventArgs e)
{
    // Clear the picture.
    pictureBox1.Image = null;
}

private void backgroundButton_Click(object sender, EventArgs e)
{
    // Show the color dialog box. If the user clicks OK, change the
    // PictureBox control's background to the color the user chose.
    if (colorDialog1.ShowDialog() == DialogResult.OK)
        pictureBox1.BackColor = colorDialog1.Color;
}

private void closeButton_Click(object sender, EventArgs e)
{
    // Close the form.
    this.Close();
}

private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
    // If the user selects the Stretch check box, 
    // change the PictureBox's
    // SizeMode property to "Stretch". If the user clears 
    // the check box, change it to "Normal".
    if (checkBox1.Checked)
        pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
    else
        pictureBox1.SizeMode = PictureBoxSizeMode.Normal;
}

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