デフォルトのMessageBoxは現在のWindows OSテーマに依存するため、スタイルを変更できませんが、独自のMessageBoxを簡単に作成できます。次の設定でプロジェクトに新しいフォーム（つまり、MyNewMessageBox）を追加するだけです。
_FormBorderStyle FixedToolWindow
ShowInTaskBar False
StartPosition CenterScreen
_表示するには、myNewMessageBoxInstance.ShowDialog();を使用します。そして、OKやCancelなどのラベルとボタンをフォームに追加し、それらのDialogResultsを適切に設定します。つまり、MyNewMessageBoxにボタンを追加し、btnOKと呼びます。プロパティウィンドウでDialogResultプロパティを_DialogResult.OK_に設定します。そのボタンを押すと、OKの結果が返されます。
_MyNewMessageBox myNewMessageBoxInstance = new MyNewMessageBox();
DialogResult result = myNewMessageBoxInstance.ShowDialog();
if (result == DialogResult.OK)
{
// etc
}
_必要なテキストやその他のオプションを受け取る独自のShowメソッドを追加することをお勧めします。
_public DialogResult Show(string text, Color foreColour)
{
lblText.Text = text;
lblText.ForeColor = foreColour;
return this.ShowDialog();
}
_MessageBox::Showはuser32.dllの関数を使用し、そのスタイルはWindowsに依存するため、そのように変更することはできません。独自のフォームを作成する必要があります
独自のメッセージボックスを作成するために必要なコードは次のとおりです。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace MyStuff
{
public class MyLabel : Label
{
public static Label Set(string Text = "", Font Font = null, Color ForeColor = new Color(), Color BackColor = new Color())
{
Label l = new Label();
l.Text = Text;
l.Font = (Font == null) ? new Font("Calibri", 12) : Font;
l.ForeColor = (ForeColor == new Color()) ? Color.Black : ForeColor;
l.BackColor = (BackColor == new Color()) ? SystemColors.Control : BackColor;
l.AutoSize = true;
return l;
}
}
public class MyButton : Button
{
public static Button Set(string Text = "", int Width = 102, int Height = 30, Font Font = null, Color ForeColor = new Color(), Color BackColor = new Color())
{
Button b = new Button();
b.Text = Text;
b.Width = Width;
b.Height = Height;
b.Font = (Font == null) ? new Font("Calibri", 12) : Font;
b.ForeColor = (ForeColor == new Color()) ? Color.Black : ForeColor;
b.BackColor = (BackColor == new Color()) ? SystemColors.Control : BackColor;
b.UseVisualStyleBackColor = (b.BackColor == SystemColors.Control);
return b;
}
}
public class MyImage : PictureBox
{
public static PictureBox Set(string ImagePath = null, int Width = 60, int Height = 60)
{
PictureBox i = new PictureBox();
if (ImagePath != null)
{
i.BackgroundImageLayout = ImageLayout.Zoom;
i.Location = new Point(9, 9);
i.Margin = new Padding(3, 3, 2, 3);
i.Size = new Size(Width, Height);
i.TabStop = false;
i.Visible = true;
i.BackgroundImage = Image.FromFile(ImagePath);
}
else
{
i.Visible = true;
i.Size = new Size(0, 0);
}
return i;
}
}
public partial class MyMessageBox : Form
{
private MyMessageBox()
{
this.panText = new FlowLayoutPanel();
this.panButtons = new FlowLayoutPanel();
this.SuspendLayout();
//
// panText
//
this.panText.Parent = this;
this.panText.AutoScroll = true;
this.panText.AutoSize = true;
this.panText.AutoSizeMode = AutoSizeMode.GrowAndShrink;
//this.panText.Location = new Point(90, 90);
this.panText.Margin = new Padding(0);
this.panText.MaximumSize = new Size(500, 300);
this.panText.MinimumSize = new Size(108, 50);
this.panText.Size = new Size(108, 50);
//
// panButtons
//
this.panButtons.AutoSize = true;
this.panButtons.AutoSizeMode = AutoSizeMode.GrowAndShrink;
this.panButtons.FlowDirection = FlowDirection.RightToLeft;
this.panButtons.Location = new Point(89, 89);
this.panButtons.Margin = new Padding(0);
this.panButtons.MaximumSize = new Size(580, 150);
this.panButtons.MinimumSize = new Size(108, 0);
this.panButtons.Size = new Size(108, 35);
//
// MyMessageBox
//
this.AutoScaleDimensions = new SizeF(8F, 19F);
this.AutoScaleMode = AutoScaleMode.Font;
this.ClientSize = new Size(206, 133);
this.Controls.Add(this.panButtons);
this.Controls.Add(this.panText);
this.Font = new Font("Calibri", 12F, FontStyle.Regular, GraphicsUnit.Point, ((byte)(0)));
this.FormBorderStyle = FormBorderStyle.FixedSingle;
this.Margin = new Padding(4);
this.MaximizeBox = false;
this.MinimizeBox = false;
this.MinimumSize = new Size(168, 132);
this.Name = "MyMessageBox";
this.ShowIcon = false;
this.ShowInTaskbar = false;
this.StartPosition = FormStartPosition.CenterScreen;
this.ResumeLayout(false);
this.PerformLayout();
}
public static string Show(Label Label, string Title = "", List<Button> Buttons = null, PictureBox Image = null)
{
List<Label> Labels = new List<Label>();
Labels.Add(Label);
return Show(Labels, Title, Buttons, Image);
}
public static string Show(string Label, string Title = "", List<Button> Buttons = null, PictureBox Image = null)
{
List<Label> Labels = new List<Label>();
Labels.Add(MyLabel.Set(Label));
return Show(Labels, Title, Buttons, Image);
}
public static string Show(List<Label> Labels = null, string Title = "", List<Button> Buttons = null, PictureBox Image = null)
{
if (Labels == null) Labels = new List<Label>();
if (Labels.Count == 0) Labels.Add(MyLabel.Set(""));
if (Buttons == null) Buttons = new List<Button>();
if (Buttons.Count == 0) Buttons.Add(MyButton.Set("OK"));
List<Button> buttons = new List<Button>(Buttons);
buttons.Reverse();
int ImageWidth = 0;
int ImageHeight = 0;
int LabelWidth = 0;
int LabelHeight = 0;
int ButtonWidth = 0;
int ButtonHeight = 0;
int TotalWidth = 0;
int TotalHeight = 0;
MyMessageBox mb = new MyMessageBox();
mb.Text = Title;
//Image
if (Image != null)
{
mb.Controls.Add(Image);
Image.MaximumSize = new Size(150, 300);
ImageWidth = Image.Width + Image.Margin.Horizontal;
ImageHeight = Image.Height + Image.Margin.Vertical;
}
//Labels
List<int> il = new List<int>();
mb.panText.Location = new Point(9 + ImageWidth, 9);
foreach (Label l in Labels)
{
mb.panText.Controls.Add(l);
l.Location = new Point(200, 50);
l.MaximumSize = new Size(480, 2000);
il.Add(l.Width);
}
int mw = Labels.Max(x => x.Width);
il.ToString();
Labels.ForEach(l => l.MinimumSize = new Size(Labels.Max(x => x.Width), 1));
mb.panText.Height = Labels.Sum(l => l.Height);
mb.panText.MinimumSize = new Size(Labels.Max(x => x.Width) + mb.ScrollBarWidth(Labels), ImageHeight);
mb.panText.MaximumSize = new Size(Labels.Max(x => x.Width) + mb.ScrollBarWidth(Labels), 300);
LabelWidth = mb.panText.Width;
LabelHeight = mb.panText.Height;
//Buttons
foreach (Button b in buttons)
{
mb.panButtons.Controls.Add(b);
b.Location = new Point(3, 3);
b.TabIndex = Buttons.FindIndex(i => i.Text == b.Text);
b.Click += new EventHandler(mb.Button_Click);
}
ButtonWidth = mb.panButtons.Width;
ButtonHeight = mb.panButtons.Height;
//Set Widths
if (ButtonWidth > ImageWidth + LabelWidth)
{
Labels.ForEach(l => l.MinimumSize = new Size(ButtonWidth - ImageWidth - mb.ScrollBarWidth(Labels), 1));
mb.panText.Height = Labels.Sum(l => l.Height);
mb.panText.MinimumSize = new Size(Labels.Max(x => x.Width) + mb.ScrollBarWidth(Labels), ImageHeight);
mb.panText.MaximumSize = new Size(Labels.Max(x => x.Width) + mb.ScrollBarWidth(Labels), 300);
LabelWidth = mb.panText.Width;
LabelHeight = mb.panText.Height;
}
TotalWidth = ImageWidth + LabelWidth;
//Set Height
TotalHeight = LabelHeight + ButtonHeight;
mb.panButtons.Location = new Point(TotalWidth - ButtonWidth + 9, mb.panText.Location.Y + mb.panText.Height);
mb.Size = new Size(TotalWidth + 25, TotalHeight + 47);
mb.ShowDialog();
return mb.Result;
}
private FlowLayoutPanel panText;
private FlowLayoutPanel panButtons;
private int ScrollBarWidth(List<Label> Labels)
{
return (Labels.Sum(l => l.Height) > 300) ? 23 : 6;
}
private void Button_Click(object sender, EventArgs e)
{
Result = ((Button)sender).Text;
Close();
}
private string Result = "";
}
}
プロジェクトにwinformを追加し（frmShowMessageという名前を付けました）、このコントロールを配置します。
1. Panel (pnlShowMessage)
2. Label (lblMessageText)
3. PictureBox (pictureBox1)
4. ImageList (imageList1)
新しいフォームコードを次のように置き換えます。
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace CostumeMessageBox
{
public partial class frmShowMessage : Form
{
Button btnOk = new Button(); //Create object of Button.
Button btnCancel = new Button();
Button btnNo = new Button();
Button btnYes = new Button();
public const int WM_NCLBUTTONDOWN = 0xA1;
public const int HT_CAPTION = 0x2;
[DllImportAttribute("user32.dll")]
public static extern int SendMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
[DllImport("user32.dll")]
public static extern bool ReleaseCapture();
public frmShowMessage()
{
InitializeComponent();
}
/// <summary>
/// Here I am overriding Paint method of form object
/// and set it's background color as gradient. Here I am
/// using LinearGradientBrush class object to make gradient
/// color which comes in System.Drawing.Drawing2D namespace.
/// </summary>
/// <param name="e"></param>
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
ControlPaint.DrawBorder(e.Graphics, ClientRectangle,
Color.DarkRed, 3, ButtonBorderStyle.Solid,
Color.DarkRed, 3, ButtonBorderStyle.Solid,
Color.DarkRed, 3, ButtonBorderStyle.Solid,
Color.DarkRed, 3, ButtonBorderStyle.Solid);
//Rectangle rect = this.ClientRectangle;
//LinearGradientBrush brush = new LinearGradientBrush(rect, Color.Snow, Color.SeaShell, 60); //LightCyan Lavender LightGray
//e.Graphics.FillRectangle(brush, rect);
//base.OnPaint(e);
}
private void frmShowMessage_Load(object sender, EventArgs e)
{
btnOk.Text = "تایید"; //Here we set text of Button.
btnOk.DialogResult = DialogResult.OK; //Set DialogResult property of button.
btnOk.FlatStyle = FlatStyle.Popup; //Set flat appearence of button.
btnOk.BackColor = Color.Beige;
btnOk.FlatAppearance.BorderSize = 0;
btnCancel.Text = "انصراف";
btnCancel.DialogResult = DialogResult.Cancel;
btnCancel.FlatStyle = FlatStyle.Popup;
btnCancel.BackColor = Color.Beige;
btnCancel.FlatAppearance.BorderSize = 0;
btnNo.Text = "خیر";
btnNo.DialogResult = DialogResult.No;
btnNo.FlatStyle = FlatStyle.Popup;
btnNo.BackColor = Color.Beige;
btnNo.FlatAppearance.BorderSize = 0;
btnYes.Text = "بله";
btnYes.DialogResult = DialogResult.Yes;
btnYes.FlatStyle = FlatStyle.Popup;
btnYes.BackColor = Color.Beige;
btnYes.FlatAppearance.BorderSize = 0;
}
/// <summary>
/// setMessage method is used to display message
/// on form and it's height adjust automatically.
/// I am displaying message in a Label control.
/// </summary>
/// <param name="messageText">Message which needs to be displayed to user.</param>
private void setMessage(string messageText)
{
int number = Math.Abs(messageText.Length / 30);
if (number != 0)
{
lblMessageText.Height = lblRightBorder.Height = number*25;
Height = lblMessageText.Height;
}
lblMessageText.Text = messageText;
}
/// <summary>
/// This method is used to add button on message box.
/// </summary>
/// <param name="MessageButton">MessageButton is type of enumMessageButton
/// through which I get type of button which needs to be displayed.</param>
private void addButton(enumMessageButton MessageButton)
{
switch (MessageButton)
{
case enumMessageButton.OK:
{
//If type of enumButton is OK then we add OK button only.
btnOk.SetBounds(pnlShowMessage.ClientSize.Width - 80, 5, 75, 25); // Set bounds of button.
pnlShowMessage.Controls.Add(btnOk); //Finally Add button control on panel.
}
break;
case enumMessageButton.OKCancel:
{
btnOk.SetBounds((pnlShowMessage.ClientSize.Width - 70), 5, 65, 25);
pnlShowMessage.Controls.Add(btnOk);
btnCancel.SetBounds((pnlShowMessage.ClientSize.Width - (btnOk.ClientSize.Width + 5 + 80)), 5, 75, 25);
pnlShowMessage.Controls.Add(btnCancel);
}
break;
case enumMessageButton.YesNo:
{
btnNo.SetBounds((pnlShowMessage.ClientSize.Width - 70), 5, 65, 25);
pnlShowMessage.Controls.Add(btnNo);
btnYes.SetBounds((pnlShowMessage.ClientSize.Width - (btnNo.ClientSize.Width + 5 + 80)), 5, 75, 25);
pnlShowMessage.Controls.Add(btnYes);
}
break;
case enumMessageButton.YesNoCancel:
{
btnCancel.SetBounds((pnlShowMessage.ClientSize.Width - 70), 5, 65, 25);
pnlShowMessage.Controls.Add(btnCancel);
btnNo.SetBounds((pnlShowMessage.ClientSize.Width - (btnCancel.ClientSize.Width + 5 + 80)), 5, 75, 25);
pnlShowMessage.Controls.Add(btnNo);
btnYes.SetBounds((pnlShowMessage.ClientSize.Width - (btnCancel.ClientSize.Width + btnNo.ClientSize.Width + 10 + 80)), 5, 75, 25);
pnlShowMessage.Controls.Add(btnYes);
}
break;
}
}
/// <summary>
/// We can use this method to add image on message box.
/// I had taken all images in ImageList control so that
/// I can eaily add images. Image is displayed in
/// PictureBox control.
/// </summary>
/// <param name="MessageIcon">Type of image to be displayed.</param>
private void addIconImage(enumMessageIcon MessageIcon)
{
switch (MessageIcon)
{
case enumMessageIcon.Error:
pictureBox1.Image = imageList1.Images["Error"]; //Error is key name in imagelist control which uniqly identified images in ImageList control.
break;
case enumMessageIcon.Information:
pictureBox1.Image = imageList1.Images["Information"];
break;
case enumMessageIcon.Question:
pictureBox1.Image = imageList1.Images["Question"];
break;
case enumMessageIcon.Warning:
pictureBox1.Image = imageList1.Images["Warning"];
break;
}
}
#region Overloaded Show message to display message box.
/// <summary>
/// Show method is overloaded which is used to display message
/// and this is static method so that we don't need to create
/// object of this class to call this method.
/// </summary>
/// <param name="messageText"></param>
internal static DialogResult Show(string messageText)
{
frmShowMessage frmMessage = new frmShowMessage();
frmMessage.setMessage(messageText);
frmMessage.addIconImage(enumMessageIcon.Information);
frmMessage.addButton(enumMessageButton.OK);
frmMessage.ShowDialog();
return frmMessage.DialogResult;
}
internal static DialogResult Show(string messageText, string messageTitle)
{
frmShowMessage frmMessage = new frmShowMessage();
frmMessage.Text = messageTitle;
frmMessage.setMessage(messageText);
frmMessage.addIconImage(enumMessageIcon.Information);
frmMessage.addButton(enumMessageButton.OK);
frmMessage.ShowDialog();
return frmMessage.DialogResult;
}
internal static DialogResult Show(string messageText, string messageTitle, enumMessageIcon messageIcon,
enumMessageButton messageButton)
{
frmShowMessage frmMessage = new frmShowMessage();
frmMessage.setMessage(messageText);
frmMessage.Text = messageTitle;
frmMessage.addIconImage(messageIcon);
frmMessage.addButton(messageButton);
frmMessage.ShowDialog();
return frmMessage.DialogResult;
}
#endregion
private void frmShowMessage_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left) return;
ReleaseCapture();
SendMessage(Handle, WM_NCLBUTTONDOWN, HT_CAPTION, 0);
}
}
#region constant defiend in form of enumration which is used in showMessage class.
internal enum enumMessageIcon
{
Error,
Warning,
Information,
Question,
}
internal enum enumMessageButton
{
OK,
YesNo,
YesNoCancel,
OKCancel
}
#endregion
}
これで、Customized MessageBox次のようなプロジェクトで：
private void btnQuestion_Click(object sender, EventArgs e)
{
frmShowMessage.Show(rch.Text,
"Message Text", enumMessageIcon.Question, enumMessageButton.YesNoCancel);
}
private void btnInformation_Click(object sender, EventArgs e)
{
frmShowMessage.Show(rch.Text,
"Message Text", enumMessageIcon.Information, enumMessageButton.OKCancel);
}
private void btnError_Click(object sender, EventArgs e)
{
frmShowMessage.Show(rch.Text,
"Message Text", enumMessageIcon.Error, enumMessageButton.OK);
}
private void btnWarning_Click(object sender, EventArgs e)
{
frmShowMessage.Show(rch.Text,
"Message Text", enumMessageIcon.Warning, enumMessageButton.YesNo);
}
これを学んだリンクを忘れてしまった