本文整理汇总了C#中System.Windows.Forms.CreateParams类的典型用法代码示例。如果您正苦于以下问题:C# CreateParams类的具体用法?C# CreateParams怎么用?C# CreateParams使用的例子?那么, 这里精选的类代码示例或许可以为您提供帮助。
CreateParams类属于System.Windows.Forms命名空间,在下文中一共展示了CreateParams类的2个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C#代码示例。
示例1: MyIconButton
//引入命名空间
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.IO;
using System.Security.Permissions;
[SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)]
public class MyIconButton : Button
{
private Icon icon;
public MyIconButton()
{
// Set the button's FlatStyle property.
FlatStyle = FlatStyle.System;
}
public MyIconButton(Icon ButtonIcon)
: this()
{
// Assign the icon to the private field.
this.icon = ButtonIcon;
// Size the button to 4 pixels larger than the icon.
this.Height = icon.Height + 4;
this.Width = icon.Width + 4;
}
protected override CreateParams CreateParams
{
get
{
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();
// Extend the CreateParams property of the Button class.
CreateParams cp = base.CreateParams;
// Update the button Style.
cp.Style |= 0x00000040; // BS_ICON value
return cp;
}
}
public Icon Icon
{
get
{
return icon;
}
set
{
icon = value;
UpdateIcon();
// Size the button to 4 pixels larger than the icon.
this.Height = icon.Height + 4;
this.Width = icon.Width + 4;
}
}
[SecurityPermission(SecurityAction.Demand, UnmanagedCode = true)]
protected override void OnHandleCreated(EventArgs e)
{
base.OnHandleCreated(e);
// Update the icon on the button if there is currently an icon assigned to the icon field.
if (icon != null)
{
UpdateIcon();
}
}
private void UpdateIcon()
{
IntPtr iconHandle = IntPtr.Zero;
// Get the icon's handle.
if (icon != null)
{
iconHandle = icon.Handle;
}
// Send Windows the message to update the button.
SendMessage(Handle, 0x00F7 /*BM_SETIMAGE value*/, 1 /*IMAGE_ICON value*/, (int)iconHandle);
}
// Import the SendMessage method of the User32 DLL.
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
}
示例2: MyApplication
public class MyApplication : Form
{
private MyIconButton myIconButton;
private Button stdButton;
private OpenFileDialog openDlg;
static void Main()
{
Application.Run(new MyApplication());
}
public MyApplication()
{
try
{
// Create the button with the default icon.
myIconButton = new MyIconButton(new Icon(Application.StartupPath + "\\Default.ico"));
}
catch (Exception ex)
{
// If the default icon does not exist, create the button without an icon.
myIconButton = new MyIconButton();
Debug.WriteLine(ex.ToString());
}
finally
{
stdButton = new Button();
// Add the Click event handlers.
myIconButton.Click += new EventHandler(this.myIconButton_Click);
stdButton.Click += new EventHandler(this.stdButton_Click);
// Set the location, text and width of the standard button.
stdButton.Location = new Point(myIconButton.Location.X, myIconButton.Location.Y + myIconButton.Height + 20);
stdButton.Text = "Change Icon";
stdButton.Width = 100;
// Add the buttons to the Form.
this.Controls.Add(stdButton);
this.Controls.Add(myIconButton);
}
}
private void myIconButton_Click(object Sender, EventArgs e)
{
// Make sure MyIconButton works.
MessageBox.Show("MyIconButton was clicked!");
}
private void stdButton_Click(object Sender, EventArgs e)
{
// Use an OpenFileDialog to allow the user to assign a new image to the derived button.
openDlg = new OpenFileDialog();
openDlg.InitialDirectory = Application.StartupPath;
openDlg.Filter = "Icon files (*.ico)|*.ico";
openDlg.Multiselect = false;
openDlg.ShowDialog();
if (openDlg.FileName != "")
{
myIconButton.Icon = new Icon(openDlg.FileName);
}
}
}