winfrom中from 和usercontrol不断闪烁处理方法
原因1：from自己绘制了或者用usercontrol控件，form窗体会不变的闪烁，
原因2：form中图片太多，窗口重叠也严重，每次滚动条滚动时，闪烁非常厉害，cpu使用也超高,配置很好的机器可能看不出来。
解决方法：
第一个方法：利用DoubleBuffer 设置 true，用双缓存处理Form界面内容加载，可以提高页面显示质量。有点效果，配置差的机器可能会很明显的再次闪
第二个方法：
在Form及UserControl上重新写CreateParams，代码如下
Form上的Code
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x02000000; // Turn on WS_EX_COMPOSITED
return cp;
}
}
UserControl的Code
protected override CreateParams CreateParams
{
get
{
var parms = base.CreateParams;
parms.Style &= ~0x02000000; // Turn off WS_CLIPCHILDREN
return parms;
}
}
详细参考
http://stackoverflow.com/questions/2612487/how-to-fix-the-flickering-in-user-controls
WS_CLIPCHILDREN-不包括子窗口的父窗口中绘制时所占用的区域。创建父窗口时使用。
WS_CLIPSIBLING，必须用于子窗体，使得该子窗体在收到WM_PAINT时同时令其共父的诸多子窗体（MSDN讲必须不在该区域，即不与之重叠）也会被PAINT。
详细参考
http://blog.163.com/sandylin_wind/blog/static/935500552008105104617806/
The following are the extended window styles.
| Constant/value | Description |
|---|---|
| The window accepts drag-drop files. |
| Forces a top-level window onto the taskbar when the window is visible. |
| The window has a border with a sunken edge. |
| Paints all descendants of a window in bottom-to-top painting order using double-buffering. For more information, see Remarks. This cannot be used if the window has aclass style of either CS_OWNDC or CS_CLASSDC.
|
| The title bar of the window includes a question mark. When the user clicks the question mark, the cursor changes to a question mark with a pointer. If the user then clicks a child window, the child receives aWM_HELP message. The child window should pass the message to the parent window procedure, which should call theWinHelp function using theHELP_WM_HELP command. The Help application displays a pop-up window that typically contains help for the child window. WS_EX_CONTEXTHELP cannot be used with the WS_MAXIMIZEBOX orWS_MINIMIZEBOX styles. |
| The window itself contains child windows that should take part in dialog box navigation. If this style is specified, the dialog manager recurses into children of this window when performing navigation operations such as handling the TAB key, an arrow key, or a keyboard mnemonic. |
| The window has a double border; the window can, optionally, be created with a title bar by specifying theWS_CAPTION style in thedwStyle parameter. |
| The window is a layered window. This style cannot be used if the window has a class style of either CS_OWNDC or CS_CLASSDC.
|
| If the shell language is Hebrew, Arabic, or another language that supports reading order alignment, the horizontal origin of the window is on the right edge. Increasing horizontal values advance to the left. |
| The window has generic left-aligned properties. This is the default. |
| If the shell language is Hebrew, Arabic, or another language that supports reading order alignment, the vertical scroll bar (if present) is to the left of the client area. For other languages, the style is ignored. |
| The window text is displayed using left-to-right reading-order properties. This is the default. |
| The window is a MDI child window. |
| A top-level window created with this style does not become the foreground window when the user clicks it. The system does not bring this window to the foreground when the user minimizes or closes the foreground window. To activate the window, use the SetActiveWindow or SetForegroundWindow function. The window does not appear on the taskbar by default. To force the window to appear on the taskbar, use theWS_EX_APPWINDOW style. |
| The window does not pass its window layout to its child windows. |
| The child window created with this style does not send the WM_PARENTNOTIFY message to its parent window when it is created or destroyed. |
| The window does not render to a redirection surface. This is for windows that do not have visible content or that use mechanisms other than surfaces to provide their visual. |
| The window is an overlapped window. |
| The window is palette window, which is a modeless dialog box that presents an array of commands. |
| The window has generic "right-aligned" properties. This depends on the window class. This style has an effect only if the shell language is Hebrew, Arabic, or another language that supports reading-order alignment; otherwise, the style is ignored. Using the WS_EX_RIGHT style for static or edit controls has the same effect as using theSS_RIGHT orES_RIGHT style, respectively. Using this style with button controls has the same effect as usingBS_RIGHT andBS_RIGHTBUTTON styles. |
| The vertical scroll bar (if present) is to the right of the client area. This is the default. |
| If the shell language is Hebrew, Arabic, or another language that supports reading-order alignment, the window text is displayed using right-to-left reading-order properties. For other languages, the style is ignored. |
| The window has a three-dimensional border style intended to be used for items that do not accept user input. |
| The window is intended to be used as a floating toolbar. A tool window has a title bar that is shorter than a normal title bar, and the window title is drawn using a smaller font. A tool window does not appear in the taskbar or in the dialog that appears when the user presses ALT+TAB. If a tool window has a system menu, its icon is not displayed on the title bar. However, you can display the system menu by right-clicking or by typing ALT+SPACE. |
| The window should be placed above all non-topmost windows and should stay above them, even when the window is deactivated. To add or remove this style, use theSetWindowPos function. |
| The window should not be painted until siblings beneath the window (that were created by the same thread) have been painted. The window appears transparent because the bits of underlying sibling windows have already been painted. To achieve transparency without these restrictions, use the SetWindowRgn function. |
| The window has a border with a raised edge. |
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