笔记（RemoveAll；DataGridView用linq查询；动态添加控件时闪烁问题）

2.DataGridView用linq查询

IEnumerable<DataGridViewRow> emplist = this.dataGridEmp.Rows.Cast<DataGridViewRow>();//扩展方法，转换类型
var query = emplist.Max(s => s.Cells[1].Value);//查询第二列的最大值

3.动态添加控件时闪烁问题
将以下代码加在窗体里

        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cp = base.CreateParams;
                cp.ExStyle |= 0x02000000;
                return cp;
            }
        }

CreateParams.Style的参数链接为：
https://msdn.microsoft.com/zh-cn/library/czada357.aspx

WS_OVERLAPPED       = 0;                {重叠式窗口, 应带标题栏和边框}
WS_POPUP            = DWORD($80000000); {弹出式窗口, 不能与 WS_CHILD 一起使用}
WS_CHILD            = $40000000;        {子窗口, 不能与 WS_POPUP 一起使用}
WS_MINIMIZE         = $20000000;        {最小化窗口}
WS_VISIBLE          = $10000000;        {初始时可见}
WS_DISABLED         = $8000000;         {禁止输入}
WS_CLIPSIBLINGS     = $4000000;         {裁剪子窗口, 也就是子窗口重绘不影响重叠的其他子窗口, 应与 WS_CHILD 一起使用}
WS_CLIPCHILDREN     = $2000000;         {在父窗口中绘图时绕开子窗口区域, 创建父窗口是使用}
WS_MAXIMIZE         = $1000000;         {最大化窗口}
WS_CAPTION          = $C00000;          {有标题栏}
WS_BORDER           = $800000;          {有细线边框}
WS_DLGFRAME         = $400000;          {对话框窗口}
WS_VSCROLL          = $200000;          {有垂直滚动条}
WS_HSCROLL          = $100000;          {有水平滚动条}
WS_SYSMENU          = $80000;           {带系统标题栏, 须同时指定 WS_CAPTION}
WS_THICKFRAME       = $40000;           {带宽边框, 宽边框用于改变窗口大小}
WS_GROUP            = $20000;           {能用方向键转移焦点}
WS_TABSTOP          = $10000;           {能用 TAB 转移焦点}
WS_MINIMIZEBOX      = $20000;           {有最小化按钮}
WS_MAXIMIZEBOX      = $10000;           {有最大化按钮}
WS_TILED            = WS_OVERLAPPED;
WS_ICONIC           = WS_MINIMIZE;
WS_SIZEBOX          = WS_THICKFRAME;
WS_OVERLAPPEDWINDOW = (WS_OVERLAPPED or WS_CAPTION or WS_SYSMENU or WS_THICKFRAME or WS_MINIMIZEBOX or WS_MAXIMIZEBOX);
WS_TILEDWINDOW      = WS_OVERLAPPEDWINDOW;
WS_POPUPWINDOW      = (WS_POPUP or WS_BORDER or WS_SYSMENU);
WS_CHILDWINDOW      = (WS_CHILD);

WS_EX_DLGMODALFRAME    = 1;      {指定双边界窗口; 藉此指定 WS_CAPTION 创建标题栏}
WS_EX_NOPARENTNOTIFY   = 4;      {在窗口创建或取消时不向父窗口发送 WM_PARENTNOTIFY 消息}
WS_EX_TOPMOST          = 8;      {在所有非最顶层窗口的上面}
WS_EX_ACCEPTFILES      = $10;    {可接受拖放文件}
WS_EX_TRANSPARENT      = $20;    {透明样式, 在同属窗口已重画时该窗口才可重画}
WS_EX_MDICHILD         = $40;    {创建一个 MDI 子窗口}
WS_EX_TOOLWINDOW       = $80;    {工具窗口}
WS_EX_WINDOWEDGE       = $100;   {带立体的边框}
WS_EX_CLIENTEDGE       = $200;   {带阴影的边界}
WS_EX_CONTEXTHELP      = $400;   {标题包含一个问号标志, 不能与 WS_MAXIMIZEBOX 和 WS_MINIMIZEBOX 同时使用}
WS_EX_RIGHT            = $1000;  {窗口具有右对齐属性}
WS_EX_LEFT             = 0;      {窗口具有左对齐属性, WS_EX_LEFT 是缺省设置}
WS_EX_RTLREADING       = $2000;  {窗口文本从右到左}
WS_EX_LTRREADING       = 0;      {窗口文本从左到右, WS_EX_LTRREADING 是缺省设置}
WS_EX_LEFTSCROLLBAR    = $4000;  {垂直滚动条在左边界, 只用于特殊语言环境}
WS_EX_RIGHTSCROLLBAR   = 0;      {垂直滚动条在右边界, WS_EX_RIGHTSCROLLBAR 是缺省设置}
WS_EX_CONTROLPARENT    = $10000; {允许用户使用 Tab 键在窗口的子窗口间搜索}
WS_EX_STATICEDGE       = $20000; {窗口不可用时创建一个三维边界}
WS_EX_APPWINDOW        = $40000; {当窗口可见时, 将一个顶层窗口放置到任务条上}
WS_EX_OVERLAPPEDWINDOW = (WS_EX_WINDOWEDGE or WS_EX_CLIENTEDGE); {立体边框并带阴影}
WS_EX_PALETTEWINDOW    = (WS_EX_WINDOWEDGE or WS_EX_TOOLWINDOW or WS_EX_TOPMOST); {立体边框、工具条窗口样式、在顶层}
WS_EX_LAYERED          = $00080000; {分层或透明窗口, 该样式可使用混合特效}
WS_EX_NOINHERITLAYOUT  = $00100000; {子窗口不继承父窗口的布局}
WS_EX_LAYOUTRTL        = $00400000; {从右到左的布局}
WS_EX_COMPOSITED       = $02000000; {用双缓冲从下到上绘制窗口的所有子孙}
WS_EX_NOACTIVATE       = $08000000; {处于顶层但不激活}

笔记（RemoveAll；DataGridView用linq查询；动态添加控件时闪烁问题）

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