????現在，C#創建不規則窗體不是一件難事，下面總結一下:

????? 一、自定義窗體，一般為規則的圖形，如圓、橢圓等。

做法：重寫Form1_Paint事件（Form1是窗體的名字），最簡單的一種情況如下：

System.Drawing.Drawing2D.GraphicsPath shape = new System.Drawing.Drawing2D.GraphicsPath();

shape.AddEllipse(0,0,this.Height, this.Width);

this.Region = new Region(shape);

即重繪窗體的規則。

??? 二、利用背景圖片實現

????? 1.?????? 設置窗體的背景圖片，其中背景圖片是24位（不包括24）以下的位圖（BMP圖片），并且要設置TansparencyKey的值，一般為你背景圖片的背景色，即創建不規則圖片時的底色，一般設為你圖片中沒有的顏色。

??? 這種做法的不好的地方就是背景圖片一定要16位或者更低的，而且還要確保客戶端的顯示。如果監視器的顏色深度設置大于 24 位，則不管 TransparencyKey 屬性是如何設置的，窗體的非透明部分都會產生顯示問題。若要避免出現這種問題，請確保“顯示”控制面板中的監視器顏色深度的設置小于 24 位。當開發具有這種透明功能的應用程序時，請牢記應使您的用戶意識到此問題。

???? 實現步驟如下：

1．?新建windows application

2．?選擇窗體，找到BackgroundImage屬性，點擊打開新的窗口，選擇下面的導入資源文件，選擇你的不規則的BMP圖片

3．?找到窗體的TansparencyKey，將它設置為你背景圖片的背景色（如黃色）

4．?找到窗體的FormBorderStyle，將其設置為none，即不顯示標題欄

5．?運行

????? 2.?????? 跟背景圖片一樣的圖形，不過是動態加載，遍歷位圖以實現不規則窗體。它的原理是這樣的，在Form的load事件中寫方法使得窗體的描繪區域發生改變。

??? 實現步驟如下：

1．?建立winform應用程序

2．?找到窗體的Load事件，雙擊進行編輯

3．?編寫方法，主要的代碼如下：

?

代碼
????class?BitmapRegion
????{
????????public?BitmapRegion()
????????{?}


????????///?<summary>?
????????///?Create?and?apply?the?region?on?the?supplied?control
????????///?創建支持位圖區域的控件（目前有button和form）
????????///?</summary>?
????????///?<param?name="control">The?Control?object?to?apply?the?region?to控件</param>?
????????///?<param?name="bitmap">The?Bitmap?object?to?create?the?region?from位圖</param>?
????????public?static?void?CreateControlRegion(Control?control,?Bitmap?bitmap)
????????{
????????????//?Return?if?control?and?bitmap?are?null
????????????//判斷是否存在控件和位圖
????????????if?(control?==?null?||?bitmap?==?null)
????????????????return;

????????????//?Set?our?control''s?size?to?be?the?same?as?the?bitmap
????????????//設置控件大小為位圖大小
????????????control.Width?=?bitmap.Width;
????????????control.Height?=?bitmap.Height;
????????????//?Check?if?we?are?dealing?with?Form?here?
????????????//當控件是form時
????????????if?(control?is?System.Windows.Forms.Form)
????????????{
????????????????//?Cast?to?a?Form?object
????????????????//強制轉換為FORM
????????????????Form?form?=?(Form)control;
????????????????//?Set?our?form''s?size?to?be?a?little?larger?that?the??bitmap?just?
????????????????//?in?case?the?form''s?border?style?is?not?set?to?none?in?the?first?place?
????????????????//當FORM的邊界FormBorderStyle不為NONE時，應將FORM的大小設置成比位圖大小稍大一點
????????????????form.Width?=?control.Width;
????????????????form.Height?=?control.Height;
????????????????//?No?border?
????????????????//沒有邊界
????????????????form.FormBorderStyle?=?FormBorderStyle.None;
????????????????//?Set?bitmap?as?the?background?image?
????????????????//將位圖設置成窗體背景圖片
????????????????form.BackgroundImage?=?bitmap;
????????????????//?Calculate?the?graphics?path?based?on?the?bitmap?supplied?
????????????????//計算位圖中不透明部分的邊界
????????????????GraphicsPath?graphicsPath?=?CalculateControlGraphicsPath(bitmap);
????????????????//?Apply?new?region?
????????????????//應用新的區域
????????????????form.Region?=?new?Region(graphicsPath);
????????????}
????????????//?Check?if?we?are?dealing?with?Button?here?
????????????//當控件是button時
????????????else?if?(control?is?System.Windows.Forms.Button)
????????????{
????????????????//?Cast?to?a?button?object?
????????????????//強制轉換為?button
????????????????Button?button?=?(Button)control;
????????????????//?Do?not?show?button?text?
????????????????//不顯示button?text
????????????????button.Text?=?"";

????????????????//?Change?cursor?to?hand?when?over?button?
????????????????//改變?cursor的style
????????????????button.Cursor?=?Cursors.Hand;
????????????????//?Set?background?image?of?button?
????????????????//設置button的背景圖片
????????????????button.BackgroundImage?=?bitmap;

????????????????//?Calculate?the?graphics?path?based?on?the?bitmap?supplied?
????????????????//計算位圖中不透明部分的邊界
????????????????GraphicsPath?graphicsPath?=?CalculateControlGraphicsPath(bitmap);
????????????????//?Apply?new?region?
????????????????//應用新的區域
????????????????button.Region?=?new?Region(graphicsPath);
????????????}
????????}
????????///?<summary>?
????????///?Calculate?the?graphics?path?that?representing?the?figure?in?the?bitmap?
????????///?excluding?the?transparent?color?which?is?the?top?left?pixel.?
????????///?//計算位圖中不透明部分的邊界
????????///?</summary>?
????????///?<param?name="bitmap">The?Bitmap?object?to?calculate?our?graphics?path?from</param>?
????????///?<returns>Calculated?graphics?path</returns>?
????????private?static?GraphicsPath?CalculateControlGraphicsPath(Bitmap?bitmap)
????????{
????????????//?Create?GraphicsPath?for?our?bitmap?calculation?
????????????//創建?GraphicsPath
????????????GraphicsPath?graphicsPath?=?new?GraphicsPath();
????????????//?Use?the?top?left?pixel?as?our?transparent?color?
????????????//使用左上角的一點的顏色作為我們透明色
????????????Color?colorTransparent?=?bitmap.GetPixel(0,?0);
????????????//?This?is?to?store?the?column?value?where?an?opaque?pixel?is?first?found.?
????????????//?This?value?will?determine?where?we?start?scanning?for?trailing?opaque?pixels.
????????????//第一個找到點的X
????????????int?colOpaquePixel?=?0;
????????????//?Go?through?all?rows?(Y?axis)?
????????????//?偏歷所有行（Y方向）
????????????for?(int?row?=?0;?row?<?bitmap.Height;?row++)
????????????{
????????????????//?Reset?value?
????????????????//重設
????????????????colOpaquePixel?=?0;
????????????????//?Go?through?all?columns?(X?axis)?
????????????????//偏歷所有列（X方向）
????????????????for?(int?col?=?0;?col?<?bitmap.Width;?col++)
????????????????{
????????????????????//?If?this?is?an?opaque?pixel,?mark?it?and?search?for?anymore?trailing?behind?
????????????????????//如果是不需要透明處理的點則標記，然后繼續偏歷
????????????????????if?(bitmap.GetPixel(col,?row)?!=?colorTransparent)
????????????????????{
????????????????????????//?Opaque?pixel?found,?mark?current?position
????????????????????????//記錄當前
????????????????????????colOpaquePixel?=?col;
????????????????????????//?Create?another?variable?to?set?the?current?pixel?position?
????????????????????????//建立新變量來記錄當前點
????????????????????????int?colNext?=?col;
????????????????????????//?Starting?from?current?found?opaque?pixel,?search?for?anymore?opaque?pixels?
????????????????????????//?trailing?behind,?until?a?transparent???pixel?is?found?or?minimum?width?is?reached?
????????????????????????///從找到的不透明點開始，繼續尋找不透明點,一直到找到或則達到圖片寬度?
????????????????????????for?(colNext?=?colOpaquePixel;?colNext?<?bitmap.Width;?colNext++)
????????????????????????????if?(bitmap.GetPixel(colNext,?row)?==?colorTransparent)
????????????????????????????????break;
????????????????????????//?Form?a?rectangle?for?line?of?opaque???pixels?found?and?add?it?to?our?graphics?path?
????????????????????????//將不透明點加到graphics?path
????????????????????????graphicsPath.AddRectangle(new?Rectangle(colOpaquePixel,?row,?colNext?-?colOpaquePixel,?1));
????????????????????????//?No?need?to?scan?the?line?of?opaque?pixels?just?found?
????????????????????????col?=?colNext;
????????????????????}
????????????????}
????????????}
????????????//?Return?calculated?graphics?path?
????????????return?graphicsPath;
????????}
????}

?

?????? 4．?運行

?????? 三、調用類庫實現

主要就是根據一些坐標，然后根據這些坐標繪制窗體

代碼如下：

?

代碼 public?Form3()

????????{

????????????InitializeComponent();

????????????//創建不規則窗體

????????????POINTAPI[]?poin;

????????????poin?=?new?POINTAPI[5];

????????????poin[0].x?=?90;

????????????poin[0].y?=?90;

????????????poin[1].x?=?this.Width;

????????????poin[1].y?=?0;

????????????poin[2].x?=?Width;

????????????poin[2].y?=?this.Height?/?2;

????????????poin[3].x?=?Width?/?2;

????????????poin[3].y?=?Height?/?2;

????????????poin[4].x?=?0;

????????????poin[4].y?=?Width;

?

????????????Boolean?flag?=?true;

????????????IntPtr?hRgn?=?CreatePolygonRgn(ref?poin[0],?8,?1);

????????????SetWindowRgn(this.Handle,?hRgn,?ref?flag);

????????????this.BackColor?=?Color.BurlyWood;

????????}

?

????????[StructLayout(LayoutKind.Sequential)]

????????private?struct?POINTAPI

????????{

????????????internal?int?x;

????????????internal?int?y;

????????}

?

????????[DllImport("gdi32.dll")]

????????private?static?extern?IntPtr?CreatePolygonRgn(ref?POINTAPI?lpPoint,int?nCount,int?nPolyFillMode);

?

????????[DllImport("user32.dll")]

????????private?static?extern?IntPtr?SetWindowRgn(IntPtr?hWnd,IntPtr?hRgn,?ref?Boolean?bRedraw);

?

????????//設置窗體顯示狀態

????????[DllImport("user32.dll")]

????????private?static?extern?int?SetWindowPos(IntPtr?hwnd,int?hWndInsertAfter,int?x,int?y,int?cx,int?cy,int?wFlags);

?

????????private?void?Start_Btn_Click(object?sender,?EventArgs?e)

????????{//始終顯示在前面

?

????????????SetWindowPos(this.Handle,?-1,?0,?0,?0,?0,?1);

????????}

?

????????private?void?button1_Click(object?sender,?EventArgs?e)

????????{

????????????//最小化始終顯示在前面

????????????SetWindowPos(this.Handle,?-1,?0,?0,?0,?0,?0);

?

????????}

????? 當然，我們也可以自定義窗體的動作，如按著某個軌跡一定，下面的代碼中的BackgroundForm程序中就小試了一下，效果還不錯，下面是這些程序的效果圖（有點亂）和代碼：

?

?

????? 代碼下載： 不規則窗體

????? 代碼是.Net 2.0的，也可以轉換為其他版本的，只要運行主程序即可。（PS：圖片做的不是很好看，就隨便亂P了一通）

????? 以上的四種方法有利也有弊，希望大家提意見或者更好的解決方案。

轉載于:https://www.cnblogs.com/waw/archive/2011/09/02/2163187.html

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