本文介紹在 C# 中使用 ThoughtWorks.QRCode.dll 生成指定尺寸和邊框寬度的二維碼。網上文章大多只是簡單介紹內置參數的設置，根據我的使用目的，增加了自定義目標二維碼圖片尺寸和白邊邊框。有需要的朋友們可以試一下，如有bug歡迎指正。

?首先，將 ThoughtWorks.QRCode.dll 放在 bin 目錄后，在頁面中引用：

using?ThoughtWorks.QRCode.Codec; 生成二維碼圖片：

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/// <summary> /// 生成二維碼 /// </summary> /// <param name="Content">內容文本</param> /// <param name="QRCodeEncodeMode">二維碼編碼方式</param> /// <param name="QRCodeErrorCorrect">糾錯碼等級</param> /// <param name="QRCodeVersion">二維碼版本號 0-40</param> /// <param name="QRCodeScale">每個小方格的預設寬度(像素)，正整數</param> /// <param name="size">圖片尺寸(像素)，0表示不設置</param> /// <param name="border">圖片白邊(像素)，當size大于0時有效</param> /// <returns></returns> public?System.Drawing.Image CreateQRCode(string?Content, QRCodeEncoder.ENCODE_MODE QRCodeEncodeMode, QRCodeEncoder.ERROR_CORRECTION QRCodeErrorCorrect,?int?QRCodeVersion,?int?QRCodeScale,?int?size,?int?border) { ????QRCodeEncoder qrCodeEncoder =?new?QRCodeEncoder(); ????qrCodeEncoder.QRCodeEncodeMode = QRCodeEncodeMode; ????qrCodeEncoder.QRCodeErrorCorrect = QRCodeErrorCorrect; ????qrCodeEncoder.QRCodeScale = QRCodeScale; ????qrCodeEncoder.QRCodeVersion = QRCodeVersion; ????System.Drawing.Image image = qrCodeEncoder.Encode(Content); ????#region 根據設定的目標圖片尺寸調整二維碼QRCodeScale設置，并添加邊框 ????if?(size > 0) ????{ ????????//當設定目標圖片尺寸大于生成的尺寸時，逐步增大方格尺寸 ????????#region 當設定目標圖片尺寸大于生成的尺寸時，逐步增大方格尺寸 ????????while?(image.Width < size) ????????{ ????????????qrCodeEncoder.QRCodeScale++; ????????????System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content); ????????????if?(imageNew.Width < size) ????????????{ ????????????????image =?new?System.Drawing.Bitmap(imageNew); ????????????????imageNew.Dispose(); ????????????????imageNew =?null; ????????????} ????????????else ????????????{ ????????????????qrCodeEncoder.QRCodeScale--;?//新尺寸未采用，恢復最終使用的尺寸 ????????????????imageNew.Dispose(); ????????????????imageNew =?null; ????????????????break; ????????????} ????????} ????????#endregion ????????//當設定目標圖片尺寸小于生成的尺寸時，逐步減小方格尺寸 ????????#region 當設定目標圖片尺寸小于生成的尺寸時，逐步減小方格尺寸 ????????while?(image.Width > size && qrCodeEncoder.QRCodeScale > 1) ????????{ ????????????qrCodeEncoder.QRCodeScale--; ????????????System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content); ????????????image =?new?System.Drawing.Bitmap(imageNew); ????????????imageNew.Dispose(); ????????????imageNew =?null; ????????????if?(image.Width < size) ????????????{ ????????????????break; ????????????} ????????} ????????#endregion ????????//如果目標尺寸大于生成的圖片尺寸，則為圖片增加白邊 ????????#region 如果目標尺寸大于生成的圖片尺寸，則為圖片增加白邊 ????????if?(image.Width <= size) ????????{ ????????????//根據參數設置二維碼圖片白邊的最小寬度 ????????????#region 根據參數設置二維碼圖片白邊的最小寬度 ????????????if?(border > 0) ????????????{ ????????????????while?(image.Width <= size && size - image.Width < border * 2 && qrCodeEncoder.QRCodeScale > 1) ????????????????{ ????????????????????qrCodeEncoder.QRCodeScale--; ????????????????????System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content); ????????????????????image =?new?System.Drawing.Bitmap(imageNew); ????????????????????imageNew.Dispose(); ????????????????????imageNew =?null; ????????????????} ????????????} ????????????#endregion ????????????//當目標圖片尺寸大于二維碼尺寸時，將二維碼繪制在目標尺寸白色畫布的中心位置 ????????????if?(image.Width < size) ????????????{ ????????????????//新建空白繪圖 ????????????????System.Drawing.Bitmap panel =?new?System.Drawing.Bitmap(size, size); ????????????????System.Drawing.Graphics graphic0 = System.Drawing.Graphics.FromImage(panel); ????????????????int?p_left = 0; ????????????????int?p_top = 0; ????????????????if?(image.Width <= size)?//如果原圖比目標形狀寬 ????????????????{ ????????????????????p_left = (size - image.Width) / 2; ????????????????} ????????????????if?(image.Height <= size) ????????????????{ ????????????????????p_top = (size - image.Height) / 2; ????????????????} ????????????????//將生成的二維碼圖像粘貼至繪圖的中心位置 ????????????????graphic0.DrawImage(image, p_left, p_top, image.Width, image.Height); ????????????????image =?new?System.Drawing.Bitmap(panel); ????????????????panel.Dispose(); ????????????????panel =?null; ????????????????graphic0.Dispose(); ????????????????graphic0 =?null; ????????????} ????????} ????????#endregion ????} ????#endregion ????return?image; } private?static?bool?IsTrue()?// 在Image類別對圖片進行縮放的時候,需要一個返回bool類別的委托 { ????return?true; }

?在aspx頁面調用和輸出為圖片流：

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string?content =?string.IsNullOrEmpty(Request.QueryString["txt"]) ??"http://www.lenashane.com/"?: Request.QueryString["txt"]; int?size = Convert.ToInt32(string.IsNullOrEmpty(Request.QueryString["size"]) ??"200"?: Request.QueryString["size"]); int?border = Convert.ToInt32(string.IsNullOrEmpty(Request.QueryString["border"]) ??"10"?: Request.QueryString["border"]); System.Drawing.Image image = CreateQRCode(content, ????QRCodeEncoder.ENCODE_MODE.BYTE, ????QRCodeEncoder.ERROR_CORRECTION.M, ????0, ????5, ????size, ????border); //將圖片輸出到頁面 System.IO.MemoryStream ms =?new?System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Png); HttpContext.Current.Response.ClearContent(); HttpContext.Current.Response.ContentType =?"image/Png"; HttpContext.Current.Response.OutputStream.Write(ms.ToArray(), 0, ms.ToArray().Length); HttpContext.Current.Response.End(); ms.Close(); ms =?null; image.Dispose(); image =?null;

生成二維碼方法，增加定位點著色參數(System.Drawing.Color)，效果如下：

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/// <summary> /// 生成二維碼 /// </summary> /// <param name="Content">內容文本</param> /// <param name="QRCodeEncodeMode">二維碼編碼方式</param> /// <param name="QRCodeErrorCorrect">糾錯碼等級</param> /// <param name="QRCodeVersion">二維碼版本號 0-40</param> /// <param name="QRCodeScale">每個小方格的預設寬度(像素)，正整數</param> /// <param name="size">圖片尺寸(像素)，0表示不設置</param> /// <param name="border">圖片白邊(像素)，當size大于0時有效</param> /// <returns></returns> public?System.Drawing.Image CreateQRCode(string?Content, QRCodeEncoder.ENCODE_MODE QRCodeEncodeMode, QRCodeEncoder.ERROR_CORRECTION QRCodeErrorCorrect,?int?QRCodeVersion,?int?QRCodeScale,?int?size,?int?border, Color codeEyeColor) { ????QRCodeEncoder qrCodeEncoder =?new?QRCodeEncoder(); ????qrCodeEncoder.QRCodeEncodeMode = QRCodeEncodeMode; ????qrCodeEncoder.QRCodeErrorCorrect = QRCodeErrorCorrect; ????qrCodeEncoder.QRCodeScale = QRCodeScale; ????qrCodeEncoder.QRCodeVersion = QRCodeVersion; ????System.Drawing.Image image = qrCodeEncoder.Encode(Content); ????#region 根據設定的目標圖片尺寸調整二維碼QRCodeScale設置，并添加邊框 ????if?(size > 0) ????{ ????????//當設定目標圖片尺寸大于生成的尺寸時，逐步增大方格尺寸 ????????#region 當設定目標圖片尺寸大于生成的尺寸時，逐步增大方格尺寸 ????????while?(image.Width < size) ????????{ ????????????qrCodeEncoder.QRCodeScale++; ????????????System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content); ????????????if?(imageNew.Width < size) ????????????{ ????????????????image =?new?System.Drawing.Bitmap(imageNew); ????????????????imageNew.Dispose(); ????????????????imageNew =?null; ????????????} ????????????else ????????????{ ????????????????qrCodeEncoder.QRCodeScale--;?//新尺寸未采用，恢復最終使用的尺寸 ????????????????imageNew.Dispose(); ????????????????imageNew =?null; ????????????????break; ????????????} ????????} ????????#endregion ????????//當設定目標圖片尺寸小于生成的尺寸時，逐步減小方格尺寸 ????????#region 當設定目標圖片尺寸小于生成的尺寸時，逐步減小方格尺寸 ????????while?(image.Width > size && qrCodeEncoder.QRCodeScale > 1) ????????{ ????????????qrCodeEncoder.QRCodeScale--; ????????????System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content); ????????????image =?new?System.Drawing.Bitmap(imageNew); ????????????imageNew.Dispose(); ????????????imageNew =?null; ????????????if?(image.Width < size) ????????????{ ????????????????break; ????????????} ????????} ????????#endregion ????????//根據參數設置二維碼圖片白邊的最小寬度(按需縮小) ????????#region 根據參數設置二維碼圖片白邊的最小寬度 ????????if?(image.Width <= size && border > 0) ????????{ ????????????while?(image.Width <= size && size - image.Width < border * 2 && qrCodeEncoder.QRCodeScale > 1) ????????????{ ????????????????qrCodeEncoder.QRCodeScale--; ????????????????System.Drawing.Image imageNew = qrCodeEncoder.Encode(Content); ????????????????image =?new?System.Drawing.Bitmap(imageNew); ????????????????imageNew.Dispose(); ????????????????imageNew =?null; ????????????} ????????} ????????#endregion ????????//已經確認二維碼圖像，為圖像染色修飾 ????????if?(true) ????????{ ????????????//定位點方塊邊長 ????????????int?beSize = qrCodeEncoder.QRCodeScale * 3; ????????????int?bep1_l = qrCodeEncoder.QRCodeScale * 2; ????????????int?bep1_t = qrCodeEncoder.QRCodeScale * 2; ????????????int?bep2_l = image.Width - qrCodeEncoder.QRCodeScale * 5 - 1; ????????????int?bep2_t = qrCodeEncoder.QRCodeScale * 2; ????????????int?bep3_l = qrCodeEncoder.QRCodeScale * 2; ????????????int?bep3_t = image.Height - qrCodeEncoder.QRCodeScale * 5 - 1; ????????????int?bep4_l = image.Width - qrCodeEncoder.QRCodeScale * 7 - 1; ????????????int?bep4_t = image.Height - qrCodeEncoder.QRCodeScale * 7 - 1; ????????????System.Drawing.Graphics graphic0 = System.Drawing.Graphics.FromImage(image); ????????????// Create solid brush. ????????????SolidBrush blueBrush =?new?SolidBrush(codeEyeColor); ????????????// Fill rectangle to screen. ????????????graphic0.FillRectangle(blueBrush, bep1_l, bep1_t, beSize, beSize); ????????????graphic0.FillRectangle(blueBrush, bep2_l, bep2_t, beSize, beSize); ????????????graphic0.FillRectangle(blueBrush, bep3_l, bep3_t, beSize, beSize); ????????????graphic0.FillRectangle(blueBrush, bep4_l, bep4_t, qrCodeEncoder.QRCodeScale, qrCodeEncoder.QRCodeScale); ????????} ????????//當目標圖片尺寸大于二維碼尺寸時，將二維碼繪制在目標尺寸白色畫布的中心位置 ????????#region 如果目標尺寸大于生成的圖片尺寸，將二維碼繪制在目標尺寸白色畫布的中心位置 ????????if?(image.Width < size) ????????{ ????????????//新建空白繪圖 ????????????System.Drawing.Bitmap panel =?new?System.Drawing.Bitmap(size, size); ????????????System.Drawing.Graphics graphic0 = System.Drawing.Graphics.FromImage(panel); ????????????int?p_left = 0; ????????????int?p_top = 0; ????????????if?(image.Width <= size)?//如果原圖比目標形狀寬 ????????????{ ????????????????p_left = (size - image.Width) / 2; ????????????} ????????????if?(image.Height <= size) ????????????{ ????????????????p_top = (size - image.Height) / 2; ????????????} ????????????//將生成的二維碼圖像粘貼至繪圖的中心位置 ????????????graphic0.DrawImage(image, p_left, p_top, image.Width, image.Height); ????????????image =?new?System.Drawing.Bitmap(panel); ????????????panel.Dispose(); ????????????panel =?null; ????????????graphic0.Dispose(); ????????????graphic0 =?null; ????????} ????????#endregion ????} ????#endregion ????return?image; }

總結

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