c# winform 解決PictureBox 沒法打印所有圖片的問題

1、   問題描述

在頁面使用PictureBox 加載資料圖片後，點擊「打印」，只能打印圖片首頁，較大圖片則沒法所有打印。

2、   緣由分析

PictureBox中打印圖片時沒有設置繼續打印相關屬性，所以每次只能打印第1頁。

3、解決方法

PictureBox控件增長打印所有頁面屬性，若是爲True,表示打印所有頁面；若是爲False,保留原有邏輯不變。

在打印所有頁面時，將控件的圖片按頁面大小切割，打印頁面索引小於頁面總數時，設置打印屬性PrintPageEventArgs. HasMorePages = true繼續打印，打印完成後將該屬性設置爲False結束打印。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Printing;
using System.Text;
using System.Windows.Forms;

namespace MyClass
{

    //public enum OperationState { Default, ZoomIn, ZoomOut };

    public partial class UCPictureBox : PictureBox
    {
        //private OperationState operationState;//處理狀態
        private HScrollBar hScrollBar;//水平滾動條
        private VScrollBar vScrollBar;//垂直滾動條
        private PrintDocument printDocument;//打印對象
        private Rectangle currRect;//如今矩形對象
        private Bitmap currBmp;//如今圖形對象
        //private int hScrollBarMidVal;//水平滾動條中間值
        //private int vScrollBarMidVal;//垂直滾動條中間值
        private RectangleF srcRect;
        private RectangleF destRect;
        private bool isMoveScrollBar;//是否移動滾動條        
        int currentPageIndex = 0;//當前頁面
        int pageCount = 0;//打印頁數
        
        /// <summary>
        /// 構造函數
        /// </summary>
        public UCPictureBox()
        {
            InitializeComponent();
            SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
            SetStyle(ControlStyles.AllPaintingInWmPaint, true);

            //hScrollBarMidVal = 0;
            //vScrollBarMidVal = 0;            
            //operationState = OperationState.Default;
            isMoveScrollBar = false;
            srcRect = new RectangleF();
            destRect = new RectangleF();
            printDocument = new PrintDocument();
            printDocument.PrintPage += new PrintPageEventHandler(printDocument_PrintPage);

            //構造水平滾動條
            hScrollBar = new HScrollBar();
            hScrollBar.Visible = false;
            hScrollBar.Dock = DockStyle.Bottom;
            hScrollBar.Scroll += new ScrollEventHandler(scrollBar_Scroll);
            this.Controls.Add(hScrollBar);

            //構造垂直滾動條
            vScrollBar = new VScrollBar();
            vScrollBar.Visible = false;
            vScrollBar.Dock = DockStyle.Right;
            vScrollBar.Scroll +=new ScrollEventHandler(scrollBar_Scroll);
            this.Controls.Add(vScrollBar);
        }

        #region 公共屬性

        [Category("外觀"), Description("獲取或設置圖片")]
        public new Image Image
        {
            get { return base.Image; }
            set
            {
                if (value != null)
                {
                    base.Image = value;
                    currRect.Width = base.Image.Width;
                    currRect.Height = base.Image.Height;
                    hScrollBar.Value = 0;
                    vScrollBar.Value = 0;
                    displayScrollBars();
                    setScrollBarsValues();
                    Invalidate();
                }
            }
        }

        //縮放比例
        private int scaleSize = 1;
        [Category("其它"), Description("獲取或設置圖片縮放比例")]
        public Int32 ScaleSize
        {
            get { return scaleSize; }
            set
            {
                if (value > 1 && value < 51)
                {
                    scaleSize = value;
                }
            }
        }

        //縮放倍數
        private int scaleScope = 5;
        [Category("其它"), Description("獲取或設置圖片最大縮放倍數")]
        public int ScaleScope
        {
            get { return scaleScope; }
            set
            {
                if (value > 1 && value < 11)
                {
                    scaleScope = value;
                }
            }
        }

        //圖片邊框顏色
        //private Color borderColor = Color.DarkGray;
        //[Category("其它"), Description("獲取或設置圖片邊框顏色")]
        //public Color BorderColor
        //{
        //    get { return borderColor; }
        //    set { borderColor = value; }
        //}

        //圖片邊框寬度
        private int borderWidth = 5;
        [Category("其它"), Description("獲取或設置圖片邊框寬度")]
        public Int32 BorderWidth
        {
            get { return borderWidth; }
            set { borderWidth = value; }
        }

        //打印所有頁面
        [Category("其它"),Description("true-打印所有頁面，false-打印首頁")]
        public bool PrintAllPages { get; set; }

        #endregion

        #region 內部公共方法

        /// <summary>
        /// 重新繪製
        /// </summary>
        protected override void OnPaint(PaintEventArgs pe)
        {
            // TODO: 在此處添加自定義繪製代碼
            // 調用基類 OnPaint
            base.OnPaint(pe);

            if (this.Image != null)
            {
                if (currBmp != null) { currBmp.Dispose(); }
                currBmp = new Bitmap(currRect.Width + 2 * borderWidth, currRect.Height + 2 * borderWidth);
                //繪製新圖片
                using (Graphics g = Graphics.FromImage(currBmp))
                {
                    using (Pen pen = new Pen(BackColor, borderWidth))
                    {
                        g.DrawRectangle(pen, borderWidth * 0.5f, borderWidth * 0.5f,
                                        currRect.Width + borderWidth,
                                        currRect.Height + borderWidth);
                    }
                    g.DrawImage(this.Image, borderWidth, borderWidth, currRect.Width, currRect.Height);
                }

                //圖片繪製到控件上
                pe.Graphics.Clear(BackColor);
                if (hScrollBar.Visible || vScrollBar.Visible)
                {//滾動條可見
                    drawDisplayedScrollBars(pe.Graphics);
                }
                else
                {//滾動條不可見
                    float x = 0, y = 0;
                    isMoveScrollBar = false;

                    //是否繪製到中心點座標
                    if (this.SizeMode == PictureBoxSizeMode.CenterImage)
                    {
                        x = Math.Abs(ClientSize.Width - currBmp.Width) * 0.5f;
                        y = Math.Abs(ClientSize.Height - currBmp.Height) * 0.5f;
                    }
                    pe.Graphics.DrawImage(currBmp, x, y, currBmp.Width, currBmp.Height);
                }
            }
        }

        /// <summary>
        /// 重寫控件大小發生改變事件
        /// </summary>
        protected override void OnClientSizeChanged(EventArgs e)
        {
            base.OnClientSizeChanged(e);
            displayScrollBars();
            setScrollBarsValues();
            Invalidate();
        }

        #endregion

        #region 圖片打印與預覽

        /// <summary>
        /// 打印圖片
        /// </summary>
        public void PrintPictrue()
        {
            PrintDialog printDialog = new PrintDialog();
            printDialog.Document = printDocument;
            //added by lky 2017-11-16 修復Windows 7 x64位環境沒法彈出打印對話框的問題
            printDialog.UseEXDialog = true;
            if (printDialog.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    printDocument.Print();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message, "打印出錯", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    return;
                }
            }
        }

        /// <summary>
        /// 打印預覽
        /// </summary>
        public void PrintPreview()
        {
            PrintPreviewDialog printPreviewDialog = new PrintPreviewDialog();
            printPreviewDialog.Document = printDocument;
            try
            {
                printPreviewDialog.ShowDialog();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "打印出錯", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        /// <summary>
        /// 打印圖片事件
        /// </summary>
        private void printDocument_PrintPage(object sender, PrintPageEventArgs e)
        {
            if (currBmp == null)
                return;
            try
            {
                if (PrintAllPages)//added by lky 2018-1-15 打印所有頁面
                {
                    int pageWith =(int) e.PageSettings.PrintableArea.Width;
                    int pageHeight = (int)e.PageSettings.PrintableArea.Height;
                    int horizontalTimes = (int)Math.Ceiling((decimal)currBmp.Width / pageWith);//水平方向切割頁數
                    int verticalTimes = (int)Math.Ceiling((decimal)currBmp.Height / pageHeight);//垂直方向切割頁數
                    if (pageCount == 0)
                    {
                        pageCount = horizontalTimes * verticalTimes;//總頁數
                        currentPageIndex = 0;
                    }
                    int horizontalCurrentPosition = (currentPageIndex % horizontalTimes);//當前打印的水平偏移頁數
                    int verticalCurrentPosition = (int)Math.Floor((decimal)currentPageIndex / horizontalTimes);//當前打印的垂直偏移頁數
                    int x = horizontalCurrentPosition * pageWith;//水平方向打印偏移位置
                    int y = verticalCurrentPosition * pageHeight;//垂直方向打印偏移位置
                    int leftX = (currBmp.Width - x) > 0 ? (currBmp.Width - x) : 0;//水平方向未打印尺寸
                    int leftY = (currBmp.Height - y) > 0 ? (currBmp.Height - y) : 0;//垂直方向未打印尺寸

                    Bitmap printBmp = (Bitmap)currBmp.Clone(new Rectangle(x, y, (leftX > pageWith ? pageWith : leftX),
                        (leftY > pageHeight ? pageHeight : leftY)), currBmp.PixelFormat); //待打印圖片緩存
                    e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
                    e.Graphics.PixelOffsetMode = PixelOffsetMode.HighSpeed;

                    e.Graphics.DrawImage(printBmp, 0, 0, printBmp.Width, printBmp.Height);
                    printBmp.Dispose();
                    currentPageIndex++;
                    e.HasMorePages = currentPageIndex < pageCount;//是否繼續打印
                    if (!e.HasMorePages) pageCount = 0;//打印頁數置爲0
                }
                else //僅打印首頁
                {
                    Bitmap printBmp = (Bitmap)currBmp.Clone(); 
                    e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
                    e.Graphics.PixelOffsetMode = PixelOffsetMode.HighSpeed;
                    e.Graphics.DrawImage(printBmp, 0, 0, printBmp.Width, printBmp.Height);
                    printBmp.Dispose();
                }
            }
            catch (Exception ex)
            {
                //寫日誌文件
                LogWriter.Write(LOG_CATEGORY.WIN_UI, LOG_LEVEL.ERROR, "UCPicturBox.PrintPage" + ex.ToString());
            }
        }

        #endregion

        #region 圖片放大、縮小、原始大小、全屏顯示、旋轉功能

        /// <summary>
        /// 放大圖片
        /// </summary>
        public void ZoomInPicture()
        {
            if (this.Image != null)
            {
                //operationState = OperationState.ZoomIn;
                double scale = 1 + (scaleSize * 0.01);
                currRect.Width = Convert.ToInt32(currRect.Width * scale);
                currRect.Height = currRect.Width * this.Image.Height / this.Image.Width;
                if (currRect.Width < (this.Image.Width * scaleScope))
                {                    
                    displayScrollBars();
                    setScrollBarsValues();
                    Invalidate();
                }
            }
        }

        /// <summary>
        /// 縮小圖片
        /// </summary>
        public void ZoomOutPicture()
        {
            if (this.Image != null)
            {
                //operationState = OperationState.ZoomOut;
                double scale = 1 - (scaleSize * 0.01);
                currRect.Width = Convert.ToInt32(currRect.Width * scale);
                currRect.Height = currRect.Width * this.Image.Height / this.Image.Width;
                displayScrollBars();
                setScrollBarsValues();
                Invalidate();
            }
        }

        /// <summary>
        /// 原始大小
        /// </summary>
        public void ZoomOriginalPicture()
        {
            if (this.Image != null)
            {
                //operationState = OperationState.Default;
                isMoveScrollBar = false;
                currRect.Width = this.Image.Width;
                currRect.Height = this.Image.Height;
                displayScrollBars();
                setScrollBarsValues();
                Invalidate();
            }
        }

        /// <summary>
        /// 全屏顯示
        /// </summary>
        public void ZoomShowAllPicture()
        {
            if (this.Image != null)
            {
                if (this.Image.Width > this.Image.Height)
                {
                    currRect.Width = ClientSize.Width - 2 * borderWidth;
                    currRect.Height = currRect.Width * this.Image.Height / this.Image.Width;
                    if ((currRect.Height + 2 * borderWidth) > ClientSize.Height)
                    {
                        currRect.Height = ClientSize.Height - 2 * borderWidth;
                        currRect.Width = currRect.Height * this.Image.Width / this.Image.Height;
                    }
                    //if ((currRect.Height + 2 * borderWidth) > ClientSize.Height)
                    //{
                    //    currRect.Width = ClientSize.Width - 2 * borderWidth - vScrollBar.Width;
                    //    currRect.Height = currRect.Width * this.Image.Height / this.Image.Width;
                    //}
                }
                else
                {
                    currRect.Height = ClientSize.Height - 2 * borderWidth;
                    currRect.Width = currRect.Height * this.Image.Width / this.Image.Height;
                    if ((currRect.Width + 2 * borderWidth) > ClientSize.Width)
                    {
                        currRect.Width = ClientSize.Width - 2 * borderWidth;
                        currRect.Height = currRect.Width * this.Image.Width / this.Image.Height;
                    }
                    //if ((currRect.Width + 2 * borderWidth) > ClientSize.Width)
                    //{
                    //    hScrollBar.Value = 0;
                    //    currRect.Height = ClientSize.Height - 2 * borderWidth - hScrollBar.Height;
                    //    currRect.Width = currRect.Height * this.Image.Width / this.Image.Height;
                    //}
                }
                isMoveScrollBar = false;
                displayScrollBars();
                setScrollBarsValues();
                Invalidate();
            }
        }

        /// <summary>
        /// 旋轉圖片
        /// </summary>
        public void RotatePicture()
        {
            if (this.Image != null)
            {
                isMoveScrollBar = false;
                this.Image.RotateFlip(RotateFlipType.Rotate90FlipNone);
                int tempWidth = currRect.Width;
                currRect.Width = currRect.Height;
                currRect.Height = tempWidth;
                displayScrollBars();
                setScrollBarsValues();
                Invalidate();
            }
        }

        /// <summary>
        /// 顯示水平滾動條與垂直滾動條
        /// </summary>
        private void displayScrollBars()
        {
            //是否顯示水平滾動條
            if ((currRect.Width + 2 * borderWidth) > ClientSize.Width)
            { hScrollBar.Visible = true; }
            else
            { hScrollBar.Visible = false; }

            //是否顯示垂直滾動條
            if ((currRect.Height + 2 * borderWidth) > ClientSize.Height)
            { vScrollBar.Visible = true; }
            else
            { vScrollBar.Visible = false; }
        }

        /// <summary>
        /// 設置水平滾動條與垂直滾動條值
        /// </summary>
        private void setScrollBarsValues()
        {
            //設置水平滾動條值
            if (hScrollBar.Visible)
            {
                hScrollBar.Minimum = 0;
                hScrollBar.Maximum = currRect.Width - ClientSize.Width + 2 * borderWidth;
                hScrollBar.LargeChange = currRect.Width / 10;
                if (vScrollBar.Visible)
                {
                    hScrollBar.Maximum += vScrollBar.Width;
                }
                if (hScrollBar.LargeChange > hScrollBar.Maximum)
                {
                    hScrollBar.LargeChange = hScrollBar.Maximum - 1;
                }
                hScrollBar.SmallChange = hScrollBar.LargeChange / 5;
                hScrollBar.Maximum += hScrollBar.LargeChange;

                //繪製座標爲中心點
                if (this.SizeMode == PictureBoxSizeMode.CenterImage)
                {
                    if (hScrollBar.Value == 0 || isMoveScrollBar == false)
                    {
                        hScrollBar.Value = (hScrollBar.Maximum - hScrollBar.LargeChange) / 2;
                    }
                }
            }
            else
            { hScrollBar.Value = 0; }

            //設置垂直滾動條值
            if (vScrollBar.Visible)
            {
                vScrollBar.Minimum = 0;
                vScrollBar.Maximum = currRect.Height - ClientSize.Height + 2 * borderWidth;
                vScrollBar.LargeChange = currRect.Height / 10;
                if (hScrollBar.Visible)
                {
                    vScrollBar.Maximum += hScrollBar.Height;
                }
                if (vScrollBar.LargeChange > vScrollBar.Maximum)
                {
                    vScrollBar.LargeChange = vScrollBar.Maximum - 1;
                }
                vScrollBar.SmallChange = vScrollBar.LargeChange / 5;
                vScrollBar.Maximum += vScrollBar.LargeChange;

                //繪製座標爲中心點
                if (this.SizeMode == PictureBoxSizeMode.CenterImage)
                {
                    if (vScrollBar.Value == 0 || isMoveScrollBar ==false)
                    {                        
                        vScrollBar.Value = (vScrollBar.Maximum - vScrollBar.LargeChange) / 2;
                    }
                }
            }
            else
            { vScrollBar.Value = 0; }
        }

        /// <summary>
        /// 移動水平滾動條事件
        /// </summary>
        private void scrollBar_Scroll(object sender, ScrollEventArgs e)
        {
            isMoveScrollBar = true;
            using (Graphics graphics = this.CreateGraphics())
            {
                drawDisplayedScrollBars(graphics);
            }
            this.Update();
        }

        /// <summary>
        /// 重新繪製顯示的滾動條
        /// </summary>
        private void drawDisplayedScrollBars(Graphics graphics)
        {
            float x = 0, y = 0;

            if (this.SizeMode == PictureBoxSizeMode.CenterImage)
            {
                x = Math.Abs(ClientSize.Width - currBmp.Width - vScrollBar.Width) * 0.5f;
                y = Math.Abs(ClientSize.Height - currBmp.Height - hScrollBar.Height) * 0.5f;
            }
            if (hScrollBar.Visible == false)
            {//水平滾動條不可見
                destRect.X = x;
                destRect.Y = 0;
                srcRect.X = 0;
                srcRect.Y = vScrollBar.Value;
            }
            else if (vScrollBar.Visible == false)
            {//垂直滾動條不可見
                destRect.X = 0;
                destRect.Y = y;
                srcRect.Y = 0;
                srcRect.X = hScrollBar.Value;
            }
            else
            {//兩個滾動條均可見
                destRect.X = 0;
                destRect.Y = 0;
                srcRect.X = hScrollBar.Value;
                srcRect.Y = vScrollBar.Value;
            }
            destRect.Width = currBmp.Width;
            destRect.Height = currBmp.Height;
            srcRect.Width = currBmp.Width;
            srcRect.Height = currBmp.Height;
            graphics.DrawImage(currBmp, destRect, srcRect, GraphicsUnit.Pixel);
        }

        #endregion
    }
}