Spire高效稳定的.NET组件

　　年末将至，又到了一年一度的收集发票时间，平时零零碎碎的花钱都是不在意开发票，现在好了，到处找发票来报销，简直头大，

东拼西凑，终于搞定了全部发票，大伙多余的发票，麻烦艾特我一下啊，不限日期，能开发票的都可以，谢谢啦。文章后有彩蛋~

这么多的发票，一张一张打印，要浪费我多少时间，就想着合并这些PDF文件（发票）一起打印，节省时间。

还寻思这网上找一个软件来使使，都很（méi）委（līang）婉（xīn）的想收费，在线转PDF的还给我打水印，恰巧今天公司网速不行。

来吧，自己搞！程序猿没有什么不可能！

Spire.PDF

　　NPOI、DocX、Epplus……这些开源且免费的优秀组件，大家应该是耳熟能详的，而Spire是一款企业级的收费组件，Spire.PDF for .NET

是一个专业的PDF组件，用于在.NET应用程序中创建，编写，编辑，处理和阅读PDF文件，功能十分丰富…………

提取关键词：收费、稳定、高效

具体我不再过多的啰嗦了，详细我推荐看这篇《高效而稳定的企业级.NET Office 组件Spire（.NET组件介绍之二）》

合并PDF

　　回到今天的问题，合并发票，合并PDF，然后一次性打印。其实吧，主要代码就两行：

  var doc = PdfDocument.MergeFiles(allFiles.ToArray());

  doc.Save(DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf", FileFormat.PDF);

然后，你们输出之后会发现，很（méi）漂（līang）亮（xīn）的水印：

“Evaluation Warning：The document was created with Spire.PDF for .NET”

简直玷污我心爱的发票！！！！

解决

　　既然隐藏不了，那合并的第一页加入一个空页不就行了？！生成PDF后，然后从第二页开始打印或是删去第一页不就行了？！就这么干！

             var first = new PdfDocument();

             first.AppendPage();  //加入一个空页

             for (int idx = ; idx < allFiles.Count; idx++)

             {

                 var next = new PdfDocument(allFiles[idx]);

                 first.AppendPage(next);

             }

             first.SaveToFile(DateTime.Now.ToString("yyyyMMddHHmmss")+".pdf", FileFormat.PDF);

工具很简单，就不放到Git上去了，源码：

界面：

namespace 合并PDF

{

    partial class mainForm

    {

        /// <summary>

        /// 必需的设计器变量。

        /// </summary>

        private System.ComponentModel.IContainer components = null;

        /// <summary>

        /// 清理所有正在使用的资源。

        /// </summary>

        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>

        protected override void Dispose(bool disposing)

        {

            if (disposing && (components != null))

            {

                components.Dispose();

            }

            base.Dispose(disposing);

        }

        #region Windows 窗体设计器生成的代码

        /// <summary>

        /// 设计器支持所需的方法 - 不要修改

        /// 使用代码编辑器修改此方法的内容。

        /// </summary>

        private void InitializeComponent()

        {

            this.components = new System.ComponentModel.Container();

            this.btnAdd = new System.Windows.Forms.Button();

            this.btnMerge = new System.Windows.Forms.Button();

            this.bgw = new System.ComponentModel.BackgroundWorker();

            this.listView1 = new System.Windows.Forms.ListView();

            this.columnHeader1 = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));

            this.contextMenuStrip1 = new System.Windows.Forms.ContextMenuStrip(this.components);

            this.btnRemove = new System.Windows.Forms.ToolStripMenuItem();

            this.statusStrip1 = new System.Windows.Forms.StatusStrip();

            this.progressBar = new System.Windows.Forms.ToolStripProgressBar();

            this.tipStatu = new System.Windows.Forms.ToolStripStatusLabel();

            this.btnSplit = new System.Windows.Forms.Button();

            this.contextMenuStrip1.SuspendLayout();

            this.statusStrip1.SuspendLayout();

            this.SuspendLayout();

            //

            // btnAdd

            //

            this.btnAdd.Location = new System.Drawing.Point(, );

            this.btnAdd.Name = "btnAdd";

            this.btnAdd.Size = new System.Drawing.Size(, );

            this.btnAdd.TabIndex = ;

            this.btnAdd.Text = "添加文件";

            this.btnAdd.UseVisualStyleBackColor = true;

            this.btnAdd.Click += new System.EventHandler(this.btnSearch_Click);

            //

            // btnMerge

            //

            this.btnMerge.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)()));

            this.btnMerge.Location = new System.Drawing.Point(, );

            this.btnMerge.Name = "btnMerge";

            this.btnMerge.Size = new System.Drawing.Size(, );

            this.btnMerge.TabIndex = ;

            this.btnMerge.Text = "开始合并";

            this.btnMerge.UseVisualStyleBackColor = true;

            this.btnMerge.Click += new System.EventHandler(this.btnMerge_Click);

            //

            // bgw

            //

            this.bgw.WorkerReportsProgress = true;

            this.bgw.DoWork += new System.ComponentModel.DoWorkEventHandler(this.bgw_DoWork);

            this.bgw.ProgressChanged += new System.ComponentModel.ProgressChangedEventHandler(this.bgw_ProgressChanged);

            this.bgw.RunWorkerCompleted += new System.ComponentModel.RunWorkerCompletedEventHandler(this.bgw_RunWorkerCompleted);

            //

            // listView1

            //

            this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {

            this.columnHeader1});

            this.listView1.ContextMenuStrip = this.contextMenuStrip1;

            this.listView1.FullRowSelect = true;

            this.listView1.GridLines = true;

            this.listView1.Location = new System.Drawing.Point(, );

            this.listView1.MultiSelect = false;

            this.listView1.Name = "listView1";

            this.listView1.Size = new System.Drawing.Size(, );

            this.listView1.TabIndex = ;

            this.listView1.UseCompatibleStateImageBehavior = false;

            this.listView1.View = System.Windows.Forms.View.Details;

            //

            // columnHeader1

            //

            this.columnHeader1.Text = "文件";

            this.columnHeader1.Width = ;

            //

            // contextMenuStrip1

            //

            this.contextMenuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {

            this.btnRemove});

            this.contextMenuStrip1.Name = "contextMenuStrip1";

            this.contextMenuStrip1.Size = new System.Drawing.Size(, );

            //

            // btnRemove

            //

            this.btnRemove.Name = "btnRemove";

            this.btnRemove.Size = new System.Drawing.Size(, );

            this.btnRemove.Text = "移除";

            this.btnRemove.Click += new System.EventHandler(this.btnRemove_Click);

            //

            // statusStrip1

            //

            this.statusStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {

            this.progressBar,

            this.tipStatu});

            this.statusStrip1.Location = new System.Drawing.Point(, );

            this.statusStrip1.Name = "statusStrip1";

            this.statusStrip1.Size = new System.Drawing.Size(, );

            this.statusStrip1.TabIndex = ;

            this.statusStrip1.Text = "statusStrip1";

            //

            // progressBar

            //

            this.progressBar.Name = "progressBar";

            this.progressBar.Size = new System.Drawing.Size(, );

            //

            // tipStatu

            //

            this.tipStatu.Name = "tipStatu";

            this.tipStatu.Size = new System.Drawing.Size(, );

            this.tipStatu.Text = "0/0";

            //

            // btnSplit

            //

            this.btnSplit.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)()));

            this.btnSplit.Location = new System.Drawing.Point(, );

            this.btnSplit.Name = "btnSplit";

            this.btnSplit.Size = new System.Drawing.Size(, );

            this.btnSplit.TabIndex = ;

            this.btnSplit.Text = "开始拆分";

            this.btnSplit.UseVisualStyleBackColor = true;

            this.btnSplit.Click += new System.EventHandler(this.btnSplit_Click);

            //

            // mainForm

            //

            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

            this.ClientSize = new System.Drawing.Size(, );

            this.Controls.Add(this.btnSplit);

            this.Controls.Add(this.statusStrip1);

            this.Controls.Add(this.listView1);

            this.Controls.Add(this.btnMerge);

            this.Controls.Add(this.btnAdd);

            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;

            this.MaximizeBox = false;

            this.MaximumSize = new System.Drawing.Size(, );

            this.MinimumSize = new System.Drawing.Size(, );

            this.Name = "mainForm";

            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;

            this.Text = "PDF Merge";

            this.contextMenuStrip1.ResumeLayout(false);

            this.statusStrip1.ResumeLayout(false);

            this.statusStrip1.PerformLayout();

            this.ResumeLayout(false);

            this.PerformLayout();

        }

        #endregion

        private System.Windows.Forms.Button btnAdd;

        private System.Windows.Forms.Button btnMerge;

        private System.ComponentModel.BackgroundWorker bgw;

        private System.Windows.Forms.ListView listView1;

        private System.Windows.Forms.ColumnHeader columnHeader1;

        private System.Windows.Forms.StatusStrip statusStrip1;

        private System.Windows.Forms.ToolStripProgressBar progressBar;

        private System.Windows.Forms.ToolStripStatusLabel tipStatu;

        private System.Windows.Forms.ContextMenuStrip contextMenuStrip1;

        private System.Windows.Forms.ToolStripMenuItem btnRemove;

        private System.Windows.Forms.Button btnSplit;

    }

}

后台：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Windows.Forms;

using Spire.Pdf;

using System.Threading;

using Spire.Pdf.Graphics;

using System.Drawing;

using System.IO;

namespace 合并PDF

{

    public partial class mainForm : Form

    {

        public mainForm()

        {

            InitializeComponent();

        }

        List<string> allFiles = new List<string>();

        private void btnSearch_Click(object sender, EventArgs e)

        {

            OpenFileDialog openFile = new OpenFileDialog();

            openFile.Filter = "PDF文件|*.pdf";

            openFile.Multiselect = true;

            if (openFile.ShowDialog() == DialogResult.OK)

            {

                foreach (var fi in openFile.FileNames)

                {

                    if (allFiles.Contains(fi))

                        continue;

                    this.listView1.Items.Add(new ListViewItem(fi));

                    allFiles.Add(fi);

                }

                progressBar.Minimum = ;

                progressBar.Maximum = allFiles.Count;

            }

        }

        bool bMerge = false;

        private void btnMerge_Click(object sender, EventArgs e)

        {

            if (!bgw.IsBusy)

            {

                if (allFiles.Count <= )

                {

                    MessageBox.Show("请至少选择 2 个PDF文件");

                    return;

                }

                CtrlStatu(false);

                bMerge = true;

                bgw.RunWorkerAsync();

            }

        }

        void Merge()

        {

            var first = new PdfDocument();

            first.AppendPage();  //加入一个空页

            for (int idx = ; idx < allFiles.Count; idx++)

            {

                var next = new PdfDocument(allFiles[idx]);

                first.AppendPage(next);

                ReportInfo(idx + , allFiles.Count);

                Thread.Sleep();

            }

            first.SaveToFile(DateTime.Now.ToString("yyyyMMddHHmmss") + ".pdf", FileFormat.PDF);

        }

        private void CtrlStatu(bool b)

        {

            listView1.Enabled = b;

            btnMerge.Enabled = b;

            btnAdd.Enabled = b;

        }

        private void bgw_DoWork(object sender, DoWorkEventArgs e)

        {

            if (bMerge)

            {

                Merge();

            }

            if (bSplit)

            {

                Split();

            }

        }

        /// <summary>

        /// 输出消息

        /// </summary>

        public void ReportInfo(int idx, int count)

        {

            bgw.ReportProgress(, idx + "/" + count);

        }

        private void bgw_ProgressChanged(object sender, ProgressChangedEventArgs e)

        {

            var userState = e.UserState.ToString();

            tipStatu.Text = userState;

            progressBar.Value = Convert.ToInt32(userState.Split('/')[]);

        }

        private void bgw_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

        {

            tipStatu.Text = "完成...";

            CtrlStatu(true);

            bMerge = bSplit = false;

        }

        private void btnRemove_Click(object sender, EventArgs e)

        {

            if (this.listView1.SelectedItems.Count > )

            {

                int idx = this.listView1.SelectedItems[].Index;

                allFiles.Remove(this.listView1.SelectedItems[].Text);

                this.listView1.Items[idx].Remove();

            }

        }

        bool bSplit = false;

        private void btnSplit_Click(object sender, EventArgs e)

        {

            if (!bgw.IsBusy)

            {

                if (allFiles.Count < )

                {

                    MessageBox.Show("请至少选择 1 个PDF文件");

                    return;

                }

                CtrlStatu(false);

                bSplit = true;

                bgw.RunWorkerAsync();

            }

        }

        void Split()

        {

            var dir = System.Windows.Forms.Application.StartupPath + "\\拆分";

            if (!Directory.Exists(dir))

            {

                Directory.CreateDirectory(dir);

            }

            string path = "";

            PdfTextLayout format = new PdfTextLayout();

            format.Break = PdfLayoutBreakType.FitPage;

            format.Layout = PdfLayoutType.Paginate;

            string curTime = DateTime.Now.ToString("yyyyMMddHHmmss");

            for (int idx = ; idx < allFiles.Count; idx++)

            {

                PdfDocument pdf = new PdfDocument();

                FileInfo file = new FileInfo(allFiles[idx]);

                string fileName = file.Name.Replace(file.Extension, "");

                pdf.LoadFromFile(allFiles[idx]);

                path = string.Format("{0}\\{1}_",dir, fileName) + "第{0}页_"+curTime+".pdf";

                pdf.Split(path);

                pdf.Close();

                ReportInfo(idx + , allFiles.Count);

                Thread.Sleep();

            }

        }

    }

}

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