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 = 0; 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(409, 12);
            this.btnAdd.Name = "btnAdd";
            this.btnAdd.Size = new System.Drawing.Size(67, 24);
            this.btnAdd.TabIndex = 2;
            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)(134)));
            this.btnMerge.Location = new System.Drawing.Point(409, 43);
            this.btnMerge.Name = "btnMerge";
            this.btnMerge.Size = new System.Drawing.Size(67, 24);
            this.btnMerge.TabIndex = 3;
            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(12, 12);
            this.listView1.MultiSelect = false;
            this.listView1.Name = "listView1";
            this.listView1.Size = new System.Drawing.Size(391, 190);
            this.listView1.TabIndex = 4;
            this.listView1.UseCompatibleStateImageBehavior = false;
            this.listView1.View = System.Windows.Forms.View.Details;
            // 
            // columnHeader1
            // 
            this.columnHeader1.Text = "文件";
            this.columnHeader1.Width = 350;
            // 
            // contextMenuStrip1
            // 
            this.contextMenuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.btnRemove});
            this.contextMenuStrip1.Name = "contextMenuStrip1";
            this.contextMenuStrip1.Size = new System.Drawing.Size(101, 26);
            // 
            // btnRemove
            // 
            this.btnRemove.Name = "btnRemove";
            this.btnRemove.Size = new System.Drawing.Size(100, 22);
            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(0, 205);
            this.statusStrip1.Name = "statusStrip1";
            this.statusStrip1.Size = new System.Drawing.Size(488, 22);
            this.statusStrip1.TabIndex = 5;
            this.statusStrip1.Text = "statusStrip1";
            // 
            // progressBar
            // 
            this.progressBar.Name = "progressBar";
            this.progressBar.Size = new System.Drawing.Size(100, 16);
            // 
            // tipStatu
            // 
            this.tipStatu.Name = "tipStatu";
            this.tipStatu.Size = new System.Drawing.Size(27, 17);
            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)(134)));
            this.btnSplit.Location = new System.Drawing.Point(409, 73);
            this.btnSplit.Name = "btnSplit";
            this.btnSplit.Size = new System.Drawing.Size(67, 24);
            this.btnSplit.TabIndex = 6;
            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(488, 227);
            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(504, 266);
            this.MinimumSize = new System.Drawing.Size(504, 266);
            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 = 0;
                progressBar.Maximum = allFiles.Count;
            }
        }

        bool bMerge = false;
        private void btnMerge_Click(object sender, EventArgs e)
        {
            if (!bgw.IsBusy)
            {
                if (allFiles.Count <= 1)
                {
                    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 = 0; idx < allFiles.Count; idx++)
            {
                var next = new PdfDocument(allFiles[idx]);
                first.AppendPage(next);
                ReportInfo(idx + 1, allFiles.Count);
                Thread.Sleep(100);
            }
            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(1, idx + "/" + count);
        }

        private void bgw_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            var userState = e.UserState.ToString();
            tipStatu.Text = userState;
            progressBar.Value = Convert.ToInt32(userState.Split('/')[0]);
        }

        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 > 0)
            {
                int idx = this.listView1.SelectedItems[0].Index;
                allFiles.Remove(this.listView1.SelectedItems[0].Text);
                this.listView1.Items[idx].Remove();
            }
        }

        bool bSplit = false;
        private void btnSplit_Click(object sender, EventArgs e)
        {
            if (!bgw.IsBusy)
            {
                if (allFiles.Count < 1)
                {
                    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 = 0; 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 + 1, allFiles.Count);
                Thread.Sleep(100);
            }
        }
    }
}

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