JPG与PDF格式转换器

 该插件可实现JPG与PDF格式的互转。

 

MainForm.Designer.cs

using System.Windows.Forms;
namespace JpgToPdfConverter
{partial class MainForm{private System.ComponentModel.IContainer components = null;protected override void Dispose(bool disposing){if (disposing && (components != null)){components.Dispose();}base.Dispose(disposing);}#region Windows Form Designer generated codeprivate void InitializeComponent(){this.btnSelectJpgFiles = new System.Windows.Forms.Button();this.lstJpgFiles = new System.Windows.Forms.ListBox();this.btnConvertJpgToPdf = new System.Windows.Forms.Button();this.lblJpgStatus = new System.Windows.Forms.Label();this.btnClearJpg = new System.Windows.Forms.Button();this.btnSelectPdfFiles = new System.Windows.Forms.Button();this.lstPdfFiles = new System.Windows.Forms.ListBox();this.btnConvertPdfToJpg = new System.Windows.Forms.Button();this.lblPdfStatus = new System.Windows.Forms.Label();this.btnClearPdf = new System.Windows.Forms.Button();this.tabControl1 = new System.Windows.Forms.TabControl();this.tabPageJpgToPdf = new System.Windows.Forms.TabPage();this.tabPagePdfToJpg = new System.Windows.Forms.TabPage();this.label1 = new System.Windows.Forms.Label();this.nudDpi = new System.Windows.Forms.NumericUpDown();this.tabControl1.SuspendLayout();this.tabPageJpgToPdf.SuspendLayout();this.tabPagePdfToJpg.SuspendLayout();((System.ComponentModel.ISupportInitialize)(this.nudDpi)).BeginInit();this.SuspendLayout();// // btnSelectJpgFiles// this.btnSelectJpgFiles.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnSelectJpgFiles.Location = new System.Drawing.Point(5, 5);this.btnSelectJpgFiles.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.btnSelectJpgFiles.Name = "btnSelectJpgFiles";this.btnSelectJpgFiles.Size = new System.Drawing.Size(111, 24);this.btnSelectJpgFiles.TabIndex = 0;this.btnSelectJpgFiles.Text = "选择JPG文件";this.btnSelectJpgFiles.UseVisualStyleBackColor = true;this.btnSelectJpgFiles.Click += new System.EventHandler(this.btnSelectJpgFiles_Click);// // lstJpgFiles// this.lstJpgFiles.FormattingEnabled = true;this.lstJpgFiles.HorizontalScrollbar = true;this.lstJpgFiles.ItemHeight = 12;this.lstJpgFiles.Location = new System.Drawing.Point(5, 34);this.lstJpgFiles.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.lstJpgFiles.Name = "lstJpgFiles";this.lstJpgFiles.Size = new System.Drawing.Size(388, 172);this.lstJpgFiles.TabIndex = 1;// // btnConvertJpgToPdf// this.btnConvertJpgToPdf.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnConvertJpgToPdf.Location = new System.Drawing.Point(5, 210);this.btnConvertJpgToPdf.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.btnConvertJpgToPdf.Name = "btnConvertJpgToPdf";this.btnConvertJpgToPdf.Size = new System.Drawing.Size(111, 24);this.btnConvertJpgToPdf.TabIndex = 2;this.btnConvertJpgToPdf.Text = "转换为PDF";this.btnConvertJpgToPdf.UseVisualStyleBackColor = true;this.btnConvertJpgToPdf.Click += new System.EventHandler(this.btnConvertJpgToPdf_Click);// // lblJpgStatus// this.lblJpgStatus.AutoSize = true;this.lblJpgStatus.Location = new System.Drawing.Point(122, 218);this.lblJpgStatus.Name = "lblJpgStatus";this.lblJpgStatus.Size = new System.Drawing.Size(0, 12);this.lblJpgStatus.TabIndex = 3;// // btnClearJpg// this.btnClearJpg.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnClearJpg.Location = new System.Drawing.Point(281, 210);this.btnClearJpg.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.btnClearJpg.Name = "btnClearJpg";this.btnClearJpg.Size = new System.Drawing.Size(111, 24);this.btnClearJpg.TabIndex = 4;this.btnClearJpg.Text = "清除列表";this.btnClearJpg.UseVisualStyleBackColor = true;this.btnClearJpg.Click += new System.EventHandler(this.btnClearJpg_Click);// // btnSelectPdfFiles// this.btnSelectPdfFiles.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnSelectPdfFiles.Location = new System.Drawing.Point(5, 5);this.btnSelectPdfFiles.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.btnSelectPdfFiles.Name = "btnSelectPdfFiles";this.btnSelectPdfFiles.Size = new System.Drawing.Size(111, 24);this.btnSelectPdfFiles.TabIndex = 5;this.btnSelectPdfFiles.Text = "选择PDF文件";this.btnSelectPdfFiles.UseVisualStyleBackColor = true;this.btnSelectPdfFiles.Click += new System.EventHandler(this.btnSelectPdfFiles_Click);// // lstPdfFiles// this.lstPdfFiles.FormattingEnabled = true;this.lstPdfFiles.HorizontalScrollbar = true;this.lstPdfFiles.ItemHeight = 12;this.lstPdfFiles.Location = new System.Drawing.Point(5, 34);this.lstPdfFiles.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.lstPdfFiles.Name = "lstPdfFiles";this.lstPdfFiles.Size = new System.Drawing.Size(388, 136);this.lstPdfFiles.TabIndex = 6;// // btnConvertPdfToJpg// this.btnConvertPdfToJpg.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnConvertPdfToJpg.Location = new System.Drawing.Point(5, 210);this.btnConvertPdfToJpg.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.btnConvertPdfToJpg.Name = "btnConvertPdfToJpg";this.btnConvertPdfToJpg.Size = new System.Drawing.Size(111, 24);this.btnConvertPdfToJpg.TabIndex = 7;this.btnConvertPdfToJpg.Text = "转换为JPG";this.btnConvertPdfToJpg.UseVisualStyleBackColor = true;this.btnConvertPdfToJpg.Click += new System.EventHandler(this.btnConvertPdfToJpg_Click);// // lblPdfStatus// this.lblPdfStatus.AutoSize = true;this.lblPdfStatus.Location = new System.Drawing.Point(122, 218);this.lblPdfStatus.Name = "lblPdfStatus";this.lblPdfStatus.Size = new System.Drawing.Size(0, 12);this.lblPdfStatus.TabIndex = 8;// // btnClearPdf// this.btnClearPdf.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));this.btnClearPdf.Location = new System.Drawing.Point(281, 210);this.btnClearPdf.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.btnClearPdf.Name = "btnClearPdf";this.btnClearPdf.Size = new System.Drawing.Size(111, 24);this.btnClearPdf.TabIndex = 9;this.btnClearPdf.Text = "清除列表";this.btnClearPdf.UseVisualStyleBackColor = true;this.btnClearPdf.Click += new System.EventHandler(this.btnClearPdf_Click);// // tabControl1// this.tabControl1.Controls.Add(this.tabPageJpgToPdf);this.tabControl1.Controls.Add(this.tabPagePdfToJpg);this.tabControl1.Dock = System.Windows.Forms.DockStyle.Fill;this.tabControl1.Location = new System.Drawing.Point(0, 0);this.tabControl1.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.tabControl1.Name = "tabControl1";this.tabControl1.SelectedIndex = 0;this.tabControl1.Size = new System.Drawing.Size(422, 277);this.tabControl1.TabIndex = 10;// // tabPageJpgToPdf// this.tabPageJpgToPdf.Controls.Add(this.btnSelectJpgFiles);this.tabPageJpgToPdf.Controls.Add(this.btnClearJpg);this.tabPageJpgToPdf.Controls.Add(this.lstJpgFiles);this.tabPageJpgToPdf.Controls.Add(this.lblJpgStatus);this.tabPageJpgToPdf.Controls.Add(this.btnConvertJpgToPdf);this.tabPageJpgToPdf.Location = new System.Drawing.Point(4, 22);this.tabPageJpgToPdf.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.tabPageJpgToPdf.Name = "tabPageJpgToPdf";this.tabPageJpgToPdf.Padding = new System.Windows.Forms.Padding(3, 2, 3, 2);this.tabPageJpgToPdf.Size = new System.Drawing.Size(414, 251);this.tabPageJpgToPdf.TabIndex = 0;this.tabPageJpgToPdf.Text = "JPG转PDF";this.tabPageJpgToPdf.UseVisualStyleBackColor = true;// // tabPagePdfToJpg// this.tabPagePdfToJpg.Controls.Add(this.label1);this.tabPagePdfToJpg.Controls.Add(this.nudDpi);this.tabPagePdfToJpg.Controls.Add(this.btnSelectPdfFiles);this.tabPagePdfToJpg.Controls.Add(this.lstPdfFiles);this.tabPagePdfToJpg.Controls.Add(this.btnConvertPdfToJpg);this.tabPagePdfToJpg.Controls.Add(this.btnClearPdf);this.tabPagePdfToJpg.Controls.Add(this.lblPdfStatus);this.tabPagePdfToJpg.Location = new System.Drawing.Point(4, 22);this.tabPagePdfToJpg.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.tabPagePdfToJpg.Name = "tabPagePdfToJpg";this.tabPagePdfToJpg.Padding = new System.Windows.Forms.Padding(3, 2, 3, 2);this.tabPagePdfToJpg.Size = new System.Drawing.Size(402, 241);this.tabPagePdfToJpg.TabIndex = 1;this.tabPagePdfToJpg.Text = "PDF转JPG";this.tabPagePdfToJpg.UseVisualStyleBackColor = true;// // label1// this.label1.AutoSize = true;this.label1.Location = new System.Drawing.Point(213, 180);this.label1.Name = "label1";this.label1.Size = new System.Drawing.Size(101, 12);this.label1.TabIndex = 11;this.label1.Text = "输出图片DPI设置:";// // nudDpi// this.nudDpi.Location = new System.Drawing.Point(318, 176);this.nudDpi.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.nudDpi.Maximum = new decimal(new int[] {600,0,0,0});this.nudDpi.Minimum = new decimal(new int[] {72,0,0,0});this.nudDpi.Name = "nudDpi";this.nudDpi.Size = new System.Drawing.Size(74, 21);this.nudDpi.TabIndex = 10;this.nudDpi.TextAlign = System.Windows.Forms.HorizontalAlignment.Center;this.nudDpi.Value = new decimal(new int[] {300,0,0,0});// // MainForm// this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;this.ClientSize = new System.Drawing.Size(422, 277);this.Controls.Add(this.tabControl1);this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;this.Margin = new System.Windows.Forms.Padding(3, 2, 3, 2);this.MaximizeBox = false;this.MinimizeBox = false;this.Name = "MainForm";this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;this.Text = "JPG/PDF转换器  作者: 山水(qq443440204)";this.tabControl1.ResumeLayout(false);this.tabPageJpgToPdf.ResumeLayout(false);this.tabPageJpgToPdf.PerformLayout();this.tabPagePdfToJpg.ResumeLayout(false);this.tabPagePdfToJpg.PerformLayout();((System.ComponentModel.ISupportInitialize)(this.nudDpi)).EndInit();this.ResumeLayout(false);}#endregionprivate System.Windows.Forms.Button btnSelectJpgFiles;private System.Windows.Forms.ListBox lstJpgFiles;private System.Windows.Forms.Button btnConvertJpgToPdf;private System.Windows.Forms.Label lblJpgStatus;private System.Windows.Forms.Button btnClearJpg;private System.Windows.Forms.Button btnSelectPdfFiles;private System.Windows.Forms.ListBox lstPdfFiles;private System.Windows.Forms.Button btnConvertPdfToJpg;private System.Windows.Forms.Label lblPdfStatus;private System.Windows.Forms.Button btnClearPdf;private System.Windows.Forms.TabControl tabControl1;private System.Windows.Forms.TabPage tabPageJpgToPdf;private System.Windows.Forms.TabPage tabPagePdfToJpg;private System.Windows.Forms.NumericUpDown nudDpi;private System.Windows.Forms.Label label1;}
}

MainForm.cs

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Windows.Forms;
using PdfSharp.Drawing;
using PdfSharp.Pdf;
using static System.Net.Mime.MediaTypeNames;
using Image = System.Drawing.Image;namespace JpgToPdfConverter
{public partial class MainForm : Form{// 存储选择的文件路径private List<string> selectedJpgFiles = new List<string>();private List<string> selectedPdfFiles = new List<string>();public MainForm(){InitializeComponent();}#region JPG转PDF功能// 选择JPG文件按钮点击事件private void btnSelectJpgFiles_Click(object sender, EventArgs e){using (OpenFileDialog openFileDialog = new OpenFileDialog()){openFileDialog.Filter = "JPG文件 (*.jpg;*.jpeg)|*.jpg;*.jpeg|所有文件 (*.*)|*.*";openFileDialog.Multiselect = true;openFileDialog.Title = "选择JPG文件";if (openFileDialog.ShowDialog() == DialogResult.OK){selectedJpgFiles.AddRange(openFileDialog.FileNames);UpdateJpgFileList();}}}// 更新JPG文件列表显示private void UpdateJpgFileList(){lstJpgFiles.Items.Clear();foreach (string file in selectedJpgFiles){lstJpgFiles.Items.Add(Path.GetFileName(file));}UpdateJpgStatus($"已选择 {selectedJpgFiles.Count} 个文件");}// 更新JPG转换状态private void UpdateJpgStatus(string message){lblJpgStatus.Text = message;}// 清除JPG文件列表private void btnClearJpg_Click(object sender, EventArgs e){selectedJpgFiles.Clear();UpdateJpgFileList();}// JPG转PDF按钮点击事件private void btnConvertJpgToPdf_Click(object sender, EventArgs e){if (selectedJpgFiles.Count == 0){MessageBox.Show("请先选择JPG文件！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);return;}using (SaveFileDialog saveFileDialog = new SaveFileDialog()){saveFileDialog.Filter = "PDF文件 (*.pdf)|*.pdf|所有文件 (*.*)|*.*";saveFileDialog.Title = "保存PDF文件";saveFileDialog.FileName = "转换结果.pdf";if (saveFileDialog.ShowDialog() == DialogResult.OK){try{UpdateJpgStatus("正在转换...");Cursor = Cursors.WaitCursor;ConvertJpgToPdf(selectedJpgFiles, saveFileDialog.FileName);UpdateJpgStatus("转换完成！");MessageBox.Show($"PDF文件已保存至：{saveFileDialog.FileName}", "成功", MessageBoxButtons.OK, MessageBoxIcon.Information);}catch (Exception ex){UpdateJpgStatus("转换失败！");MessageBox.Show($"转换过程中发生错误：{ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);}finally{Cursor = Cursors.Default;}}}}// JPG转PDF核心方法//private void ConvertJpgToPdf(List<string> jpgFiles, string pdfPath)//{//    using (PdfDocument pdf = new PdfDocument())//    {//        foreach (string jpgFile in jpgFiles)//        {//            try//            {//                // 获取图像尺寸//                using (Image image = Image.FromFile(jpgFile))//                {//                    PdfPage page = pdf.AddPage();//                    page.Width = image.Width;//                    page.Height = image.Height;//                }//                // 从文件加载图像到PDF//                PdfPage pdfPage = pdf.Pages[pdf.Pages.Count - 1];//                XGraphics gfx = XGraphics.FromPdfPage(pdfPage);//                XImage xImage = XImage.FromFile(jpgFile);//                gfx.DrawImage(xImage, 0, 0);//            }//            catch (Exception ex)//            {//                MessageBox.Show($"处理文件 {Path.GetFileName(jpgFile)} 时出错：{ex.Message}", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);//            }//        }//        pdf.Save(pdfPath);//    }//}#endregionprivate void ConvertJpgToPdf(List<string> jpgFiles, string pdfPath){using (PdfDocument pdf = new PdfDocument()){foreach (string jpgFile in jpgFiles){using (Image image = Image.FromFile(jpgFile)){PdfPage page = pdf.AddPage();// 直接按像素数设置页面尺寸（1点=1像素）page.Width = image.Width;page.Height = image.Height;XGraphics gfx = XGraphics.FromPdfPage(page);XImage xImage = XImage.FromFile(jpgFile);gfx.DrawImage(xImage, 0, 0, page.Width, page.Height);}}pdf.Save(pdfPath);}}#region PDF转JPG功能// 选择PDF文件按钮点击事件private void btnSelectPdfFiles_Click(object sender, EventArgs e){using (OpenFileDialog openFileDialog = new OpenFileDialog()){openFileDialog.Filter = "PDF文件 (*.pdf)|*.pdf|所有文件 (*.*)|*.*";openFileDialog.Multiselect = true;openFileDialog.Title = "选择PDF文件";if (openFileDialog.ShowDialog() == DialogResult.OK){selectedPdfFiles.AddRange(openFileDialog.FileNames);UpdatePdfFileList();}}}// 更新PDF文件列表显示private void UpdatePdfFileList(){lstPdfFiles.Items.Clear();foreach (string file in selectedPdfFiles){lstPdfFiles.Items.Add(Path.GetFileName(file));}UpdatePdfStatus($"已选择 {selectedPdfFiles.Count} 个文件");}// 更新PDF转换状态private void UpdatePdfStatus(string message){lblPdfStatus.Text = message;}// 清除PDF文件列表private void btnClearPdf_Click(object sender, EventArgs e){selectedPdfFiles.Clear();UpdatePdfFileList();}// PDF转JPG按钮点击事件private void btnConvertPdfToJpg_Click(object sender, EventArgs e){if (selectedPdfFiles.Count == 0){MessageBox.Show("请先选择PDF文件！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);return;}using (FolderBrowserDialog folderBrowserDialog = new FolderBrowserDialog()){folderBrowserDialog.Description = "选择保存JPG文件的文件夹";if (folderBrowserDialog.ShowDialog() == DialogResult.OK){try{UpdatePdfStatus("正在转换...");Cursor = Cursors.WaitCursor;int dpi = (int)nudDpi.Value;ConvertPdfToJpg(selectedPdfFiles, folderBrowserDialog.SelectedPath, dpi);UpdatePdfStatus("转换完成！");MessageBox.Show($"JPG文件已保存至：{folderBrowserDialog.SelectedPath}", "成功", MessageBoxButtons.OK, MessageBoxIcon.Information);}catch (Exception ex){UpdatePdfStatus("转换失败！");MessageBox.Show($"转换过程中发生错误：{ex.Message}", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);}finally{Cursor = Cursors.Default;}}}}// PDF转JPG核心方法private void ConvertPdfToJpg(List<string> pdfFiles, string outputFolder, int dpi){foreach (string pdfFile in pdfFiles){try{string fileNameWithoutExt = Path.GetFileNameWithoutExtension(pdfFile);string fileOutputFolder = Path.Combine(outputFolder, fileNameWithoutExt);// 为每个PDF创建单独的文件夹Directory.CreateDirectory(fileOutputFolder);using (PdfiumViewer.PdfDocument document = PdfiumViewer.PdfDocument.Load(pdfFile)){int pageCount = document.PageCount;for (int i = 0; i < pageCount; i++){string outputPath = Path.Combine(fileOutputFolder, $"{fileNameWithoutExt}_第{i + 1}页.jpg");using (Bitmap image = (Bitmap)document.Render(i, dpi, dpi, false)){image.Save(outputPath, System.Drawing.Imaging.ImageFormat.Jpeg);}}}}catch (Exception ex){MessageBox.Show($"处理文件 {Path.GetFileName(pdfFile)} 时出错：{ex.Message}", "警告", MessageBoxButtons.OK, MessageBoxIcon.Warning);return;}}}#endregion}
}

Program.cs

using System;
using System.Windows.Forms;namespace JpgToPdfConverter
{static class Program{[STAThread]static void Main(){Application.EnableVisualStyles();Application.SetCompatibleTextRenderingDefault(false);Application.Run(new MainForm());}}
}