C#在线预览文档（word，excel，pdf，txt，png）

                             C#在线预览文档（word，excel，pdf，txt，png）

1、预览方式：将word文件转换成html文件然后预览html文件
2、预览word文件：需要引入Interop.Microsoft.Office.Interop.Word.dll（Com组件）
3、预览Excel文件：需要引入Interop.Microsoft.Office.Interop.Excel.dll（Com组件，Microsoft Excel 12.0(or other version) Object Library）
4、PDF文件直接嵌入到浏览器中进行查看，无需转换（需安装pdf阅读器）
5、文本文件直接嵌入到浏览器进行查看，无需转换

6、图片文件直接嵌入到浏览器进行查看，无需转换

Excel预览方法
using Microsoft.Office.Interop.Excel;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for ExcelPreview
/// </summary>
public class ExcelPreview
{
    public static void Priview(System.Web.UI.Page p, string inFilePath, string outDirPath = "")
    {
        Microsoft.Office.Interop.Excel.Application excel = null;
        Microsoft.Office.Interop.Excel.Workbook xls = null;
        excel = new Microsoft.Office.Interop.Excel.Application();
        object missing = Type.Missing;
        object trueObject = true;
        excel.Visible = false;
        excel.DisplayAlerts = false;

        string randomName = DateTime.Now.Ticks.ToString();  //output fileName

        xls = excel.Workbooks.Open(inFilePath, missing, trueObject, missing,
                                    missing, missing, missing, missing, missing, missing, missing, missing,
                                    missing, missing, missing);

        //Save Excel to Html
        object format = Microsoft.Office.Interop.Excel.XlFileFormat.xlHtml;
        Workbook wsCurrent = xls;//(Workbook)wsEnumerator.Current;
        String outputFile = outDirPath + randomName + ".html";
        wsCurrent.SaveAs(outputFile, format, missing, missing, missing,
                          missing, XlSaveAsAccessMode.xlNoChange, missing,
                          missing, missing, missing, missing);
        excel.Quit();

        //Open generated Html
        Process process = new Process();
        process.StartInfo.UseShellExecute = true;
        process.StartInfo.FileName = outputFile;
        process.Start();
    }

}

Pdf类

using Microsoft.Office.Interop.Word;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for WordPreview
/// </summary>
public class PDFPreview
{
    public static void Priview(System.Web.UI.Page p, string inFilePath)
    {
        p.Response.ContentType = "Application/pdf";

        string fileName = inFilePath.Substring(inFilePath.LastIndexOf('\') + 1);
        p.Response.AddHeader("content-disposition", "filename=" + fileName);
        p.Response.WriteFile(inFilePath);
        p.Response.End();
    }
}
Word预览方法

using Microsoft.Office.Interop.Word;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Web;

/// <summary>
/// Summary description for WordPreview
/// </summary>
public class WordPreview
{
    public static void Priview(System.Web.UI.Page p, string inFilePath, string outDirPath = "")
    {
        object missingType = Type.Missing;
        object readOnly = true;
        object isVisible = false;
        object documentFormat = 8;
        string randomName = DateTime.Now.Ticks.ToString();
        object htmlFilePath = outDirPath + randomName + ".htm";
        string directoryPath = outDirPath + randomName + ".files";

        object filePath = inFilePath;
        //Open the word document in background
        ApplicationClass applicationclass = new ApplicationClass();
        applicationclass.Documents.Open(ref filePath,
                                        ref readOnly,
                                        ref missingType, ref missingType, ref missingType,
                                        ref missingType, ref missingType, ref  missingType,
                                        ref missingType, ref missingType, ref isVisible,
                                        ref missingType, ref missingType, ref missingType,
                                        ref missingType, ref missingType);
        applicationclass.Visible = false;
        Document document = applicationclass.ActiveDocument;

        //Save the word document as HTML file
        document.SaveAs(ref htmlFilePath, ref documentFormat, ref missingType,
                        ref missingType, ref missingType, ref missingType,
                        ref missingType, ref missingType, ref missingType,
                        ref missingType, ref missingType, ref missingType,
                        ref missingType, ref missingType, ref missingType,
                        ref missingType);

        //Close the word document
        document.Close(ref missingType, ref missingType, ref missingType);

        #region Read the Html File as Byte Array and Display it on browser
        //byte[] bytes;
        //using (FileStream fs = new FileStream(htmlFilePath.ToString(), FileMode.Open, FileAccess.Read))
        //{
        //    BinaryReader reader = new BinaryReader(fs);
        //    bytes = reader.ReadBytes((int)fs.Length);
        //    fs.Close();
        //}
        //p.Response.BinaryWrite(bytes);
        //p.Response.Flush();
        //p.Response.End();
        #endregion

        Process process = new Process();
        process.StartInfo.UseShellExecute = true;
        process.StartInfo.FileName = htmlFilePath.ToString();
        process.Start();

        #region Delete the Html File and Diretory 删除生成的文件
        //File.Delete(htmlFilePath.ToString());
        //foreach (string file in Directory.GetFiles(directoryPath))
        //{
        //    File.Delete(file);
        //}
        //Directory.Delete(directoryPath);
        #endregion
    }
}
文本预览方法
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;

/// <summary>
/// Summary description for TextFilePreview
/// </summary>
public class TextFilePreview
{
    public static void Preview(System.Web.UI.Page p, string inFilePath)
    {
        string fileName = inFilePath.Substring(inFilePath.LastIndexOf('\') + 1);

        p.Response.ContentType = "text/plain";
        p.Response.ContentEncoding = System.Text.Encoding.UTF8;  //保持和文件的编码格式一致
        p.Response.AddHeader("content-disposition", "filename=" + fileName);
        p.Response.WriteFile(inFilePath);
        p.Response.End();
    }
}
图片预览方法

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Web;

/// <summary>
/// Summary description for TextFilePreview
/// </summary>
public class TextFilePreview
{
    public static void Preview(System.Web.UI.Page p, string inFilePath)
    {
        string fileName = inFilePath.Substring(inFilePath.LastIndexOf('\') + 1);

        p.Response.ContentType = "images/*";
        p.Response.ContentEncoding = System.Text.Encoding.UTF8;  
        p.Response.AddHeader("content-disposition", "filename=" + fileName);
        p.Response.WriteFile(inFilePath);
        p.Response.End();
    }
}

 以上的pdf,txt，图片这个三种方式在MVC下不可用，在aspx界面可用。研究后进行了更改

 以上是转成html进行预览，预览效果不是太好。以下是转成pdf预览代码

  1 新建windows应用程序项目
  2 
  3 添加以下com组件的引用
  4 
  5 Microsoft Word 12.0 Object Library
  6 
  7 Microsoft PowerPoint 12.0 Object Library
  8 
  9 Microsoft Excel 12.0 Object Library
 10 
 11  
 12 
 13 ------------------------------------------------------
 14 
 15 using Word = Microsoft.Office.Interop.Word; using Excel = Microsoft.Office.Interop.Excel; using PowerPoint = Microsoft.Office.Interop.PowerPoint;
 16 
 17 using Microsoft.Office.Core;
 18 
 19  
 20 
 21 我们可以使用一个枚举类型来决定生成文件的类型
 22 
 23 Word.WdExportFormat wd = Microsoft.Office.Interop.Word.WdExportFormat.wdExportFormatPDF;
 24 
 25 Excel.XlFixedFormatType excelType = Microsoft.Office.Interop.Excel.XlFixedFormatType.xlTypePDF; PowerPoint.PpSaveAsFileType ppType = Microsoft.Office.Interop.PowerPoint.PpSaveAsFileType.ppSaveAsPDF;
 26 
 27 
 28   //将word文档转换成PDF格式
 29     private bool Convert(string sourcePath, string targetPath, Word.WdExportFormat exportFormat)
 30     {
 31         bool result;
 32         object paramMissing = Type.Missing;
 33         Word.ApplicationClass wordApplication = new Word.ApplicationClass();
 34         Word.Document wordDocument = null;
 35         try
 36         {
 37             object paramSourceDocPath = sourcePath;
 38             string paramExportFilePath = targetPath;
 39 
 40             Word.WdExportFormat paramExportFormat = exportFormat;
 41             bool paramOpenAfterExport = false;
 42             Word.WdExportOptimizeFor paramExportOptimizeFor =
 43                     Word.WdExportOptimizeFor.wdExportOptimizeForPrint;
 44             Word.WdExportRange paramExportRange = Word.WdExportRange.wdExportAllDocument;
 45             int paramStartPage = 0;
 46             int paramEndPage = 0;
 47             Word.WdExportItem paramExportItem = Word.WdExportItem.wdExportDocumentContent;
 48             bool paramIncludeDocProps = true;
 49             bool paramKeepIRM = true;
 50             Word.WdExportCreateBookmarks paramCreateBookmarks =
 51                     Word.WdExportCreateBookmarks.wdExportCreateWordBookmarks;
 52             bool paramDocStructureTags = true;
 53             bool paramBitmapMissingFonts = true;
 54             bool paramUseISO19005_1 = false;
 55 
 56             wordDocument = wordApplication.Documents.Open(
 57                     ref paramSourceDocPath, ref paramMissing, ref paramMissing,
 58                     ref paramMissing, ref paramMissing, ref paramMissing,
 59                     ref paramMissing, ref paramMissing, ref paramMissing,
 60                     ref paramMissing, ref paramMissing, ref paramMissing,
 61                     ref paramMissing, ref paramMissing, ref paramMissing,
 62                     ref paramMissing);
 63 
 64             if (wordDocument != null)
 65                 wordDocument.ExportAsFixedFormat(paramExportFilePath,
 66                         paramExportFormat, paramOpenAfterExport,
 67                         paramExportOptimizeFor, paramExportRange, paramStartPage,
 68                         paramEndPage, paramExportItem, paramIncludeDocProps,
 69                         paramKeepIRM, paramCreateBookmarks, paramDocStructureTags,
 70                         paramBitmapMissingFonts, paramUseISO19005_1,
 71                         ref paramMissing);
 72             result = true;
 73         }
 74         finally
 75         {
 76             if (wordDocument != null)
 77             {
 78                 wordDocument.Close(ref paramMissing, ref paramMissing, ref paramMissing);
 79                 wordDocument = null;
 80             }
 81             if (wordApplication != null)
 82             {
 83                 wordApplication.Quit(ref paramMissing, ref paramMissing, ref paramMissing);
 84                 wordApplication = null;
 85             }
 86             GC.Collect();
 87             GC.WaitForPendingFinalizers();
 88             GC.Collect();
 89             GC.WaitForPendingFinalizers();
 90         }
 91         return result;
 92     }
 93 
 94     //将excel文档转换成PDF格式
 95     private bool Convert(string sourcePath, string targetPath, XlFixedFormatType targetType)
 96     {
 97         bool result;
 98         object missing = Type.Missing;
 99         Excel.ApplicationClass application = null;
100         Workbook workBook = null;
101         try
102         {
103             application = new Excel.ApplicationClass();
104             object target = targetPath;
105             object type = targetType;
106             workBook = application.Workbooks.Open(sourcePath, missing, missing, missing, missing, missing,
107                     missing, missing, missing, missing, missing, missing, missing, missing, missing);
108 
109             workBook.ExportAsFixedFormat(targetType, target, XlFixedFormatQuality.xlQualityStandard, true, false, missing, missing, missing, missing);
110             result = true;
111         }
112         catch
113         {
114             result = false;
115         }
116         finally
117         {
118             if (workBook != null)
119             {
120                 workBook.Close(true, missing, missing);
121                 workBook = null;
122             }
123             if (application != null)
124             {
125                 application.Quit();
126                 application = null;
127             }
128             GC.Collect();
129             GC.WaitForPendingFinalizers();
130             GC.Collect();
131             GC.WaitForPendingFinalizers();
132         }
133         return result;
134     }
135 
136     //将ppt文档转换成PDF格式
137     private bool Convert(string sourcePath, string targetPath, PpSaveAsFileType targetFileType)
138     {
139         bool result;
140         object missing = Type.Missing;
141         PowerPoint.ApplicationClass application = null;
142         Presentation persentation = null;
143         try
144         {
145             application = new PowerPoint.ApplicationClass();
146             persentation = application.Presentations.Open(sourcePath, MsoTriState.msoTrue, MsoTriState.msoFalse, MsoTriState.msoFalse);
147             persentation.SaveAs(targetPath, targetFileType, Microsoft.Office.Core.MsoTriState.msoTrue);
148 
149             result = true;
150         }
151         catch
152         {
153             result = false;
154         }
155         finally
156         {
157             if (persentation != null)
158             {
159                 persentation.Close();
160                 persentation = null;
161             }
162             if (application != null)
163             {
164                 application.Quit();
165                 application = null;
166             }
167             GC.Collect();
168             GC.WaitForPendingFinalizers();
169             GC.Collect();
170             GC.WaitForPendingFinalizers();
171         }
172         return result;
173     }

cshtml代码：

$.get("/Home/Index",{url:a,rnd:new Date()},function(data)

{
    if(data.status=1)
  {
   Window.Open(data.url);//在新窗口中打开预览文档
  }
});


Controller的方法

1 Public JsonResult PreView()
2 {
3     string url=Request["url"];//url 格式"/doc/123456.pdf"
4     string html=Url.Content(url);
5     return Json(new {status=1,url=html},JsonRequestBehavior.AllowGet);
6 
7 }

转载请注明出处。此方法预览PDf需要机器上安装pdf阅读器。有好方法可以交流学习。

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原文地址：https://www.cnblogs.com/softwaredeveloper/p/5358332.html