Asp.net实现直接在浏览器预览Word、Excel、PDF、Txt文件（附源码）

功能说明

输入文件路径，在浏览器输出文件预览信息，经测试360极速（Chrome）、IE9/10、Firefox通过

分类文件及代码说明

DemoFiles 存放可测试文件
Default.aspx 启动页
ExcelPreview.cs Excel预览类

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();
    }

PDfPreview.cs Pdf预览类

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();
    }

TextFilePreview.cs 文本文件预览类

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();
    }