Question

我可以获取最新的文件信息属性

 var Filepath  =    directory.GetFiles("myPattern").OrderByDescending(f => f.LastWriteTime).First();

HttpPostedFile myFile = Filepath;

如何阅读此文件的内容？错误：无法将文件信息转换为文件下面是具有属性的类文件我试图将最新文件分配给下面的类文件。 HttpPostedFile myFile = Fileupload1.postedfile; //不抛错误 HttpPostedFile myFile = Filepath; //投掷错误错误：无法将文件信息转换为文件

public sealed class HttpPostedFile 
{ 
// Summary: 
// Gets the size of an uploaded file, in bytes. 
// 
// Returns: 
// The file length, in bytes. 
public int ContentLength { get; } 
// 
// Summary: 
// Gets the MIME content type of a file sent by a client. 
// 
// Returns: 
// The MIME content type of the uploaded file. 
public string ContentType { get; } 
// 
// Summary: 
// Gets the fully qualified name of the file on the client. 
// 
// Returns: 
// The name of the client's file, including the directory path. 
public string FileName { get; } 
// 
// Summary: 
// Gets a System.IO.Stream object that points to an uploaded file to prepare 
// for reading the contents of the file. 
// 
// Returns: 
// A System.IO.Stream pointing to a file. 
public Stream InputStream { get; } 

// Summary: 
// Saves the contents of an uploaded file. 
// 
// Parameters: 
// filename: 
// The name of the saved file. 
// 
// Exceptions: 
// System.Web.HttpException: 
// The System.Web.Configuration.HttpRuntimeSection.RequireRootedSaveAsPath property 
// of the System.Web.Configuration.HttpRuntimeSection object is set to true, 
// but filename is not an absolute path. 
public void SaveAs(string filename); 
}

Answer 1

FileInfo类和文件内容之间存在差异。您可以使用StreamReader方法通过FileInfo.OpenText访问文件的内容。

var fileInfo = directory.GetFiles("myPattern")
                        .OrderByDescending(f => f.LastWriteTime)
                        .First();
using (StreamReader sr = fileInfo.OpenText()) {
    String s = sr.ReadToEnd();
}

Answer 2

假设您正在阅读文本文件

  String text = File.ReadAllText(Directory.GetFiles("myPattern").OrderByDescending(f => File.GetLastAccessTime(f)).First());

Answer 3

Filepath是FileInfo对象，您无法将其设置为HttpPostedFile

FileInfo file =    directory.GetFiles("myPattern").OrderByDescending(f => f.LastWriteTime).First();
if (file != null)
   string contents = File.ReadAllText(file.FullName);

Answer 4

我通过以下代码获得了所需的解决方案：

var myFile = Directory.GetFiles（＆＃34;。＆＃34;）。OrderByDescending（f =＆gt; F）.FirstOrDefault（）;

如何从C＃目录中读取最新文件

4 个答案: