为什么我收到异常：ObjectDisposedException？ [英] Why i'm getting exception: ObjectDisposedException?

问题描述

这是代码：

This is the code:

FtpWebResponse response = (FtpWebResponse)reqFTP.GetResponse();
Stream responseStream = response.GetResponseStream();
StreamReader readStream = new StreamReader(responseStream, System.Text.Encoding.UTF8);
long filel = readStream.ReadToEnd().Length;
readStream.Close();
FileStream writeStream = new FileStream(ftpdirectories + "\\" + filenameonly, FileMode.Create);
string fnn = ftpdirectories + "\\" + filenameonly;
int Length = 2048;
Byte[] buffer = new Byte[Length];
int bytesRead = responseStream.Read(buffer, 0, Length);

例外如下：

The exception is on the line:

int bytesRead = responseStream.Read(buffer, 0, Length);

如果我没有使用StreamReader，并且关闭它工作正常，但是一旦我添加StreamReader我收到了异常。

If i'm not using the StreamReader the long and the Close it's working fine but once i'm adding the StreamReader i'm getting the exception.

无法访问已处理的对象。

Cannot access a disposed object.

对象名称：' System.Net.Sockets.NetworkStream'。

Object name: 'System.Net.Sockets.NetworkStream'.

 System.ObjectDisposedException was caught
      HResult=-2146232798
      Message=Cannot access a disposed object.
    Object name: 'System.Net.Sockets.NetworkStream'.
      Source=System
      ObjectName=System.Net.Sockets.NetworkStream
      StackTrace:
           at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
           at System.Net.FtpDataStream.Read(Byte[] buffer, Int32 offset, Int32 size)
           at FTP_ProgressBar.FtpProgress.DownloadFtpContent(Object sender, String file, String filesdirectories, String fn) in c:\ftp_progressbar\FTP_ProgressBar\FtpProgress.cs:line 284
      InnerException:

第284行是：

Line 284 is:

int bytesRead = responseStream.Read(buffer, 0, Length);

推荐答案

ObjectDisposedException ：操作时引发的异常是在处理过的对象上执行的。

ObjectDisposedException: The exception that is thrown when an operation is performed on a disposed object.

当您关闭 readStream

readStream.Close();

StreamReader.Close方法关闭StreamReader对象和基础流，并发布任何与读者相关的系统资源。 Close的这个实现调用Dispose方法传递一个真实值。

StreamReader.Close Method Closes the StreamReader object and the underlying stream, and releases any system resources associated with the reader. This implementation of Close calls the Dispose method passing a true value.

底层 responseStream

the underlying responseStream which is set in

StreamReader readStream = new StreamReader(responseStream, ...

关闭并关闭一个流调用的dispose方法，然后它被抛弃，之后你访问 responseStream 和boom！ ObjectDisposedException

is closed and closing a stream call dispose method and it get disposed. after that you access responseStream and boom! ObjectDisposedException

这篇关于为什么我收到异常：ObjectDisposedException？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！