我很难弄清楚这个IOException。直到大约两个月前，这种方法才能完美无缺地工作。我对它所做的唯一更改是将解析的文件移动到另一个文件夹，这也工作了一段时间。现在，每次自定义 Windows 文件观察程序服务到达此方法时，我都会收到以下错误消息：
There was an Input Output file error: System.IO.IOException: The process cannot access the file '\mkfiler01opsEnvcomEXECENVCOMLabCODExportsDataLogDL_DR6000_1601329_2017-Jan-10_12_15_01.csv' because it is being used by another process.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.StreamReader..ctor(String path, Encoding encoding, Boolean detectEncodingFromByteOrderMarks, Int32 bufferSize, Boolean checkHost)
at System.IO.StreamReader..ctor(String path, Encoding encoding)
at System.IO.File.ReadLines(String path)
at COD_Automation.COD_AUTO.ParseData(String filePath)
我无法弄清楚它可能是什么过程，因为它在写入日志后一开始就崩溃了。我们的仪器创建.csv文件并将其发送到正在监视的网络文件夹位置。然后启动服务。解析是服务中发生的第一件事。我将不胜感激对此的任何帮助。
下面是解析方法的代码：
public void ParseData(String filePath)
{
Write2LogFile("The parsing of " + filePath + " has begun.");
//Create a dictionary collections with int keys (rowNums) and String values (each line of Strings)
Dictionary<int, String> eachCSVLine = new Dictionary<int, string>();
//String array that holds the contents of the specified row
String[] lineContent;
int rowNum = 1;
try
{
/*loop through each line of the csv file, add it the collection
*and iterate the row number*/
foreach (string line in File.ReadLines(filePath))
{
eachCSVLine.Add(rowNum, line);
rowNum++;
}
//Get the required line and split it by "," into an array
if (eachCSVLine.ContainsKey(5))
{
String reqLine = eachCSVLine[5];
lineContent = reqLine.Split(',');
}
else
{
String reqLine = eachCSVLine[4];
lineContent = reqLine.Split(',');
}
/*Get the required values(index 2 for parsed Operator ID, index 3 for parsed Sample Number,
* index 11 for Sample Result, index 8 for provided Dilution)*/
AnalysisInitials = lineContent.GetValue(2).ToString();
SampNum = lineContent.GetValue(3).ToString(); //sample number
String result = lineContent.GetValue(11).ToString();
String dilute = lineContent.GetValue(8).ToString();
Dilution = Double.Parse(dilute);
SampResult = Int32.Parse(result); //sample result
Write2LogFile("The following result data from " + filePath + " was just parsed: " + AnalysisInitials + "," +
SampNum + "," + Dilution.ToString() + "," + SampResult.ToString());
//move the parsed file to the parsed folder
//File.Move(filePath, parsedPath);
//Write2LogFile("The following file has been moved to the parsed folder: " + filePath);
}
catch (KeyNotFoundException ke)
{
Write2LogFile("The data elements could not be accessed from the collection because of the following: " +
ke.GetBaseException());
SendMail("The data elements could not be accessed from the collection because of the following: " + ke.GetBaseException());
}
catch (ArgumentNullException an)
{
Write2LogFile("The was a problem with looping through the " + filePath + " because of the following: " +
an.GetBaseException());
SendMail("The was a problem with looping through the " + filePath + " because of the following: " +
an.GetBaseException());
}
catch (ArgumentException ae)
{
Write2LogFile("There was a problem with looping through the " + filePath + " because of the following: " +
ae.GetBaseException());
SendMail("There was a problem with looping through the " + filePath + " because of the following: " +
ae.GetBaseException());
}
catch (InvalidCastException ce)
{
Write2LogFile("The value could not be casted or converted because of the following: " +
ce.GetBaseException());
SendMail("The value could not be casted or converted because of the following: " +
ce.GetBaseException());
}
catch (IOException ie)
{
Write2LogFile("There was an Input Output file error: " +
ie.GetBaseException());
SendMail("There was an Input Output file error: " +
ie.GetBaseException());
}
}
我认为大师在这里对您的问题有一个很好的答案：
https://stackoverflow.com/a/39142959/4619012
并从这里备份：
https://stackoverflow.com/a/39143086/4619012
这是 ReadLines（） 实现中的一个已知错误...
谢谢 Quantic。我确实更改了我的代码以包含 Using 语句（我通常使用）和文件流。它现在有效。我仍在测试该服务，但我将下面的代码部分更改为它下面的代码。
旧代码：
/*loop through each line of the csv file, add it the collection
*and iterate the row number*/
foreach (string line in File.ReadLines(filePath))
{
eachCSVLine.Add(rowNum, line);
rowNum++;
}
新代码：
/*loop through each line of the csv file, add it the collection
*and iterate the row number*/
using (FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (StreamReader reader = new StreamReader(stream))
{
string currentLine;
while ((currentLine = reader.ReadLine()) != null)
{
eachCSVLine.Add(rowNum, currentLine);
rowNum++;
}
}
}
解决方案是有道理的。只是为了我的生活，我看不出当时什么进程甚至可以控制文件，以及为什么以前没有这些问题。尽管如此，这还是有效的。再次感谢您的输入。