所以我正在开发一个C＃程序，它在目录中接受一组分隔的文本文件，并解析文件中的信息（即文件路径，文件名，关联的关键字）。这就是示例文件的样子......
C:\Documents and Settings\workspace\Extracted Items\image2.jpeg;image0;keyword1, keyword2, keyword3, keyword4
C:\Documents and Settings\workspace\Extracted Items\image3.jpeg;image1;keyword1, keyword2, keyword3, keyword4
C:\Documents and Settings\workspace\Extracted Items\image4.jpeg;image2;keyword1, keyword2, keyword3, keyword4
C:\Documents and Settings\workspace\Extracted Items\image5.jpeg;image3;keyword1, keyword2, keyword3, keyword4
我的伙伴给了我一些代码来执行此操作，但我需要能够访问列表变量，该变量填充在其中一个方法中。这是代码：
using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApp
{
public class FileIO
{
private static Boolean isTextFile;
private static Boolean debug;
private static int semiColonLoc1, semiColonLoc2, dblQuoteLoc1;
private static int lineLength, currentTagLength;
private static int numImages;
private static int numFiles;
public static List<Image> lImageSet;
/*
****************************************************
***** CHANGE THIS PATH TO YOUR PROPERTIES FILE *****
****************************************************
*/
private static readonly string propertiesFileDir = "C:/Documents and Settings/properties.properties";
public PropertyKeys getProperties(string propertiesFileDir, PropertyKeys aPropertyKeys)
{
string line;
string directoryKey = "extractedInfoDirectory";
string debugKey = "debug2";
string directory;
Boolean isDirectoryKey;
Boolean isDebugKey;
System.IO.StreamReader file = new System.IO.StreamReader(propertiesFileDir);
while ((line = file.ReadLine()) != null)
{
isDirectoryKey = false;
isDebugKey = false;
// If the current line is a certain length, checks the current line's key
if (line.Length > debugKey.Length)
{
isDebugKey = line.Substring(0, debugKey.Length).Equals(debugKey, StringComparison.Ordinal);
if (line.Length > directoryKey.Length)
{
isDirectoryKey = line.Substring(0, directoryKey.Length).Equals(directoryKey, StringComparison.Ordinal);
}
}
// Checks if the current line's key is the extractedInfoDirectory
if (isDirectoryKey)
{
directory = line.Substring(directoryKey.Length + 1);
aPropertyKeys.setExtractedInfoDir(directory);
}
// Checks if the current line's key is the debug2
else if (isDebugKey)
{
debug = Convert.ToBoolean(line.Substring(debugKey.Length + 1));
aPropertyKeys.setDebug(debug);
}
}
return aPropertyKeys;
}
public void loadFile()
{
string line;
string tempLine;
string fileToRead;
string fileRename;
string imagePath, imageName, imageTags, currentTag;
string extractedInfoDir;
string extension;
string textfile = "txt";
string[] filePaths;
PropertyKeys aPropertyKeys = new PropertyKeys();
// Finds extractedInfoDir and debug values
aPropertyKeys = getProperties(propertiesFileDir, aPropertyKeys);
extractedInfoDir = aPropertyKeys.getExtractedInfoDir();
debug = aPropertyKeys.getDebug();
// Finds all files in the extracted info directory
filePaths = Directory.GetFiles(extractedInfoDir);
numFiles = filePaths.Length;
// For each file in the directory...
for (int n = 0; n < numFiles; n++)
{
int k = filePaths[n].Length;
// Finds extension for the current file
extension = filePaths[n].Substring(k - 3);
// Checks if the current file is .txt
isTextFile = extension.Equals(textfile, StringComparison.Ordinal);
// Only reads file if it is .txt
if (isTextFile == true)
{
fileToRead = filePaths[n];
Console.WriteLine(fileToRead);
System.IO.StreamReader file = new System.IO.StreamReader(fileToRead);
// Reset variables and create a new lImageSet object
lImageSet = new List<Image>();
line = ""; tempLine = ""; imagePath = ""; imageName = ""; imageTags = ""; currentTag = "";
semiColonLoc1 = 0; semiColonLoc2 = 0; dblQuoteLoc1 = 0; lineLength = 0; currentTagLength = 0; numImages = 0;
while ((line = file.ReadLine()) != null)
{
// Creates a new Image object
Image image = new Image();
numImages++;
lineLength = line.Length;
// Finds the image path (first semicolon delimited field)
semiColonLoc1 = line.IndexOf(";");
imagePath = line.Substring(0, semiColonLoc1);
image.setPath(imagePath);
tempLine = line.Substring(semiColonLoc1 + 1);
// Finds the image name (second semicolon delimited field)
semiColonLoc2 = tempLine.IndexOf(";");
imageName = tempLine.Substring(0, semiColonLoc2);
image.setName(imageName);
tempLine = tempLine.Substring(semiColonLoc2 + 1);
// Finds the image tags (third semicolon delimited field)
imageTags = tempLine;
dblQuoteLoc1 = 0;
// Continues to gather tags until there are none left
while (dblQuoteLoc1 != -1)
{
dblQuoteLoc1 = imageTags.IndexOf("\"");
imageTags = imageTags.Substring(dblQuoteLoc1 + 1);
dblQuoteLoc1 = imageTags.IndexOf("\"");
if (dblQuoteLoc1 != -1)
{
// Finds the next image tag (double quote deliminated)
currentTag = imageTags.Substring(0, dblQuoteLoc1);
currentTagLength = currentTag.Length;
// Adds the tag to the current image
image.addTag(currentTag);
image.iNumTags++;
imageTags = imageTags.Substring(dblQuoteLoc1 + 1);
}
}
// Adds the image to the current image set
lImageSet.Add(image);
}
// Prints out information about what information has been stored
if (debug == true)
{
Console.WriteLine("Finished file " + (n + 1) + ": " + filePaths[n]);
for (int i = 0; i < numImages; i++)
{
Console.WriteLine();
Console.WriteLine("***Image " + (i + 1) + "***");
Console.WriteLine("Name: " + lImageSet.ElementAt(i).getName());
Console.WriteLine("Path: " + lImageSet.ElementAt(i).getPath());
Console.WriteLine("Tags: ");
for (int j = 0; j < lImageSet.ElementAt(i).iNumTags; j++)
{
Console.WriteLine(lImageSet.ElementAt(i).lTags.ElementAt(j));
}
}
}
file.Close();
// Changes destination file extension to .tmp
fileRename = fileToRead.Substring(0, fileToRead.Length - 4);
fileRename += ".tmp";
// Changes file extension to .tmp
System.IO.File.Move(fileToRead, fileRename);
}
// Not a text file
else
{
Console.WriteLine("Skipping file (no .txt extension)");
}
}
Console.ReadLine();
}
}
}
但是，我不想过多地乱用他的代码，因为他暂时不在这里解决任何问题。所以我只想知道如何从我的另一个类中的代码中访问lImageSet。我希望它会像FileIO fo = new FileIO实例化FileIO，然后像fo.loadFile().lImageSet这样做，但事实并非如此。有什么想法吗？
答案 0 :(得分：3)
由于lImageSet是静态的，因此您只需执行以下操作：
List<image> theList = FileIO.lImageSet;
不需要实例化对象来获取对该字段的引用。
答案 1 :(得分：2)
该列表是静态的，因此您可以使用该类的名称访问它：
List<Image> theList = FileIO.lImageSet
答案 2 :(得分：2)
loadFile方法返回void，因此您无法使用点运算符从中访问任何内容。你会想做这样的事情：
FileIO fo = new FileIO();
fo.loadFile();
List<Image> theImages = FileIO.lImageSet;
答案 3 :(得分：1)
它是公开的 - 因此，从您的课程中，您只需访问它：
FileIO.lImageSet
要获取其中的值，只需将其迭代为：
//from FishBasketGordo's answer - load up the fo object
FileIO fo = new FileIO();
fo.loadFile();
foreach(var img in FileIO.lImageSet) {
//do something with each img item in lImageSet here...
}
编辑：我建立在FishBasketGordo的答案之上，将loadFile()调用合并到我的样本中。
答案 4 :(得分：1)
因为lImageSet是static，所以您不需要实例化FileIO来获取它。
尝试FileIO.lImageSet