如何为流阅读器设置特定路径以从中打开文件。 [英] How Do I Set A Specific Path For Stream Reader To Open A File From.

问题描述

我需要打开包含DNA密码子的文件并将其读出到列表文件中。我很确定我把它弄下来但我无法测试它，因为我无法将文件路径重定向到我想要的。我已经使用了几种不同的技术来做到这一点，但没有一种方法可行。继续我当前的设置：

I need to open a file contain in DNA codons and read it out to a list file. Im pretty sure i got it down but i can't test it because i can't redirect the file path to what i want. I've used several different techniques to do this but none have worked. Heres my current setup:

private void btnOpen_Click(object sender, EventArgs e)
       {
           string DNA; //Declares a string variable named DNA
           int Lines, Index;//Declares an integer named Lines
           DNA = @"\documents\visual studio 2013\Projects\DNA\DNA.txt";
           StreamReader DNAfile; //Declares a StreamReader Variable named DNAfile
           DNAfile = File.OpenText(DNA); //opens the file "DNA.txt" as the DNAfile Variable
           Lines = File.ReadLines("DNA.txt").Count(); //Counts the number of lines in the DNA.txt file and sets it equal to the integer "Lines"
           string[] DNAarray = new string[Lines]; //Creates an string array with the length of the number of lines in the file "DNA.txt"
           Index = 0;
           while (Index < DNAarray.Length && !DNAfile.EndOfStream)
           {
               DNAarray[Index] = DNAfile.ReadLine();
               Index++;
           }
           foreach (string value in DNAarray)
           {
               lstOut.Items.Add(DNAarray);
           }
       }

DNA字符串上的路径是正确的路径但我得到一个错误，说文件不能找到并且系统使用的路径是'\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\我把它换成了。我做错了什么？

the path on the DNA string is the correct path but i get an error saying the file can't be found and the path the system uses is '\\psf\home\documents\visual studio 2013\Projects\DNA\DNA\bin\Debug\DNA.txt' no matter what i change it to. What am i doing wrong?

推荐答案

你打开文件两次。首先使用 File.OpenText（DNA），然后使用 File.ReadLines（DNA.txt）。而后者抛出异常，因为你只指定了文件名，没有路径。



As File.ReadLines（..） [ ^ ]返回IEnumerable< string>将所有文本行包含为字符串，大部分其他代码都是不必要的。



如果 lstOut 是ListBox，您甚至可以删除foreach循环并使用 ListBox.AddRange（..） [ ^ ]添加IEnumerable< string>中的所有字符串立刻（使用.ToArray（））。

You open the file twice. First with File.OpenText(DNA), then with File.ReadLines("DNA.txt"). And the latter throws the exception because you only specified the file name, no path.

As File.ReadLines(..)[^] returns an IEnumerable<string> containing all the text-lines as strings, most of your other code is unneccessary.

If lstOut is a ListBox, you can even remove the foreach-loop and use ListBox.AddRange(..)[^] to add all strings from the IEnumerable<string> at once (with .ToArray()).

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