如何在C＃

Question

当前正在尝试读取每行的第一个单词

while ((line = studentsReader.ReadLine()) != null)
{
    foreach (var lines in line.Split('\n'))
    {                        
        arr = line.Split(',');                      
    }
}

尝试过但没用，arr[1]仍然给我起了名字Oliver

我希望arr[0]是v12345，而arr[1]是v54321，而不是Oliver

文本文件看起来像这样：

v12345, Oliver, Queen
v54321, Barry, Allen
v51213, Tony, Stark

Answer 1

您需要将第一个单词添加到新集合中。

var arr = new List<string>();
while ((line = studentsReader.ReadLine()) != null)
{
    arr.Add(line.Split(',')[0]);
}

Answer 2

如果这是文件，则可以

var arr = File.ReadLines(<file name>).Select(l=>l.Split(',')[0]).ToList();

Answer 3

对不起。但是您的代码很混乱。

while ((line = studentsReader.ReadLine()) != null)//ReadLine reads only one line from a file, e. g. v12345, Oliver, Queen
{
    foreach (var lines in line.Split('\n'))//spiltting than single line by '\n' does nothing
    {
        /*Now you split by ',' not the iterator, which is lines,
         but an original string, which is line.
         But because you didn't actually split anything it makes no difference*/                        
         arr = line.Split(',');
         /*here you've got an array of strings {v12345, Oliver, Queen}
         On next iteration you'll read another line from a file and
         get the same array from another string, etc. And on each iteration
         the arr will be a new array, so after the last iteration you'll get
         the last line of file*/                      
    }
}

您应该执行类似的操作

List<string> firstWords = new List<string>();

while(line = studentsReader.ReadLine()!=null)
{
    firstWords.Add(line.Split(',')[0]);

}

Answer 4

数组索引从零开始。所以arr [0]会给你第一个单词。