c＃将变量保存到csv问题

Question

我想创建一个.csv文件，其中包含我从其他文件中找到并复制的一些数据。我用行变量格式化csv。问题是5和6值被跳到下一行。我做错了什么？

Cols名称很好，但是后来脚本出了问题，不确定在哪里以及为什么。

col1         col2 col3 col4 col5 col6 col7
filename      a1   a2   a3   a4   a5   a6

但相反我回忆道：

col1         col2 col3 col4 col5 col6 col7
filename      a1   a2   a3    a4 
                   a5   a6

我的代码如下所示：

string getDir = Directory.GetCurrentDirectory();

DirectoryInfo d = new DirectoryInfo(@getDir + "\\src");
FileInfo[] Files = d.GetFiles("*.txt"); 
string str = "";
foreach(FileInfo file in Files )
{
  str = str + "," + file.Name;            
}

string lines="col1," + "col2," + "col3," + "col4 ," + "col5," + "col6," + "\n";

int ncheck = 1; 
int countFiles = d.GetFiles().Length; 

int vcheck = 0; 



    while (ncheck <= /*countFiles*/1) 
    {
        var getfile = str.Split(',')[ncheck];
        lines = lines + getfile;    
        while ( vcheck <= 4) 
        {
        string startSTR = "a1,a2,a3,a4,a5";
        var starts = startSTR.Split(',')[vcheck];

        string endSTR = "b1,b2,b3,b4,b5";
        var ends = endSTR.Split(',')[vcheck];


        string St = System.IO.File.ReadAllText(d + "\\" + getfile);

        int pFrom = St.IndexOf(starts) + starts.Length;
        if (St.IndexOf(starts) == -1 || St.IndexOf(ends) == -1) {pFrom=0;};
        int pTo = St.LastIndexOf(ends);
        if (St.IndexOf(starts) == -1 || St.IndexOf(ends) == -1) {pTo=pFrom+0;};




        String result = St.Substring(pFrom, pTo - pFrom);
        if (St.IndexOf(starts) == -1 || St.IndexOf(ends) == -1) {result="Brak danych";};

        /*Console.WriteLine(starts);
        Console.WriteLine(result);          
        Console.WriteLine(ends);*/
        Console.WriteLine(lines);
        lines = lines + "," + result;
        Console.WriteLine(lines);
        vcheck++;
        }
        lines = lines + "\n";
        ncheck++;
        vcheck=0;
    }

System.IO.StreamWriter filetxt = new System.IO.StreamWriter(@getDir + "\\test.csv");
filetxt.WriteLine(lines);

filetxt.Close();