将竖的形式的数字转化为以逗号隔开的形式，要求只筛选出不重复的形式。

class Program
{
static void Main(string[] args)
{
string rpath;     //读取文件的路径
string wpath;     //写文件的路径
string readstring;  //读取的文本
string[] stringarray ;  //将文本转换为数组
string laststring;     //最后需要的文本

rpath = "D:\\a.txt";
wpath = "d:\\b.txt";
readstring = ReaderText(rpath);
stringarray = readstring.Split(',');
laststring = DeleteSame(stringarray);
WriteText(wpath,laststring);
Console.WriteLine("Translate Successfully");
Console.ReadKey();
}
//从文件中读取数据
public static string ReaderText(string path)
{
string s = "";
try
{
using (StreamReader sr = new StreamReader(path))
{
string line;
while ((line = sr.ReadLine()) != null)
{
//Console.WriteLine(line);
s = s + line + ','; ;

}
s = s.Remove(s.Length - 1);//将最后一个逗号移除
}
}
catch (Exception e)
{
Console.WriteLine("The file could not be read");
Console.WriteLine(e.Message);
}
return s;
}

//移除相同的数据
public static string DeleteSame(string[] stringarry)
{
List<string> liststring = new List<string>();
foreach (string eachstring in stringarry)
{
if (!liststring.Contains(eachstring))
{
liststring.Add(eachstring);
}
}
string laststring = "";
foreach (string eachstring in liststring)
{
laststring = laststring + eachstring + ',';
}
return laststring.Remove(laststring.Length - 1);
}

//写入文件
public static void WriteText(string wpath,string data)
{
try
{
using (StreamWriter sw = new StreamWriter(wpath))
{
sw.Write(data);
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}