本文介绍了为file.txt添加值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
您好,我有这段代码,这在我的Student.txt中添加了一行,但是,每次我编译并运行该代码时,它都会再次执行.我可以添加什么代码,以使新记录仅添加一次?
Hi, I have this code, which adds a line into my Students.txt, however, everytime I compile and run the code, it does it again. What code can I add so that the new record is only added once?
string newLastName = "'Constant";
string newRecord = "(LIST (LIST 'Constant 'Malachi 'D ) '1234567890 'mdconstant@mail.usi.edu 4.000000 )";
string line;
string lastName;
bool insertionPointFound = false;
for (int i = 0; i < lines.Count && !insertionPointFound; i++)
{
line = lines[i];
if (line.StartsWith("(LIST (LIST "))
{
values = line.Split(" ".ToCharArray());
lastName = values[2];
if (newLastName.CompareTo(lastName) < 0)
{
lines.Insert(i, newRecord);
insertionPointFound = true;
}
}
}
if (!insertionPointFound)
{
lines.Add(newRecord); //This record is always added, making the file longer over time
//if it is not deleted each time from the Students.txt file in
} //the bin folder.
File.WriteAllLines("Students.txt", lines);
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