我一直在为大学项目做这件事并且遇到了问题。我已设法从文件加载多行,但我无法将它们保存回文件。我可以将一个字符串保存到文件中,这是最后处理的字符串,但就是这样。我可能通过执行循环完全错误,但我想不出任何其他方法来做到这一点。 savefile部分的编码如下:
case "s":
case "8":
{
int savecount = 0;
string savestring = "";
//Clear the text file ready to be saved
using (FileStream fs = File.Create("billing.txt"))
{
}
while (savecount != CustomerCount)
{
using (StreamWriter save = new StreamWriter("billing.txt"))
{
//Create the string to save to the file
savestring = CustomerNumber[savecount] + ","
+ CustomerName[savecount] + ","
+ Address[savecount] + ","
+ RateScheme[savecount] + ","
+ PeakKWH[savecount] + ","
+ OffPeakKWH[savecount] + ","
+ StandardKWH[savecount];
Console.WriteLine(savestring);
save.WriteLine(savestring);
savecount++;
Console.ReadLine();
}
}
Console.WriteLine("All data saved successfully");
Console.ReadLine();
break;
}
不知道从哪里开始。任何帮助将不胜感激
答案 0 :(得分:1)
您应该在循环之前打开保存的文件。 E.g。
using (StreamWriter save = new StreamWriter("billing.txt")) {
while (savecount != CustomerCount) {
// rest of your code here
目前,您正在每个循环中打开文件,写出一行。然后重新打开它(并丢失已写入的数据)。
正如评论中所指出的,您无需致电File.Create
。默认情况下,StreamWriter
将覆盖现有文件。
答案 1 :(得分:1)
你需要using { }
内的while循环因为你每次都要覆盖你的数据,当你看到它时,将最后一项留在你的文件中:
using (StreamWriter save = new StreamWriter("billing.txt"))
{
while (savecount != CustomerCount)
{
//Create the string to save to the file
string savestring = CustomerNumber[savecount] + ","
+ CustomerName[savecount] + ","
+ Address[savecount] + ","
+ RateScheme[savecount] + ","
+ PeakKWH[savecount] + ","
+ OffPeakKWH[savecount] + ","
+ StandardKWH[savecount];
Console.WriteLine(savestring);
save.WriteLine(savestring);
savecount++;
Console.ReadLine();
}
}
答案 2 :(得分:1)
你做错了是,你在每次迭代中打开文件,在文件中写一行,然后再次重新打开文件并覆盖内容。您可以重新更改代码
using (StreamWriter save = new StreamWriter("billing.txt"))
{
while (savecount != CustomerCount)
{
// rest of string formation of saveString logic and save.WriteLine(savestring); goes here
.....
}
}
我认为您可以使用一个简单的代码,您可以将所有输入字符串保存在List中并使用File.WriteAllLines函数作为
{
....
List<string> Customers = new List<string>();
for (savecount = 0; savecount < CustomerCount; savecount++)
{
//Create the string to save to the file
Customers.Add( CustomerNumber[savecount] + "," + CustomerName[savecount] + "," + Address[savecount] + "," + RateScheme[savecount] + "," + PeakKWH[savecount] + "," + OffPeakKWH[savecount] + "," + StandardKWH[savecount]);
Console.WriteLine(Customers[savecount]);
}
string filePath = "billing.txt"; // This is your file path where all the contents are to be written
File.WriteAllLines(filePath, Customers);
..........
}
答案 3 :(得分:0)
你需要:
using (StreamWriter save = new StreamWriter("billing.txt")) {
while (savecount != CustomerCount) {
你必须在循环之前打开文件,因为打开内部会删除之前写入的所有数据,也需要一些时间才能打开。
但是你可以在循环内打开文件,但你需要设置append
文件,它将是:
StreamWriter save = new StreamWriter("billing.txt", true)
此选项较慢,您可能需要在以追加模式打开之前清除文件,因此它不是最佳选择。