这个问题在这里已有答案：
我正在尝试创建一个C＃应用程序，它从.txt文件中读取和输出信息，然后允许用户在该文件的末尾输入更多信息。我试图以CSV格式编写文本文件，并且我在确定如何添加到文件的BOTTOM时遇到了很多麻烦。看来，当我尝试时，它会覆盖文件的顶行。任何帮助表示赞赏。到目前为止，这是代码，对于任何令人困惑的线路 - 我一直在尝试许多不同的东西，我可以在网上找到尝试让它工作。
class Program
{
static void Main(string[] args)
{
string UIName = "";
string UIInvoice = "";
string UIDue = "";
string UIAmount = "";
using (FileStream fs = new FileStream(@"C:\Accounts.txt", FileMode.Open))
using (StreamReader sr = new StreamReader(fs))
{
string content = sr.ReadToEnd();
string[] lines = content.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
int lineCount = 0;
List<Account> accounts = new List<Account>();
foreach (string line in lines)
{
string[] column = line.Split(',');
if (lineCount != 0)
{
Account account = new Account();
account.AccountName = column[0];
account.InvoiceDate = column[1];
account.DueDate = column[2];
account.AmountDue = column[3];
accounts.Add(account);
}
lineCount++;
}
Console.WriteLine(content);
}
using (FileStream fs = new FileStream(@"C:\Accounts.txt", FileMode.OpenOrCreate))
using (StreamWriter sw = new StreamWriter(fs))
{
Account account = new Account();
account.AccountName = UIName;
account.InvoiceDate = UIInvoice;
account.DueDate = UIDue;
account.AmountDue = UIAmount;
//accounts.Add(account);
string fullText = (UIName + "," + UIInvoice + "," + UIDue + "," + UIAmount);
Console.WriteLine("Would you like to enter additional data?");
Console.WriteLine("Please enter the Account Name: ");
UIName = Console.ReadLine();
Console.WriteLine("Please enter the Invoice Date: ");
UIInvoice = Console.ReadLine();
Console.WriteLine("Please enter the Due Date: ");
UIDue = Console.ReadLine();
Console.WriteLine("Please enter the AmountDue: ");
UIAmount = Console.ReadLine();
File.AppendAllText("C:/Accounts.txt", fullText + Environment.NewLine);//can't get this way working, even after switching "\"s to "/"s. It says that the file is being used by another process.
Console.ReadLine();
}
}
}
}
单独课程：
public class Account
{
public string AccountName { get; set; }
public string InvoiceDate { get; set; }
public string DueDate { get; set; }
public string AmountDue { get; set; }
public static string GetAccountCSV(Account account)
{
string returnValue = account.AccountName + "," + account.InvoiceDate + "," + account.DueDate + "," + account.AmountDue;
return returnValue;
}
}
.txt文件说;
Account Name,Invoice Date,Due Date,Amount Due
Jane Doe,1/12/2017,2/12/2017,2000.00
Gonuts Inc,12/31/2017,2/28/2017,1566.50
您的代码存在多个问题。
FileStream模式打开OpenOrCreate。 OpenOrCreate模式将文件指针放在文件的开头。因此，无论您写入文件，它都会覆盖文件的现有内容。FileStream和StreamWriter但不要使用它们将内容写入文件。而不是File.AppendAllText你应该使用sw.WriteLine(fullText)。您还要将文件内容写入代码中的错误位置。
以下是删除了上述所有问题的代码。
static void Main(string[] args)
{
string UIName = "";
string UIInvoice = "";
string UIDue = "";
string UIAmount = "";
var filePath = @"D:\Accounts.txt";
using (FileStream fs = new FileStream(filePath, FileMode.OpenOrCreate))
{
using (StreamReader sr = new StreamReader(fs))
{
string content = sr.ReadToEnd();
string[] lines = content.Split(new string[] {Environment.NewLine},
StringSplitOptions.RemoveEmptyEntries);
int lineCount = 0;
List<Account> accounts = new List<Account>();
foreach (string line in lines)
{
string[] column = line.Split(',');
if (lineCount != 0)
{
Account account = new Account();
account.AccountName = column[0];
account.InvoiceDate = column[1];
account.DueDate = column[2];
account.AmountDue = column[3];
accounts.Add(account);
}
lineCount++;
}
Console.WriteLine(content);
}
}
using (FileStream fs = new FileStream(filePath, FileMode.Append))
{
using (StreamWriter sw = new StreamWriter(fs))
{
Account account = new Account();
account.AccountName = UIName;
account.InvoiceDate = UIInvoice;
account.DueDate = UIDue;
account.AmountDue = UIAmount;
//accounts.Add(account);
Console.WriteLine("Would you like to enter additional data?");
Console.WriteLine("Please enter the Account Name: ");
UIName = Console.ReadLine();
Console.WriteLine("Please enter the Invoice Date: ");
UIInvoice = Console.ReadLine();
Console.WriteLine("Please enter the Due Date: ");
UIDue = Console.ReadLine();
Console.WriteLine("Please enter the AmountDue: ");
UIAmount = Console.ReadLine();
string fullText = (UIName + "," + UIInvoice + "," + UIDue + "," + UIAmount);
sw.WriteLine(fullText);
Console.ReadLine();
}
}
}
您的代码有两个问题
请在下面找到工作程序类文件
class Program
{
static void Main(string[] args)
{
string UIName = "";
string UIInvoice = "";
string UIDue = "";
string UIAmount = "";
using (FileStream fs = new FileStream(@"C:/Accounts.txt", FileMode.Open))
using (StreamReader sr = new StreamReader(fs))
{
string content = sr.ReadToEnd();
string[] lines = content.Split(new string[] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
int lineCount = 0;
List<Account> accounts = new List<Account>();
foreach (string line in lines)
{
string[] column = line.Split(',');
if (lineCount != 0)
{
Account account = new Account();
account.AccountName = column[0];
account.InvoiceDate = column[1];
account.DueDate = column[2];
account.AmountDue = column[3];
accounts.Add(account);
}
lineCount++;
}
Console.WriteLine(content);
}
using (FileStream fs = new FileStream(@"C:/Accounts.txt", FileMode.Append))
using (StreamWriter sw = new StreamWriter(fs))
{
Account account = new Account();
account.AccountName = UIName;
account.InvoiceDate = UIInvoice;
account.DueDate = UIDue;
account.AmountDue = UIAmount;
//accounts.Add(account);
Console.WriteLine("Would you like to enter additional data?");
Console.WriteLine("Please enter the Account Name: ");
UIName = Console.ReadLine();
Console.WriteLine("Please enter the Invoice Date: ");
UIInvoice = Console.ReadLine();
Console.WriteLine("Please enter the Due Date: ");
UIDue = Console.ReadLine();
Console.WriteLine("Please enter the AmountDue: ");
UIAmount = Console.ReadLine();
string fullText = (UIName + "," + UIInvoice + "," + UIDue + "," + UIAmount);
File.AppendAllText("C:/Accounts.txt", fullText + Environment.NewLine);//can't get this way working, even after switching "\"s to "/"s. It says that the file is being used by another process.
Console.ReadLine();
}
}
}