如何将文本附加到现有文本文件?

时间:2017-06-08 19:32:03

标签: c# winforms textbox

我写了一个应用程序,要求用户提供他们所住的酒店的一些细节,并且文本很幸运地被添加,但如果我添加另一个人,它将覆盖文件中已存在的先前数据。但是,我希望它能保留所有数据输入。

这是我的代码:

hotelName = txt_HotelName.Text;

ratings = txt_HotelRating.Text;
roomsNeeded = txt_RoomsNeeded.Text;
name = txt_UserName.Text;
surname = txt_UserLastname.Text;
contactDetails = txt_ContactDetail.Text;
paymentDetails = txt_PaymentMehthod.Text;
paymentDate = txt_PaymentDate.Text;

using (StreamWriter sw = new StreamWriter("HotelDocument.txt"))
{
    sw.WriteLine(txt_HotelName + Environment.NewLine + txt_HotelRating + Environment.NewLine + txt_RoomsNeeded +
        Environment.NewLine + txt_UserName + Environment.NewLine + txt_UserLastname + Environment.NewLine + txt_ContactDetail +
        Environment.NewLine + txt_PaymentMehthod + Environment.NewLine + txt_PaymentDate);
}

MessageBox.Show($"Thank you for using our system {txt_UserName.Text}.", "Thank you", MessageBoxButtons.OK);

所以我想要的是收集所有数据,而不是每次都重写。

2 个答案:

答案 0 :(得分:1)

尝试追加文件:

  string line = string.Join(Environment.NewLine, new string[] {
    ratings, 
    roomsNeeded, 
    name, 
    surname, 
    contactDetails, 
    paymentDetails, 
    paymentDate});

  File.AppendAllLines("HotelDocument.txt", new string[] {line});

编辑如果你想整理输入数据,我建议使用字符串插值 C#6.0 )或格式化

  string line = string.Join(Environment.NewLine, new string[] {
    $"Ratings: {ratings}", 
    $"Rooms need: {roomsNeeded}", 
    $"Name: {name}", 
    $"Surname: {surname}", 
    $"Details: {contactDetails}", 
    $"Payment: {paymentDetails}", 
    $"Payment Date: {paymentDate}");

答案 1 :(得分:0)

您需要指定一个唯一名称:

 using (StreamWriter sw = new StreamWriter("HotelDocument.txt"))

因此,而不是“HotelDocument.txt”可能使用当前DateTime,甚至new Guid()是100%唯一。如下所示:

var uniqueFileName = new Guid().ToString() + ".txt";
using (StreamWriter sw = new StreamWriter(uniqueFileName))

或者您是否希望在现有的HotelDocument.txt中添加新数据?