当我尝试写入列表时，我的上一个文本被覆盖

Question

（Books类是在此代码之外定义的。）所以当我尝试从该文件读取一本书时，我只得到这本书。每当我添加一个新的老版本时，它都会被写下来。所以我无法将新书添加到我的myLibraryBooks列表中，因为它会被自动覆盖。

Books book = new Books(); 

Console.Write("Enter Author Name:"); 
book.Author = Console.ReadLine(); 

Console.Write("Enter Book Title:"); 
book.Title = Console.ReadLine(); 

Console.Write("Enter Book ISBN:"); 
book.ISBN = Console.ReadLine(); 

Console.Write("Enter the Publish Date:"); 
book.Publish_Date = Console.ReadLine(); 

myLibraryBooks.Add(new Books() { Author = book.Author.ToUpper(), Title = book.Title.ToUpper(), ISBN = book.ISBN, Publish_Date = book.Publish_Date.ToUpper() }); 
Console.WriteLine("Book added Successfully"); 
sw.Write(book.Author, FILE_PATH); 
sw.Write("\r\n", FILE_PATH); 
sw.Write(book.Title.ToUpper(), FILE_PATH); 
sw.Write("\r\n", FILE_PATH); 
sw.Write(book.ISBN.ToUpper(), FILE_PATH); 
sw.Write("\r\n", FILE_PATH); 
sw.Write(book.Publish_Date.ToUpper(), FILE_PATH); 
sw.Write("\r\n", FILE_PATH); 
sw.WriteLine(book.Author, FILE_PATH); 
sw.Close(); 

Answer 1

我在这里假设很多，但我想尝试给出一个答案。

如果sw是一个StreamWriter（我不能看到声明），那么你应该

using(StreamWriter sw = new StreamWriter("yourFile", true)) 

打开它迫使StreamWriter的追加到当前的数据，而不是将其覆盖

See MSDN StreamWriter constructors

还有sw.Write呼叫是错误的。您正在使用带格式字符串的重载和要插入格式字符串的对象。相反，您只需编写书籍的属性即可。

您应该使用

sw.WriteLine(book.Author); 

有一个单独的行每个属性，而不是在一个行togheter贴。