C# 文件

一个 文件 是一个存储在磁盘中带有指定名称和目录路径的数据集合。当打开文件进行读写时，它变成一个 流。

 

文本文件的读写

/ 创建一个 StreamReader 的实例来读取文件 
                // using 语句也能关闭 StreamReader
                using (StreamReader sr = new StreamReader("c:/jamaica.txt"))
                {
                    string line;
                   
                    // 从文件读取并显示行，直到文件的末尾 
                    while ((line = sr.ReadLine()) != null)
                    {
                        Console.WriteLine(line);
                    }
                }
            }
            catch (Exception e)
            {
                // 向用户显示出错消息
                Console.WriteLine("The file could not be read:");
                Console.WriteLine(e.Message);
            }

string[] names = new string[] {"Zara Ali", "Nuha Ali"};
            using (StreamWriter sw = new StreamWriter("names.txt"))
            {
                foreach (string s in names)
                {
                    sw.WriteLine(s);

                }
            }

            // 从文件中读取并显示每行
            string line = "";
            using (StreamReader sr = new StreamReader("names.txt"))
            {
                while ((line = sr.ReadLine()) != null)
                {
                    Console.WriteLine(line);
                }
            }
            Console.ReadKey();

 

public void PlaceOrder(List<string> dishes)
 {
 System.IO.File.WriteAllLines(@"C:\order.txt", dishes.ToArray());
 }

class XmlDataService:IDataService
    {
        public List<Dish> GetAllDishes()
        {
            List<Dish> dishList = new List<Dish>();
            string xmlFileName = System.IO.Path.Combine(Environment.CurrentDirectory, @"Data\Data.xml");
            XDocument xDoc = XDocument.Load(xmlFileName);
            var dishes = xDoc.Descendants("Dish");
            foreach(var d in dishes)
            {
                Dish dish = new Dish();
                dish.Name = d.Element("Name").Value;
                dish.Cateory = d.Element("Category").Value;
                dish.Comment = d.Element("Comment").Value;
                dish.Score =double.Parse( d.Element("Score").Value);
                dishList.Add(dish);
            }
            return dishList;
        }
    }