文件与流

一、File与Directory

二、读取文件（StreamReader） 

 class Program
    {
        static void Main(string[] args)
        {
            //从指定盘下读取.txt文件
            string sdick=@"C:";
            string[] fileExtension={".txt"};
            if (Directory.Exists(sdick))
            {
                string[] filePath=Directory.GetFiles(sdick);
                if (filePath.Count() > 0)
                {
                    Console.WriteLine(string.Format("共获取到{0}个文件:", filePath.Count()));

                    List<FileInfo> lstFiles = new List<FileInfo>();
                    foreach (string s in filePath)
                    {                        
                        FileInfo fi = new FileInfo(s);
                        Console.WriteLine(string.Format("  文件：{0},后缀为：{1}", fi.Name,fi.Extension));

                        if (fileExtension.Contains(fi.Extension))
                        {
                            lstFiles.Add(fi);
                        }
                    }

                    string condition="";
                    fileExtension.All((file)=>{
                        condition+="["+file+"]";
                        return true;
                    });

                    Console.WriteLine(string.Format("查找到满足条件：{0}的文件有{1}个。", condition, lstFiles.Count));
        
                    //读取文件
                    if(lstFiles.Count>0)
                    {
                        foreach (FileInfo fi in lstFiles)
                        {
                            Console.WriteLine(string.Format("文件【{0}】的内容如下：", fi.Name));
                            Console.WriteLine(new string('-', 20));

                            using (StreamReader sr = new StreamReader(fi.FullName))
                            {
                                Console.WriteLine(sr.ReadToEnd());
                            }

                            Console.WriteLine("
");
                        }              
                    }
                  


                }
            }



            Console.ReadLine();
        }
    }