3月3号 阶段性考试 IO

1 1、
 2 [code]
 3 using System;
 4 using System.Collections.Generic;
 5 using System.IO;
 6 using System.Linq;
 7 using System.Text;
 8 using System.Threading.Tasks;
 9 
10 namespace PictureMerge
11 {
12     class Program
13     {
14         static void Main(string[] args)
15         {
16             using (Stream stream1 = File.Open(@"g:\a.jpg", FileMode.Open)) 
17             using (Stream stream2 = File.Open(@"g:\b.jpg", FileMode.Open)) 
18             using (Stream stream3 = File.Open(@"f:\c.jpg", FileMode.Create)) 
19             {
20                 byte[] bytes = new byte[1024 * 1024];//设定一个缓存为1Mb的字节数组
21                 int len;
22                 while ((len = stream1.Read(bytes,0,bytes.Length)) > 0)
23                 {
24                     stream3.Write(bytes, 0, len);
25                 }
26                 while ((len = stream2.Read(bytes, 0, bytes.Length)) > 0)
27                 {
28                     stream3.Write(bytes, 0, len);
29                 }
30  
31             }
32             Console.WriteLine("已合并！");
33             Console.ReadKey();
34         }
35     }
36 }[/code]

2，
[code]
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CopyJpgConvertToBmp
{
    class Program
    {
        static void Main(string[] args)
        {
            string DestDir = @"f:\";
            string[] JpgFiles = Directory.GetFiles(@"g:\","*jpg");
            foreach (string JpgFile in JpgFiles)
            {
                string FileName = Path.GetFileNameWithoutExtension(JpgFile);
                string DestFileName = DestDir + @"\" + FileName + ".bmp";
                //File.Copy(JpgFile, DestFileName);//File.Copy是系统内置的，，也可以自己写方法CopyFile如下
                CopyFile(JpgFile, DestFileName);
            }
            Console.WriteLine("完成");
            Console.ReadKey();
        }
        /// <summary>
        /// 将一个文件拷贝到另一个文件中去
        /// </summary>
        /// <param name="srcFile">源文件</param>
        /// <param name="destFile">目标文件</param>
        public static void CopyFile(string srcFile,string destFile)
        {
            using(Stream src=File.Open(srcFile,FileMode.Open))
            using(Stream dest=File.Open(destFile,FileMode.Create))
            {
                byte[] bytes = new byte[1024 * 1024];//设置缓存大小
                int len;
                while ((len = src.Read(bytes, 0, bytes.Length)) > 0)
                {
                    dest.Write(bytes, 0, len);
                }
            }
        }
    }
}
[/code]

3、
[code]
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CountDigital
{
    class Program
    {
        static void Main(string[] args)
        {
            using (Stream stream = File.OpenRead(@"g:\1.txt"))
            using (StreamReader reader = new StreamReader(stream,Encoding.Default))//使其以一种特定的编码从字节流中读取字符
            {
                int count = 0;
                int i;
                while(( i=reader.Read())!=-1)//char的最小值是0..-1说明已经读取完了char
                {
                    char c=(char)i;
                    if (c >= '0' && c <='9')
                    {
                        count++;
                    }
                    Console.WriteLine(c);
                }
                Console.WriteLine("其中数字的个数是" + count);
            }
            Console.ReadKey();
        }
    }
}
[/code]

4、
[code]
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace StudentScoreCheck
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("请输入查询的姓名：");
            string NameToQuery = Console.ReadLine();
            bool IsFound = false;
            using(Stream streamStu=File.OpenRead(@"g:\10.txt"))
            using (StreamReader reader = new StreamReader(streamStu, Encoding.Default))
            {
                string line;
                while ((line = reader.ReadLine()) != null)
                {
                    string[] strs = line.Split(' ');
                    if (string.IsNullOrEmpty(NameToQuery))//返回结果: 
                    //     如果 value 参数为 null 或空字符串 ("")，则为 true；否则为 false。
                    {
                        Console.WriteLine(strs[0] + "的成绩是" + strs[1]);
                    }
                    else
                    {
                        if (strs[0] == NameToQuery)
                        {
                            IsFound = true;//重新赋值为true
                            Console.WriteLine(strs[0] + "的成绩是" + strs[1]);
                            break;
                        }
                    }
                }
            }
            if (IsFound == false)
            { Console.WriteLine("！！！没有找到" + NameToQuery + "的记录！！！"); }
            Console.ReadKey();
        }
    }
}
[/code]