C#学习笔记-stream，win8.1开发小记

流用于对IO处理

在System.IO名称空间中有以下类

BinaryReader/Writer

TextReader/Writer

Stream

其中类Stream为抽象类。由此有三个派生类：

MemoryStream：对内存进行读取与写入

BufferedStream：对缓冲器进行读取/写入

FileStream：对文件执行读取与写入

TextReader/Writer为抽象类。由此派生类：

StreamReader/StreamWirter

StringReader/StreamWriter

需要引入命名空间:

using System.IO

内存流与缓冲的使用举例： 

MemoryStream memStream=new MemoryStream(); 

BufferedStream bufStream=new BufferedStream(memStream); 

byte[] b=new byte[10]; 

for(int i=0;i<10;i++) 

{ 

bufStream.WriteByte((byte)i); 

} 

bufStream.Position=0; 

bufStream.Read(b,0,9); 

for(int i=0;i<10;i++) 

{ 

Console.WriteLine("读的值是：{0}",b[i]); 

} 

Console.WriteLine("值是：{0}",bufStream.ReadByte()); 

Console.ReadLine();

文件流的使用 

string s=Console.ReadLine(); 

FileStream fileStream=new FileStream(s,FileMode.OpenOrCreate); 

BinaryWriter binStream=new BinaryWriter (fileStream); 

for(int i=1;i<=10;i++) 

{ 

binStream.Write((int)i); 

} 

binStream.Close(); 

fileStream.Close(); 

FileStream f=new FileStream(s,FileMode.Open,FileAccess.Read,FileShare.ReadWrite); 

BinaryReader buf=new BinaryReader(f); 

for(int i=1;i<10;i++) 

{ 

Console.WriteLine("输出{0}",buf.ReadByte ()); //在vs2012中这样不能读出东西来

Console.WriteLine("输出{0}",Bur.ReadInt32());才行，因为int是32位的

}

文本流的使用 

string fileName,s; 

fileName=Console.ReadLine(); 

StreamWriter fn=new StreamWriter(fileName,true); 

for(int i=1;i<10;i++) 

{ 

s=Console.ReadLine(); 

fn.WriteLine(s); 

} 

fn.Close(); 

StreamReader fr=new StreamReader(fileName); 

for(int i=1;i<10;i++) 

{ 

s=fr.ReadLine(); 

Console.WriteLine(s); 

} 

fr.Close(); 

Console.ReadLine();

C#开发win8.1程序可以利用stackPane实现同一个位置多个控件的交替

 private void delete_Click(object sender, RoutedEventArgs e)
        {
            database.delete(myCorrectWindows.affair);
            enter.Visibility = Visibility.Collapsed;
            cancel.Visibility = Visibility.Collapsed;
            correct.Visibility = Visibility.Collapsed;
            delete.Visibility = Visibility.Collapsed;
            words.Visibility = Visibility.Visible;
            dragon_image.Visibility = Visibility.Collapsed;
            correct_window.Children.Clear();
            affair_list.Items.Clear();
            var items = database.query(myDate.Year, myDate.Month, myDate.Day);
            foreach (var item in items)
            {
                MyItem myItem = new MyItem(item);
                myItem.DoubleTapped += click_listener;
                affair_list.Items.Add(myItem);
            }
        }

主要是通过设置visibility属性，并且通过数据库查询到控件添加

利用linq对数据库的数据进行排序

 private void sort_by_import_Click(object sender, RoutedEventArgs e)
        {
            SQLite.TableQuery<Affair> items;
            if (bundle.mode_num == 0)
                items = database.query(bundle.date.Year);
            else
                items = database.query(bundle.date.Year, bundle.date.Month);
            items = from x in items
                    orderby x.importance
                    select x;
            affair_list.Items.Clear();
            foreach (var item in items)
            {
                var temp = new MyItem(item);
                temp.DoubleTapped += click_to_correct;
                affair_list.Items.Add(temp);
            }
        }