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);elseitems = database.query(bundle.date.Year, bundle.date.Month);items = from x in itemsorderby x.importanceselect 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);}}

 

转载于:https://www.cnblogs.com/tjullin-251249/p/4495220.html

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