Stream篇（3）【StreamReader】

FileStream fs = new FileStream ( "D:\\TextReader.txt", FileMode.Open , FileAccess.Read ) ;
 StreamReader sr= new StreamReader ( fs ) ; 
 //本例中的BaseStream就是
FileStream
sr.BaseStream.Seek (0 , SeekOrigin.Begin ) ;

 1 static void Main(string[] args)
 2         {
 3            
 4             //文件地址
 5             string txtFilePath="D:\\TextReader.txt";
 6             //定义char数组
 7             char[] charBuffer2 = new char[3];
 8 
 9             //利用FileStream类将文件文本数据变成流然后放入StreamReader构造函数中
10             using(FileStream stream = File.OpenRead(txtFilePath))
11             {
12                 using (StreamReader reader = new StreamReader(stream))
13                 {
14                     //StreamReader.Read()方法
15                     DisplayResultStringByUsingRead(reader);
16                 }
17             }
18 
19             using (FileStream stream = File.OpenRead(txtFilePath))
20             {
21                 //使用Encoding.ASCII来尝试下
22                 using (StreamReader reader = new StreamReader(stream,Encoding.ASCII,false))
23                 {
24                     //StreamReader.ReadBlock()方法
25                     DisplayResultStringByUsingReadBlock(reader);
26                 }
27             }
28 
29             //尝试用文件定位直接得到StreamReader，顺便使用 Encoding.Default
30             using(StreamReader reader = new StreamReader(txtFilePath, Encoding.Default,false,123))
31             {
32                //StreamReader.ReadLine()方法
33               DisplayResultStringByUsingReadLine(reader);
34             }
35 
36             //也可以通过File.OpenText方法直接获取到StreamReader对象
37             using (StreamReader reader = File.OpenText(txtFilePath)) 
38             {
39                 //StreamReader.ReadLine()方法
40                 DisplayResultStringByUsingReadLine(reader);
41             }
42 
43             Console.ReadLine();
44         }
45 
46         /// <summary>
47         /// 使用StreamReader.Read()方法
48         /// </summary>
49         /// <param name="reader"></param>
50         public static  void DisplayResultStringByUsingRead(StreamReader reader) 
51         {
52             int readChar = 0;
53             string result = string.Empty;
54             while ((readChar=reader.Read()) != -1) 
55             {
56                 result += (char)readChar;
57             }
58             Console.WriteLine("使用StreamReader.Read()方法得到Text文件中的数据为 : {0}", result);
59         }
60 
61         /// <summary>
62         /// 使用StreamReader.ReadBlock()方法
63         /// </summary>
64         /// <param name="reader"></param>
65         public static void DisplayResultStringByUsingReadBlock(StreamReader reader)
66         {
67             char[] charBuffer = new char[10];
68             string result = string.Empty;
69             reader.ReadBlock(charBuffer,0,10);
70             for (int i = 0; i < charBuffer.Length; i++)
71             {
72                 result += charBuffer[i];
73             }
74             Console.WriteLine("使用StreamReader.ReadBlock()方法得到Text文件中前10个数据为 : {0}", result);
75         }
76 
77 
78         /// <summary>
79         /// 使用StreamReader.ReadLine()方法
80         /// </summary>
81         /// <param name="reader"></param>
82         public static void DisplayResultStringByUsingReadLine(StreamReader reader)
83         {
84             int i=1;
85             string resultString = string.Empty;
86             while ((resultString=reader.ReadLine() )!= null)
87             {
88                 Console.WriteLine("使用StreamReader.Read()方法得到Text文件中第{1}行的数据为 : {0}", resultString, i);
89                 i++;
90             }
91             
92         }