无为清净楼资源网 Design By www.qnjia.com
很多时候,我们总是按照行的方式访问文本文件,使用foreach语句能够极大地简化访问逻辑:例如:
foreach (string line in new LineReader(”c:\abc.txt”))
Console.WriteLine(line);
完整代码如下:
using System;
using System.IO;
using System.Text;
using System.Collections;
namespace Forks.Utils.IO
{
public struct LineReader : IDisposable
{
public LineReader(string file, Encoding encoding) : this(file, encoding, false)
{
}
public LineReader(string file, Encoding encoding, bool ignoreBlankLines) : this(new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read), encoding, ignoreBlankLines)
{
}
public LineReader(Stream stream, Encoding encoding) : this(stream, encoding, false)
{
}
public LineReader(Stream stream, Encoding encoding, bool ignoreBlankLines) : this(new StreamReader(stream, encoding), ignoreBlankLines)
{
}
public LineReader(TextReader reader) : this(reader, false)
{
}
TextReader mReader;
bool mIgnoreBlankLines;
public LineReader(TextReader reader, bool ignoreBlankLines)
{
mReader = reader;
mIgnoreBlankLines = ignoreBlankLines;
mCurrent = null;
}
public LineReader GetEnumerator()
{
return this;
}
public void Reset()
{
throw new NotSupportedException("LineReaderÖ»ÄܶÁÈ¡Ò»´Î");
}
string mCurrent;
public string Current
{
get
{
return mCurrent;
}
}
public bool MoveNext()
{
do
{
mCurrent = mReader.ReadLine();
}while (mIgnoreBlankLines && mCurrent != null && mCurrent.Length == 0);
return mCurrent != null;
}
public void Dispose()
{
mReader.Close();
}
}
}
测试代码:
using System;
using System.IO;
using System.Text;
using NUnit.Framework;
using Forks.Test;
namespace Forks.Utils.IO
{
[TestFixture]
public class LineReaderTest
{
const string TestLines = @"abc asd ewr afa e
start with blanks
end with blanks
ºº×Öabc123!@#
end of text!";
[Test]
public void ReadFromReader()
{
doTest(new LineReader(new StringReader(TestLines)));
}
[Test]
public void ReadFromFile()
{
string file = Path.GetTempFileName();
try
{
StringUtil.SaveToFile(TestLines, file, Encoding.GetEncoding("gb2312"));
doTest(new LineReader(file, Encoding.GetEncoding("gb2312")));
}
finally
{
FileUtil.SafeDelete(file);
}
}
[Test]
public void ReadFromStream()
{
string file = Path.GetTempFileName();
try
{
StringUtil.SaveToFile(TestLines, file, Encoding.GetEncoding("gb2312"));
using (Stream stream = new FileStream(file, FileMode.Open))
doTest(new LineReader(stream, Encoding.GetEncoding("gb2312")));
}
finally
{
FileUtil.SafeDelete(file);
}
}
void doTest(LineReader reader)
{
StringBuilder sb = new StringBuilder();
foreach (string line in reader)
sb.Append(line + Environment.NewLine);
Assert.AreEqual(TestLines + Environment.NewLine, sb.ToString());
}
[Test]
public void IgnoreBlankLine()
{
foreach (string line in new LineReader(new StringReader(TestLines), true))
Assert.IsTrue(line.Length != 0);
}
}
}
foreach (string line in new LineReader(”c:\abc.txt”))
Console.WriteLine(line);
完整代码如下:
using System;
using System.IO;
using System.Text;
using System.Collections;
namespace Forks.Utils.IO
{
public struct LineReader : IDisposable
{
public LineReader(string file, Encoding encoding) : this(file, encoding, false)
{
}
public LineReader(string file, Encoding encoding, bool ignoreBlankLines) : this(new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read), encoding, ignoreBlankLines)
{
}
public LineReader(Stream stream, Encoding encoding) : this(stream, encoding, false)
{
}
public LineReader(Stream stream, Encoding encoding, bool ignoreBlankLines) : this(new StreamReader(stream, encoding), ignoreBlankLines)
{
}
public LineReader(TextReader reader) : this(reader, false)
{
}
TextReader mReader;
bool mIgnoreBlankLines;
public LineReader(TextReader reader, bool ignoreBlankLines)
{
mReader = reader;
mIgnoreBlankLines = ignoreBlankLines;
mCurrent = null;
}
public LineReader GetEnumerator()
{
return this;
}
public void Reset()
{
throw new NotSupportedException("LineReaderÖ»ÄܶÁÈ¡Ò»´Î");
}
string mCurrent;
public string Current
{
get
{
return mCurrent;
}
}
public bool MoveNext()
{
do
{
mCurrent = mReader.ReadLine();
}while (mIgnoreBlankLines && mCurrent != null && mCurrent.Length == 0);
return mCurrent != null;
}
public void Dispose()
{
mReader.Close();
}
}
}
测试代码:
using System;
using System.IO;
using System.Text;
using NUnit.Framework;
using Forks.Test;
namespace Forks.Utils.IO
{
[TestFixture]
public class LineReaderTest
{
const string TestLines = @"abc asd ewr afa e
start with blanks
end with blanks
ºº×Öabc123!@#
end of text!";
[Test]
public void ReadFromReader()
{
doTest(new LineReader(new StringReader(TestLines)));
}
[Test]
public void ReadFromFile()
{
string file = Path.GetTempFileName();
try
{
StringUtil.SaveToFile(TestLines, file, Encoding.GetEncoding("gb2312"));
doTest(new LineReader(file, Encoding.GetEncoding("gb2312")));
}
finally
{
FileUtil.SafeDelete(file);
}
}
[Test]
public void ReadFromStream()
{
string file = Path.GetTempFileName();
try
{
StringUtil.SaveToFile(TestLines, file, Encoding.GetEncoding("gb2312"));
using (Stream stream = new FileStream(file, FileMode.Open))
doTest(new LineReader(stream, Encoding.GetEncoding("gb2312")));
}
finally
{
FileUtil.SafeDelete(file);
}
}
void doTest(LineReader reader)
{
StringBuilder sb = new StringBuilder();
foreach (string line in reader)
sb.Append(line + Environment.NewLine);
Assert.AreEqual(TestLines + Environment.NewLine, sb.ToString());
}
[Test]
public void IgnoreBlankLine()
{
foreach (string line in new LineReader(new StringReader(TestLines), true))
Assert.IsTrue(line.Length != 0);
}
}
}
无为清净楼资源网 Design By www.qnjia.com
广告合作:本站广告合作请联系QQ:858582 申请时备注:广告合作(否则不回)
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
免责声明:本站文章均来自网站采集或用户投稿,网站不提供任何软件下载或自行开发的软件! 如有用户或公司发现本站内容信息存在侵权行为,请邮件告知! 858582#qq.com
无为清净楼资源网 Design By www.qnjia.com
暂无评论...
更新日志
2024年09月25日
2024年09月25日
- 纯音入心系列纯音乐《中央民族乐团-古筝传奇》1CD[MP3][253.1MB]
- 江玲.1989-这样你才爱我,是吗?【新作有声】【WAV+CUE】
- 郭美美.2010-我是郭美美【华纳】【WAV+CUE】
- 黄心懋1991-轻忧郁【滚石】【WAV+CUE】
- 群星.2000-大地金曲世纪回顾2CD【大地】【WAV+CUE】
- 王菲.1996-浮躁(2024环球MQA-UHQCD限量版)【环球】【WAV+CUE】
- 群星.2022-传家电视剧原声带【东阳欢娱】【FLAC分轨】
- 《摇滚教父 伍佰黄金精选 2CD》 [WAV+CUE][1GB]
- 《凤凰传奇 我从草原来》[WAV/分轨][400MB]
- 《叶倩文 真心真意过一生》[WAV+CUE][400MB]
- 潘越云.1985-世间女子(滚石25周年经典复刻版)【滚石】【WAV+CUE】
- 陈柏宇.2009-CANT.BE.HALF【SONY】【WAV+CUE】
- 李明依.1989-小女生【滚石】【WAV+CUE】
- 《李荣浩 新时代创作新人王》[WAV分轨][310MB]
- 《黑鸭子与马头琴 史上最动听草原音乐》[WAV+CUE][320MB]