实例介绍
按行读文件
核心代码：
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 | using System;using System.IO;using System.Collections.Generic;using System.Text;using System.Runtime.InteropServices;namespace Junior.Utils{ class FileReader : IDisposable { private string fileExt = null; private FileStream fs = null; private StreamReader sr = null; private string path = string.Empty; private Encoding encode = Encoding.Default; private FileInfo fileInfo = null; private bool eof; #region FileSize /// <summary> /// 文件大小 /// </summary> public long FileSize { get { if (fileInfo != null) return fileInfo.Length; fileInfo = new FileInfo(path); return fileInfo.Length; } } #endregion #region FileClusterSize //// <summary> /// 结构。硬盘信息 /// </summary> private struct DiskInfo { //public string RootPathName; //每簇的扇区数 public int SectorsPerCluster; //每扇区字节 public int BytesPerSector; //public int NumberOfFreeClusters; //public int TotalNumberOfClusters; } //调用windows API获取磁盘空闲空间 //导入库 [DllImport("kernel32.dll", CharSet = CharSet.Auto)] static extern bool GetDiskFreeSpace([MarshalAs(UnmanagedType.LPTStr)]string rootPathName, ref int sectorsPerCluster, ref int bytesPerSector, ref int numberOfFreeClusters, ref int totalNumbeOfClusters); private DiskInfo GetDiskInfo(string rootPathName) { DiskInfo diskInfo = new DiskInfo(); int sectorsPerCluster = 0, bytesPerSector = 0, numberOfFreeClusters = 0, totalNumberOfClusters = 0; GetDiskFreeSpace(rootPathName, ref sectorsPerCluster, ref bytesPerSector, ref numberOfFreeClusters, ref totalNumberOfClusters); //每簇的扇区数 diskInfo.SectorsPerCluster = sectorsPerCluster; //每扇区字节 diskInfo.BytesPerSector = bytesPerSector; return diskInfo; } /// <summary> /// 文件每簇的字节 /// </summary> public long FileClusterSize { get { long clusterSize = 0; DiskInfo diskInfo = new DiskInfo(); diskInfo = GetDiskInfo(fileInfo.Directory.Root.FullName); clusterSize = (diskInfo.BytesPerSector * diskInfo.SectorsPerCluster); return clusterSize; } } #endregion public long FileSizeOnDisk { get { long temp = 0; long clusterSize = FileClusterSize; if (fileInfo.Length % clusterSize != 0) { decimal res = fileInfo.Length / clusterSize; int clu = Convert.ToInt32(Math.Ceiling(res)) 1; temp = clusterSize * clu; } else { return fileInfo.Length; } return temp; } } public bool EOF { get { try { return sr.EndOfStream; } catch { eof = true; return eof; } } } /// <summary> /// 获取总行数 - 会重新创建文件流 /// </summary> public int TotalLines { get { using (FileStream tempfs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)) { int count = 0; using (StreamReader tempsr = new StreamReader(tempfs, encode)) { while (!tempsr.EndOfStream) { count ; tempsr.ReadLine(); } } return count; } } } /// <summary> /// 创建一个读文件对象 /// </summary> /// <param name="path"></param> public FileReader(string path) { try { this.path = path; fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); sr = new StreamReader(fs, Encoding.Default); fileExt = Path.GetExtension(path); fileInfo = new FileInfo(path); } catch { throw new FileNotFoundException("文件未找到"); } } public FileReader(string path, Encoding encoding) { try { this.path = path; encode = encoding; fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite); sr = new StreamReader(fs, encoding); fileExt = Path.GetExtension(path); fileInfo = new FileInfo(path); } catch { throw new FileNotFoundException("文件未找到"); } } public List<string> AutoReadToList(bool filterDuplicate) { switch (fileExt) { case ".txt": return this.ReadTxtToList(filterDuplicate); case ".csv": return this.ReadCsvToList(0, filterDuplicate); default: throw new Exception("不能读取" fileExt "扩展名的文件"); } } /// <summary> /// 读取Txt中的行到list中 /// </summary> /// <param name="filterSame">是否过滤重复</param> /// <returns>Line List</returns> public List<string> ReadTxtToList(bool filterDuplicate) { List<string> lineList = null; string line = ""; //判断读文件流是否为空 if (sr != null) { //是否过滤重复 if (filterDuplicate) { lineList = new List<string>(); while (!sr.EndOfStream) { line = sr.ReadLine(); if (line.Trim().Length > 0) if (!lineList.Contains(line)) { lineList.Add(line); } } } else { lineList = new List<string>(); while (!sr.EndOfStream) { line = sr.ReadLine(); if (line.Trim().Length > 0) lineList.Add(line); } } } line = null; return lineList; } /// <summary> /// 读取Csv文件暂时不支持带"，"的列 /// </summary> /// <param name="nReadColumn">读取第几行</param> /// <param name="filterDuplicate">是否过滤重复</param> /// <returns>返回List</returns> public List<string> ReadCsvToList(int nReadColumn, bool filterDuplicate) { List<string> filedList = null; string[] splitTest = null; //判断读文件流是否为空 if (sr != null) { //是否过滤重复 if (filterDuplicate) { filedList = new List<string>(); while (!sr.EndOfStream) { splitTest = sr.ReadLine().Split(','); if (splitTest[nReadColumn].Trim().Length > 0) if (!filedList.Contains(splitTest[nReadColumn])) filedList.Add(splitTest[nReadColumn]); } } else { filedList = new List<string>(); while (!sr.EndOfStream) { splitTest = sr.ReadLine().Split(','); if (splitTest[nReadColumn].Trim().Length > 0) filedList.Add(splitTest[nReadColumn]); } } } splitTest = null; return filedList; } /// <summary> /// 读Txt文件中的链接到Dictionary中按照域名分组 /// </summary> /// <param name="filterDuplicate">是否过滤重复</param> /// <returns>Dictionary按照域名分组后的对象</returns> public Dictionary<string, List<string>> ReadTXTFileToDictionaryWithDomain(bool filterDuplicate) { Dictionary<string, List<string>> dictionary = new Dictionary<string, List<string>>(); Uri uri = null; string line = ""; //判断读文件流是否为空 if (sr != null) { //是否过滤重复 if (filterDuplicate) { while (!sr.EndOfStream) { line = sr.ReadLine(); if (line.Trim().Length > 0) { try { uri = new Uri(line); if (dictionary.ContainsKey(uri.Host)) { if (!dictionary[uri.Host].Contains(line)) { dictionary[uri.Host].Add(line); } } else { dictionary.Add(uri.Host, new List<string>()); dictionary[uri.Host].Add(line); } } catch { //string msg = "出错啦"; } } } } else { while (!sr.EndOfStream) { line = sr.ReadLine(); if (line.Trim().Length > 0) { try { uri = new Uri(line); if (dictionary.ContainsKey(uri.Host)) { dictionary[uri.Host].Add(line); } else { dictionary.Add(uri.Host, new List<string>()); dictionary[uri.Host].Add(line); } } catch { //string msg = "出错啦"; } } } } } line = null; return dictionary; } public string ReadTXTLine() { if (!sr.EndOfStream) { return sr.ReadLine(); } return null; } public string ReadToEnd() { if (!sr.EndOfStream) { return sr.ReadToEnd(); } return null; } /// <summary> /// 关闭流 /// </summary> public void Close() { if (this.sr != null) sr.Close(); if (this.fs != null) fs.Close(); } /// <summary> /// 释放此对象引用的所有资源 /// </summary> public void Dispose() { if (this.sr != null) sr.Close(); if (this.fs != null) fs.Close(); if (this.sr != null) sr.Dispose(); if (this.fs != null) fs.Dispose(); } }} |
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