.NET中如何将文本文件的内容存储到DataSet

前言

项目中对文本文件的操作比较简单，但是如果需要将文本文件的内容写入系统的缓存中，操作起来，会稍微的繁琐一些。现在总结一个较为通用的方法，将文本文件的内容缓存进入DataSet数据集中。下面话不多说了，我们直接来看示例代码吧。

示例代码

  private DataSet _iifSet;  /// <summary>  /// 将文本文件转化为DataSet  /// </summary>  /// <param name="filePath"></param>  /// <returns></returns>  public DataSet Parse(string filePath)  {　　　　　　　　if (string.IsNullOrEmpty(filePath))　　　　　　　　{　　　　　　　　　　throw new ArgumentNullException(filePath);　　　　　　　　}try   {    _iifSet = new DataSet();    var fileText = System.IO.File.ReadAllText(filePath);    var lines = fileText.Split('/n');    CreateTables(lines, _iifSet);    FillSet(lines, _iifSet);    return _iifSet;   }   catch (IOException ex)   {    throw new IOException(ex.Message);   }     }  /// <summary>  /// 读取行数组并将其解析为数据集的表  /// </summary>  /// <param name="lines">String iif文件中的行数组</param>  /// <param name="set"></param>  private void FillSet(IReadOnlyList<string> lines, DataSet set)  {   for (var i = 0; i < lines.Count; i++)   {    if (IsTableHeader(lines[i]))    {     continue;    }    if (lines[i] == "" || lines[i] == "/r" || lines[i] == "/n/r" || lines[i] == "/n")    {     continue;    }    if (lines[i].IndexOf(";__IMPORTED__", StringComparison.Ordinal) != -1)    {     continue;    }    var line = lines[i];    while (!IsFullLine(line, set))    {     i++;     line += lines[i];    }    ParseRecord(line, set);   }  }  /// <summary>  /// 解析记录  /// </summary>  /// <param name="line"></param>  /// <param name="set"></param>  private void ParseRecord(string line, DataSet set)  {   if (IsTableHeader(line))   {    return;   }   var tablename = line.Split('/t')[0];   var parameters = CreateDataRowParams(line, set.Tables[tablename].Columns.Count);   if (parameters.Length > 0)    set.Tables[tablename].Rows.Add(parameters);  }  private bool IsFullLine(string line, DataSet set)  {   if (IsTableHeader(line))   {    return true;   }   var values = line.Split('/t').Length;   var tableName = line.Split('/t')[0];   var columns = set.Tables[tableName].Columns.Count;   return values >= columns;  }  private bool IsTableHeader(string tab)  {   return tab.StartsWith("!");  }  /// <summary>  /// 创建datatable  /// </summary>  /// <param name="lines"></param>  /// <param name="set"></param>  private void CreateTables(IReadOnlyList<string> lines, DataSet set)  {   foreach (var t in lines.Where(IsTableHeader))   {    set.Tables.Add(CreateTable(t));   }  }  private DataTable CreateTable(string line)  {   var values = line.Split('/t');   values[0] = values[0].Substring(1);   var dt = new DataTable(values[0]);   values[0] = null;   foreach (var name in values)   {    if (string.IsNullOrEmpty(name))     continue;    var dc = new DataColumn(name, typeof(string));    try    {     dt.Columns.Add(dc);    }    catch (DuplicateNameException)    {     dc = new DataColumn(name + "_duplicateCol" + dt.Columns.Count);     dt.Columns.Add(dc);    }   }   return dt;  }  public string GetTableName(string line)  {   var values = line.Split('/t');   if (values[0].StartsWith("!"))   {    values[0] = values[0].Substring(1);   }   return values[0];  }  public readonly static object[] EmptyStringArray = { };  private object[] CreateDataRowParams(string line, int maxLength)  {   var raw = line.Split('/t');   var length = raw.Length - 1;   if (length == 0 || maxLength == 0)    return EmptyStringArray;   if (length > maxLength)    length = maxLength;   var values = new string[length];   for (var i = 0; i < length; i++)   {    values[i] = raw[i + 1];   }   if (values[values.Length - 1].EndsWith("/n"))   {    values[values.Length - 1] = values[values.Length - 1].Substring(0, values[values.Length - 1].LastIndexOf('/n'));   }   else if (values[values.Length - 1].EndsWith("/n/r"))   {    values[values.Length - 1] = values[values.Length - 1].Substring(0, values[values.Length - 1].LastIndexOf("/n/r", StringComparison.Ordinal));   }   else if (values[values.Length - 1].EndsWith("/r"))   {    values[values.Length - 1] = values[values.Length - 1].Substring(0, values[values.Length - 1].LastIndexOf('/r'));   }   return values;  }  protected virtual void Dispose(bool cleanAll)  {   _iifSet?.Dispose();  }  public void Dispose()  {   Dispose(true);   GC.SuppressFinalize(this);  }