CSV字符串到DataTable

我有以下字符串，我想将其转换为DataTable

"Id,Name ,Dept\r\n1,Mike,IT\r\n2,Joe,HR\r\n3,Peter,IT\r\n" 

我可以使用String.Split创建它并迭代集合。 但我需要有效的方法（使用C＃4.0function）如何使用LINQ或lambda创建表。

Answer 1

我不知道你在找什么：

 string s = "Id,Name ,Dept\r\n1,Mike,IT\r\n2,Joe,HR\r\n3,Peter,IT\r\n"; DataTable dt = new DataTable(); string[] tableData = s.Split("\r\n".ToCharArray(), StringSplitOptions.RemoveEmptyEntries); var col = from cl in tableData[0].Split(",".ToCharArray()) select new DataColumn(cl); dt.Columns.AddRange(col.ToArray()); (from st in tableData.Skip(1) select dt.Rows.Add(st.Split(",".ToCharArray()))).ToList(); 

Answer 2

我认为这种方法很有用。 此方法可用于CSVString或CsvFilePath。 如果要转换CsvFilePath，则必须指定第一个路径为true，否则为false。

 public DataTable ConvertCsvStringToDataTable(bool isFilePath,string CSVContent) { //CSVFilePathName = @"C:\test.csv"; string[] Lines; if (isFilePath) { Lines = File.ReadAllLines(CSVContent); } else { Lines = CSVContent.Split("\r\n".ToCharArray(), StringSplitOptions.RemoveEmptyEntries); } string[] Fields; Fields = Lines[0].Split(new char[] { ',' }); int Cols = Fields.GetLength(0); DataTable dt = new DataTable(); //1st row must be column names; force lower case to ensure matching later on. for (int i = 0; i < Cols; i++) dt.Columns.Add(Fields[i].ToLower(), typeof(string)); DataRow Row; for (int i = 1; i < Lines.GetLength(0); i++) { Fields = Lines[i].Split(new char[] { ',' }); Row = dt.NewRow(); for (int f = 0; f < Cols; f++) Row[f] = Fields[f]; dt.Rows.Add(Row); } return dt; } 

Answer 3

 using System; using System.Xml; using System.Data; using System.Collections.Generic; using System.Linq; using System.Text; public static string DataTableToString(DataTable dtData) { string sData = null; StringBuilder sBuffer = null; string Token = null; int i = 0; int j = 0; sBuffer = new StringBuilder(); sBuffer.Append(@""); sBuffer.Append(@""); foreach (DataColumn Col in dtData.Columns) { sBuffer.Append(@""); } sBuffer.Append(@""); i = 0; foreach (DataRow rw in dtData.Rows) { sBuffer.Append(@""); j = 0; foreach (DataColumn Col in dtData.Columns) { if (!Convert.IsDBNull(rw[Col.ColumnName])) { Token = Convert.ToString(rw[Col.ColumnName]); } else { Token = null; } sBuffer.Append(@""); j++; } sBuffer.Append(@""); i++; } sBuffer.Append(@"
") .Append(Col.ColumnName.Replace("&", "")) .Append(@"
").Append(Token).Append(@"
"); sData = sBuffer.ToString(); return sData; } public static DataTable StringToDataTable(string sXmlData) { DataTable dtData = null; XmlDocument xmlDoc = null; XmlNode RootNode = null; XmlNodeList TRList = null; XmlNodeList THList = null; XmlNodeList TDList = null; int i = 0; int j = 0; XmlAttribute DataTypeAttrib = null; string sDataType = null; DataColumn Col = null; Type ColType; string Token = null; DataRow newRw = null; xmlDoc = new XmlDocument(); xmlDoc.LoadXml(sXmlData); RootNode = xmlDoc.SelectSingleNode("/TABLE"); if (RootNode != null) { dtData = new DataTable(); i = 0; TRList = RootNode.SelectNodes("TR"); foreach (XmlNode TRNode in TRList) { if (i == 0) { THList = TRNode.SelectNodes("TH"); foreach (XmlNode THNode in THList) { DataTypeAttrib = THNode.Attributes["ColType"]; sDataType = DataTypeAttrib.Value; ColType = Type.GetType(sDataType); Col = new DataColumn(THNode.InnerText, ColType); if (!dtData.Columns.Contains(Col.ColumnName)) { dtData.Columns.Add(Col); } } } else { newRw = dtData.NewRow(); j = 0; TDList = TRNode.SelectNodes("TD"); foreach (XmlNode TDNode in TDList) { ColType = dtData.Columns[j].DataType; Token = TDNode.InnerText; if (!string.IsNullOrEmpty(Token)) { try { newRw[j] = Convert.ChangeType(Token, ColType); } catch { if (ColType == typeof(DateTime)) { newRw[j] = DateTime.ParseExact(Token, "yyyyMMdd", System.Globalization.CultureInfo.InvariantCulture); } } } else { newRw[j] = Convert.DBNull; } j++; } dtData.Rows.Add(newRw); } i++; } } return dtData; }