C#中csv文件与DataTable互相导入处理实例解析

摘要：本文介绍了C#中csv文件与DataTable互相导入处理实例解析，主要功能代码封装处理下，相对比较简单。以后项目用到的话可以直接使用。具体...

本文介绍了C#中csv文件与DataTable互相导入处理实例解析，主要功能代码封装处理下，相对比较简单。以后项目用到的话可以直接使用。具体方法如下：

1.封装好的类如下：

using System; using System.Data; using System.IO; using System.Text; using CSharpUtilHelpV2; using StringUtilHelp; namespace DBUtilHelpV2Plus { public static class DBToolV2Plus { /// <summary> /// 将DataTable导出到CSV. /// </summary> /// <param name="table">DataTable</param> /// <param name="fullSavePath">保存路径</param> /// <param name="tableheader">标题信息</param> /// <param name="columname">列名称『eg:姓名,年龄』</param> /// <returns>导出成功true;导出失败false</returns> public static bool ToCSV(this DataTable table, string fullSavePath, string tableheader, string columname) { ArgumentChecked(table, fullSavePath); //------------------------------------------------------------------------------------ try { string _bufferLine = ""; using (StreamWriter _writerObj = new StreamWriter(fullSavePath, false, Encoding.UTF8)) { if (!string.IsNullOrEmpty(tableheader)) _writerObj.WriteLine(tableheader); if (!string.IsNullOrEmpty(columname)) _writerObj.WriteLine(columname); for (int i = 0; i < table.Rows.Count; i++) { _bufferLine = ""; for (int j = 0; j < table.Columns.Count; j++) { if (j > 0) _bufferLine += ","; _bufferLine += table.Rows[i][j].ToString(); } _writerObj.WriteLine(_bufferLine); } return true; } } catch (Exception) { return false; } } /// <summary> /// 参数检查 /// </summary> /// <param name="table"></param> /// <param name="fullSavePath"></param> private static void ArgumentChecked(DataTable table, string fullSavePath) { if (table == null) throw new ArgumentNullException("table"); if (string.IsNullOrEmpty(fullSavePath)) throw new ArgumentNullException("fullSavePath"); string _fileName = CSharpToolV2.GetFileNameOnly(fullSavePath); if (string.IsNullOrEmpty(_fileName)) throw new ArgumentException(string.Format("参数fullSavePath的值{0},不是正确的文件路径!", fullSavePath)); if (!_fileName.InvalidFileNameChars()) throw new ArgumentException(string.Format("参数fullSavePath的值{0},包含非法字符!", fullSavePath)); } /// <summary> /// 将CSV文件数据导入到Datable中 /// </summary> /// <param name="table"></param> /// <param name="filePath">DataTable</param> /// <param name="rowIndex">保存路径</param> /// <returns>Datable</returns> public static DataTable AppendCSVRecord(this DataTable table, string filePath, int rowIndex) { ArgumentChecked(table, filePath); if (rowIndex < 0) throw new ArgumentException("rowIndex"); using (StreamReader reader = new StreamReader(filePath, Encoding.UTF8, false)) { int i = 0, j = 0; reader.Peek(); while (reader.Peek() > 0) { j = j + 1; string _line = reader.ReadLine(); if (j >= rowIndex + 1) { string[] _split = _line.Split(','); DataRow _row = table.NewRow(); for (i = 0; i < _split.Length; i++) { _row[i] = _split[i]; } table.Rows.Add(_row); } } return table; } } } }

2.代码使用测试如下：

using System; using System.Data; using DBUtilHelpV2; using DBUtilHelpV2Plus; namespace DBUtilHelpV2PlusTest { class Program { static DataTable testDb = null; static string fullSavePath = string.Format(@"C:{0}.csv", DateTime.Now.ToString("yyyyMMddHH")); static void Main(string[] args) { try { CreateTestDb(); Console.WriteLine(string.Format("DataTable导出到CSV文件{0}.", testDb.ToCSV(fullSavePath, "姓名,年龄", "人员信息表") == true "失败")); testDb.Rows.Clear(); Console.WriteLine(string.Format("清空数据,当前{0}条数据.", testDb.Rows.Count)); testDb = testDb.AppendCSVRecord(fullSavePath, 2); Console.WriteLine(string.Format("CSV文件导入到Datable,导入{0}条数据.", testDb.Rows.Count)); } catch (Exception ex) { Console.WriteLine(ex.Message); } finally { Console.ReadLine(); } } static void CreateTestDb() { if (testDb == null) { testDb = DBToolV2.CreateTable("Name,Age|int"); for (int i = 1; i <= 10; i++) { DataRow _row = testDb.NewRow(); _row["Name"] = string.Format("YanZhiwei_{0}", i); _row["Age"] = i; testDb.Rows.Add(_row); } } } } }

运行效果如下图所示：

C#中csv文件与DataTable互相导入处理实例解析1