C# 导出导入TXT文件
导出TXT关键类：
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using System.IO; using System.Globalization; using System.Windows.Forms; namespace Demo { /// <summary> /// 导出TXT /// 罗旭成 /// 2014-4-15 /// </summary> public class ExportTxt { #region * 将DataTable指定的列,导出到TXT文件. /// <summary> /// 将DataTable指定的列,导出到TXT文件. /// </summary> /// <param name="pDataTable">数据源表</param> /// <param name="pColName">列名</param> /// <param name="pColCaption">标题(未指定则使用列名)</param> /// <param name="pFilePath">完整的路径和文件名</param> public static void UTF8_SaveToTXT(DataTable pDataTable, string pColName, string pColCaption, string pFilePath) { //如果文件存在则删除 if (File.Exists(pFilePath)) { File.Delete(pFilePath); } //******************************************************************************************** using (FileStream stream = new FileStream(pFilePath, FileMode.Create, FileAccess.Write)) { using (StreamWriter writer = new StreamWriter(stream, Encoding.UTF8)) { //------ if ((pColName == null) || (pColName.Trim() == "")) { return; } if (pColCaption == null) { pColCaption = ""; } String[] xColArray = pColName.Split(new Char[] { ',' }); String[] xColCapArray = pColCaption.Split(new Char[] { ',' }); for (int xI = 0, xN = xColArray.Length; xI < xN; xI++) { xColArray.SetValue(xColArray[xI].Trim(), xI); } for (int xI = 0, xN = xColCapArray.Length; xI < xN; xI++) { xColCapArray.SetValue(xColCapArray[xI].Trim(), xI); } //--************************************************************************************************* //--如果标题不为空 if (pColCaption.Trim() != "") { if (xColArray.Length == xColCapArray.Length)//标题和列名的数量必须相同 { int x = 0; Boolean xFind = false; for (int j = 1; j < xColArray.Length; j++) { //设计列名 for (int i = 0; i < pDataTable.Columns.Count; i++) { if (xColArray[j] == pDataTable.Columns[i].ColumnName) { xFind = true; UTF8_WriteString(writer, xColCapArray[j - 1], 0, 1);//(列名)不是最后一列的处理方式 x = j; break; } } if (xFind == false) { MessageBox.Show("指定的列名不存在！"); return; } } UTF8_WriteString(writer, xColCapArray[x], 0, 2);//(列名)最后一列的处理方式 //--************************************************************************************************ //设计列数据 int y = 0; //------------- for (int b = 0; b < pDataTable.Columns.Count; b++) { for (int a = 0; a < xColArray.Length; a++) { if (xColArray[a] == pDataTable.Columns[b].ColumnName) { y = b;//获取最大列的索引 } } } //------------- for (int j = 0; j < pDataTable.Rows.Count; j++) { for (int i = 0; i < pDataTable.Columns.Count; i++) { String pColType = pDataTable.Columns[i].DataType.Name.ToString();//获取列类型 for (int k = 1; k < xColArray.Length; k++) { if (xColArray[k - 1] == pDataTable.Columns[i].ColumnName.ToString()) { //*************************************************************************************** //--不是最后一列的处理方式 if (pDataTable.Rows[j][i].ToString() != "") { switch (pColType) { case "String": { UTF8_WriteString(writer, pDataTable.Rows[j][i].ToString(), 0, 1); break; } case "Int32": { UTF8_WriteString(writer, pDataTable.Rows[j][i].ToString(), 0, 1); break; } case "Boolean": { UTF8_WriteBoolean(writer, Convert.ToBoolean(pDataTable.Rows[j][i]), 1, 1); break; } case "DateTime": { UTF8_WriteDate(writer, Convert.ToDateTime(pDataTable.Rows[j][i]), "yyyy-MM-dd", 0, 1); break; } case "Decimal": { UTF8_WriteDecimal(writer, Convert.ToDecimal(pDataTable.Rows[j][i]), 3, 0, 1); break; } default: { UTF8_WriteString(writer, pDataTable.Rows[j][i].ToString(), 0, 1); break; } } } else { UTF8_WriteString(writer, "", 0, 1); } } } } //*********************************************************************************************** //********************最后一列的处理方式********************************************************* String pColType1 = pDataTable.Columns[y].DataType.Name.ToString();//获取列类型 if (pDataTable.Rows[j][y].ToString() != "") { switch (pColType1) { case "String": { UTF8_WriteString(writer, pDataTable.Rows[j][y].ToString(), 0, 2); break; } case "Int32": { UTF8_WriteString(writer, pDataTable.Rows[j][y].ToString(), 0, 2); break; } case "Boolean": { UTF8_WriteBoolean(writer, Convert.ToBoolean(pDataTable.Rows[j][y]), 1, 2); break; } case "DateTime": { UTF8_WriteDate(writer, Convert.ToDateTime(pDataTable.Rows[j][y]), "yyyy-MM-dd", 0, 2); break; } case "Decimal": { UTF8_WriteDecimal(writer, Convert.ToDecimal(pDataTable.Rows[j][y]), 3, 0, 2); break; } default: { UTF8_WriteString(writer, pDataTable.Rows[j][y].ToString(), 0, 2); break; } } } else { UTF8_WriteString(writer, "", 0, 2); } //********************************************************************************************** } } else { MessageBox.Show("指定的列不正确！"); return; } } else //--如果标题为空 { //**************************************************************************** int m = 0; Boolean xFind = false; //**************************************************************************** //***********************设计列名********************************************* for (int i = 1; i < xColArray.Length; i++) { for (int j = 0; j < pDataTable.Columns.Count; j++) { if (xColArray[i] == pDataTable.Columns[j].ColumnName) { xFind = true; UTF8_WriteString(writer, xColArray[i - 1], 0, 1);//(列名)不是最后一列的处理方式 m = i; break; } } if (xFind == false) { MessageBox.Show("指定的列名不存在！"); return; } } UTF8_WriteString(writer, xColArray[m], 0, 2);//(列名)最后一列的处理方式 //*************************************************************************** //设计列数据 int n = 0; //---- for (int i = 0; i < pDataTable.Columns.Count; i++) { for (int j = 0; j < xColArray.Length; j++) { if (xColArray[j] == pDataTable.Columns[i].ColumnName) { n = i;//获取最大列的索引值 } } } //---- for (int i = 0; i < pDataTable.Rows.Count; i++) { for (int j = 0; j < pDataTable.Columns.Count; j++) { String pColType = pDataTable.Columns[j].DataType.Name.ToString();//获取列；类型 for (int k = 1; k < xColArray.Length; k++) { if (xColArray[k - 1] == pDataTable.Columns[j].ColumnName.ToString()) { if (pDataTable.Rows[i][j].ToString() != "") { switch (pColType) { case "String": { UTF8_WriteString(writer, pDataTable.Rows[i][j].ToString(), 0, 1); break; } case "Int32": { UTF8_WriteString(writer, pDataTable.Rows[i][j].ToString(), 0, 1); break; } case "Boolean": { UTF8_WriteBoolean(writer, Convert.ToBoolean(pDataTable.Rows[i][j]), 1, 1); break; } case "DateTime": { UTF8_WriteDate(writer, Convert.ToDateTime(pDataTable.Rows[i][j]), "yyyy-MM-dd", 0, 1); break; } case "Decimal": { UTF8_WriteDecimal(writer, Convert.ToDecimal(pDataTable.Rows[i][j]), 3, 0, 1); break; } default: { UTF8_WriteString(writer, pDataTable.Rows[i][j].ToString(), 0, 1); break; } } } else { UTF8_WriteString(writer, "", 0, 1); } } } } //*********************************************************************************************** //********************最后一列的处理方式********************************************************* String pColType2 = pDataTable.Columns[n].DataType.Name.ToString();//获取列类型 if (pDataTable.Rows[i][n].ToString() != "") { switch (pColType2) { case "String": { UTF8_WriteString(writer, pDataTable.Rows[i][n].ToString(), 0, 2); break; } case "Int32": { UTF8_WriteString(writer, pDataTable.Rows[i][n].ToString(), 0, 2); break; } case "Boolean": { UTF8_WriteBoolean(writer, Convert.ToBoolean(pDataTable.Rows[i][n]), 1, 2); break; } case "DateTime": { UTF8_WriteDate(writer, Convert.ToDateTime(pDataTable.Rows[i][n]), "yyyy-MM-dd", 0, 2); break; } case "Decimal": { UTF8_WriteDecimal(writer, Convert.ToDecimal(pDataTable.Rows[i][n]), 3, 0, 2); break; } default: { UTF8_WriteString(writer, pDataTable.Rows[i][n].ToString(), 0, 2); break; } } } else { UTF8_WriteString(writer, "", 0, 2); } //******************************************************************************************************** } } } } } #endregion #region * 转换日期的输出格式 /// <summary> /// 转换日期的输出格式 /// </summary> /// <param name="pStreamWriter"></param> /// <param name="pValue"></param> /// <param name="pformat">1,2,3,4四种情况</param> /// <param name="pSymbol"></param> public static void UTF8_WriteDate(StreamWriter pStreamWriter, DateTime pValue, String pformat, int pLen, int pSymbol) { UTF8_WriteString(pStreamWriter, pValue.ToString(pformat, DateTimeFormatInfo.InvariantInfo), pLen, pSymbol); } #endregion #region * 转换小数的输出位数 /// <summary> /// 转换小数的输出位数 /// </summary> /// <param name="pStreamWriter"></param> /// <param name="pValue"></param> /// <param name="pSize">限制输出小数的位数</param> /// <param name="pSymbol"></param> public static void UTF8_WriteDecimal(StreamWriter pStreamWriter, decimal pValue, int pSize, int pLen, int pSymbol) { UTF8_WriteString(pStreamWriter, decimal.Round(pValue, pSize, MidpointRounding.AwayFromZero).ToString(), pLen, pSymbol); } #endregion #region * 转换Boolean值 /// <summary> /// 第一种情况，输出数字0，1 /// </summary> /// <param name="pStreamWriter"></param> /// <param name="pformat">true,false</param> /// <param name="pSymbol"></param> public static void UTF8_WriteBoolean(StreamWriter pStreamWriter, Boolean pValue, int pType, int pSymbol) { if (pType == 0) { if (pValue == true) { UTF8_WriteString(pStreamWriter, "true", 0, pSymbol); } if (pValue == false) { UTF8_WriteString(pStreamWriter, "false", 0, pSymbol); } } if (pType == 1) { if (pValue == true) { UTF8_WriteString(pStreamWriter, "0", 0, pSymbol); } if (pValue == false) { UTF8_WriteString(pStreamWriter, "1", 0, pSymbol); } } } /// <summary> /// 第二种情况，输出TRUE，FALSE /// </summary> /// <param name="pStreamWriter"></param> /// <param name="pValue">0,1</param> /// <param name="pSymbol"></param> public static void UTF8_WriteBoolean(StreamWriter pStreamWriter, int pValue, int pType, int pSymbol) { if (pType == 0) { if (pValue == 0) { UTF8_WriteString(pStreamWriter, "0", 0, pSymbol); } if (pValue == 1) { UTF8_WriteString(pStreamWriter, "1", 0, pSymbol); } } if (pType == 1) { if (pValue == 0) { UTF8_WriteString(pStreamWriter, "true", 0, pSymbol); } if (pValue == 1) { UTF8_WriteString(pStreamWriter, "false", 0, pSymbol); } } } #endregion #region * 写入字符串,分列符和换行符 /// <summary> /// 写入字符串,分列符和换行符 /// </summary> /// <param name="pStreamWriter"></param> /// <param name="pString"></param> /// <param name="pType">[1]:Add Tab [2]:Enter</param> public static void UTF8_WriteString(StreamWriter pStreamWriter, string pString, int pLen, int pSymbol) { if (pLen < 0) { MessageBox.Show("你输入的长度不符合要求！"); return; } if (pLen == 0) { pStreamWriter.Write(pString); } else { pStreamWriter.Write(pString.Substring(0, pLen)); } UTF8_WriteSymbol(pStreamWriter, pSymbol); } #endregion #region * 写入分列符号和回车换行符 /// <summary> /// 写入分列符号和回车换行符 /// </summary> /// <param name="pStreamWriter"></param> /// <param name="pType">[1]:Add Tab [2]:Enter</param> public static void UTF8_WriteSymbol(StreamWriter pStreamWriter, int pType) { //--EFBBBF UTF8识别标识. byte Symbol1 = 0X0D; byte Symbol2 = 0X0A; byte Symbol3 = 0X09; string vTab = ((char)Symbol3).ToString(); // Tab分列 string vEnter = ((char)Symbol1).ToString() + ((char)Symbol2).ToString(); //回车换行 if (pType == 1) { pStreamWriter.Write(vTab); } if (pType == 2) { pStreamWriter.Write(vEnter); } } #endregion } }
导出TXT的例子：
#region * 导出TXT文件 private void btnExportTxt_Click(object sender, EventArgs e) { if (this.txtSaveDir.Text.Trim() != "") { if (DemoTb != null && DemoTb.Rows.Count > 0) { ExportTxt.UTF8_SaveToTXT(DemoTb, "姓名,年龄,性别,籍贯,创建时间", "姓名,年龄,性别,籍贯,创建时间", this.txtSaveDir.Text.Trim()); MessageBox.Show("导出文件成功!"); } else { MessageBox.Show("数据为空，不能进行导出!"); } } else { MessageBox.Show("导出文件目录不能为空!"); } } #endregion
导入TXT的例子：
#region * 导入TXT文件 private void btnImportTxt_Click(object sender, EventArgs e) { try { if (this.txtFindDir.Text.Trim() != "") { byte Symbol1 = 0X0D; byte Symbol2 = 0X0A; string vEnter = ((char)Symbol1).ToString() + ((char)Symbol2).ToString(); //回车换行 //-- StreamReader reader = new StreamReader(this.txtFindDir.Text.Trim()); string str = string.Empty; ArrayList arrayList = new ArrayList(); str = reader.ReadToEnd(); if (!string.IsNullOrEmpty(str)) { string[] arrstr = str.Split(vEnter.ToCharArray()); foreach (string item in arrstr) { //去掉空行 if (!string.IsNullOrEmpty(item)) { arrayList.Add(item); } } } if (arrayList != null && arrayList.Count > 0) { DemoTb.Clear(); //第二行开始，第一行为标题 for (int i = 1; i < arrayList.Count; i++) { string[] arr = arrayList[i].ToString().Split("\t".ToCharArray()); DataRow dr = DemoTb.NewRow(); dr["姓名"] = arr[0]; dr["年龄"] = arr[1]; dr["性别"] = arr[2]; dr["籍贯"] = arr[3]; dr["创建时间"] = arr[4]; DemoTb.Rows.Add(dr); } } this.dataGridView1.DataSource = DemoTb; } else { MessageBox.Show("导入文件目录不能为空!"); } } catch (Exception eMsg) { MessageBox.Show("导入数据出错:" + eMsg.ToString()); } } #endregion
以上即可完成对TXT文件的导入导出。