namespace ExcelToTxt 
{ 
    partial class Form1 
    { 
        /// <summary>
        /// 必需的设计器变量。 
        /// </summary>
        private System.ComponentModel.IContainer components = null; 

        /// <summary>
        /// 清理所有正在使用的资源。 
        /// </summary>
        /// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
        protected override void Dispose(bool disposing) 
        { 
            if (disposing && (components != null)) 
            { 
                components.Dispose(); 
            } 
            base.Dispose(disposing); 
        } 

        #region Windows 窗体设计器生成的代码 

        /// <summary>
        /// 设计器支持所需的方法 - 不要 
        /// 使用代码编辑器修改此方法的内容。 
        /// </summary>
        private void InitializeComponent() 
        { 
            this.dgvShow = new System.Windows.Forms.DataGridView(); 
            this.btnSelect = new System.Windows.Forms.Button(); 
            this.btnChange = new System.Windows.Forms.Button(); 
            ((System.ComponentModel.ISupportInitialize)(this.dgvShow)).BeginInit(); 
            this.SuspendLayout(); 
            //  
            // dgvShow 
            //  
            this.dgvShow.AllowUserToAddRows = false; 
            this.dgvShow.AllowUserToDeleteRows = false; 
            this.dgvShow.AllowUserToResizeRows = false; 
            this.dgvShow.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize; 
            this.dgvShow.Dock = System.Windows.Forms.DockStyle.Top; 
            this.dgvShow.Location = new System.Drawing.Point(0, 0); 
            this.dgvShow.Name = "dgvShow"; 
            this.dgvShow.RowTemplate.Height = 23; 
            this.dgvShow.Size = new System.Drawing.Size(885, 600); 
            this.dgvShow.TabIndex = 0; 
            //  
            // btnSelect 
            //  
            this.btnSelect.Location = new System.Drawing.Point(202, 611); 
            this.btnSelect.Name = "btnSelect"; 
            this.btnSelect.Size = new System.Drawing.Size(148, 23); 
            this.btnSelect.TabIndex = 1; 
            this.btnSelect.Text = "选择excel文件"; 
            this.btnSelect.UseVisualStyleBackColor = true; 
            this.btnSelect.Click += new System.EventHandler(this.btnSelect_Click); 
            //  
            // btnChange 
            //  
            this.btnChange.Location = new System.Drawing.Point(403, 611); 
            this.btnChange.Name = "btnChange"; 
            this.btnChange.Size = new System.Drawing.Size(152, 23); 
            this.btnChange.TabIndex = 2; 
            this.btnChange.Text = "转换为txt文档"; 
            this.btnChange.UseVisualStyleBackColor = true; 
            this.btnChange.Click += new System.EventHandler(this.btnChange_Click); 
            //  
            // Form1 
            //  
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); 
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; 
            this.ClientSize = new System.Drawing.Size(885, 646); 
            this.Controls.Add(this.btnChange); 
            this.Controls.Add(this.btnSelect); 
            this.Controls.Add(this.dgvShow); 
            this.Name = "Form1"; 
            this.Text = "文件转换"; 
            ((System.ComponentModel.ISupportInitialize)(this.dgvShow)).EndInit(); 
            this.ResumeLayout(false); 

        } 

        #endregion 

        private System.Windows.Forms.DataGridView dgvShow; 
        private System.Windows.Forms.Button btnSelect; 
        private System.Windows.Forms.Button btnChange; 
    } 
}

  using System;  
  using System.Collections.Generic;  
  using System.ComponentModel;  
  using System.Data;  
  using System.Data.OleDb;  
  using System.Drawing;  
  using System.Text;  
  using System.Windows.Forms;  
  using System.IO;  

   
  namespace ExcelToTxt  
  {  
      public partial class Form1 : Form  
      {  
          private DataTable dt; //存储EXCLE中的数据  

          public Form1()  
          {  
              InitializeComponent();  
              this.btnChange.Enabled = false;//初始化设置控件为不可用  
          }  

   
          /// <summary>  
          /// 该方法打开一个Excel文件  
          /// </summary>  
          /// <param name="sender"></param>  
          /// <param name="e"></param>  
          private void btnSelect_Click(object sender, EventArgs e)  
          {  
              string excelFilePath = ""; //存储打开的文件的路径  

              OpenFileDialog selectFile = new OpenFileDialog();  

              //选择打开的文件设置  
              selectFile.Filter = "Excel(*.xls)|*.xls";  
              selectFile.FilterIndex = 1;  
              selectFile.DefaultExt = "xls";  
              selectFile.AddExtension = true;  
              selectFile.RestoreDirectory = true;  
              selectFile.Multiselect = false;  

              //选择文件  
              if (selectFile.ShowDialog() == DialogResult.OK)  
              {  
                  excelFilePath = selectFile.FileName;//获取选择的文件路径  
              }  
              else 
              {  
                  return;  
              }  

              //得到控件的数据源  
              dt = GetExcelData(excelFilePath);  

              //在显示控件中显示数据  
              ShowDataGridView();  

              //设置转换格式的控件可用  
              this.btnChange.Enabled = true;  
          }  

   
          /// <summary>  
          ///该方法将选择的EXCEL文件转换成TXT文档   
          /// </summary>  
          /// <param name="sender"></param>  
          /// <param name="e"></param>  
          private void btnChange_Click(object sender, EventArgs e)  
          {  
              string txtFilePath = "";//存储选择的TXT文档的文件名  
              SaveFileDialog saveTxtFile = new SaveFileDialog();  

              //选择保存的文件设置  
              saveTxtFile.Filter = "Text(.txt)|*.txt";  
              saveTxtFile.FilterIndex = 1;  
              saveTxtFile.DefaultExt = "txt";  
              saveTxtFile.AddExtension = true;  
              saveTxtFile.RestoreDirectory = true;  
              saveTxtFile.OverwritePrompt = true;  

              //选择创建文件的文件夹  
              if (saveTxtFile.ShowDialog() == DialogResult.OK)  
              {  
                  txtFilePath = saveTxtFile.FileName; //获取选择的文件路径  
              }  
              else 
              {  
                  return;  
              }  

              //将DataTable中的文件写入到txt文档中  
              Cursor.Current = Cursors.WaitCursor; //设置鼠标状态  
              int dtcols = dt.Columns.Count;  
              StringBuilder sbtxtdata = new StringBuilder(); ;  //临时存储从dt中读出的每一条数据  

   
              //先创建一个新的TXT文档  
              FileStream fsTxtFile = new FileStream(txtFilePath, FileMode.CreateNew, FileAccess.Write);  
              StreamWriter swTxtFile = new StreamWriter(fsTxtFile, Encoding.GetEncoding("gb2312") );  

              if (dtcols > 3)  
              {  
                  string[] tempstr = new string[11];  

                  //设置固定的值  
                  tempstr[0] = "\"" + "检测设备资产标签" + "\"" + ",";  
                  tempstr[1] = "\"" + "设备名称" + "\"" + ",";  
                  tempstr[3] = "\"" + "规格型号" + "\"" + ",";  
                  tempstr[5] = "\"" + "设备编号" + "\"" + ",";  
                  tempstr[7] = "\"" + "使用部门" + "\"" + ",";  
                  tempstr[9] = "\"" + "固定资产编号" + "\"" + ",";   

                  //标签2的格式写入Txt文档  
                  for(int rows = 0; rows < dt.Rows.Count; rows++)  
                  {  
                      for (int cols = 0; cols < dt.Columns.Count; cols++)  
                      {  
                          int tempindex = 2*(cols+1);  
                          tempstr[tempindex] = "\"" + dt.Rows[rows][cols].ToString() + "\"";  
                      }  

                      tempstr[2] = tempstr[2] + ",";  
                      tempstr[4] = tempstr[4] + ",";  
                      tempstr[6] = tempstr[6] + ",";  
                      tempstr[8] = tempstr[8] + ",";  
                      tempstr[10] = tempstr[10] + "\r\n";  

                      //将本行数据写入缓冲区  
                      foreach (string str in tempstr)  
                      {  
                          sbtxtdata.Append(str);  
                      }  
                      swTxtFile.Write(sbtxtdata);  

                      //清空本行中的数据  
                      sbtxtdata.Remove(0, sbtxtdata.Length);  

                      //将数组中新添加的数据清空  
                      for (int i = 0; i < dt.Columns.Count; i++)  
                      {  
                          int tempindex = 2*(i+1);  
                          tempstr[tempindex] = "";  
                      }  
                  }  
              }  
              else 
              {  
                  string[] tempstr = new string[5];  
                  //标签0或1的格式写入Txt文档  
                  for (int rows = 0; rows < dt.Rows.Count; rows++)  
                  {  
                      for (int cols = 0; cols < dt.Columns.Count; cols++)  
                      {  
                          string temp = "";//临时存储当前时间  

                          if (cols == 0)  
                          {  
                              tempstr[0] = "\"" + dt.Rows[rows][cols] + "\"" + ",";  
                          }  
                          else if (cols == 1)  
                          {  
                              temp = dt.Rows[rows][cols].ToString();  
                              tempstr[1] = "\"" + temp.Substring(0, 4) + "\"" + ","; //截取年  
                              tempstr[2] = "\"" + temp.Substring(4, 2) + "\"" + ","; //截取月  
                              tempstr[3] = "\"" + temp.Substring(6, 2) + "\"" + ","; //截取日  
                          }  
                          else if (cols == 2)  
                          {  
                              tempstr[4] = "\"" + dt.Rows[rows][cols] + "\"" + "\r\n";  
                          }  
                      }  

                      //将本行数据写入缓冲区  
                      foreach (string str in tempstr)  
                      {  
                          sbtxtdata.Append(str);  
                      }  
                      swTxtFile.Write(sbtxtdata);  

                      //清空本行中的数据  
                      sbtxtdata.Remove(0, sbtxtdata.Length);  

                      //将数组中新添加的数据清空  
                      for (int i = 0; i < dt.Columns.Count; i++)  
                      {  
                          tempstr[i] = "";  
                      }  
                  }  
              }  

              //将数据写入文档  
              swTxtFile.Write("end");  
              swTxtFile.Flush();  
              swTxtFile.Close();  
              fsTxtFile.Close();  

              //重新设置鼠标格式  
              Cursor.Current = Cursors.Default;  
              MessageBox.Show("文件转换成功!", "提示",  
                      MessageBoxButtons.OK,  MessageBoxIcon.Information);  
          }  

   
          /// <summary>  
          /// 获取Excel文件中的数据  
          /// </summary>  
          /// <param name="path">Excel文件的路径</param>  
          /// <returns>DataTable:将Excel文件的数据加载到DataTable中</returns>  
          private DataTable GetExcelData(string path)  
          {  
              //连接字符串确定  
              string excelstr = "Provider = Microsoft.Jet.OLEDB.4.0;" + "Data Source= " + path + " ;"   
                          + " Extended Properties = Excel 8.0;";  

              OleDbConnection excelConn = new OleDbConnection(excelstr);  

              //打开数据源连接  
              try 
              {  
                  if (excelConn.State == ConnectionState.Closed)  
                  {  
                      excelConn.Open();  
                  }  
              }  
              catch (Exception ex)  
              {  
                  MessageBox.Show("打开数据源连接失败！", "错误",   
                          MessageBoxButtons.OK, MessageBoxIcon.Error);  
                  Application.Exit();  
              }  
              finally 
              {  
                  if(excelConn.State == ConnectionState.Open)  
                  excelConn.Close();  
              }  

              //设置查询命令  
              OleDbDataAdapter myCommand = new OleDbDataAdapter("SELECT * FROM [Sheet1$]", excelConn);  
              DataSet ds = new DataSet();  

              //执行该查询EXCEL表的命令  
              try 
              {  
                  myCommand.Fill(ds, "excelTable");  
              }  
              catch (Exception ex)  
              {  
                  MessageBox.Show("该Excel文件的工作表的名字不是[Sheet1$]!", "错误",   
                                        MessageBoxButtons.OK, MessageBoxIcon.Error);  
                  Application.Exit();  
              }  
              finally 
              {  
                  if (excelConn.State == ConnectionState.Closed)  
                  {  
                      excelConn.Close();  
                  }  
              }  

              //判断DataTable中是否有数据  
              if (ds.Tables["excelTable"].Rows.Count > 0)  
              {  
                  return ds.Tables["excelTable"];  
              }  
              else 
              {  
                  MessageBox.Show("没有读到Excel表中的数据!", "错误",   
                                          MessageBoxButtons.OK, MessageBoxIcon.Error);  
                  return null;  
              }  
          }  

   
          /// <summary>  
          /// 将选择的excel表中的数据现在DataGridView中  
          /// </summary>  
          private void ShowDataGridView()  
          {  
              //设置显示控件的样式  
              this.dgvShow.DefaultCellStyle.BackColor = Color.Beige;  
              this.dgvShow.DefaultCellStyle.Font = new Font("Tahoma", 12);  

              DataGridViewCellStyle highlightCellStyle = new DataGridViewCellStyle();  
              highlightCellStyle.BackColor = Color.Red;  

              DataGridViewCellStyle currencyCellStyle = new DataGridViewCellStyle();  
              currencyCellStyle.Format = "C";  
              currencyCellStyle.ForeColor = Color.Green;  

              //设置显示控件的数据源  
              dgvShow.DataSource = dt;  
          }  

      }  
  }