//這裡加新增一個excel物件的包裝器。就是新增一個引用

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;

namespace ExcelTest
{
 /// <summary>
 /// Form3 的摘要說明。
 /// </summary>
 public class Form3 : System.Windows.Forms.Form
 {
  private System.Windows.Forms.Button button1;
  private System.Windows.Forms.ComboBox comboBox1;
  /// <summary>
  /// 必需的設計器變數。
  /// </summary>
  private System.ComponentModel.Container components = null;
  // Excel object references.
  private Excel.Application m_objExcel =  null;
  private Excel.Workbooks m_objBooks = null;
  private Excel._Workbook m_objBook = null;
  private Excel.Sheets m_objSheets = null;
  private Excel._Worksheet m_objSheet = null;
  private Excel.Range m_objRange =  null;
  private Excel.Font m_objFont = null;
  private Excel.QueryTables m_objQryTables = null;
  private Excel._QueryTable m_objQryTable = null;

  // Frequenty-used variable for optional arguments.
  private object m_objOpt = System.Reflection.Missing.Value;

  // Paths used by the sample code for accessing and storing data.
  private string m_strNorthwind = @"C:/Program Files/Microsoft Visual Studio/VB98/NWIND.MDB";

  public Form3()
  {
   //
   // Windows 窗體設計器支援所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 呼叫後新增任何建構函式程式碼
   //
  }

  /// <summary>
  /// 清理所有正在使用的資源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if(components != null)
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗體設計器生成的程式碼
  /// <summary>
  /// 設計器支援所需的方法 - 不要使用程式碼編輯器修改
  /// 此方法的內容。
  /// </summary>
  private void InitializeComponent()
  {
   this.button1 = new System.Windows.Forms.Button();
   this.comboBox1 = new System.Windows.Forms.ComboBox();
   this.SuspendLayout();
   //
   // button1
   //
   this.button1.Location = new System.Drawing.Point(208, 136);
   this.button1.Name = "button1";
   this.button1.Size = new System.Drawing.Size(128, 32);
   this.button1.TabIndex = 0;
   this.button1.Text = "button1";
   this.button1.Click += new System.EventHandler(this.button1_Click);
   //
   // comboBox1
   //
   this.comboBox1.Location = new System.Drawing.Point(112, 40);
   this.comboBox1.Name = "comboBox1";
   this.comboBox1.Size = new System.Drawing.Size(376, 20);
   this.comboBox1.TabIndex = 1;
   this.comboBox1.Text = "comboBox1";
   //
   // Form3
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(544, 333);
   this.Controls.Add(this.comboBox1);
   this.Controls.Add(this.button1);
   this.Name = "Form3";
   this.Text = "Form3";
   this.Load += new System.EventHandler(this.Form3_Load);
   this.ResumeLayout(false);

  }
  #endregion

  [STAThread]
  static void Main()
  {
   Application.Run(new Form3());
  }

  private void Form3_Load(object sender, System.EventArgs e)
  {
   comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;

   comboBox1.Items.AddRange(new object[]{
              "Use Automation to Transfer Data Cell by Cell ",
              "Use Automation to Transfer an Array of Data to a Range on a Worksheet ",
              "Use Automation to Transfer an ADO Recordset to a Worksheet Range ",
              "Use Automation to Create a QueryTable on a Worksheet",
              "Use the Clipboard",
              "Create a Delimited Text File that Excel Can Parse into Rows and Columns",
              "Transfer Data to a Worksheet Using ADO.NET "});
   comboBox1.SelectedIndex = 0;
   button1.Text = "Go!";

  }

  private void button1_Click(object sender, System.EventArgs e)
  {
   switch (comboBox1.SelectedIndex)
   {
    case 0 : Automation_CellByCell(); break;
    case 1 : Automation_UseArray(); break;
    case 2 : Automation_ADORecordset(); break;
    case 3 : Automation_QueryTable(); break;
    case 4 : Use_Clipboard(); break;
    case 5 : Create_TextFile(); break;
    case 6 : Use_ADONET(); break;
   }
 
   //Clean-up
   m_objFont = null;
   m_objRange = null;
   m_objSheet = null;
   m_objSheets = null;
   m_objBooks = null;
   m_objBook = null;
   m_objExcel = null;
   GC.Collect();

  }
  private void Automation_CellByCell()
  {
   // Start a new workbook in Excel.
   m_objExcel = new Excel.Application();
   m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
   m_objBook = (Excel._Workbook)(m_objBooks.Add(m_objOpt));

   // Add data to cells of the first worksheet in the new workbook.
   m_objSheets = (Excel.Sheets)m_objBook.Worksheets;
   m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));
   m_objRange = m_objSheet.get_Range("A1", m_objOpt);
   m_objRange.set_Value(m_objOpt,"Last Name");
   m_objRange = m_objSheet.get_Range("B1", m_objOpt);
   m_objRange.set_Value(m_objOpt,"First Name");
   m_objRange = m_objSheet.get_Range("A2", m_objOpt);
   m_objRange.set_Value(m_objOpt,"Doe");
   m_objRange = m_objSheet.get_Range("B2", m_objOpt);
   m_objRange.set_Value(m_objOpt,"John");

   // Apply bold to cells A1:B1.
   m_objRange = m_objSheet.get_Range("A1", "B1");
   m_objFont = m_objRange.Font;
   m_objFont.Bold=true;

   // Save the workbook and quit Excel.
   m_objBook.SaveAs(Application.StartupPath + "//Book1.xls", m_objOpt, m_objOpt,
    m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange,
    m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt);
   m_objBook.Close(false, m_objOpt, m_objOpt);
   m_objExcel.Quit();

  }

  private void Automation_UseArray()
  {
   // Start a new workbook in Excel.
   m_objExcel = new Excel.Application();
   m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
   m_objBook = (Excel._Workbook)(m_objBooks.Add(m_objOpt));
   m_objSheets = (Excel.Sheets)m_objBook.Worksheets;
   m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));

   // Create an array for the headers and add it to cells A1:C1.
   object[] objHeaders = {"Order ID", "Amount", "Tax"};
   m_objRange = m_objSheet.get_Range("A1", "C1");
   m_objRange.set_Value(m_objOpt,objHeaders);
   m_objFont = m_objRange.Font;
   m_objFont.Bold=true;

   // Create an array with 3 columns and 100 rows and add it to
   // the worksheet starting at cell A2.
   object[,] objData = new Object[100,3];
   Random rdm = new Random((int)DateTime.Now.Ticks);
   double nOrderAmt, nTax;
   for(int r=0;r<100;r++)
   {
    objData[r,0] = "ORD" + r.ToString("0000");
    nOrderAmt = rdm.Next(1000);
    objData[r,1] = nOrderAmt.ToString("c");
    nTax = nOrderAmt*0.07;
    objData[r,2] = nTax.ToString("c");
   }
   m_objRange = m_objSheet.get_Range("A2", m_objOpt);
   m_objRange = m_objRange.get_Resize(100,3);
   m_objRange.set_Value(m_objOpt,"objData");
           
   // Save the workbook and quit Excel.
   m_objBook.SaveAs(Application.StartupPath + "//Book2.xls", m_objOpt, m_objOpt,
    m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange,
    m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt);
   m_objBook.Close(false, m_objOpt, m_objOpt);
   m_objExcel.Quit();

  }

  private void Automation_ADORecordset()
  {
   // Create a Recordset from all the records in the Orders table.
   ADODB.Connection objConn = new ADODB.Connection();
   ADODB._Recordset objRS = null;
   objConn.Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
    m_strNorthwind + ";", "", "", 0);
   objConn.CursorLocation = ADODB.CursorLocationEnum.adUseClient;
   object objRecAff;
   objRS = (ADODB._Recordset)objConn.Execute("Orders", out objRecAff,
    (int)ADODB.CommandTypeEnum.adCmdTable);

   // Start a new workbook in Excel.
   m_objExcel = new Excel.Application();
   m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
   m_objBook = (Excel._Workbook)(m_objBooks.Add(m_objOpt));
   m_objSheets = (Excel.Sheets)m_objBook.Worksheets;
   m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));

   // Get the Fields collection from the recordset and determine
   // the number of fields (or columns).
   System.Collections.IEnumerator objFields = objRS.Fields.GetEnumerator();
   int nFields = objRS.Fields.Count;

   // Create an array for the headers and add it to the
   // worksheet starting at cell A1.
   object[] objHeaders = new object[nFields];
   ADODB.Field objField = null;
   for(int n=0;n<nFields;n++)
   {
    objFields.MoveNext();
    objField = (ADODB.Field)objFields.Current;
    objHeaders[n] = objField.Name;
   }
   m_objRange = m_objSheet.get_Range("A1", m_objOpt);
   m_objRange = m_objRange.get_Resize(1, nFields);
   m_objRange.set_Value(m_objOpt,objHeaders);
   m_objFont = m_objRange.Font;
   m_objFont.Bold=true;

   // Transfer the recordset to the worksheet starting at cell A2.
   m_objRange = m_objSheet.get_Range("A2", m_objOpt);
   m_objRange.CopyFromRecordset(objRS, m_objOpt, m_objOpt);

   // Save the workbook and quit Excel.
   m_objBook.SaveAs(Application.StartupPath + "//Book3.xls", m_objOpt, m_objOpt,
    m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange,
    m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt);
   m_objBook.Close(false, m_objOpt, m_objOpt);
   m_objExcel.Quit();

   //Close the recordset and connection
   objRS.Close();
   objConn.Close();

  }

  private void Automation_QueryTable()
  {
   // Start a new workbook in Excel.
   m_objExcel = new Excel.Application();
   m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
   m_objBook = (Excel._Workbook)(m_objBooks.Add(m_objOpt));

   // Create a QueryTable that starts at cell A1.
   m_objSheets = (Excel.Sheets)m_objBook.Worksheets;
   m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));
   m_objRange = m_objSheet.get_Range("A1", m_objOpt);
   m_objQryTables = m_objSheet.QueryTables;
   m_objQryTable = (Excel._QueryTable)m_objQryTables.Add(
    "OLEDB;Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" +
    m_strNorthwind + ";", m_objRange, "Select * From Orders");
   m_objQryTable.RefreshStyle = Excel.XlCellInsertionMode.xlInsertEntireRows;
   m_objQryTable.Refresh(false);

   // Save the workbook and quit Excel.
   m_objBook.SaveAs(Application.StartupPath + "//Book4.xls", m_objOpt, m_objOpt,
    m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange, m_objOpt, m_objOpt,
    m_objOpt, m_objOpt, m_objOpt);
   m_objBook.Close(false, m_objOpt, m_objOpt);
   m_objExcel.Quit();

  }

  private void Use_Clipboard()
  {
   // Copy a string to the clipboard.
   string sData = "FirstName/tLastName/tBirthdate/r/n"  +
    "Bill/tBrown/t2/5/85/r/n"  +
    "Joe/tThomas/t1/1/91";
   System.Windows.Forms.Clipboard.SetDataObject(sData);

   // Start a new workbook in Excel.
   m_objExcel = new Excel.Application();
   m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
   m_objBook = (Excel._Workbook)(m_objBooks.Add(m_objOpt));

   // Paste the data starting at cell A1.
   m_objSheets = (Excel.Sheets)m_objBook.Worksheets;
   m_objSheet = (Excel._Worksheet)(m_objSheets.get_Item(1));
   m_objRange = m_objSheet.get_Range("A1", m_objOpt);
   m_objSheet.Paste(m_objRange, false);

   // Save the workbook and quit Excel.
   m_objBook.SaveAs(Application.StartupPath + "//Book5.xls", m_objOpt, m_objOpt,
    m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange, m_objOpt, m_objOpt,
    m_objOpt, m_objOpt, m_objOpt);
   m_objBook.Close(false, m_objOpt, m_objOpt);
   m_objExcel.Quit();

  }

  private void Create_TextFile()
  {
   // Connect to the data source.
   System.Data.OleDb.OleDbConnection objConn = new System.Data.OleDb.OleDbConnection(
    "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + m_strNorthwind + ";");
   objConn.Open();

   // Execute a command to retrieve all records from the Employees  table.
   System.Data.OleDb.OleDbCommand objCmd = new System.Data.OleDb.OleDbCommand(
    "Select * From Employees", objConn);
   System.Data.OleDb.OleDbDataReader objReader;
   objReader = objCmd.ExecuteReader();

   // Create the FileStream and StreamWriter object to write
   // the recordset contents to file.
   System.IO.FileStream fs = new System.IO.FileStream(
    Application.StartupPath + "//Book6.txt", System.IO.FileMode.Create);
   System.IO.StreamWriter sw = new System.IO.StreamWriter(
    fs, System.Text.Encoding.Unicode);

   // Write the field names (headers) as the first line in the text file.
   sw.WriteLine(objReader.GetName(0) +  "/t" + objReader.GetName(1) +
    "/t" + objReader.GetName(2) + "/t" + objReader.GetName(3) +
    "/t" + objReader.GetName(4) + "/t" + objReader.GetName(5));

   // Write the first six columns in the recordset to a text file as
   // tab-delimited.
   while(objReader.Read())
   {
    for(int i=0;i<=5;i++)
    {
     if(!objReader.IsDBNull(i))
     {
      string s;
      s = objReader.GetDataTypeName(i);
      if(objReader.GetDataTypeName(i)=="DBTYPE_I4")
      {
       sw.Write(objReader.GetInt32(i).ToString());
      }
      else if(objReader.GetDataTypeName(i)=="DBTYPE_DATE")
      {
       sw.Write(objReader.GetDateTime(i).ToString("d"));
      }
      else if (objReader.GetDataTypeName(i)=="DBTYPE_WVARCHAR")
      {
       sw.Write(objReader.GetString(i));
      }
     }
     if(i<5) sw.Write("/t");
    }
    sw.WriteLine();
   }
   sw.Flush(); // Write the buffered data to the FileStream.

   // Close the FileStream.
   fs.Close();

   // Close the reader and the connection.
   objReader.Close();
   objConn.Close();

   // ==================================================================
   // Optionally, automate Excel to open the text file and save it in the
   // Excel workbook format.

   // Open the text file in Excel.
   m_objExcel = new Excel.Application();
   m_objBooks = (Excel.Workbooks)m_objExcel.Workbooks;
   m_objBooks.OpenText(Application.StartupPath + "//Book6.txt", Excel.XlPlatform.xlWindows, 1,
    Excel.XlTextParsingType.xlDelimited, Excel.XlTextQualifier.xlTextQualifierDoubleQuote,
    false, true, false, false, false, false, m_objOpt, m_objOpt,
    m_objOpt, m_objOpt, m_objOpt, m_objOpt, m_objOpt);

   m_objBook = m_objExcel.ActiveWorkbook;

   // Save the text file in the typical workbook format and quit Excel.
   m_objBook.SaveAs(Application.StartupPath + "//Book6.xls", Excel.XlFileFormat.xlWorkbookNormal,
    m_objOpt, m_objOpt, m_objOpt, m_objOpt, Excel.XlSaveAsAccessMode.xlNoChange, m_objOpt, m_objOpt,
    m_objOpt, m_objOpt, m_objOpt);
   m_objBook.Close(false, m_objOpt, m_objOpt);
   m_objExcel.Quit();

  }

  private void Use_ADONET()
  {
   // Establish a connection to the data source.
   System.Data.OleDb.OleDbConnection objConn = new System.Data.OleDb.OleDbConnection(
    "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "//Book7.xls;Extended Properties=Excel 8.0;");
   objConn.Open();

   // Add two records to the table named 'MyTable'.
   System.Data.OleDb.OleDbCommand objCmd = new System.Data.OleDb.OleDbCommand();
   objCmd.Connection = objConn;
   objCmd.CommandText = "Insert into MyTable (FirstName, LastName)" +
    " values ('Bill', 'Brown')";
 
   objCmd.ExecuteNonQuery();
   objCmd.CommandText = "Insert into MyTable (FirstName, LastName)" +
    " values ('Joe', 'Thomas')";
   objCmd.ExecuteNonQuery();

   // Close the connection.
   objConn.Close();

  }

 // End Class

 }
}