c#中使用excel

在做一个小项目，需要把一些查询结果导出到Excel，找了一些资料，自己也总结出了一点方法，与大家共享。

一、首先简要描述一下如何操作Excel表

先要添加对Excel的引用。选择项目-〉添加引用-〉COM-〉添加Microsoft Excel 9.0。（不同的office讲会有不同版本的dll文件）。
using Excel;
using System.Reflection;

//产生一个Excel.Application的新进程
Excel.Application app = new Excel.Application();
if (app == null)
{
statusBar1.Text = "ERROR: EXCEL couldn''t be started!";
return ;
}

app.Visible = true; //如果只想用程序控制该excel而不想让用户操作时候，可以设置为false
app.UserControl = true;

Workbooks workbooks =app.Workbooks;

_Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet); //根据模板产生新的workbook
// _Workbook workbook = workbooks.Add("c://a.xls"); //或者根据绝对路径打开工作簿文件a.xls

Sheets sheets = workbook.Worksheets;
_Worksheet worksheet = (_Worksheet) sheets.get_Item(1);
if (worksheet == null)
{
statusBar1.Text = "ERROR: worksheet == null";
return;
}

// This paragraph puts the value 5 to the cell G1
Range range1 = worksheet.get_Range("A1", Missing.Value);
if (range1 == null)
{
statusBar1.Text = "ERROR: range == null";
return;
}
const int nCells = 2345;
range1.Value2 = nCells;

二、示例程序

1. 在Visual Studio .NET中建立一个C# WinForm工程.
2. 添加Microsoft Excel Object Library引用:
1. 右键单击Project , 选“添加引用”
2. 在COM 标签项，选中 locate Microsoft Excel Object Library
3. 点确定按钮完成添加引用。 On the View menu, select Toolbox to display the Toolbox. Add two buttons and a check box to Form1.
3. 在Form1上添加一个button1，双击 Button1，添加click事件的代码.把数组里的数据填到Excel表格。

         首先添加引用：

          using System.Reflection; 
          using Excel = Microsoft.Office.Interop.Excel;

     声明两个类的成员变量     

      Excel.Application objApp;
      Excel._Workbook objBook;

      private void button1_Click(object sender, System.EventArgs e)
      {
         Excel.Workbooks objBooks;
         Excel.Sheets objSheets;
         Excel._Worksheet objSheet;
         Excel.Range range;

         try
         {
            // Instantiate Excel and start a new workbook.
            objApp = new Excel.Application();
            objBooks = objApp.Workbooks;
            objBook = objBooks.Add( Missing.Value );
            objSheets = objBook.Worksheets;
            objSheet = (Excel._Worksheet)objSheets.get_Item(1);

            //Get the range where the starting cell has the address
            //m_sStartingCell and its dimensions are m_iNumRows x m_iNumCols.
            range = objSheet.get_Range("A1", Missing.Value);
            range = range.get_Resize(5, 5);

            if (this.FillWithStrings.Checked == false)
            {
               //Create an array.
               double[,] saRet = new double[5, 5];

               //Fill the array.
               for (long iRow = 0; iRow < 5; iRow++)
               {
                  for (long iCol = 0; iCol < 5; iCol++)
                  {
                     //Put a counter in the cell.
                     saRet[iRow, iCol] = iRow * iCol;
                  }
               }

               //Set the range value to the array.
               range.set_Value(Missing.Value, saRet );
            }

            else
            {
               //Create an array.
               string[,] saRet = new string[5, 5];

               //Fill the array.
               for (long iRow = 0; iRow < 5; iRow++)
               {
                  for (long iCol = 0; iCol < 5; iCol++)
                  {
                     //Put the row and column address in the cell.
                     saRet[iRow, iCol] = iRow.ToString() + "|" + iCol.ToString();
                  }
               }

               //Set the range value to the array.
               range.set_Value(Missing.Value, saRet );
            }

            //Return control of Excel to the user.
            objApp.Visible = true;
            objApp.UserControl = true;
         }
         catch( Exception theException ) 
         {
            String errorMessage;
            errorMessage = "Error: ";
            errorMessage = String.Concat( errorMessage, theException.Message );
            errorMessage = String.Concat( errorMessage, " Line: " );
            errorMessage = String.Concat( errorMessage, theException.Source );

            MessageBox.Show( errorMessage, "Error" );
         }
      }
					

4.在Form1上添加一个Button2，双击 Button2，添加click事件的代码，从Excel表格读数据到数组:

private void button2_Click(object sender, System.EventArgs e)
      {
         Excel.Sheets objSheets;
         Excel._Worksheet objSheet;
         Excel.Range range;

         try
         {
            try
            {
               //Get a reference to the first sheet of the workbook.
               objSheets = objBook.Worksheets;
               objSheet = (Excel._Worksheet)objSheets.get_Item(1);
            }

            catch( Exception theException ) 
            {
               String errorMessage;
               errorMessage = "Can't find the Excel workbook.  Try clicking Button1 " +
                  "to create an Excel workbook with data before running Button2.";

               MessageBox.Show( errorMessage, "Missing Workbook?");

               //You can't automate Excel if you can't find the data you created, so 
               //leave the subroutine.
               return;
            }

            //Get a range of data.
            range = objSheet.get_Range("A1", "E5");

            //Retrieve the data from the range.
            Object[,] saRet;
            saRet = (System.Object[,])range.get_Value( Missing.Value );

            //Determine the dimensions of the array.
            long iRows;
            long iCols;
            iRows = saRet.GetUpperBound(0);
            iCols = saRet.GetUpperBound(1);

            //Build a string that contains the data of the array.
            String valueString;
            valueString = "Array Data/n";

            for (long rowCounter = 1; rowCounter <= iRows; rowCounter++)
            {
               for (long colCounter = 1; colCounter <= iCols; colCounter++)
               {

                  //Write the next value into the string.
                  valueString = String.Concat(valueString,
                     saRet[rowCounter, colCounter].ToString() + ", ");
               }

               //Write in a new line.
               valueString = String.Concat(valueString, "/n");
            }

            //Report the value of the array.
            MessageBox.Show(valueString, "Array Values");
         }

         catch( Exception theException ) 
         {
            String errorMessage;
            errorMessage = "Error: ";
            errorMessage = String.Concat( errorMessage, theException.Message );
            errorMessage = String.Concat( errorMessage, " Line: " );
            errorMessage = String.Concat( errorMessage, theException.Source );

            MessageBox.Show( errorMessage, "Error" );
         }
      }