C#导入导出EXCEL文件的类

代码如下：

首先将Microsoft Excel 14.0 Object Library 引用导入

using System;
using System.Data;
using System.Data.OleDb;

namespace ZFSoft.Joint
{
public class ExcelIO
{
private int _ReturnStatus;
private string _ReturnMessage;

/// <summary>
/// 执行返回状态
/// </summary>
public int ReturnStatus
{
get
{
return _ReturnStatus;
}
}

/// <summary>
/// 执行返回信息
/// </summary>
public string ReturnMessage
{
get
{
return _ReturnMessage;
}
}

public ExcelIO()
{
}

/// <summary>
/// 导入EXCEL到DataSet
/// </summary>
/// <param name="fileName">Excel全路径文件名</param>
/// <returns>导入成功的DataSet</returns>
public DataTable ImportExcel(string fileName)
{
//判断是否安装EXCEL
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
if (xlApp == null)
{
_ReturnStatus = -1;
_ReturnMessage = "无法创建Excel对象，可能您的计算机未安装Excel";
return null;
}

//判断文件是否被其他进程使用
Microsoft.Office.Interop.Excel.Workbook workbook;
try
{
workbook = xlApp.Workbooks.Open(fileName, 0, false, 5, "", "", false, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, "", true, false, 0, true, 1, 0);
}
catch
{
_ReturnStatus = -1;
_ReturnMessage = "Excel文件处于打开状态，请保存关闭";
return null;
}

//获得所有Sheet名称
int n = workbook.Worksheets.Count;
string[] SheetSet = new string
;
System.Collections.ArrayList al = new System.Collections.ArrayList();
for (int i = 1; i <= n; i++)
{
SheetSet[i - 1] = ((Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[i]).Name;
}

//释放Excel相关对象
workbook.Close(null, null, null);
xlApp.Quit();
if (workbook != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
workbook = null;
}
if (xlApp != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
xlApp = null;
}
GC.Collect();

//把EXCEL导入到DataSet
DataSet ds = new DataSet();
DataTable table = new DataTable();
string connStr = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source = " + fileName + ";Extended Properties=Excel 8.0";
using (OleDbConnection conn = new OleDbConnection(connStr))
{
conn.Open();
OleDbDataAdapter da;
string sql = "select * from [" + SheetSet[0] + "$] ";
da = new OleDbDataAdapter(sql, conn);
da.Fill(ds, SheetSet[0]);
da.Dispose();
table = ds.Tables[0];
conn.Close();
conn.Dispose();
}
return table;
}

/// <summary>
/// 把DataTable导出到EXCEL
/// </summary>
/// <param name="reportName">报表名称</param>
/// <param name="dt">数据源表</param>
/// <param name="saveFileName">Excel全路径文件名</param>
/// <returns>导出是否成功</returns>
public bool ExportExcel(string reportName, System.Data.DataTable dt, string saveFileName)
{
if (dt == null)
{
_ReturnStatus = -1;
_ReturnMessage = "数据集为空！";
return false;
}

bool fileSaved = false;
Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
if (xlApp == null)
{
_ReturnStatus = -1;
_ReturnMessage = "无法创建Excel对象，可能您的计
fe6e
算机未安装Excel";
return false;
}

Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[1];//取得sheet1
worksheet.Cells.Font.Size = 10;
Microsoft.Office.Interop.Excel.Range range;

long totalCount = dt.Rows.Count;
long rowRead = 0;
float percent = 0;

worksheet.Cells[1, 1] = reportName;
((Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, 1]).Font.Size = 12;
((Microsoft.Office.Interop.Excel.Range)worksheet.Cells[1, 1]).Font.Bold = true;

//写入字段
for (int i = 0; i < dt.Columns.Count; i++)
{
worksheet.Cells[2, i + 1] = dt.Columns[i].ColumnName;
range = (Microsoft.Office.Interop.Excel.Range)worksheet.Cells[2, i + 1];
range.Interior.ColorIndex = 15;
range.Font.Bold = true;

}
//写入数值
for (int r = 0; r < dt.Rows.Count; r++)
{
for (int i = 0; i < dt.Columns.Count; i++)
{
worksheet.Cells[r + 3, i + 1] = dt.Rows[r][i].ToString();
}
rowRead++;
percent = ((float)(100 * rowRead)) / totalCount;
}
//此行有可能会出错，解决办法见下面
range = worksheet.get_Range(worksheet.Cells[2, 1], worksheet.Cells[dt.Rows.Count + 2, dt.Columns.Count]);
range.BorderAround(Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous, Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin, Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic, null);
if (dt.Rows.Count > 0)
{
range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].ColorIndex = Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic;
range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous;
range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideHorizontal].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
}
if (dt.Columns.Count > 1)
{
range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].ColorIndex = Microsoft.Office.Interop.Excel.XlColorIndex.xlColorIndexAutomatic;
range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].LineStyle = Microsoft.Office.Interop.Excel.XlLineStyle.xlContinuous;
range.Borders[Microsoft.Office.Interop.Excel.XlBordersIndex.xlInsideVertical].Weight = Microsoft.Office.Interop.Excel.XlBorderWeight.xlThin;
}

//保存文件
if (saveFileName != "")
{
try
{
workbook.Saved = true;
workbook.SaveCopyAs(saveFileName);
fileSaved = true;
}
catch (Exception ex)
{
fileSaved = false;
_ReturnStatus = -1;
_ReturnMessage = "导出文件时出错,文件可能正被打开！\n" + ex.Message;
}
}
else
{
fileSaved = false;
}

//释放Excel对应的对象
if (range != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(range);
range = null;
}
if (worksheet != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(worksheet);
worksheet = null;
}
if (workbook != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook);
workbook = null;
}
if (workbooks != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(workbooks);
workbooks = null;
}
xlApp.Application.Workbooks.Close();
xlApp.Quit();
if (xlApp != null)
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(xlApp);
xlApp = null;
}
GC.Collect();
return fileSaved;
}
}
}

这种写法可能出现，Object未包含get_range定义，解决办法是将get_range变为Range：

range = worksheet.Range[worksheet.Cells[2, 1], worksheet.Cells[dt.Rows.Count + 2, dt.Columns.Count]];

调用该类的具体使用，导入表中的数据到dataGridView，实际上也是先到dataset里面：

private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();

ofd.Filter = "Excel Files|*.xlsx";

if (ofd.ShowDialog() == DialogResult.OK)
{

string filename = ofd.FileName;
ExcelIO ex = new ExcelIO();
dataGridView1.DataSource = ex.ImportExcel(filename);

}
}

调用该类的具体使用，从数据库导出到Excel，实际上也是先到dataset里面：

private void button2_Click(object sender, EventArgs e)
{
CarTableAdapter ca = new CarTableAdapter();
DataSet1.CarDataTable table = ca.GetData();

ExcelIO ex = new ExcelIO();
ex.ExportExcel("qiche",table,@"C:\Users\Administrator\Desktop\例子.xlsx");

}