让C# Excel导入导出 支持不同版本Office

问题：最近在项目中遇到，不同客户机安装不同Office版本，在导出Excel时，发生错误。
找不到Excel Com组件，错误信息如下。 
未能加载文件或程序集“Microsoft.Office.Interop.Excel, Version=12.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c”或它的某一个依赖项。系统找不到指定的文件。 

解决方法：

1.引用高版本的的Excel.dll组件，最新版本14.0.0 防止客户安装高版本如Office不能导出。
（DLL组件可以兼容低版本，不能兼容高版本）

2.右键DLL属性，将引用的Excel.dll组件，嵌入互操作类型为True，特定版本=false .这一步非常关键。
嵌入互操作类型 改成True后，生成时可能现有调用Excel的代码会报错，引用Microsoft.CSharp 命名空间，可以解决此问题。

3.引用Excel 14.0.0 DLL组件方法，vs2012 右键添加引用->程序集->扩展->Microsoft.Office.Interop.Excel
Excel.dll：  http://xiazai.jb51.net/201608/yuanma/Excel(jb51.net).rar

其他方法：
1.使用NPOI.DLL开源组件，可以不安装Office软件，进行读写Excel文件。
NPIO.dll：  http://xiazai.jb51.net/201608/yuanma/NPOI(jb51.net).rar

调用方法如下： 

导出代码：

/// <summary>
/// DataTable导出到Excel的MemoryStream Export()
/// </summary>
/// <param name="dtSource">DataTable数据源</param>
/// <param name="strHeaderText">Excel表头文本（例如：车辆列表）</param>
public static MemoryStream Export(DataTable dtSource, string strHeaderText)
{
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet();

#region 右击文件 属性信息
{
 DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
 dsi.Company = "NPOI";
 workbook.DocumentSummaryInformation = dsi;

SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
 si.Author = "文件作者信息"; //填加xls文件作者信息
 si.ApplicationName = "创建程序信息"; //填加xls文件创建程序信息
 si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
 si.Comments = "作者信息"; //填加xls文件作者信息
 si.Title = "标题信息"; //填加xls文件标题信息
 si.Subject = "主题信息";//填加文件主题信息
 si.CreateDateTime = System.DateTime.Now;
 workbook.SummaryInformation = si;
}
#endregion

ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

//取得列宽
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
 arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = 0; i < dtSource.Rows.Count; i++)
{
 for (int j = 0; j < dtSource.Columns.Count; j++)
 {
 int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
 if (intTemp > arrColWidth[j])
 {
  arrColWidth[j] = intTemp;
 }
 }
}
int rowIndex = 0;
foreach (DataRow row in dtSource.Rows)
{
 #region 新建表，填充表头，填充列头，样式
 if (rowIndex == 65535 || rowIndex == 0)
 {
 if (rowIndex != 0)
 {
  sheet = workbook.CreateSheet();
 }

#region 表头及样式
 {
  IRow headerRow = sheet.CreateRow(0);
  headerRow.HeightInPoints = 25;
  headerRow.CreateCell(0).SetCellValue(strHeaderText);

ICellStyle headStyle = workbook.CreateCellStyle();
  headStyle.Alignment = HorizontalAlignment.CENTER;
  IFont font = workbook.CreateFont();
  font.FontHeightInPoints = 20;
  font.Boldweight = 700;
  headStyle.SetFont(font);
  headerRow.GetCell(0).CellStyle = headStyle;
  sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
 }
 #endregion

#region 列头及样式
 {
  IRow headerRow = sheet.CreateRow(1);
  ICellStyle headStyle = workbook.CreateCellStyle();
  headStyle.Alignment = HorizontalAlignment.CENTER;
  IFont font = workbook.CreateFont();
  font.FontHeightInPoints = 10;
  font.Boldweight = 700;
  headStyle.SetFont(font);
  foreach (DataColumn column in dtSource.Columns)
  {
  headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
  headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

//设置列宽
  sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
  }
 }
 #endregion

rowIndex = 2;
 }
 #endregion

#region 填充内容
 IRow dataRow = sheet.CreateRow(rowIndex);
 foreach (DataColumn column in dtSource.Columns)
 {
 ICell newCell = dataRow.CreateCell(column.Ordinal);

string drValue = row[column].ToString();

switch (column.DataType.ToString())
 {
  case "System.String"://字符串类型
  newCell.SetCellValue(drValue);
  break;
  case "System.DateTime"://日期类型
  System.DateTime dateV;
  System.DateTime.TryParse(drValue, out dateV);
  newCell.SetCellValue(dateV);

newCell.CellStyle = dateStyle;//格式化显示
  break;
  case "System.Boolean"://布尔型
  bool boolV = false;
  bool.TryParse(drValue, out boolV);
  newCell.SetCellValue(boolV);
  break;
  case "System.Int16"://整型
  case "System.Int32":
  case "System.Int64":
  case "System.Byte":
  int intV = 0;
  int.TryParse(drValue, out intV);
  newCell.SetCellValue(intV);
  break;
  case "System.Decimal"://浮点型
  case "System.Double":
  double doubV = 0;
  double.TryParse(drValue, out doubV);
  newCell.SetCellValue(doubV);
  break;
  case "System.DBNull"://空值处理
  newCell.SetCellValue("");
  break;
  default:
  newCell.SetCellValue("");
  break;
 }
 }
 #endregion

rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
 workbook.Write(ms);
 ms.Flush();
 ms.Position = 0;
 sheet.Dispose();
 return ms;
}
}

导入代码：

/// <summary>
/// 读取excel ,默认第一行为标头
/// </summary>
/// <param name="strFileName">excel文档路径</param>
/// <returns></returns>
public static DataTable Import(string strFileName)
{
DataTable dt = new DataTable();

HSSFWorkbook hssfworkbook;
using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
{
 hssfworkbook = new HSSFWorkbook(file);
}
ISheet sheet = hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

IRow headerRow = sheet.GetRow(0);
int cellCount = headerRow.LastCellNum;

for (int j = 0; j < cellCount; j++)
{
 ICell cell = headerRow.GetCell(j);
 dt.Columns.Add(cell.ToString());
}

for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
{
 IRow row = sheet.GetRow(i);
 DataRow dataRow = dt.NewRow();

for (int j = row.FirstCellNum; j < cellCount; j++)
 {
 if (row.GetCell(j) != null)
  dataRow[j] = row.GetCell(j).ToString();
 }

dt.Rows.Add(dataRow);
}
return dt;
}

2.使用C#发射方式调用Excel进行，不需要引用Excel.dll组件。此种方法不建议，太麻烦，也需要安装Office。
调用方法如下：

private void Export2Excel(DataGridView datagridview, bool captions)
{
 object objApp_Late;
 object objBook_Late;
 object objBooks_Late;
 object objSheets_Late;
 object objSheet_Late;
 object objRange_Late;
 object[] Parameters;

string[] headers = new string[datagridview.DisplayedColumnCount(true)];
 string[] columns = new string[datagridview.DisplayedColumnCount(true)];
 string[] colName = new string[datagridview.DisplayedColumnCount(true)];

int i = 0;
 int c = 0;
 int m = 0;

for (c = 0; c < datagridview.Columns.Count; c++)
 {
 for (int j = 0; j < datagridview.Columns.Count; j++)
 {
  DataGridViewColumn tmpcol = datagridview.Columns[j];
  if (tmpcol.DisplayIndex == c)
  {
  if (tmpcol.Visible) //不显示的隐藏列初始化为tag＝0
  {
   headers[c - m] = tmpcol.HeaderText;
   i = c - m + 65;
   columns[c - m] = Convert.ToString((char)i);
   colName[c - m] = tmpcol.Name;
  }
  else
  {
   m++;
  }
  break;
  }
 }
 }

try
 {
 // Get the class type and instantiate Excel.
 Type objClassType;
 objClassType = Type.GetTypeFromProgID("Excel.Application");
 objApp_Late = Activator.CreateInstance(objClassType);
 //Get the workbooks collection.
 objBooks_Late = objApp_Late.GetType().InvokeMember("Workbooks", BindingFlags.GetProperty, null, objApp_Late, null);
 //Add a new workbook.
 objBook_Late = objBooks_Late.GetType().InvokeMember("Add", BindingFlags.InvokeMethod, null, objBooks_Late, null);
 //Get the worksheets collection.
 objSheets_Late = objBook_Late.GetType().InvokeMember("Worksheets", BindingFlags.GetProperty, null, objBook_Late, null);
 //Get the first worksheet.
 Parameters = new Object[1];
 Parameters[0] = 1;
 objSheet_Late = objSheets_Late.GetType().InvokeMember("Item", BindingFlags.GetProperty, null, objSheets_Late, Parameters);

if (captions)
 {
  // Create the headers in the first row of the sheet
  for (c = 0; c < datagridview.DisplayedColumnCount(true); c++)
  {
  //Get a range object that contains cell.
  Parameters = new Object[2];
  Parameters[0] = columns[c] + "1";
  Parameters[1] = Missing.Value;
  objRange_Late = objSheet_Late.GetType().InvokeMember("Range", BindingFlags.GetProperty, null, objSheet_Late, Parameters);
  //Write Headers in cell.
  Parameters = new Object[1];
  Parameters[0] = headers[c];
  objRange_Late.GetType().InvokeMember("Value", BindingFlags.SetProperty, null, objRange_Late, Parameters);
  }
 }

// Now add the data from the grid to the sheet starting in row 2
 for (i = 0; i < datagridview.RowCount; i++)
 {
  c = 0;
  foreach (string txtCol in colName)
  {
  DataGridViewColumn col = datagridview.Columns[txtCol];
  if (col.Visible)
  {
   //Get a range object that contains cell.
   Parameters = new Object[2];
   Parameters[0] = columns[c] + Convert.ToString(i + 2);
   Parameters[1] = Missing.Value;
   objRange_Late = objSheet_Late.GetType().InvokeMember("Range", BindingFlags.GetProperty, null, objSheet_Late, Parameters);
   //Write Headers in cell.
   Parameters = new Object[1];
   //Parameters[0] = datagridview.Rows[i].Cells[headers[c]].Value.ToString();
   Parameters[0] = datagridview.Rows[i].Cells[col.Name].Value.ToString();
   objRange_Late.GetType().InvokeMember("Value", BindingFlags.SetProperty, null, objRange_Late, Parameters);
   c++;
  }

}
 }

//Return control of Excel to the user.
 Parameters = new Object[1];
 Parameters[0] = true;
 objApp_Late.GetType().InvokeMember("Visible", BindingFlags.SetProperty,
 null, objApp_Late, Parameters);
 objApp_Late.GetType().InvokeMember("UserControl", BindingFlags.SetProperty,
 null, objApp_Late, Parameters);
 }
 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");
 }
}

System.Type ExcelType = System.Type.GetTypeFromProgID("Excel.Application");
Microsoft.Office.Interop.Excel.Application obj = Activator.CreateInstance(ExcelType) as Microsoft.Office.Interop.Excel.Application;