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");
}
}
