C#操作EXCEL DataTable轉換的執行個體代碼

複製代碼 代碼如下://載入Excel
public DataSet LoadDataFromExcel(string filePath)
{
try
{
string strConn;
//strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties='Excel 8.0;HDR=False;IMEX=1'";
strConn = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties='Excel 8.0;HDR=Yes;IMEX=1;'", filePath);
OleDbConnection OleConn = new OleDbConnection(strConn);
OleConn.Open();
String sql = "SELECT * FROM [Sheet1$]";//可是更改Sheet名稱，比如sheet2，等等

OleDbDataAdapter OleDaExcel = new OleDbDataAdapter(sql, OleConn);
DataSet OleDsExcle = new DataSet();
OleDaExcel.Fill(OleDsExcle, "Sheet1");
OleConn.Close();
return OleDsExcle;
}
catch (Exception err)
{

return null;
}
}

/// <summary>
/// DataTable直接匯出Excel,此方法會把DataTable的資料用Excel開啟,再自己手動去儲存到確切的位置
/// </summary>
/// <param name="dt">要匯出Excel的DataTable</param>
/// <returns></returns>
public bool DoExport(System.Data.DataTable dt)
{
Microsoft.Office.Interop.Excel.Application app = new ApplicationClass();
if (app == null)
{
throw new Exception("Excel無法啟動");
}
app.Visible = true;
Workbooks wbs = app.Workbooks;
Workbook wb = wbs.Add(Missing.Value);
Worksheet ws = (Worksheet)wb.Worksheets[1];

int cnt = dt.Rows.Count;
int columncnt = dt.Columns.Count;

// *****************擷取資料********************
object[,] objData = new Object[cnt + 1, columncnt]; // 建立快取資料
// 擷取欄位標題
for (int i = 0; i < columncnt; i++)
{
objData[0, i] = dt.Columns[i].ColumnName;
}
// 擷取具體資料
for (int i = 0; i < cnt; i++)
{
System.Data.DataRow dr = dt.Rows[i];
for (int j = 0; j < columncnt; j++)
{
objData[i + 1, j] = dr[j];
}
}

//********************* 寫入Excel******************
Range r = ws.get_Range(app.Cells[1, 1], app.Cells[cnt + 1, columncnt]);
r.NumberFormat = "@";
//r = r.get_Resize(cnt+1, columncnt);
r.Value2 = objData;
r.EntireColumn.AutoFit();

app = null;
return true;
}