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如何通过oledb阅读器在Excel中检查单元格是否包含公式？

System.Data.OleDb.OleDbConnection conn2 = new System.Data.OleDb.OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0; Data Source = " + strFileName + "; Extended Properties = \"Excel 8.0;HDR=NO;IMEX=1\";");
conn2.Open();
string strQuery2 = "SELECT * FROM [" + Table + "]";

System.Data.OleDb.OleDbDataAdapter adapter2 = new System.Data.OleDb.OleDbDataAdapter(strQuery2, conn2);

System.Data.DataTable DT2 = new System.Data.DataTable();

adapter2.Fill(DT2);