通過OLDB連接到Excel時文件權限錯誤

Question

下面的代碼在我第一次訪問文件以進行行計數時正常工作。但是，當我試圖打開相同的文件來讀取數據時，我在ExcelConnection.Open（）上發生錯誤，它指出我沒有權限訪問該文件或者它已被使用。任何想到爲什麼該文件在第一次連接到它後沒有被釋放？

public static DataSet GetExcelWorkSheet(string pathName, string fileName) 
     { 
      string fileExtention = System.IO.Path.GetExtension(fileName).ToLower(); 

      OleDbConnection ExcelConnection = new OleDbConnection(fileExtention == ".xls" ? 
       @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + pathName + @"\" + fileName + ";Extended Properties=\"Excel 8.0;HDR=No;IMEX=1;ReadOnly=true;\"" : 
       @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + pathName + @"\" + fileName + ";Extended Properties=\"Excel 12.0;HDR=No;IMEX=1;ReadOnly=true;\""); 
      OleDbCommand ExcelCommand = new OleDbCommand(); 
      ExcelCommand.Connection = ExcelConnection; 
      OleDbDataAdapter ExcelAdapter = new OleDbDataAdapter(ExcelCommand); 
      ExcelConnection.Open(); 

      // DataTable ExcelSheets = ExcelConnection.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" }); 
      DataTable ExcelSheets = ExcelConnection.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null); 

      string CheckSheetName = ExcelSheets.Rows[0]["TABLE_NAME"].ToString(); 
      string SpreadSheetName; 
      int useMe = -1; 

      if (CheckSheetName.ToUpper() != "SHEET1$")     // Ok, they have renamed things 
      { 
       if (CheckSheetName.Substring(0, 5).ToUpper() == "SHEET") 
       // if it does START with sheet then look for anything that 
       // DOES NOT start with sheet 
       { 
        for (int x = 0; x < ExcelSheets.Rows.Count; x++) 
        { 
         if (ExcelSheets.Rows[x]["TABLE_NAME"].ToString().Substring(0, 5).ToUpper() != "SHEET") // If is does not equal sheet then use it 
         { 
          useMe = x; 
         } 
        } 
       } 
      } 

      SpreadSheetName = string.Format("[{0}]", useMe == -1 ? CheckSheetName : ExcelSheets.Rows[useMe]["TABLE_NAME"].ToString()); 

      try 
      { 
       DataSet ExcelDataSet = new DataSet(); 
       ExcelCommand.CommandText = @"SELECT * FROM " + SpreadSheetName; 
       ExcelAdapter.Fill(ExcelDataSet); 
       return ExcelDataSet; 
      } 
      catch (Exception) 
      { 
       ExcelConnection.Close(); 
       return new DataSet(); 
      } 
      finally 
      { 
       // Clean up. 
       if (ExcelConnection != null) 
       { 
        ExcelConnection.Close(); 
        ExcelConnection.Dispose(); 
       } 
       if (ExcelSheets != null) 
       { 
        ExcelSheets.Dispose(); 
       } 
      } 
     } 
    } 

Answer 1

該文件已被閱讀或者你有操作odne完成後，必須關閉引黃....

ExcelConnection.Close（）;