OleDbParameterCollection不包含參數名「」的OleDbParameter

Question

我不斷收到參數名稱錯誤？在底部，我附上了一張圖片來幫助解釋問題。

private void loadProgress(string jobNumber) 
    { 

     productioninfo.Open(); 

     OleDbCommand _contractReview = new OleDbCommand ("SELECT [Contract Review] FROM [Main$] WHERE [Job No] = '@Job No'", productioninfo); 
     _contractReview.Parameters.Add("@Job No", OleDbType.Char); 
     _contractReview.Parameters["Job No"].Value = jobNumber; 

     OleDbDataReader dr = _contractReview.ExecuteReader(); 

     while (dr.Read()) 
     { 

     } 
     dr.Close(); 

    } 

Answer 1

嘗試這樣;

OleDbCommand _contractReview = new OleDbCommand ("SELECT [Contract Review] FROM [Main$] WHERE [Job No] = @JobNo", productioninfo); 
_contractReview.Parameters.Add("@JobNo", OleDbType.Char); 
_contractReview.Parameters["JobNo"].Value = jobNumber; 

並且不要在表名和列名中使用空格。不推薦。

結賬Database, Table and Column Naming Conventions?