C# 从数据库加载单词并将其添加到类型 "Choices"的列表中？

Question

我构建了一个从数据库表加载单词的系统，但我需要将这些单词添加到“选择”类型的列表(语法构建所需的类型)。

这是我请求从数据库检索单词的代码:

            List<string> newWords = new List<string>();
            newWords = LexicalOperations.WordLibrary().ToList();

            Choices dbList = new Choices(); //Adding them to a Choice List
            if (newWords.Count != 0)
            {
                foreach (string word in newWords)
                {
                    dbList.Add(word.ToString());
                }
            }
            else dbList.Add("Default");

这是我从表中检索数据的代码:

 public class LexicalOperations
 {
       public static List<string> WordLibrary()
       {
                List<string> WordLibrary = new List<string>();
    
                string conString = "Data Source=.;Initial Catalog=QABase;Integrated Security=True";
    
                using (SqlConnection connection = new SqlConnection(conString))
                {
                    connection.Open();
                    string sqlIns = "select WordList from NewWords";
                    SqlCommand cmd = new SqlCommand(sqlIns, connection);
    
                    SqlDataAdapter sda = new SqlDataAdapter(cmd);
                    DataSet ds = new DataSet();
                    sda.Fill(ds);
    
                    foreach (DataRow dr in ds.Tables[0].Rows)
                    {
                        WordLibrary.Add(dr[0].ToString());
                    }
    
                }
    
                return WordLibrary;
            }
        }

但是，这会引发异常:System.FormatException，它还声明了消息:

FormatException was unhandled

Double-quoted string not valid.

当我在语音语法生成器中构建选择列表时抛出此错误:

GrammarBuilder graBui = new GrammarBuilder(dbList);
Grammar Gra = new Grammar(graBui);

我做错了什么？为了正确地从数据库中检索单词并将它们添加到选择列表中，应该做什么？

Answer 1

问题似乎是您的 Grammar 类无法处理带双引号的字符串。
因此，解决该问题的最简单方法是删除输入中的双引号。

public class LexicalOperations
{
    public static List<string> WordLibrary()
    {
        List<string> WordLibrary = new List<string>();
        string conString = "Data Source=.;Initial Catalog=QABase;Integrated Security=True";

        string sqlIns = "select WordList from NewWords";
        using (SqlConnection connection = new SqlConnection(conString))
        using (SqlCommand cmd = new SqlCommand(sqlIns, connection))
        {
            connection.Open();
            using(SqlDataReader reader = cmd.ExecuteReader())
            {
                while(reader.Read())
                {
                    string noQuotes = reader.GetString(0).Replace("\"", "");
                    WordLibrary.Add(noQuotes);
                    // In alternative you could also opt to not add a string with double quotes
                    // string noQuotes = reader.GetString(0);
                    // if(noQuotes.IndexOf("\"") < 0)
                    //    WordLibrary.Add(noQuotes);
                }
            }
        }
        return WordLibrary;
    }
}

请注意，我还删除了 SqlDataAdapter并填充 DataSet 。在这种情况下，这是无用的，并且显然会阻碍性能，因为您正在执行两个循环。第一个由框架执行以填充数据集，第二个由您的代码执行以将单词添加到 List<string>变量