Sql server SQL Server:插入参数null，但在C中有值#

运行此代码时，会出现以下异常：

无法将值NULL插入表“G2A.dbo.MultipleAnswerName”的列“MultipleAnswerNameID”中；列不允许空值。插入失败

MultiAnswerNameID有一个值，即使在调试时

当程序运行到以下代码时引发异常：

rows += command.ExecuteNonQuery();

我的代码：

SqlCommand command = null;
int rows = 0;

using (SqlConnection connection = G2ADB.GetConnection())
{
    connection.Open();
    SqlTransaction transaction = connection.BeginTransaction();
    int answerID = addAnswer((int)G2A.Type.MultipleAnswer, transaction, connection);

    try
    {
        SqlParameter prmanswerID = new SqlParameter("@answerid", answerID);

        command = new SqlCommand("INSERT MultipleAnswer (AnswerID) VALUES (@answerid)", connection, transaction);
        command.Parameters.Add(prmanswerID);

        rows += command.ExecuteNonQuery();

        if (rows == 1)
        {
           DebugMess.debugMessage("Added answer");
        }

        rows = 0;
        DebugMess.debugMessage(answerID.ToString());

        for (int i = 0; i < answers.GetLength(0); i++)
        {
            command.Parameters.Clear();
            command.CommandText = "INSERT MultipleAnswerName (MultipleAnswerName, MultipleAnswerCorrect,MultipleAnswerID) VALUES (@answerName,@answerCor,@multianswerid)";

            SqlParameter prmopenanswerid = new SqlParameter("@multianswerid", answerID);
            SqlParameter prmanswerName = new SqlParameter("@answerName", answers[i, 0]);
            SqlParameter prmanswerVariable = new SqlParameter("@answerCor", answers[i, 1]);

            command.Parameters.Add(prmopenanswerid);
            command.Parameters.Add(prmanswerName);
            command.Parameters.Add(prmanswerVariable);

            rows += command.ExecuteNonQuery();
         }

         if (rows == answers.GetLength(0))
         {
            transaction.Commit();
            DebugMess.debugMessage("Transaction of the answer committed.");
         }
      }
      catch (Exception ex)
      {
          transaction.Rollback();
          DebugMess.debugMessage("Transaction of the answer failed.\r\n\r\n" + ex.Message);
      }
      finally
      {
          connection.Close();
      }
      return answerID;

SqlCommand=null；
int行=0；
使用（SqlConnection connection=G2ADB.GetConnection（））
{
connection.Open（）；
SqlTransaction=connection.BeginTransaction（）；
int answerID=addAnswer（（int）G2A.Type.MultipleAnswer，事务，连接）；
尝试
{
SqlParameter prmanswerID=新的SqlParameter（“@answerid”，answerid）；
command=newsqlcommand（“插入多个answer（AnswerID）值（@AnswerID）”，连接，事务）；
命令.Parameters.Add（prmanswerID）；
行+=命令。ExecuteOnQuery（）；
如果（行==1）
{
DebugMess.debugMessage（“添加的答案”）；
}
行=0；
DebugMess.debugMessage（answerID.ToString（））；
for（int i=0；i

检查您的insert语句。您缺少

到

INSERT into  MultipleAnswer (AnswerID) VALUES (@answerid)

---

换行

command.CommandText = "INSERT MultipleAnswerName (MultipleAnswerName, MultipleAnswerCorrect,MultipleAnswerID) VALUES (@answerName,@answerCor,@multianswerid)";
command = new SqlCommand("INSERT MultipleAnswer (AnswerID) VALUES (@answerid)", connection, transaction);

与

编辑

更改参数顺序

 for (int i = 0; i < answers.GetLength(0); i++)
 {
   command.Parameters.Clear();
   command.CommandText = "INSERT Into MultipleAnswerName (MultipleAnswerName, MultipleAnswerCorrect,MultipleAnswerID) VALUES (@answerName,@answerCor,@multianswerid)";
   SqlParameter prmanswerName = new SqlParameter("@answerName", answers[i, 0]);
   SqlParameter prmanswerVariable = new SqlParameter("@answerCor", answers[i, 1]);
   SqlParameter prmopenanswerid = new SqlParameter("@multianswerid", answerID);

   command.Parameters.Add(prmanswerName);
   command.Parameters.Add(prmanswerVariable);
   command.Parameters.Add(prmopenanswerid);
   rows += command.ExecuteNonQuery();
 }

for（int i=0；i

我已经试过了。它仍然会出现同样的错误。.无论如何，Thx！@RafVandelaer我可以知道你为什么使用rows+=command.ExecuteNonQuery（）吗；这是为了检查更新/更改了多少行。它适用于其他sql命令，只是这个命令做了一些奇怪的事情。当我这样做时，我得到了相同的异常：无法将值NULL插入列'MultipleAnswerNameID'，表'G2A.dbo.MultipleAnswerName'；列不允许NULL。insert失败。语句已终止。C在for循环中放入断点，并确保values@RafVandelaer我已经更新了解决方案。你能检查一下吗？我试过了。同样的错误。但是谢谢你帮我解决了一些屏幕问题。这里解决了一些屏幕问题！创建数据库的家伙忘了设置自动编号…“谢谢你的帮助。MultiAnswerNameID IMultipleAnswerName表中的primarykey是什么？我想您只是错过了在insert语句中输入MultiAnswerNameID，或者如果此字段是自动编号，可能您忘记了将字段标识规范设置为“是”

command.CommandText = "INSERT INTO MultipleAnswerName (MultipleAnswerName, MultipleAnswerCorrect,MultipleAnswerID) VALUES (@answerName,@answerCor,@multianswerid)";
command = new SqlCommand("INSERT INTO MultipleAnswer (AnswerID) VALUES (@answerid)", connection, transaction);

 for (int i = 0; i < answers.GetLength(0); i++)
 {
   command.Parameters.Clear();
   command.CommandText = "INSERT Into MultipleAnswerName (MultipleAnswerName, MultipleAnswerCorrect,MultipleAnswerID) VALUES (@answerName,@answerCor,@multianswerid)";
   SqlParameter prmanswerName = new SqlParameter("@answerName", answers[i, 0]);
   SqlParameter prmanswerVariable = new SqlParameter("@answerCor", answers[i, 1]);
   SqlParameter prmopenanswerid = new SqlParameter("@multianswerid", answerID);

   command.Parameters.Add(prmanswerName);
   command.Parameters.Add(prmanswerVariable);
   command.Parameters.Add(prmopenanswerid);
   rows += command.ExecuteNonQuery();
 }