SqlParameterCollection仅接受非空的SqlParameter类型对象。 参数名称：值

Question

我有一个将数据保存到数据库的注册页面，唯一的问题是当我单击注册按钮时，我收到一个错误消息，该消息不是很确定如何解决，请参阅下文。

Answer 1

Your declaring param[] to have 6 elements, but you're only using 5. The last one is null so you're getting the error on the last iteration of your for loop where you add the elements to the SqlParameterCollection .

It would be much cleaner/easier to do the following rather than declaring an array, filling the array, and then trying to copy the array:

cmd.Parameters.AddWithValue("@Name", name);
cmd.Parameters.AddWithValue("@Gender", gender);
cmd.Parameters.AddWithValue("@Age", age);
cmd.Parameters.AddWithValue("@Address", address);
cmd.Parameters.AddWithValue("@Email", email);