插入值

Question

为什么这个代码不工作，我尝试插入从文本框表，专业，课程的学生证和学生的名字从下拉列表中

int sID = Convert.ToInt32(TextBox1.Text); 
string Name = TextBox2.Text; 
var mjr = DropDownList1.SelectedItem.Value; 
var crs = DropDownList2.SelectedItem.Text; 

string registered = "insert into Registered (Student_name, StudentID, Major, Course) values(@sName ,@SID, @major , @course)"; 

while (reader.Read()) 
{ 
    ints.Add(reader.GetInt32(0)); 

    if (a.Count() <= ints.Count() && !a.Except(ints).Any()) 
    { 
     SqlCommand com4 = new SqlCommand(registered, con); 

     com4.Parameters.AddWithValue("sName", Name); 
     com4.Parameters.AddWithValue("SID", sID); 
     com4.Parameters.AddWithValue("major", mjr); 
     com4.Parameters.AddWithValue("course", crs); 
     com4.ExecuteNonQuery(); 

Answer 1

你需要添加带标量属性名称的“@”

com4.Parameters.AddWithValue("@sName", Name); 
com4.Parameters.AddWithValue("@SID", sID); 
com4.Parameters.AddWithValue("@major", mjr); 
com4.Parameters.AddWithValue("@course", crs); 
com4.ExecuteNonQuery();