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问题描述
所以在修复了一个错误后,我得到 studentHelperClass.Form1.cmbBox 由于其保护级别而无法访问我在启动我的程序时遇到了这个错误 Error reading the database, method or操作没有被我的错误标签实现.
So after fixing an error where I was getting studentHelperClass.Form1.cmbBox is inaccessible due to its protection level I got this error when I launched my prorgam Error reading the database, method or operation is not implemented by my error label.
这是我的代码:
public partial class Form1 : Form { MySqlConnection conn; // connection object; string connstring = "server=localhost;user Id=root;database=collegesystem;Convert Zero Datetime=True "; public Form1() { InitializeComponent(); connection(); selectStudent(); } private void selectStudent() { try { studentHelperClass.studentHC.insertMethod(); } catch (Exception err) { lblInfo.Text = " Error reading the database."; lblInfo.Text += err.Message; } }那是表单的代码,下面是带有方法的类
That is the code for the form, the following is the class with the method
class studentHC : Form1 { public studentHC() { InsertMethod(); } private void InsertMethod() { MySqlConnection conn; // connection object; string connstring = "server=localhost;user Id=root;database=collegesystem;Convert Zero Datetime=True "; conn = new MySqlConnection(connstring); conn.Open(); using (var command = new MySqlCommand("SELECT * FROM person", conn)) { using (var myReader = command.ExecuteReader()) { cmbBox.Items.Add(myReader["personID"]); } } } internal static void insertMethod() { throw new NotImplementedException(); } }任何输入将不胜感激
好的,所以我摆脱了
internal static void insertMethod() { throw new NotImplementedException(); }我变了
public studentHC() { InsertMethod(); } private void InsertMethod()到
public studentHC() { insertMethod(); } private void insertMethod()现在它说studentHelperClass.studentHC.insertMethod()'由于其保护级别而无法访问
推荐答案用这个替换你的 studentHC 类
replace your studentHC class with this
class studentHC : Form1 { public studentHC() { InsertMethod(); } public static void InsertMethod() { MySqlConnection conn; // connection object; string connstring = "server=localhost;user Id=root;database=collegesystem;Convert Zero Datetime=True "; conn = new MySqlConnection(connstring); conn.Open(); using (var command = new MySqlCommand("SELECT * FROM person", conn)) { using (var myReader = command.ExecuteReader()) { cmbBox.Items.Add(myReader["personID"]); } } } }然后替换
studentHelperClass.studentHC.insertMethod();与
studentHelperClass.studentHC.InsertMethod();更多推荐
读取数据库出错,方法或操作未实现
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