Question

错误：一个或多个缺少的参数。

private void tsLblCustomers_Click(object sender, EventArgs e)
    {
        pnlMain.Controls.Clear();
        CustomerReport cr = new CustomerReport();
        cr.TopLevel = false;
        cr.AutoScroll = true;
        cr.BackColor = Color.White;
        pnlMain.Controls.Add(cr);
        cr.Show();
    }

    private void tsLblEmployees_Click(object sender, EventArgs e)
    {
        pnlMain.Controls.Clear();
        EmployeeReport emp = new EmployeeReport();
        emp.TopLevel = false;
        emp.AutoScroll = true;
        emp.BackColor = Color.White;
        pnlMain.Controls.Add(emp);
        emp.Show();

    }

    private void tsLblVendors_Click(object sender, EventArgs e)
    {
        pnlMain.Controls.Clear();
        VendorReport vend = new VendorReport();
        vend.TopLevel = false;
        vend.AutoScroll = true;
        vend.BackColor = Color.White;
        pnlMain.Controls.Add(vend);
        vend.Show();

    }

    private void MainForm_Load(object sender, EventArgs e)
    {
        WelcomeForm welcome = new WelcomeForm();
        welcome.TopLevel = false;
        welcome.AutoScroll = true;
        welcome.BackColor = Color.White;
        pnlMain.Controls.Add(welcome);
        welcome.Show();
    }

Answer 1

列名protectioncode错误。

"SELECT protectioncode FROM settings"将为您提供例外情况＆＃34;没有给出一个或多个必需参数的值。＆＃34;如果protectioncode不是该表中的有效列名。

如果您将查询更改为SELECT * from settings，则会在MyDataReader("protectioncode")上失败，因为＆＃34;保护代码＆＃34;不是列名之一。

设置OLEDB连接时出错

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