【发布时间】：2023-03-21 00:15:01
【问题描述】：
在对管理数据进行了更多阅读和研究之后，我重新编写了基于 MSDN 站点的数据集代码；但是，我遇到了障碍。我相信我已经在类级别内声明了数据集；但是，每当我尝试使用
提取该数据集时DataRow[] drRow = tblEmployee.Select("EmployeeKey = " + TextBox12.Text)
我收到错误：
- 当前上下文中不存在名称“tblEmployees”
- 当前上下文中不存在名称“TextBox12”
我希望能够在类级别声明它，以便可以从表单中的任何位置调用它。
我已经阅读了 MSDN 网站的课程级别，老实说，我认为这让我更加困惑。
基本上我想要发生的是数据集按名字按字母顺序提供员工列表，然后当用户从下拉框中选择员工时，它应该选择员工 ID 并将其显示在 textBox12 中，然后在 tblEmplpoyees 中搜索要为员工显示的剩余数据，例如代码中 //cmets 中定义的字段。
有人可以帮我解决这个问题吗，这是我的代码 atm：
namespace Tempus.Menus
{
public partial class Employees : Form
{
public class myData
{
DataSet[]drRow = tblEmployees.Select("EmployeeKey = " + TextBox12.Text);;
}
public Employees()
{
InitializeComponent();
//Connect to database for Employees Table Headers
SqlConnection myConnection = new SqlConnection(@"Server=server\CHCTEMPUS;Integrated Security=true;" +
"user id=userID;password=password;" +
"Trusted_Connection=yes;" +
"Database=Database;" +
"connection timeout=30");
SqlDataAdapter daEmployees
= new SqlDataAdapter("Select *, Lname +', '+ Fname as LastFirst, Fname +' '+ Lname as FirstLast FROM Employees WHERE Lname IS NOT NULL AND Fname IS NOT NULL", myConnection);
DataSet dsEmployees = new DataSet("Employees");
daEmployees.FillSchema(dsEmployees, SchemaType.Source, "Employees");
daEmployees.Fill(dsEmployees, "Employees");
DataTable tblEmployees;
tblEmployees = dsEmployees.Tables["Employees"];
comboBox1.DisplayMember = "FirstLast";
comboBox1.ValueMember = "employeeNumber";
comboBox1.DataSource = tblEmployees;
try
{ }
catch (Exception e)
{
MessageBox.Show(e.ToString());
}
finally
{
if (myConnection != null)
{
myConnection.Dispose();
}
}
comboBox1.SelectedIndexChanged += comboBox1_SelectedIndexChanged;
comboBox2.SelectedIndexChanged += comboBox2_SelectedIndexChanged;
}
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBox1.SelectedIndex != -1)
{
textBox1.Text = string.Empty;
}
{
textBox12.Text = comboBox1.SelectedValue.ToString();
}
}
private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBox2.SelectedIndex == -1)
{
textBox1.Text = string.Empty;
}
else
{
textBox1.Text = comboBox2.SelectedItem.ToString();
}
}
private void Employees_Load(object sender, EventArgs e)
{
}
private void label1_Click(object sender, EventArgs e)
{
}
private void textBox1_TextChanged_1(object sender, EventArgs e)
{
//Last Name
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
//First Name
}
private void textBox3_TextChanged(object sender, EventArgs e)
{
//Middle Name
}
private void textBox4_TextChanged(object sender, EventArgs e)
{
//Hire Date
}
private void textBox5_TextChanged(object sender, EventArgs e)
{
//Term Date
}
private void textBox6_TextChanged(object sender, EventArgs e)
{
//Company
}
private void textBox7_TextChanged(object sender, EventArgs e)
{
//Notes
}
private void textBox8_TextChanged(object sender, EventArgs e)
{
//PTO
}
private void textBox9_TextChanged(object sender, EventArgs e)
{
//SNP
}
private void textBox10_TextChanged(object sender, EventArgs e)
{
//Credentials
}
private void textBox11_TextChanged(object sender, EventArgs e)
{
//Employee Full Name (First Last)
}
private void textBox12_TextChanged(object sender, EventArgs e)
{
//Employee ID
}
private void textBox13_TextChanged(object sender, EventArgs e)
{
//Branch
}
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked)
{
// logic here for if the box has now been checked
}
else
{
// what to do if the box has been unchecked
}
}
private void button1_Click(object sender, EventArgs e)
{
Main myNewForm = new Main();
myNewForm.Show();
this.Close();
}
private void button2_Click(object sender, EventArgs e)
{
Reports myNewForm = new Reports();
myNewForm.Show();
this.Close();
}
}
}
【问题讨论】：
-
你能把代码粘贴到这里吗？
-
对不起，我以为我已经从命名空间中选择了所有内容。抱歉。
-
向我们展示更多代码，尤其是调用和抛出错误的上下文
-
@ChrisTurner - 我仍然没有看到你说错误所在的代码。
-
@Preet Sangha - 第 18 行第 30 列出现错误；但是，在这里它位于代码顶部附近的公共类 myData 中