Cordial saludo.
Estoy tratando de enlazar unas clases que manejan una base de datos en ASP.NET pero me siguen apareciendo los siguientes errores:
The name ‘titleOfCourtesy’ does not exist in the current context.
The name ‘lastName’ does not exist in the current context.
The name ‘firstName’ does not exist in the current context.
The name ‘EmployeeID’ does not exist in the current context.
Las clases las tome de un libro, pero en este no describen cómo enlazarlas para que conecten a la página aspx. Aquí los códigos de las clases:
EmployeeDB.cs
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Sql;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Web.Configuration;
using WebEmpleados2;
namespace WebEmpleados2
{
class EmployeeDB
{
private string connectionString;
public EmployeeDB()
{
// Get default connection string.
connectionString = WebConfigurationManager.ConnectionStrings["Northwind"].ConnectionString;
}
public EmployeeDB(string connectionString)
{
// Set the specified connection string.
this.connectionString = connectionString;
}
public int InsertEmployee(EmployeeDetails emp)
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("InsertEmployee", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@FirstName", SqlDbType.NVarChar, 10));
cmd.Parameters["@FirstName"].Value = emp.FirstName;
cmd.Parameters.Add(new SqlParameter("@LastName", SqlDbType.NVarChar, 20));
cmd.Parameters["@LastName"].Value = emp.LastName;
cmd.Parameters.Add(new SqlParameter("@TitleOfCourtesy",
SqlDbType.NVarChar, 25));
cmd.Parameters["@TitleOfCourtesy"].Value = emp.TitleOfCourtesy;
cmd.Parameters.Add(new SqlParameter("@EmployeeID", SqlDbType.Int, 4));
cmd.Parameters["@EmployeeID"].Direction = ParameterDirection.Output;
try
{
con.Open();
cmd.ExecuteNonQuery();
return (int)cmd.Parameters["@EmployeeID"].Value;
}
catch (SqlException err)
{
// Replace the error with something less specific.
// You could also log the error now.
throw new ApplicationException("Data error.");
}
finally
{
con.Close();
}
}
public void DeleteEmployee(int employeeID)
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("DeleteEmployee", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@EmployeeID", SqlDbType.Int, 4));
cmd.Parameters["@EmployeeID"].Value = employeeID;
try
{
con.Open();
cmd.ExecuteNonQuery();
}
catch (SqlException err)
{
throw new ApplicationException("Data error.");
}
finally
{
con.Close();
}
}
public void UpdateEmployee(EmployeeDetails emp)
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("UpdateEmployee", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@FirstName", SqlDbType.NVarChar, 10));
cmd.Parameters["@FirstName"].Value = firstName;
cmd.Parameters.Add(new SqlParameter("@LastName", SqlDbType.NVarChar, 20));
cmd.Parameters["@LastName"].Value = lastName;
cmd.Parameters.Add(new SqlParameter("@TitleOfCourtesy", SqlDbType.NVarChar,
25));
cmd.Parameters["@TitleOfCourtesy"].Value = titleOfCourtesy;
cmd.Parameters.Add(new SqlParameter("@EmployeeID", SqlDbType.Int, 4));
cmd.Parameters["@EmployeeID"].Value = EmployeeID;
try
{
con.Open();
cmd.ExecuteNonQuery();
}
catch (SqlException err)
{
throw new ApplicationException("Data error.");
}
finally
{
con.Close();
}
}
public EmployeeDetails GetEmployee(int employeeID)
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("GetEmployee", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@EmployeeID", SqlDbType.Int, 4));
cmd.Parameters["@EmployeeID"].Value = employeeID;
try
{
con.Open();
SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.SingleRow);
// Check if the query returned a record.
if (!reader.HasRows) return null;
// Get the first row.
reader.Read();
EmployeeDetails emp = new EmployeeDetails(
(int)reader["EmployeeID"], (string)reader["FirstName"],
(string)reader["LastName"], (string)reader["TitleOfCourtesy"]);
reader.Close();
return emp;
}
catch (SqlException err)
{
throw new ApplicationException("Data error.");
}
finally
{
con.Close();
}
}
public List<EmployeeDetails> GetEmployees()
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("GetAllEmployees", con);
cmd.CommandType = CommandType.StoredProcedure;
// Create a collection for all the employee records.
List<EmployeeDetails> employees = new List<EmployeeDetails>();
try
{
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
EmployeeDetails emp = new EmployeeDetails(
(int)reader["EmployeeID"], (string)reader["FirstName"],
(string)reader["LastName"], (string)reader["TitleOfCourtesy"]);
employees.Add(emp);
}
reader.Close();
return employees;
}
catch (SqlException err)
{
throw new ApplicationException("Data error.");
}
finally
{
con.Close();
}
}
public int CountEmployees()
{
SqlConnection con = new SqlConnection(connectionString);
SqlCommand cmd = new SqlCommand("CountEmployees", con);
cmd.CommandType = CommandType.StoredProcedure;
try
{
con.Open();
return (int)cmd.ExecuteScalar();
}
catch (SqlException err)
{
throw new ApplicationException("Data error.");
}
finally
{
con.Close();
}
}
}
}
EmployeeDetails.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace WebEmpleados2
{
public class EmployeeDetails
{
private int employeeID;
public int EmployeeID
{
get { return employeeID; }
set { employeeID = value; }
}
private string firstName;
public string FirstName
{
get { return firstName; }
set { firstName = value; }
}
private string lastName;
public string LastName
{
get { return lastName; }
set { lastName = value; }
}
private string titleOfCourtesy;
public string TitleOfCourtesy
{
get { return titleOfCourtesy; }
set { titleOfCourtesy = value; }
}
public EmployeeDetails(int employeeID, string firstName, string lastName,
string titleOfCourtesy)
{
EmployeeID = employeeID;
FirstName = firstName;
LastName = lastName;
TitleOfCourtesy = titleOfCourtesy;
}
}
}
Default.aspx.cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using WebEmpleados2;
using System.Text;
namespace WebEmpleados2
{
public partial class Default : System.Web.UI.Page
{
// Create the database component so it's available anywhere on the page.
private EmployeeDB db = new EmployeeDB();
protected void Page_Load(object sender, EventArgs e)
{
WriteEmployeesList();
// The ID value is simply set to 0, because it's generated by the
// database server and filled in automatically when you call
// InsertEmployee().
int empID = db.InsertEmployee(
new EmployeeDetails(0, "Mr.", "Bellinaso", "Marco"));
Label1.Text += "<br />Inserted 1 employee.<br />";
WriteEmployeesList();
db.DeleteEmployee(empID);
Label1.Text += "<br />Deleted 1 employee.<br />";
WriteEmployeesList();
}
private void WriteEmployeesList()
{
StringBuilder htmlStr = new StringBuilder("");
int numEmployees = db.CountEmployees();
htmlStr.Append("<br />Total employees: <b>");
htmlStr.Append(numEmployees.ToString());
htmlStr.Append("</b><br /><br />");
List<EmployeeDetails> employees = db.GetEmployees();
foreach (EmployeeDetails emp in employees)
{
htmlStr.Append("<li>");
htmlStr.Append(emp.EmployeeID);
htmlStr.Append(" ");
htmlStr.Append(emp.TitleOfCourtesy);
htmlStr.Append(" <b>");
htmlStr.Append(emp.FirstName);
htmlStr.Append("</b>, ");
htmlStr.Append(emp.LastName);
htmlStr.Append("</li>");
}
htmlStr.Append("<br />");
Label1.Text += htmlStr.ToString();
}
}
}
Espero me puedan ayudar. Gracias.
Tema: Enlazar clases en asp.net include The name does not exist in the current context (Leído 2718 veces)
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