当我尝试编译我的C#程序时,我收到以下错误:
类型或命名空间名称“登录”无法找到(您是否缺少using指令或程序集引用?)
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace FootballLeague
{
public partial class MainMenu : Form
{
FootballLeagueDatabase footballLeagueDatabase;
Game game;
Team team;
Login login; //Error here
public MainMenu()
{
InitializeComponent();
changePanel(1);
}
public MainMenu(FootballLeagueDatabase footballLeagueDatabaseIn)
{
InitializeComponent();
footballLeagueDatabase = footballLeagueDatabaseIn;
}
private void Form_Loaded(object sender, EventArgs e)
{
}
private void gameButton_Click(object sender, EventArgs e)
{
int option = 0;
changePanel(option);
}
private void scoreboardButton_Click(object sender, EventArgs e)
{
int option = 1;
changePanel(option);
}
private void changePanel(int optionIn)
{
gamePanel.Hide();
scoreboardPanel.Hide();
string title = "Football League System";
switch (optionIn)
{
case 0:
gamePanel.Show();
this.Text = title + " - Game Menu";
break;
case 1:
scoreboardPanel.Show();
this.Text = title + " - Display Menu";
break;
}
}
private void logoutButton_Click(object sender, EventArgs e)
{
login = new Login();
login.Show();
this.Hide();
}
Login.cs类:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace FootballLeagueSystem
{
public partial class Login : Form
{
MainMenu menu;
public Login()
{
InitializeComponent();
}
private void administratorLoginButton_Click(object sender, EventArgs e)
{
string username1 = "08247739";
string password1 = "08247739";
if ((userNameTxt.Text.Length) == 0)
MessageBox.Show("Please enter your username!");
else if ((passwordTxt.Text.Length) == 0)
MessageBox.Show("Please enter your password!");
else if (userNameTxt.Text.Equals("") || passwordTxt.Text.Equals(""))
MessageBox.Show("Invalid Username or Password!");
else
{
if (this.userNameTxt.Text == username1 && this.passwordTxt.Text == password1)
MessageBox.Show("Welcome Administrator!", "Administrator Login");
menu = new MainMenu();
menu.Show();
this.Hide();
}
}
private void managerLoginButton_Click(object sender, EventArgs e)
{
{
string username2 = "1111";
string password2 = "1111";
if ((userNameTxt.Text.Length) == 0)
MessageBox.Show("Please enter your username!");
else if ((passwordTxt.Text.Length) == 0)
MessageBox.Show("Please enter your password!");
else if (userNameTxt.Text.Equals("") && passwordTxt.Text.Equals(""))
MessageBox.Show("Invalid Username or Password!");
else
{
if (this.userNameTxt.Text == username2 && this.passwordTxt.Text == password2)
MessageBox.Show("Welcome Manager!", "Manager Login");
menu = new MainMenu();
menu.Show();
this.Hide();
}
}
}
private void cancelButton_Click(object sender, EventArgs e)
{
this.Close();
}
}
}
错误在哪里?我究竟做错了什么?
最佳答案
您没有登录类的命名空间作为参考。
将以下内容添加到使用Login类的表单中:
using FootballLeagueSystem;
当你想在另一个namespace中使用一个类时,你必须告诉编译器找到它。在这种情况下,Login位于FootballLeagueSystem命名空间内,或:FootballLeagueSystem.Login是完全限定的命名空间。
正如评论者指出的那样,您在FootballLeagueSystem命名空间中声明Login类,但是您在FootballLeague命名空间中使用它。
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