当我尝试编译我的 C# 程序时出现以下错误:
找不到类型或命名空间名称“Login”(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();
}
}
}
错在哪里?我做错了什么?
最佳答案
当我的项目 .net 框架版本与我链接到的 DLL 的框架版本不匹配时,我收到此错误。就我而言,我得到了:
“找不到类型或命名空间名称‘UserVoice’(是否缺少 using 指令或程序集引用?)。
UserVoice 是 .Net 4.0,我的项目属性设置为“.Net 4.0 Client Profile”。在项目上更改为 .Net 4.0 清除了错误。我希望这对某人有所帮助。
关于c# - 找不到类型或命名空间(是否缺少 using 指令或程序集引用?),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2721351/