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用戶登錄類：

public partial class UserLogin : DevComponents.DotNetBar.Office2007RibbonForm
{
private SceneViewer sceneViewer = new SceneViewer();
private UserManage userManage = new UserManage();

public UserLogin()
{
InitializeComponent();
}

private void btnCancel_Click(object sender, EventArgs e)
{
this.Close();
//MessageBox.Show("請輸入正確的用戶名和密碼！", "登陸失敗！", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}

private void btnLogin_Click(object sender, EventArgs e)
{

if (this.editUserName.Text == string.Empty)
{
MessageBox.Show("用戶名不能為空！");
this.editUserName.Focus();
return;
}
else if(userManage.UserDictionary.ContainsKey(this.editUserName.Text))
{
string psd = userManage.UserDictionary[this.editUserName.Text];
if (this.editPassword.Text == psd)
{
MessageBox.Show("歡迎登錄本系統！", "登陸成功！", MessageBoxButtons.OK, MessageBoxIcon.Information);
this.DialogResult = DialogResult.OK;
}
else
{
MessageBox.Show("密碼錯誤，請重新輸入！", "密碼錯誤！", MessageBoxButtons.OK, MessageBoxIcon.Error);
this.editPassword.Text = string.Empty;
this.editPassword.Focus();
}
}
else
{
MessageBox.Show("用戶名不存在！","登錄失敗！",MessageBoxButtons.OK,MessageBoxIcon.Warning);
this.editUserName.Text = string.Empty;
this.editPassword.Text = string.Empty;
this.editUserName.Focus();
}


}



private void btnLogin_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
this.btnLogin.Click+=new EventHandler(btnLogin_Click);
}
}

private void UserLogin_Load(object sender, EventArgs e)
{
if (this.editUserName.Text == string.Empty && this.editPassword.Text == string.Empty)
{
this.btnLogin.Enabled = false;
}
}

private void editPassword_TextChanged(object sender, EventArgs e)
{
if (this.editUserName.Text == string.Empty && this.editPassword.Text == string.Empty)
this.btnLogin.Enabled = false;
else if (this.editUserName.Text == string.Empty && this.editPassword.Text != string.Empty)
this.btnLogin.Enabled = false;

else if (this.editUserName.Text != string.Empty && this.editPassword.Text == string.Empty)
this.btnLogin.Enabled = false;
else
this.btnLogin.Enabled = true;

}


}

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主程序類：

static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);

UserLogin userLogin = new UserLogin();
try
{
if (userLogin.ShowDialog() == DialogResult.OK)
Application.Run(new SceneViewer());
else
Application.Exit();
}
finally
{
userLogin.Close();
}
}

}

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至于用戶的管理，若用戶數量很少，且內部使用可以用Dictionary<key,value>進行管理；

若用戶數很多的話，就用數據庫的方式進行管理

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轉載于:https://www.cnblogs.com/St_Dlng/archive/2010/10/14/1851067.html

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