C# winform 主界面打开并关闭登录界面

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在winform 界面编程中，我们有时候要在主界面打开之前先显示登录界面，当登录界面用户信息校验正确后才打开主界面，而这时登陆界面也完成使命该功成身退了。

目前有两种方法可实现：

方法1. 隐藏登录界面

Program.cs 中代码如下：

/// <summary>
/// login
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnLogin_Click(object sender, EventArgs e)
{
if (txtPassword.Text == "")
{
UI ui = new UI();
this.Visible = false;
ui.ShowDialog();//此处不可用Show()
this.Dispose();
this.Close();
}
else
{
MessageBox.Show("Password is incorrect ", "Prompt message",MessageBoxButtons.OK,MessageBoxIcon.Error);
}
} /// <summary>
/// exit
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnExit_Click(object sender, EventArgs e)
{
this.Dispose();
this.Close();
}

方法2. 登录界面以 dialog形式打开，返回登录结果

Program.cs 中代码如下：

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Login login = new Login();
login.ShowDialog();
if (login.DialogResult == DialogResult.OK)
{
login.Dispose();
Application.Run(new UI());
}
else if (login.DialogResult == DialogResult.Cancel)
{
login.Dispose();
return;
}
}

/// <summary>
/// login
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnLogin_Click(object sender, EventArgs e)
{
if (txtPassword.Text == "")
{
this.DialogResult = DialogResult.OK;
this.Dispose();
this.Close();
}
else
{
MessageBox.Show("Password is incorrect ", "Prompt message",MessageBoxButtons.OK,MessageBoxIcon.Error);
}
} /// <summary>
/// exit
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnExit_Click(object sender, EventArgs e)
{
this.DialogResult = DialogResult.Cancel;
this.Dispose();
this.Close();
}