最近，看到网上经常会问如何进行窗口跳转，大多数的问题都是牵扯到Login窗口。其实，在Visual Studio 6以来，比较正确的做法，是判断Login窗口的返回值，然后决定是否打开主窗体，那么在C#中也是一样的。 具体做法如下： 首先，创建Login窗口，然后添加相应的输入框和按钮，设置窗口的AcceptButton为窗体的确认按钮，而CancelButton为窗体的取消按钮。例如： this.AcceptButton = this.btnOK; this.CancelButton = this.btnCancel; private void btnOK_Click(object sender, System.EventArgs e) // Here is to use fixed username and password // You can check username and password from DB if( txtUserName.Text == "Admin" && txtPassword.Text == "nopassword" ) uiLogin.UserName = txtUserName.Text; uiLogin.Password = txtPassword.Text; // Set dialog result with OK this.DialogResult = DialogResult.OK; // Wrong username or password if( nLoginCount == MAX_LOGIN_COUNT ) this.DialogResult = DialogResult.Cancel; MessageBox.Show( "Invalid user name and password!" ); private void btnCancel_Click(object sender, System.EventArgs e) // Set dialog result with Cancel this.DialogResult = DialogResult.Cancel; private void frmLogin_Closing(object sender, System.ComponentModel.CancelEventArgs e) // Check whether form is closed with dialog result if( this.DialogResult != DialogResult.Cancel && this.DialogResult != DialogResult.OK ) private int nLoginCount = 0; private const int MAX_LOGIN_COUNT = 3; private UserInfo uiLogin; public frmLogin( ref UserInfo ui ) // Required for Windows Form Designer support // Set login info to class member /// The main entry point for the application. UserInfo ui = new UserInfo(); frmLogin myLogin = new frmLogin( ref ui ); if( myLogin.ShowDialog() == DialogResult.OK ) //Open your main form here MessageBox.Show( "Logged in successfully!" ); MessageBox.Show( "Failed to logged in!" ); private string strUserName; private string strPassword; get{ return strUserName;} set{ strUserName = value; } get{ return strPassword;} set{ strPassword = value;} | 
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