4，2011.9.1用户登录，更换，密码更改

main_form中3个按钮，

登录，更换用户，密码更改

登录按钮 与后2个按钮不同时有效

//用户登录
private void login_barButtonItem_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
login_Form my_loging_form = new login_Form();

my_loging_form.Text = "用户登录";

if (my_loging_form.ShowDialog() == DialogResult.OK)
{
this.login_barButtonItem.Enabled = false;

this.userchange_barButtonItem.Enabled = true;
this.passwordChange_barButtonItem .Enabled = true;
//获取userName
this.my_userName = my_loging_form.userName;
this.my_userLevel = my_loging_form.userLevel;
this.Text = this.Text + "---" + this.my_userName;

my_checkLevel();
}

my_loging_form.Dispose();
}

//密码更改
private void passwordChange_barButtonItem_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
login_Form my_passwordChange_form = new login_Form();
my_passwordChange_form.Text = "密码更改";

my_passwordChange_form.userName  = this.my_userName.Trim();

my_passwordChange_form.ShowDialog();
my_passwordChange_form.Dispose();
}

//切换用户
private void userchange_barButtonItem_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
{
//关闭所有子窗口
foreach (Form child_form in this.MdiChildren)
{
child_form.Close();
}

//没有子窗口后，打开用户更换窗口

if (this.ActiveMdiChild == null)
{
login_Form my_userChange_form = new login_Form();
my_userChange_form.Text = "更换用户";
my_userChange_form.userName = this.my_userName.Trim();
if (my_userChange_form.ShowDialog() == DialogResult.OK)
{
this.my_userName = my_userChange_form.userName;
this.my_userLevel = my_userChange_form.userLevel;

if (this.Text.IndexOf("---") != -1)
{
this.Text = this.Text.Remove(this.Text.IndexOf("---"));
}
this.Text = this.Text + "---" + this.my_userName;
my_checkLevel();

}
my_userChange_form.Dispose();
}

}

//按用户类型，给操作权限（使功能按钮可用）
private void my_checkLevel()
{
// throw new Exception("The method or operation is not implemented.");
this.buyList_barButtonItem.Enabled = my_userLevel[0] == '1';
this.LookList_barButtonItem.Enabled = my_userLevel[0] == '1';
this.inWareCheck_barButtonItem.Enabled = my_userLevel[1] == '1';
this.outWareCheck_barButtonItem.Enabled = my_userLevel[1] == '1';

}

使用的是一个LOGIN_form

根据不同要求，有区别

private void login_Form_Load(object sender, EventArgs e)
{
this.userName_textEdit.Text = my_userName;

if (this.Text.Trim() == "密码更改")
{
this.userName_textEdit.Enabled = false;

this.ok_simpleButton.Visible = false;
this.change_simpleButton.Visible = true;

this.password_textEdit.Focus();

}
else
{
this.userName_textEdit.SelectAll();
this.userName_textEdit.Focus();
if (this.Text.Trim() == "更换用户")
{
this.ok_simpleButton.ImageIndex = 2;
this.ok_simpleButton.Text = "更换";
}
}
}

定义2个与父窗口交换数据的变量

private string my_userName;
private string my_userLevel;

public string userName
{
get
{
return my_userName;
}
set
{
my_userName = value;
}
}

public string userLevel
{
get
{
return my_userLevel;
}
}

dataset使用VS生成


更改密码，只有一个长度的甄别

//修改密码
private void change_simpleButton_Click(object sender, EventArgs e)
{
if (this.password_textEdit.Text.Trim().Length < 6)
{
MessageBox.Show("密码长度不得低于6字符", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
this.password_textEdit.SelectAll();
this.password_textEdit.Focus();
}
else
{
try
{
this.userListTableAdapter.Fill(this.sY_Store_DataSet.UserList);
DataRow my_user_datarow = this.sY_Store_DataSet.UserList.Rows.Find(this.my_userName .Trim());
if (my_user_datarow == null)
{
MessageBox.Show(this.my_userName + "  已被删除");
this.DialogResult = DialogResult.Cancel;
}
else
{
my_user_datarow.BeginEdit();
my_user_datarow["userpassword"] = this.password_textEdit.Text.Trim().ToLower();
my_user_datarow.EndEdit();
this.userListTableAdapter.Update(this.sY_Store_DataSet.UserList);
this.DialogResult = DialogResult.OK;
}
}
catch (System.Exception err)
{
MessageBox.Show(err.Message);
}
}

登录用户与更换用户是相同的

private void ok_simpleButton_Click(object sender, EventArgs e)
{
this.errorProvider.Clear();
try
{
this.userListTableAdapter.Fill(this.sY_Store_DataSet.UserList);
DataRow my_user_datarow = this.sY_Store_DataSet.UserList.Rows.Find(this.userName_textEdit.Text.Trim());
if (my_user_datarow == null)
{
this.error_pictureBox.Visible = true;
this .Enabled =false ;
this.userErr_timer.Start();//开始计时
this.userErr_timer.Interval = 2000;//计时2秒
}
else if(Convert .ToString (my_user_datarow ["userpassword"])!=this .password_textEdit .Text .Trim ().ToLower ())
{
this.error_pictureBox.Visible = true;
this.Enabled = false;
this.PassErr_timer.Start();
this.PassErr_timer.Interval = 2000;
}
else
{
this.ok_pictureBox.Visible = true;
this.my_userName = this.userName_textEdit.Text.Trim();
this.my_userLevel =Convert .ToString ( my_user_datarow["userlevel"]).Trim ();
this.Enabled = false;
this.ok_timer.Start();
this.ok_timer.Interval = 2000;
}
}
catch (System.Exception  err)
{
MessageBox .Show ( err.Message ) ;
}
}

设定了3个定时器，3个情况（用户名错，密码错，正确）

显示不同表情，不同的timer_tick事件

private void ok_timer_Tick(object sender, EventArgs e)
{
this.ok_timer.Stop();
this.DialogResult = DialogResult.OK;
}

private void userErr_timer_Tick(object sender, EventArgs e)
{
this.error_pictureBox.Visible = false;
this.Enabled = true;
this.errorProvider.SetError(this.userName_textEdit, "此用户不存在");
this.userName_textEdit.SelectAll();
this.userName_textEdit.Focus();
this.userErr_timer.Stop();
}

private void PassErr_timer_Tick(object sender, EventArgs e)
{
this.error_pictureBox.Visible = false;
this.Enabled = true;
this.errorProvider.SetError(this.password_textEdit , "密码错误");
this.password_textEdit.SelectAll();
this.password_textEdit.Focus();
this.PassErr_timer.Stop();
}