C# 登录界面代码_Login

WCFC大雨餐饮管理系统经典版.BLL系统维护.frm_XiTongWeiHu.frm_XiTongWeiHuClient myfrm_XiTongWeiHuClient = new BLL系统维护.frm_XiTongWeiHu.frm_XiTongWeiHuClient();
private void btn_DengLu_Click(object sender, EventArgs e)
{
#region 查询登录信息是否正确
StaticPublicObject.StaticPublicObject.dtQuanXian = new DataTable();
StaticPublicObject.StaticPublicObject.UserName = txt_DengLuMingCheng.Text.Trim();
StaticPublicObject.StaticPublicObject.PassWord = txt_DengLuMiMa.Text.Trim();
//根据"登录名称"和"登录密码"判断某个用户是否存在
DataTable dtYongHu = myfrm_XiTongWeiHuClient.btn_DengLu_Click_SelectYuanGong(StaticPublicObject.StaticPublicObject.UserName, StaticPublicObject.StaticPublicObject.PassWord).Tables[0];
//根据"登录名称"判断用户是否存在
DataTable dtDengLuMingCheng = myfrm_XiTongWeiHuClient.btn_DengLu_Click_SelectYuanGongDengLuMingCheng(StaticPublicObject.StaticPublicObject.UserName).Tables[0];
//if ((int)dtYongHu.Rows[0][0] > 0)
if (StaticPublicObject.StaticPublicObject.UserName == "")//若"登录名称"为空
{
MessageBox.Show("[登录名称]还没有填写呢！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
if (dtDengLuMingCheng.Rows.Count > 0)//根据"登录名称"判断用户是否存在,若存在用户
{
if (dtYongHu.Rows.Count > 0)//根据"登录名称"和"登录密码"判断某个用户是否存在,若存在用户
{
if (StaticPublicObject.StaticPublicObject.UserName.Equals(dtYongHu.Rows[0][2].ToString()))
{
this.Hide();
frm_Main myfrm_Main = new frm_Main();
myfrm_Main.Show();
#region 查询权限
try
{
StaticPublicObject.StaticPublicObject.strUserName = dtYongHu.Rows[0][1].ToString().Trim();
StaticPublicObject.StaticPublicObject.UserID = Convert.ToInt32(dtYongHu.Rows[0][0]);
StaticPublicObject.StaticPublicObject.dtQuanXian = myfrm_XiTongWeiHuClient.btn_DengLu_Click_SelectQuanXian(StaticPublicObject.StaticPublicObject.UserID).Tables[0];
}
catch { }
#endregion
}
else
{
MessageBox.Show("[登录名称]不存在,请重新填写！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
else
{
MessageBox.Show("[登录密码]不正确,请重新填写！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
}
else
{
MessageBox.Show("[登录名称]不存在,请重新填写！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
#endregion
}