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var Reslute = from TableUser in sc.getDataTable(strSql).AsEnumerable()
where TableUser["UserName"].ToString() == txtUserName.Text && TableUser["Password"].ToString() == txtPassword.Text
select TableUser;
var UserName = Result.select(a => a.username)
var Reslute = from TableUser in sc.getDataTable(strSql).AsEnumerable() where TableUser["UserName"].ToString() == txtUserName.Text && TableUser["Password"].ToString() == txtPassword.Text select new
{
userName = TableUser["UserName"].ToString(),
password = TableUser["Password"].ToString(),
permission = TableUser["Permission"].ToString()
}
var Reslute = (from TableUser in sc.getDataTable(strSql).AsEnumerable()
where TableUser.Field<string>("UserName") == txtUserName.Text && TableUser.Field<string>("Password") == txtPassword.Text
select TableUser).SingleOrDefault();
if(Reslute !=null)
{
string userName=Reslute.Field<string>("UserName");
//其他的就这么写就OK了
}