In the code bdehind && syntax does not work, any ideas?
Entities ctx3 = new Entities();
var uniqueQuote = from quot in ctx3.Quotes.Include("aspnet_Users").Include("Enquiries")
where quot.Enquiries.EnquiryId == selectedEnquiryId &&
quot.aspnet_Users.UserId == currentUserId
orderby quot.QuotePrice
select quot;
Error 2 Delegate 'System.Func' does not take '1' arguments C:\LocalGarageFinder\LocalGarageFinder\EnquiryDetail.aspx.cs 56 33 LocalGarageFinder
The code as written is fine. If you are receiving some sort of error, please let us know.
If EnquiryId or UserId is a Nullable type you will get the error. Use EnquiryId.Value == selectedEnquiryId or UserId.Value == currentUserId
Related
var query = from c in context.Albums
where c.AlbumID in albumIds
select c.Albumname;
Here albumIds is IENUM<> of some custom type(in my case its an Entity)
When I do the above query I get an error
Operator == cannot be applied to type int and IEnumerable
This error is acceptable but how do I overcome this
Turn it around slightly - you want to check whether your enumerable of album ids contains the id of an album you have just iterated to in your linq. So something like this ...
albumIds = {1,2,13,25,277,567};
var query = context.Albums.Where(x=> albumIds.Contains(x.ID));
(Sorry, writing example code without a tool in front of me so forgive any obvious mistakes. Hopefully you can get the idea from this though).
var albumIds= new string[] { "900", "801", "802", "803","906" };
var lstData = context.tbl.Where(
x => (x.TimeCreated >= yesterday && x.TimeCreated < today) &&
albumIds.Contains(x.TransactionSetId)
).Select(x => x.X12_Interchange).ToList();
How to validate whether the text in multiple textboxes are unique from each other.
It looks like that in asp.net but its not a valid syntax
bool hasNoDuplicate = (txtEmergencyName1.Text.Trim() <> txtEmergencyName2.Text.Trim() <> txtEmergencyName3.Text.Trim <> txtEmergencyName4.Text.Trim);
I am looking for an efficient appraoch, kind of lambda expression or inbuilt in asp.net
Since you're asking for lambda, here's a linq approach.
var allTxt = new[] { txtEmergencyName1, txtEmergencyName2, txtEmergencyName3, txtEmergencyName4 };
var allText = allTxt.Select((txt, i) => new { Text = txt.Text.Trim(), Pos = i + 1 }).ToList();
bool hasNoDuplicate = !allText.Any(t => allText.Skip(t.Pos).Any(t2 => t.Text == t2.Text));
Put all relevant TextBoxes in a collection like an array and use Enumerable.Any. By skipping all before the current textbox you avoid checking the TextBoxes twice.
If all relevant TextBoxes are in a container control like a Panel, you could also use Enumerable.OfType to find them:
IEnumerable<TextBox> allTxt = this.EmergencyPanel.Controls.OfType<TextBox>();
Side-note: it's premature optimization anyway to look for the most performant way to validate some controls. This is nothing what you are doing constantly and there are never millions of controls. Instead you should look for the shortest or most readable approach.
You can use and && or or || operator accordingly
bool isDuplicate=(txtEmergencyName1.Text.Trim() == txtEmergencyName2.Text.Trim()
&& txtEmergencyName2.Text.Trim() == txtEmergencyName3.Text.Trim);
it will set true or false in the isDuplicate variable.
Edit 1
bool isDuplicate=(txtEmergencyName1.Text.Trim() == txtEmergencyName2.Text.Trim()
&& txtEmergencyName2.Text.Trim() == txtEmergencyName3.Text.Trim
&& txtEmergencyName1.Text.Trim() == txtEmergencyName3.Text.Trim
);
You could also do something like
var test = new TextBox();
var AlltBox = new List<TextBox>() { new TextBox() };
for(int i=1; i == 5;i++)
AlltBox.Add((TextBox)this.FindName("txtEmergencyName"+i));
bool exist = AlltBox.Any(tb => ((tb.Text == test.Text)&& tb.Name != test.Name));
but i don't know about the performance
Item_SubContractor Item = (
from Isc in db.Item_SubContractors
where Isc.SubContract_id == tempSubContractId
&& Isc.Item_id == BOQItem.id
select Isc).ToList().FirstOrDefault();
Item is returning NULL, when db.Item_SubContractors, tempSubContractId, BOQItem.id all return something when I break point and run through it
Someone has any ideas how can I solve this problem?
Thanks
the FirstOrDefault() will return NULL if you don't have the value in your Database then be sure that the same item exist in your database
you can test this
bool exist = db.Item_SubContractors.Any(
Isc=> Isc.SubContract_id == tempSubContractId
&& Isc.Item_id == BOQItem.id)
to check if you have this item in your database
I have, what I thought was a pretty straight-forward query.
In normal Sql this would read:
SELECT [column names]
FROM agentscheduledetail
WHERE (date = '2012-07-04') AND
(
exception = 'Break (No Sign Off)' OR
exception = 'Break' OR
exception = 'Break (Signed Out)'
)
This returns approx 900 records.
However, when I try to enter this into my controller, I end up with around 300,000 records - so I think my AND and ORs are not working. I've tried Linqer, but can't get it to work (I'm aware this may not be actual LINQ but the equivalent query in VS - if there is a linq version... I'd be grateful for that too if possible).
My controller query is:
var dte = DateTime.Today;
return View(db.agentscheduledetails.Where
(
d => d.date == dte && d.agentName.StartsWith("ta") &&
(
d.exception == "Break (No Sign Off)" ||
d.exception == "Break" ||
d.exception == "Break (Signed Out)"
)
).ToList()
);
Can anyone either a) let me know where I'm going wrong with my && || (and/or), or b) is there a way of stepping through the code in VS, to see what the above query translates to in normal SQL so I can try to figure out where I'm going wrong?
Thanks for any help,
Mark
The following is perhaps a simplified version of what you are trying to do, also your LINQ contains an additional statement compared to the SQL where it is comparing the agent name?
var currentDate = DateTime.Today;
var exceptionTypes = new List<string>() { "Break (No Sign Off)",
"Break", "Break (Signed Out)" };
db.agentscheduledetails.Where(d => d.date == currentDate &&
exceptionTypes.Contains(d.exception));
One thing that you could try is getting hold of a copy of LinqPad, this will let you run your LINQ statement against a database and will show you what the generated SQL statement is.
Aside from anything else,
d.agentName.StartsWith("ta")
does not appear in your original sql...?
I have a LINQ query like this:
from i in _db.Items.OfType<Medium>()
from m in i.Modules
from p in m.Pages
where i != null && i.Type == 1 && i.Published == true && p.PageId == 2
select p
I use the query like this because I have strongly typed view (ASP.NET MVC).
I need to have items sorted by the i.Sort property. orderby i.Sort and i.OrderBy(it => it.Sort) doesn't work. How can I fix this?
When sorting with Linq you usually give OrderBy a property, and eventually an IComparer, not a sorting function. For example:
class Person {
public int Age {get; set;}
}
public static void Main() {
var ps = new List<Person>();
ps.Add(new Person{Age = 1});
ps.Add(new Person{Age = 5});
ps.Add(new Person{Age = 3});
var sorted = ps.OrderBy(p => p.Age);
foreach(p in sorted) {
Console.WriteLine(p.Age);
}
}
Here Linq will know how to correctly sort integers.
Without giving more context (such as what exactly is i.Sort, what is its purpose, what do you want to do with it), it would be difficult to be more specific to your problem.
However, I'm pretty sure you are misunderstanding OrderBy: you should give it a lambda expression that identifies a property of the objects contained in your sequence, and then Linq will sort your sequence according to the usual order of the type of that property (or according to another order you define for that type, by using IComparer).
Let's say your Pages include page-numbers among their properties. Let's pretend this property is called "pagenumber". You would then add the following 'orderby' line between the 'where' and 'select' lines.
// (snip...)
where i != null && i.Type == 1 && i.Published == true && p.PageId == 2
orderby p.pagenumber
select p
Or maybe you don't have page numbers, but only page titles. You would do nearly the same thing:
where i != null && i.Type == 1 && i.Published == true && p.PageId == 2
orderby p.title
select p
Just from reading your code, I can't tell what criteria should be used for sorting. You need some kind of ordered element, an id number, a page number, or some text can be alphabetized.
from i in _db.Items.OfType<Medium>().OrderBy(x => x.Sort)
...