I m just starting with microsoft (MVC,C#, LINQ), so far so good, but i have a question about LINQ uses, How do i get the value form a LINQ like this one?
var x = from a in db.tablex
where a.eventID == eventID
select new
{
owner = a.owner,
shipper = a.shipper,
consignee = a.consignee
};
I try something like "r.owner" inside a foreach to get the value retrieved from DB
foreach (var r in x)
but its not working.. i dont get intellisense either.. how do i get the value??. I saw several examples and it seems to work like this, but for some reason its not working.. Thanks
Ok guys here was the thing, (it wasnt the typo it was just in the post), i was missing a using :
using System.Reflection;
with this C# automatically creates a class from them, and now it works
What a noob of me =).
foreach (var r in x)
{
var owner = r.owner;// not x.owner
}
Related
I have a rather strange problem which is scratching my head at the moment. I am using EF together with MySQL for a project and when I want to update a record on the database like this
using (var context = new MyDbContext())
{
var record = (from d in context.Dictionary where d.CompanyName == companyName && d.Name == "Logo" select d).FirstOrDefault();
record.Value = _path;
context.SaveChanges();
}
Then every record that has d.Name == "Logo" gets updated for some reason, which means that it ignores the d.CompanyName == companyName part. Anyone who has experienced the same problem or know how to solve it?
Thanks in advance.
Actually I don't use EF Provider for MySQL often but I suppose it works.
The problem can be splitted in 2 parts, a select and an update. The select is fine, if you need to see what is the query you can split the select statement like this
var query = (from d in context.Dictionary where d.CompanyName == companyName && d.Name == "Logo" select d);
var record = query.FirstOrDefault();
and have a look to query variable (just point it in debug mode).
About your issue the only reason that I can immagine is that you did not configure the Dictionary class in the right way.
I mean, when you run context.SaveChanges an Update query is generated using the Key definition of Dictionary (the Where part of the query). If the key definition is wrong, the where clause will be wrong.
Use this I hope this will help you.
using (var context = new MyDbContext())
{
var record = context.Dictionary.Where(x=> x.CompanyName == companyName && x.Name == "Logo").FirstOrDefault();
record.Value = _path;
context.SaveChanges();
}
I'm trying to change the CreateDateTime for a node/document, but it doesn't appear to be having any effect. This is what I'm trying to far:
dynamic node = new DynamicNode(1065);
Document n = new Document(node.Id);
n.CreateDateTime = node.articlePublishedDate;
n.Save();
n.Publish(new umbraco.BusinessLogic.User(0));
umbraco.library.UpdateDocumentCache(n.Id);
Am I going about this in the right way? And also, am I correct in assuming that it can even be changed? The API seems to suggest the CreateDateTime has get/set, so it should work? Running the code through with breakpoints, it updates the CreateDateTime, but something with the save/publish seems to revert it back?
Your code is deprecated, so you need to use the "new" ContentService in umbraco:
https://our.umbraco.org/documentation/Reference/Management-v6/Services/ContentService
It should be something like this:
var cs = Services.ContentService;
var node = cs.GetById(1065);
node.CreateDate = DateTime.Now;
cs.SaveAndPublish(node);
I'm reading XML and attaching values to objects in two seperate movieclips. Like this
Map01:
Marker01.name = hello there
Marker01.short = hel
Marker01.value = 12
Map02:
Marker02.name = hello there
Marker02.short = hel
Marker02.value = 99
Now I'm clicking on Marker01 in Map01 and get its name and value. I want to compare its value to that of Marker01 in Map02, using the name, or better yet .short because the names are long and use special characters/spaces. How do I do this? I've pretty much tried everything that seemed logical!
EDIT: sample code for clarification
var marker01:mc_marker = new mc_marker();
marker01.name="hello there";
marker01.short="abc";
marker01.val="99";
marker01.x=10;
marker01.y=10;
this.mc_map01.addChild(marker01);
var marker02:mc_marker = new mc_marker();
marker02.name="hello there";
marker02.short="abc";
marker02.val="20";
marker02.x=10;
marker02.y=10;
this.mc_map02.addChild(marker02);
marker01.addEventListener(MouseEvent.MOUSE_UP, showMarkerInfo);
marker02.addEventListener(MouseEvent.MOUSE_UP, showMarkerInfo);
function showMarkerInfo(event:MouseEvent):void {
txt_ms.text=event.target.short;
txt_mv.text=event.target.val;
if (event.target.short==mc_map02.marker02.short){
txt_mvi.text="here should be the marker02 value";
}
}
You have a typo there. Map02 use Marker1 things.
If its a typo in Stackoverflow,
this.getChildByName( "Marker01" ) will return you the movieclip, buy its name. take care though, as "name" is what it searches for. You used "hello there" when you should put Marker01 as the name. I would suggest you put a property called "data" and put the xml info in it so it doesn't conflict.
In the end you have:
if( this.getChildByName( "Marker01" ).data.value == this.getChildByName( "Marker02" ).data.value ).
I assume this is because you generate Marker0X at runtime and you can't declare some variables and use them directly.
Browny points if you make "data" a instance of a custom class where you can compare two "data". If you need more help, add a comment ^_^
Trying to display a set of images from uComponents' MNTP, and can't get a value for the umbracoFile property - in the example below, both umbracoFile and url return empty strings:
foreach (var id in #Model.sliders) {
var media = Model.MediaById(id.InnerText);
if (media != null){
var url = media.umbracoFile;
<p>name = #media.Name</p>
<p>alt = #media.altText</p>
<p>url = #media.umbracoFile</p>
<p>url = #url</p>
}
}
It's getting really really really annoying... I've worked around it in other areas like so, using Model.Media:
<img src="#Model.Media("topRightImage", "umbracoFile")" alt="#Model.Media("topightImage", "altText")" />
But that will only help if with the media picker data type, not mntp. It shouldnt' be that difficult, should it?
I can get the images to load if I rebuild the internal search index, but they're gone again on subsequent refreshes.
I've seen others having similar problems, and would really appreciate a solution...
ta
Nathan
This looks like a bug that was fixed in 4.7.2. See the following codeplex item:
http://umbraco.codeplex.com/workitem/30778
i'm not sure this is the best way to do the following code. I'm not sold on a foreach inside another foreach. Could this be done *better** with Linq?
*I understand that better could be either
a) more performant
b) easier to read / more elegant
c) all of the above
NOTE: .NET 3.5 solutions accepted :)
NOTE2: the two IList's were the results of a multi-recordset stored procedure, via Linq2Sql.
here's the make believe code:
// These two lists are the results from a IMultipleResults Linq2Sql stored procedure.
IList<Car> carList = results.GetResult<Car>().ToList();
IList<Person> people = results.GetResult<Person>().ToList();
// Associate which people own which cars.
foreach(var person in people)
{
var cars = (from c in cars
where c.CarId == person.CarId
select c).ToList();
foreach (var car in cars)
{
car.Person = person;
}
}
Cheers :)
I don't think performance would be any different but if you're looking for terseness:
var q = from person in people
join car in cars on person.CarId equals car.CarId
select new { car, person };
foreach(var o in q)
{
o.car.Person = o.person;
}
Edit: After Jon's hint on this version being faster I got curious and profiled both functions. This version seems twice as fast which is amazing. I checked the disassembly. The overhead of the original implementation seems to come from new enumerators getting created for both outer and inner loop, causing P times new/dispose overhead.
For this code only one Enumerator is created which I think is the magic of "Join" function. I didn't examine how it works though.