I have searching for a while now, but couldn't find how to query from public view. For example, I have predefined public view called Active Accounts and I want data from it.
So far I only know this way, but that not include any views:
using (var xrm = new XrmServiceContext("Xrm"))
{
var activeAccounts = from a in xrm.AccountSet
where a.StateCode == 0
select new { a.Id, a.Name };
// TODO ...
}
But I would like to do it like this (not working, ActiveAccountsView not exist, it's pseudo):
using (var xrm = new XrmServiceContext("Xrm"))
{
var activeAccounts = from a in xrm.ActiveAccountsView
select new { a.Id, a.Name };
// TODO ...
}
Is this even possible?
The query definitions of public views are stored in the savedquery entity, that can be queried using common techniques.
Out-of-the-box views are stored with a fixed ID, so querying Active Accounts on the OrganizationServiceContext object could be done in the following way:
private static IEnumerable<Entity> GetActiveAccounts(OrganizationServiceContext serviceContext)
{
string fetchXml = serviceContext
.CreateQuery("savedquery")
.Where(sq =>
sq.GetAttributeValue<Guid>("savedqueryid") == new Guid("00000000-0000-0000-00AA-000010001002"))
.Select(sq => sq.GetAttributeValue<string>("fetchxml"))
.First();
var request = new RetrieveMultipleRequest
{
Query = new FetchExpression(fetchXml)
};
var response = (RetrieveMultipleResponse) serviceContext.Execute(request);
return response.EntityCollection.Entities;
}
It is not possible to use LINQ here. LINQ relies on the QueryExpression class, but does not implement all its capabilities (OUTER JOIN is a painful omission for example). So, while it is possible to convert a LINQ query to a QueryExpression, the other way around is not.
Paging can be applied by editing the Fetch XML string, but if that is too much hassle, you can also consider to convert the Fetch XML to a QueryExpression and apply paging on that object:
private IEnumerable<Entity> GetActiveAccounts(int pageNumber)
{
string fetchXml = _serviceContext
.CreateQuery("savedquery")
.Where(sq =>
sq.GetAttributeValue<Guid>("savedqueryid") == new Guid("00000000-0000-0000-00AA-000010001002"))
.Select(sq => sq.GetAttributeValue<string>("fetchxml"))
.First();
var conversionRequest = new FetchXmlToQueryExpressionRequest
{
FetchXml = fetchXml
};
var response = (FetchXmlToQueryExpressionResponse)_serviceContext.Execute(conversionRequest);
response.Query.PageInfo = new PagingInfo { Count = 1, PageNumber = pageNumber };
var queryRequest = new RetrieveMultipleRequest
{
Query = response.Query
};
var result = (RetrieveMultipleResponse) _serviceContext.Execute(queryRequest);
return result.EntityCollection.Entities;
}
Additional advantage of the QueryExpression vs. Fetch XML is that it is processed in a bit more efficient way.
The very same can be done with user defined views; these views are stored in the userquery entity. The only difference here is you cannot rely on a fixed view ID. Instead you would need to filter your query on querytype, name, returnedtypecode, ownerid and/or other criteria.
Dynamics CRM also has an OrganizationRequest that allows you to execute the savedquery immediately. However, it returns its result as a resultset XML string, so you would still need to deserialize the response. (A nice example can be found here.) Also, I am not sure if it is possible to limit the result set to a specific page when using the ExecuteByIdSavedQueryRequest:
var request = new ExecuteByIdSavedQueryRequest
{
EntityId = new Guid("00000000-0000-0000-00AA-000010001002")
};
var response = (ExecuteByIdSavedQueryResponse)serviceContext.Execute(request);
string resultset = response.String;
Related
I have a question for you regarding the creation of a Dynamic select query in Entity Framework.
I already have a dynamic query for the select based on rights etc. But for each table I get 30+ fields that I have to parse via the .GetType().GetProperties().
Its complex and its quite costly in terms of resource due to the amount of data we have.
I have a service that tells me which fields I should select for each table. I would like to find a way to transform that into the query but I can't find something that is really dynamic.
That is not dynamic but manual:
using (var context = new StackOverflowContext())
{
var posts = context.Posts
.Where(p => p.Tags == "<sql-server>")
.Select(p => new {p.Id, p.Title});
// Do something;
}
I need to say, select only those fields but only the fields with this names.
I have the field list in a list of string but that could be changed.
Could you please help me?
Here is a .Net Fiddle code (made by msbendtsen) that allows to dynamically select columns (properties).
https://dotnetfiddle.net/3IMR1r
The sample is written for linq to objects but it should work with entity frameworks.
The key section is:
internal static IQueryable SelectProperties<T>(this IQueryable<T> queryable, IEnumerable<string> propertyNames)
{
// get propertyinfo's from original type
var properties = typeof(T).GetProperties().Where(p => propertyNames.Contains(p.Name));
// Create the x => expression
var lambdaParameterExpression = Expression.Parameter(typeof(T));
// Create the x.<propertyName>'s
var propertyExpressions = properties.Select(p => Expression.Property(lambdaParameterExpression, p));
// Creating anonymous type using dictionary of property name and property type
var anonymousType = AnonymousTypeUtils.CreateType(properties.ToDictionary(p => p.Name, p => p.PropertyType));
var anonymousTypeConstructor = anonymousType.GetConstructors().Single();
var anonymousTypeMembers = anonymousType.GetProperties().Cast<MemberInfo>().ToArray();
// Create the new {} expression using
var anonymousTypeNewExpression = Expression.New(anonymousTypeConstructor, propertyExpressions, anonymousTypeMembers);
var selectLambdaMethod = GetExpressionLambdaMethod(lambdaParameterExpression.Type, anonymousType);
var selectBodyLambdaParameters = new object[] { anonymousTypeNewExpression, new[] { lambdaParameterExpression } };
var selectBodyLambdaExpression = (LambdaExpression)selectLambdaMethod.Invoke(null, selectBodyLambdaParameters);
var selectMethod = GetQueryableSelectMethod(typeof(T), anonymousType);
var selectedQueryable = selectMethod.Invoke(null, new object[] { queryable, selectBodyLambdaExpression }) as IQueryable;
return selectedQueryable;
}
I am experimenting with the example CalculatePrice on the Dynamics CRM example page.
And im having a hard time understanding how to get products and bundles in a good manner.
What i wanna try and do is get products from an order with a productstructure attribute and a producttypecode. But it seems whatever i try i get a error The given key was not present in the dictionary.
The query below should look for productID from salesorder based on productID
QueryExpression query = new QueryExpression("salesorderdetail");
query.ColumnSet.AddColumns("quantity", "salesorderispricelocked", "priceperunit", "producttypecode", "_productid_value");
query.Criteria.AddCondition("salesorderid", ConditionOperator.Equal, entity.Id);
QueryExpression query2 = new QueryExpression("product");
query2.ColumnSet.AddColumns("productstructure", "productnumber" , "productid");
query.Criteria.AddCondition("productid", ConditionOperator.Equal, ec.Entities["_productid_value"]);
Then i try to iterate the list of objects to see if they have productstructure and their producttypecode
for (int i = 0; i < ec.Entities.Count; i++)
{
if (ec.Entities[i].GetAttributeValue<int>("producttypecode") == 6)
{ you are a product
if (ec.Entities[i].GetAttributeValue<int>("productstructure") == 3){ you are a bundle
This is the link to the sample code i use:
https://learn.microsoft.com/en-us/dynamics365/customer-engagement/developer/sample-calculate-price-plugin
For starters, the _productid_value notation is the WebAPI's way to access a lookup field. To access the productid using the SDK's late-bound paradigm, use:
myEntity["productid"] or
myEntity.GetAttributeValue<Guid>("productid") or
myEntity.GetAttributeValue<EntityReference>("productid").
Beyond that, since Product is a lookup on the OrderDetail, using a couple LinkEntity objects you could get away with a single query.
I would probably use LINQ and do something like this:
private void getProducts(Guid salesOrderId)
{
using (var context = new Microsoft.Xrm.Sdk.Client.OrganizationServiceContext(svc))
{
var query = from od in context.CreateQuery("salesorderdetail")
join so in context.CreateQuery("salesorder")
on od.GetAttributeValue<Guid>("salesorderid") equals so.GetAttributeValue<Guid>("salesorderid")
join p in context.CreateQuery("product")
on od.GetAttributeValue<Guid>("productid") equals p.GetAttributeValue<Guid>("productid")
where od.GetAttributeValue<Guid>("salesorderid").Equals(salesOrderId)
select new
{
OrderDetailId = od.GetAttributeValue<Guid>("salesorderdetailid"),
ProductId = od.GetAttributeValue<EntityReference>("productid"),
Quantity = od.GetAttributeValue<decimal?>("quantity"),
IsPriceLocked = so.GetAttributeValue<bool?>("ispricelocked"),
PricePerUnit = od.GetAttributeValue<Money>("priceperunit"),
ProductTypeCode = od.GetAttributeValue<OptionSetValue>("producttypecode"),
ProductStructure = p.GetAttributeValue<OptionSetValue>("productstructure"),
ProductNumber = p.GetAttributeValue<string>("productnumber")
};
var results = query.ToList();
var products = results.Where(e => e.ProductStructure.Value == 6).ToList();
var bundles = results.Where(e => e.ProductStructure.Value == 3).ToList();
}
}
Please note that local variables results, products, and bundles are an anonymous type. You can loop through and access the properties of each object, but there's also a strong chance you'd want to cast them into instances of a real class.
I am trying to build up a mongo query, I very nearly have it working in Linq (95% there), but it looks like there is an unfortunate missing ability in the Linq provider to do the equivalent of an Intersect(coll).Any() or in Mongo parlance AnyIn()
I understand that if I use the fluent library with some builders I can build up a filter that will give me an AnyIn() - but what I am missing is how could I build up the whole query, the initial filter, the aggregation, projection and the filter at the end?
This is a very close approximation of my Linq query - this works exactly as required as long as I am not trying to compare collection membership in the filter
public List<MyResult> ListMyResults(Expression<Func<MyResult, bool>> filter, int skip, int take)
{
// Limit to tennants on main Entity being queried
var ents = ApplyDataRestrictions(db.GetCollection<Entity>("entities").AsQueryAble());
var children = db.GetCollection<Child>("children").AsQueryable();
var chickens = db.GetCollection<Chicken>("chickens").AsQueryable();
// Join a couple collections for their counts
var result = from ent in ents
join c in children on ent.Id equals c.EntityId into kids
join ck in chickens on ent.Id equals ck.EntityId into birds
// Project the results into a MyResult
select new MyResult
{
Id = ent.Id,
AProperty = ent.AProperty,
SomeCollection = ent.SomeCollection,
SomeOtherCollectionTagsMaybe = ent.SomeOtherCollectionTagsMaybe,
TotalKids = kids.Count(),
TotalChickens = birds.Count()
};
if(filter != null)
{
// Apply the filter that was built up from criteria on the MyResults data shape
result = result.Where(filter);
}
result = result.Skip(skip).Take(take);
return result.ToList()
}
public IQueryable<Entity> ApplyDataRestrictions(IQueryable<Entity> query)
{
... restrict results to only those with my tennant id ...
}
Actually it turns out that the same behavior can be achieved without Query Builder and AnyIn. Having IQueryable interface you can try .Any() with Contains() as inner predicate
var inMemoryList = new List<int>() { 3, 4, 5 };
var q = from doc in Col.AsQueryable()
where doc.Collection.Any(x => inMemoryList.Contains(x))
select doc;
or
var q2 = Col.AsQueryable().Where(x => x.Collection.Any(y => inMemoryList.Contains(y)));
I have Two classes Named OfflineOrderLineItem.cs and OnlineOrderLineItem.cs both have diff Order table named offline and Online
In that i want to Combine the two tables data to search and Display the Fields from both tables
How to do that using linq in mvc4 ??? any idea.....
public virtual IPagedList<OnlineOrderLineItem> SearchOrderLineItems(string PoNumber)
{
var query1 = (from ol in _offlineOrderLineItemRepository.Table
select new
{
ol.Name
}).ToList();
var query2 = (from opv in _onlineOrderLineItemRepository.Table
select new
{
opv.Name
}).ToList();
var finalquery = query1.Union(query2);
if (!String.IsNullOrWhiteSpace(Name))
finalquery = finalquery.Where(c => c.Name == Name);
var orderlineitems = finalquery.ToList(); //its not working it throw a error
return new PagedList<OnlineOrderLineItem>(orderlineitems);//error
}
Error
cannot convert from 'System.Collections.Generic.List<AnonymousType#1>'
to 'System.Linq.IQueryable<Nop.Core.Domain.Management.OnlineOrderLineItem>'
to 'System.Linq.IQueryable<Nop.Core.Domain.Management.OnlineOrderLineItem>'
query1 and query2 are lists of an anonymous type with a single property of type string. (I assmume the ol.Name and opv.Name are strings.) Hence finalQuery and orderlineitems are collections of this anonymous as well. By specifying PagedList<T> you require that the collection passed into the constructor is an enumeration of type T. T is OnlineOrderLineItem, but the enumeration passed into the constructor is the anonymous type which is a different type. Result: compiler error.
To solve the problem I suggest that you define a named helper type that you can use to union the two different types OfflineOrderLineItem and OnlineOrderLineItem:
public class OrderLineItemViewModel
{
public int Id { get; set; }
public string PoNumber { get; set; }
public string Name { get; set; }
// maybe more common properties of `OfflineOrderLineItem`
// and `OnlineOrderLineItem`
}
Then your SearchOrderLineItems method should return a paged list of that helper type:
public virtual IPagedList<OrderLineItemViewModel> SearchOrderLineItems(
string PoNumber)
{
var query1 = from ol in _offlineOrderLineItemRepository.Table
select new OrderLineItemViewModel
{
Id = ol.Id,
PoNumber = ol.PoNumber,
Name = ol.Name,
// maybe more properties
};
// don't use ToList here, so that the later Union and filter
// can be executed in the database
var query2 = from opv in _onlineOrderLineItemRepository.Table
select new OrderLineItemViewModel
{
Id = opv.Id,
PoNumber = opv.PoNumber,
Name = opv.Name,
// maybe more properties
};
// don't use ToList here, so that the later Union and filter
// can be executed in the database
var finalquery = query1.Union(query2);
// again no ToList here
if (!string.IsNullOrWhiteSpace(PoNumber))
finalquery = finalquery.Where(c => c.PoNumber == PoNumber);
var orderlineitems = finalquery.ToList(); // DB query runs here
return new PagedList<OrderLineItemViewModel>(orderlineitems);
}
It is important to use ToList only at the very end of the query. Otherwise you would load the whole tables of all OnlineOrderLineItems and all OfflineOrderLineItems into memory and then filter out the items with the given PoNumber in memory which would be a big overhead and performance desaster.
Instead of
var orderlineitems = finalquery.ToList();
Try
var orderlineitems = finalquery.AsQueryable();
From https://github.com/TroyGoode/PagedList/blob/master/src/PagedList/PagedList.cs, PagedList takes a IQueryable<T>
Queryable.AsQueryable<TElement> Method
What's the equivalent LINQ instruction for a Datatable of the following SQL query:
SELECT code_direction, count(TP) AS CN
FROM table1
WHERE cod_time = 'A011'
GROUP BY TP,code_direction;
and how to get the result into a new datatable?
I tried to convert it but I there're some errors. Someone could take a look on this:
var query = from t in table1.AsEnumerable()
group t by new { t.TP, t.code_direction }
into grp
select new
{
grp.Key.code_direction,
CN = grp.Count(t.TP)
};
foreach (var x in query)
{
Console.Write(x.code_direction);
Console.Write(x.CN);
}
As far as your first question goes. The LINQ equivalent of the SQL query is:
var query = from t in table1.AsEnumerable()
where t.cod_time == "A011"
group t by new { t.TP, t.code_direction }
into grp
select new
{
grp.Key.code_direction,
CN = grp.Count()
};
Note that you don't have to pass any argument to grp.Count(). (For the obvious reason that in SQL COUNT(TP) is the same as COUNT(*), i.e. just count the number of rows. The story would be different if you'd use COUNT(DISTINCT TP) or similar.)
As far as the second question goes, if your query just returned an IEnumerable<T> where T is DataRow (i.e. a query like table1.AsEnumerable().Where(r => r.cod_time == "A011")) then you could just the DataTableExtensions.CopyToDataTable extension method. As your query returns an anonymous type however, you will have to follow these instructions found on MSDN.
I Have been using LINQ to work on a JSON object returned from a remote sharepoint web service. I have posted this because most of the answers I found online were slightly different from what I needed.
a json list of daily activities is returned from a remote sharepoint list & is then summarised using LINQ
The simplified version of a custom object definition is shown below( & which is defined in the models area of an MVC application)
public class MyCustomObjectList
{
public string eventdate { get; set; }
public string userid { get; set; }
public string action { get; set; }
}
The JSON object is serialised into a MyCustomObjectList array.
var customobject = serializer.Deserialize<MyCustomObjectList>(jsonobject);
I wanted to work out how many actions of each type happened on a given day. NB eventdate is stored as a string in format yyyy-mm-dd hh:MM:ss. This was to simplify conversions between c#, JSON & Jquery ( where required I create DateTime objects elsewhere in the code using the
eventdate.
Some will argue this is inefficient, but I prefer to split processes into a sequential set of really simple operations, for the sake of easier debugging & to help other people follow my code. Thats why there are 2 Linq queries .
querya strips out the time component from the eventdate This ensures our later grouping happens by day, & not by second. To be doubly sure that there is no caching, I create it in a new field called actionday. I also rename action to activity, because intellisense was getting confused!! The other columns are copied as is.
var querya =
from c in customobject.rows
select new { actionday = c.eventdate.Substring(0, 10), activity = c.action, c.userid,
c.eventdate };
/* queryb produces a grouped count of querya, grouped on actionday & activity, creating new columns actionkey,ActionCount,Dte,action & DetailList ( which is a summary for debugging purposes)
*/
var queryb=
from p in querya group p by new { p.actionday, p.activity} into idGroup
actionkey = idGroup.Key,
ActionCount = idGroup.Count(),
Dte = idGroup.Key.actionday,
action = idGroup.Key.activity,
DetailList = idGroup
};
Here’s a version that sumarises by 3 columns
var queryc = from p in querya
group p by new { p.actionday, p.userid, p.activity} into idGroup
select new
{
actionday = idGroup.Key,
ActionCount = idGroup.Count(),
userid = idGroup.Key.userid,
Dte = idGroup.Key.actionday,
action = idGroup.Key.activity,
DetailList = idGroup
};