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How to Retrieve subgrid values using plugin and store that retrieved column value as comma separated in normal text field

I have sub grid called track and location in event entity. Now I want to retrieve the name of the sub grid values and store that values in the text field.In pathway List field I need to add track name as comma separated if it is associate. If it is disassociate I need to remove the particular value form text field.I am new to plugin. I tried query expression but I don't have any common filed for track and event entity to use filter condition. Can u any one suggest the way to achieve this quickly.
I tried below code:
if (context.MessageName.ToLower() == "associate")
{
// Obtain the target entity from the input parameters.
Entity eventEntity = new Entity("leap_event");
var pathwayList ="" ;
QueryExpression query = new QueryExpression("leap_event");
query.ColumnSet = new ColumnSet(true);
LinkEntity linkEntity1 = new LinkEntity("leap_event", "leap_leap_event_leap_location", "leap_eventid", "leap_eventid", JoinOperator.Inner);
LinkEntity linkEntity2 = new LinkEntity("leap_leap_event_leap_location", "leap_location", "leap_locationid", "leap_locationid", JoinOperator.Inner);
linkEntity1.LinkEntities.Add(linkEntity2);
query.LinkEntities.Add(linkEntity1);
linkEntity2.LinkCriteria = new FilterExpression();
linkEntity2.LinkCriteria.AddCondition(new ConditionExpression("", ConditionOperator.Equal, ""));
EntityCollection collRecords = service.RetrieveMultiple(query);
tracingService.Trace("load");
for (int i = 0; i < collRecords.Entities.Count; i++)
{
tracingService.Trace("load1");
var result = collRecords.Entities[i].GetAttributeValue<string>("leap_name");
Console.WriteLine(result);
pathwayList += result + ",";
tracingService.Trace("pathwayName" + pathwayList);
eventEntity["leap_pathwayList"] = pathwayList;
}
}

you will have to use alias for your linked Entity. Take a sample example below.
I have Account Entity--> (N:N) list member Entity--> (N:N) List Entity.
In your case it would be
leap_event Entity--> (N:N) leap_leap_event_leap_location Entity--> (most probably N:N or 1:N) leap_event_leap_location entity.
In addition when you retrieve attribute you will have to use GetAttributeValue<AliasedValue> Take a look at this article it will help you understand
// Instantiate QueryExpression query
var query = new QueryExpression("account");
// Add columns to query.ColumnSet
query.ColumnSet.AddColumns("name", "accountid");
// Add link-entity listmemberentity
var listmemberentity = query.AddLink("listmember", "accountid", "entityid");
listmemberentity.EntityAlias = "listmemberentity";
// Add link-entity listentity
var listentity = listmemberentity.AddLink("list", "listid", "listid");
listentity.EntityAlias = "listentity";
// Add columns to listentity.Columns
listentity.Columns.AddColumns("listname");

It is not necessary to use linkentity.
The QueryExpression must be performed directly on the associated entity, with filter on lookup field (I assume "leap_eventid" field on "leap_location" entity) :
if (context.MessageName.ToLower() == "associate")
{
var query = new QueryExpression("leap_location");
query.ColumnSet.AddColumn("leap_name");
// Lookup filter
query.Criteria.AddCondition(new ConditionExpression("leap_eventid", ConditionOperator.Equal, context.TargetEntity.Id));
// Optional statecode filter
query.Criteria.AddCondition(new ConditionExpression("statecode", ConditionOperator.Equal, 0));
var collRecords = service.RetrieveMultiple(query);
if (collRecords.Entities.Count > 0)
{
var pathwayList = string.Empty;
foreach (var location in collRecords.Entities)
{
pathwayList += location.GetAttributeValue<string>("leap_name") + ",";
tracingService.Trace($"pathwayName {pathwayList}");
}
}
var eventEntity = new Entity("leap_event", context.TargetEntity.Id)
{
["leap_pathwayList"] = pathwayList
};
service.Update(eventEntity); // Update required for PostOperation Plugin
}

How to resolve variable in Linq Query c#?

I have the below dynamic array
dynamic[] queueList = await queueInfo.Run.GetData<dynamic[]>(Name);
I want to get the unique values present in ImportTableName field. So, after some search I found this,
var distNames = queueList.Select(o => new {o.ImportTableName }).Distinct();
which works as expected.
But I don't want to hard code the fieldname "ImportTableName". So tried doing something like this
dynamic[] queueList = await queueInfo.Run.GetData<dynamic[]>(Name);
string tableName = "ImportTableName"
var distNames = queueList.Select(o => new {o.tableName }).Distinct();
But it doesn't work, result is just NULL. Can someone help me to achieve this ?

As it is array of JObject, which has indexer, you can apply it to each element to get value of desired field:
var distNames = queueList.Select(x => x[tableName]).Distinct().ToList();

My solution is:
dynamic[] queueList = new dynamic[]{new { id = 1, ImportTableName = "Data"}};
string propName = "ImportTableName";
var distNames = queueList.Select(d => d.GetType().GetProperty(propName).GetValue(d, null)).Distinct();
It returns as expected "Data".

Querying a list of strings with a query string?

I have a dictionary:
<string,List<string>>
The key is the product code say "product1" then the list is a list of properties:
"Brand","10.40","64","red","S"
Then I 'can' have a list of rules/filters e.g.
var tmpFilter = new customfilters();
tmpFilter.Field = "2";
tmpFilter.Expression = ">";
tmpFilter.Filter = "10";
So for the above example this would pass because at index 2 (tmpFilter.Field) it is more than 10; then I have another object which defines which fields within the list I want to write to file. For that dictionary item I just want to write the product brand and price where the filters match.
At the moment without the filter I have:
var tmp = new custom();
tmp.Columns = "0,1";
tmp.Delimiter = ",";
tmp.Extention = ".csv";
tmp.CustomFilters = new List<customfilters>() {new customfilters(){ Field = "2", Expression = ">", Filter = "10"} };
public static void Custom(custom custom)
{
foreach (var x in Settings.Prods)
{
//Get Current Product Code
var curprod = Settings.ProductInformation[x];// the dictionary value
foreach (var column in custom.Columns)
{
var curVal = curprod[Convert.ToInt32(column)];
tsw.Write(curVal + custom.Delimiter);
}
Settings.Lines++;
tsw.WriteLine();
}
tsw.Close();
}
I only want to write the curprod if all the filters pass for that list of strings.
How I can do this?

There's a really nice Nuget package based on an example published by Microsoft, that they have decided to make really hard to find for some reason, that allows dynamic linq queries:
https://www.nuget.org/packages/System.Linq.Dynamic/1.0.2
Source:
https://github.com/kahanu/System.Linq.Dynamic
Using that you can do stuff like this very easily (note: I used strings here because the OP states they have a List<string>):
List<string> stuff = new List<string> { "10.40", "64", "5", "56", "99", "2" };
var selected = stuff.Select(s => new { d = double.Parse(s) }).Where("d > 10");
Console.WriteLine(string.Join(", ", selected.Select(s => s.d.ToString()).ToArray()));
Outputs:
10.4, 64, 56, 99
That may give you a place to start. One thing you are going to have to tackle is identifying which of your fields are numeric and should be converted to a numeric type before trying to apply your filter. Otherwise you are going to comparing as strings.

LINQ and creating NON anonymous return values

I think I understand returning records of an anonymous type from But in this I want to create NEW CatalogEntries, and set them from the values selected. (context is a Devart LinqConnect database context, which lets me grab a view).
My solution works, but it seems clumsy. I want to do this in one from statement.
var query = from it in context.Viewbostons
select it;
foreach (GPLContext.Viewboston item in query)
{
CatalogEntry card = new CatalogEntry();
card.idx = item.Idx;
card.product = item.Product;
card.size = (long)item.SizeBytes;
card.date = item.Date.ToString();
card.type = item.Type;
card.classification = item.Classification;
card.distributor = item.Distributor;
card.egplDate = item.EgplDate.ToString();
card.classificationVal = (int)item.ClassificationInt;
card.handling = item.Handling;
card.creator = item.Creator;
card.datum = item.Datum;
card.elevation = (int)item.ElevationFt;
card.description = item.Description;
card.dirLocation = item.DoLocation;
card.bbox = item.Bbox;
card.uniqID = item.UniqId;
values.Add(card);
}
CatalogResults response = new CatalogResults();
I just tried this:
var query2 = from item in context.Viewbostons
select new CatalogResults
{ item.Idx,
item.Product,
(long)item.SizeBytes,
item.Date.ToString(),
item.Type,
item.Classification,
item.Distributor,
item.EgplDate.ToString(),
(int)item.ClassificationInt,
item.Handling,
item.Creator,
item.Datum,
(int)item.ElevationFt,
item.Description,
item.DoLocation,
item.Bbox,
item.UniqId
};
But I get the following error:
Error 79 Cannot initialize type 'CatalogService.CatalogResults' with a
collection initializer because it does not implement
'System.Collections.IEnumerable' C:\Users\ysg4206\Documents\Visual
Studio
2010\Projects\CatalogService\CatalogService\CatalogService.svc.cs 91 25 CatalogService
I should tell you what the definition of the CatalogResults is that I want to return:
[DataContract]
public class CatalogResults
{
CatalogEntry[] _results;
[DataMember]
public CatalogEntry[] results
{
get { return _results; }
set { _results = value; }
}
}
My mind is dull today, apologies to all. You are being helpful. The end result is going to be serialized by WCF to a JSON structure, I need the array wrapped in a object with some information about size, etc.

Since .NET 3.0 you can use object initializer like shown below:
var catalogResults = new CatalogResults
{
results = context.Viewbostons
.Select(it => new CatalogEntry
{
idx = it.Idx,
product = it.Product,
...
})
.ToArray()
};
So if this is only one place where you are using CatalogEntry property setters - make all properties read-only so CatalogEntry will be immutable.
MSDN, Object initializer:
Object initializers let you assign values to any accessible fields or properties of an
object at creation time without having to explicitly invoke a constructor.

The trick here is to create a IQueryable, and then take the FirstOrDefault() value as your response (if you want a single response) or ToArray() (if you want an array). The error you are getting (Error 79 Cannot initialize type 'CatalogService.CatalogResults' with a collection initializer because it does not implement 'System.Collections.IEnumerable') is because you're trying to create an IEnumerable within the CatalogEntry object (by referencing the item variable).
var response = (from item in context.Viewbostons
select new CatalogEntry()
{
idx = item.Idx,
product = item.Product,
size = (long)item.SizeBytes,
...
}).ToArray();

You don't have to create anonymous types in a Linq select. You can specify your real type.
var query = context.Viewbostons.Select( it =>
new CatalogEntry
{
idx = it.idx,
... etc
});

This should work:
var query = from it in context.Viewbostons
select new CatalogEntry()
{
// ...
};

Using an Anonymous method to populate a property in an object initializer

Assuming sr is an IEnumerable<string>, I want to use code like this to do an inline calculation using two of the items from sr.Lines(). The problem is that the lambda is of type "lambda expression" and not a Decimal, which shares is expecting. Is there any way to do this type of inline method in an object initializer?
var trades =
from line in sr.Lines()
let items = line.Split('|')
select new Trade
{
Total = () => {
return Convert.ToDecimal(items[1]) + Convert.ToDecimal(items[2]);
},
Name = items[3]
}

You want a decimal expression, not a function:
var trades =
from line in sr.Lines()
let items = line.Split('|')
select new Trade
{
Total = Convert.ToDecimal(items[1]) + Convert.ToDecimal(items[2]),
Name = items[3]
};

Just in case someone else ends up here looking for a solution like I did.
Check How to call anonymous function in C#?.
var trades =
from line in sr.Lines()
let items = line.Split('|')
select new Trade
{
Total = ((Func<decimal>)(() =>
{
return Convert.ToDecimal(items[1]) + Convert.ToDecimal(items[2]);
}))(),
Name = items[3]
};