Is it feasible to use string concatenation instead of IDs in a Linq query?

Is it feasible to create dynamic LINQ queries for datatables that aren't strongly typed?

AsEnumerable... returns an ...EnumerableRowCollection<DataRow>..., so the ...Select... extension method should work fine on the result of ...AsEnumerable.........For instance :...var query = dataSet.Tables[0].AsEnumerable().Select(row => row.Field<string>("Regional"));

How can I do a distinct on a dynamically selected column?

Instead of using ...as " + this.UniqueName + " ...do...as someFixedColumnName...and run your ...Distinct()... clause on that, using ordinary Linq....Alternatively, you could try ...this extension method:...public static IQueryable DynamicDistinct(this IQueryable source) { if (source == null) throw new ArgumentNullException("source"); return...

Generic method for constructing a string Dynamic Linq query. includes strings that have been tokenized

Here's what I use to do this:...using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Linq.Expressions; using System.Collections.ObjectModel; namespace MyLibrary.Extensions { /// <summary>Defines extension methods for building and working with Expressions.</summary> public static class Expressio...

Perform a query on an object having members of type "dynamic" using Dynamic Linq.

Are ...dynamic... members incompatible with Dynamic Linq queries?, or is there another way of constructing expressions that would evaluate properly when dealing with members of type ...dynamic...?...Both can work together. Just do a conversion to Int32 before doing the comparison like so:...IEnumerable<DataItem> result = repository.AsQu...

Is it feasible to use GPU to speed up (dynamic) LINQ queries?

I will answer definitively about Brahma since it's my library, but it probably applies to other approaches as well. The GPU has no knowledge of objects. It's memory is also mostly completely separate from CPU memory....If you do have a LARGE set of objects and want to operate on them, you can only pack the data you want to operate on into a buffer ...

How can I convert a LINQ query to a string and transmit it to a remote server to be parsed into an expression using Roslyn?

Roslyn will eventually give you the ability to take a LINQ expression in string form, parse it, and evaluate it. However, the current public CTP (the one released October 2011) does not support LINQ expressions.

Dynamic Linq query not working as expected - what am I doing wrong?

From your code it looks like you are operating on the var "query" which is an empty enumerable. Remember, what you have called query is the data set, the Where statement is the query on that data set. So the first query is on an empty data set and it looks like the additional queries from the foreach will just refine that empty set....Also, you can...

How to construct dynamic LINQ query string be for a query that looks like *abc*def*

It looks like what you need is ...IndexOf.... This returns the starting index of the substring, if it exists, otherwise -1....var.Contains("abc") && var.Contains("def") && var.IndexOf("abc") > var.IndexOf("def") ...For example, if we use the string ...XabcXdefXabc..., ...var.IndexOf("abc")... will yield ...1... and ...var.IndexOf("def")... will...

Linq Dynamic Query Issue - Operator 'OR' incompatible with operand types 'Boolean' and 'String'

Try this-... You cannot pass string inside a linq statement... valuesList = valuesList.Where(x=>x.position == 1 || x.value.Contains(3))

String concatenation in dynamic-linq Select

If I understand you right this should work....Imports System.Linq.Dynamic.Core Dim col1 = "id" Dim col2 = "name" Dim results = query.Select($"new({col1} as {col1}, {col2} as {col2}, {col1} & "" - "" & {col2} as {col1}_{col2})") ...There are maybe other ways, but you still will be o...