linq-to-objects

see also Differences between LINQ to Objects and LINQ to SQL queries We are using the some queries over our database and our in memory objects . What is the best way of doing an insensitive string compare with linq-to-sql so that? It runs fast on SQL Server The same query expression can be used with linq-to-objects to get the same result Using a.ToLowerInvariant() == b.ToLowerInvariant() at least gets the same results, but it does not get processed on SQL server as far as I can tell, so can be a lot slower then a == b I'm not an expert in linq to sql, but you could just use the

I need to order the articles stored in a database by descending publication date and then take the first 20 records after the article with Id == 100 . This is what I would like to do with Linq: IQueryable<Article> articles = db.Articles .OrderByDescending(a => a.PublicationDate) .SkipWhile(a => a.Id != 100) .Take(20); However, this generates a NotSupportedException because SkipWhile is not supported in Linq to Sql (see here ). A possible solution is to execute the query and then apply SkipWhile using Linq to Object: IEnumerable<ArticleDescriptor> articles = db.Articles .OrderByDescending(a =>

It seems Linq2sql doesn't know how to construct the TSQL while you transform linq2sql object into domain object with constructors. Such as: from c in db.Companies select new Company (c.ID, c.Name, c.Location).Where(x => x.Name =="Roy"); But when using settable attributes, it will be OK. from c in db.Companies select new Company { ID = c.ID, Name = c.Name, Location = c.Location }.Where(x => x.Name =="Roy"); I don't want to allow those attributes to be settable. How can I achieve this? And can anybody provide food for thought on how linq 2 sql is translated into TSQL? Thanks in advance! It's

I have a database that has a user search screen that is "dynamic" in that I can add additional search criteria on the fly based on what columns are available in the particular view the search is based on and it will allow the user to use them immediately. Previously I had been using nettiers for this database, but now I am programming a new application against it using RIA and EntFramework 4 and LINQ. I currently have 2 tables that are used for this, one that fills the combobox with the available search string patterns: LastName LastName, FirstName Phone etc.... then I have an other table that

I'm trying to call a function in a dynamic linq select statement, but im getting error: No property or field 'A' exists in type 'Tuple2' Example code: void Main() { var a = new Tuple<int, int>(1,1); var b = new[]{ a }; var q = b.AsQueryable().Select("A.Test(it.Item1)"); q.Dump(); } public static class A { public static int Test(int i) { return i++; } } How should I change my code to get this working? If I call built in function Convert.ToInt32 for example it works fine. var q = b.AsQueryable().Select("Convert.ToInt32(it.Item1)"); Also how do I cast a property using dynamic linq? var q = b

Assuming I have a simple structure that looks like this: public class Range { public DateTime Start { get; set; } public DateTime End { get; set; } public Range(DateTime start, DateTime end) { this.Start = start; this.End = end; } } And I create an collection like so: var dr1 = new Range(new DateTime(2011, 11, 1, 12, 0, 0), new DateTime(2011, 11, 1, 13, 0, 0)); var dr2 = new Range(new DateTime(2011, 11, 1, 13, 0, 0), new DateTime(2011, 11, 1, 14, 0, 0)); var dr3 = new Range(new DateTime(2011, 11, 1, 14, 0, 0), new DateTime(2011, 11, 1, 15, 0, 0)); var dr4 = new Range(new DateTime(2011, 11, 1,