linqpad

I am using following Linq query: from p in People where p.Name == "George Lucas" select p.TitlesActedIn where TitlesActedIn is a list. People and TitlesActedIn are associted But I am getting error: InvalidCastException: Unable to cast object of type 'System.Linq.Expressions.PropertyExpression' to type 'System.Data.Services.Client.ResourceExpression'. Please suggest solution. A very simple way to do it: var query = People .Expand("TitlesActedIn") .Where(p => p.Name == "George Lucas") .First() .TitlesActedIn.Select(t => t.ShortName); query.Dump(); Its important to note, that this will crash if

This is a follow-on from this question really: Moving From LINQpad to a Proper Visual Studio Project? ..but I'm not able to get it to work properly. An answer to that question suggestions dumping the context assembly out as a dll but although I have done that, when I import it as a reference, it's not exactly clear to me how I would create an instance of that context, point it at a database and actually run a query against it, something like the following: var db = new ContextFromThatDLL(myconnectionstring); var query = from a in db.MYTABLE where a.ID == 1 select a; Extra information: I am

When I run following in the LinqPad var ProductIds = from p in Products where p.Id = "F1FE990C-4525-4BFE-9E2C-A7AFFF0DDA1F" select p; ProductIds.Dump(); it gives me Cannot implicitly convert type 'string' to 'System.Guid' I just don't know how to apply proper cast it to GUid I guess Try using the Guid.Parse(string guid) static method. var ProductIds = from p in Products where p.Id == Guid.Parse("F1FE990C-4525-4BFE-9E2C-A7AFFF0DDA1F") select p; ProductIds.Dump(); You currently have an assignment, but you want to use a comparison - use == instead of = : var ProductIds = from p in Products where

In LinqPad, trying to call .Dump() on a Newtonsoft JSON.Net JObject yields an exception: RuntimeBinderException: 'Newtonsoft.Json.Linq.JObject' does not contain a definition for 'Dump'. This works for almost everything else in LinqPad. I'd like to figure out a method that will Dump out a Newtonsoft JObject , just like other objects, showing property names, values, etc. I've already figured out how to get it to dump the JSON string, but I'd like to see an object get output rather than just a text string. For anyone who lands here wanting to get pretty LINQPad output from a JSON string,

If one uses the F# Interactive Shell (FSI), the inferred expression type ( signature ) is printed to the console along with its value: val it : int * string * float = (42, "Hello F#", 42.0) How can I mimick the same behaviour in my own code, e.g. to get the inferred types as string for a F# expression? I don't need to dynamically evaluate any F# expressions, the expressions are known in compile time and are part of my (static) F# code. I need this feature to be able to mimick the FSI output in LINQPad for my F# demos. Stephen Swensen Using Unquote Unquote has a facility for getting the F#

As I was investigating the difference between Include and Join I found that : If the DB does not include a Foreign Keys -it has no navigation props so it's better to use Join If It does have a navigation props - then use Include . ( it also save a db hit.) But one answer here caught my attention: Include is implemented as a join. Depending on the nullability of the included link it is an inner or left join. Question : How does the nullity affects the left / inner join ? In Sql server I can have a Cities table and Persons table and a person can have a NULL CityID . Why does entity Framework

I'm having a strange problem with a linq query. I'm using LINQPad 4 to make some a query that uses regular expression using LinqToSQL as the LinqPad driver. Here's the query that I'm trying to make : (from match in from s in SystemErrors select Regex.Match(s.Description, "...") select new { FamilyCode = match.Groups["FamilyCode"].Value, ProductPrefix = match.Groups["ProductPrefix"].Value, BillingGroup = match.Groups["BillingGroup"].Value, Debtor = match.Groups["Debtor"].Value }).Distinct() As you can see I'm trying to extract data from a text description in a log table using groups. The query

I am using a view to return a complex search query. When I usin linq to query against EF it is returning the same row 3 times(the actual rowcount is correct). using LinqPad I have run the same linq against my ef entity and the actual database view. ReadmitPatientList .AsQueryable() .Where("PatientLastName.StartsWith(\"cooper\")") .OrderBy (rpl => rpl.PatientLastName) .Dump(); That is the linq I am using for both. linqpad shows the lambda as this: EF: ReadmitPatientList.MergeAs (AppendOnly) .Where ( => .PatientLastName.StartsWith ("cooper")) .OrderBy (rpl => rpl.PatientLastName) DB