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Cannot Assign Anonymous Method To Anonymous Type Property


Prepared for Yet Another Simple Rebus? Extension Methods, Implicitly Typed Variables, and Object Initializers - looks at three language enhancements to VB and C# that, in part, allow for LINQ's unique syntax and functionality. Partial classes have been around since 2.0. Anonymous types are also useful in query expressions. have a peek at this web-site

Although you can always invoke the extension method via the namespace qualified class name (Foo.StringExtensions.ToDouble()), there is no mechanism available to reach a single extension method using an instance syntax unless These types of projections are useful when creating data transfer objects or restricting the amount of data coming back in a LINQ to SQL query. With an understanding of lambda expressions, expression trees, and extension methods, we are finally able to tackle one of the beauties of LINQ in C# - the query expression. For instance, the System.String class is compiled into the .NET framework as a sealed class.

Cannot Assign Method Group To Anonymous Type Property Mvc

LINQ to SQL inspects the expression tree and converts the expression tree into a SQL command. Trying to replace the lambda by an anonymous method didn't help, the same error kept popping. In general, a lambda expression in C# can take one of the following forms: // C# lambda expression syntax
single input parameter => expression

single input

Browse other questions tagged c# .net-3.5 delegates lambda implicit-typing or ask your own question. In this case, the C# compiler can deduce that s is of type string. But just how can a developer "pass" a method to the Where standard query operator as an input parameter? var x4 = (int y)=>{ throw new Exception(); } Again, we don't know the return type, and this time it can be void.

up vote 94 down vote favorite 32 I have the following code: Func comparer = delegate(string value) { return value != "0"; }; However, the following does not compile: var C# Cannot Assign Lambda Expression To An Implicitly Typed Local Variable Is the English word "ikebana" a suitable translation for "華道"? Between the curly braces, the object initializer lists a sequence of properties and their initial values. http://stackoverflow.com/questions/4965576/why-cant-an-anonymous-method-be-assigned-to-var How can I declare independence from the United States and start my own micro nation?

The nth numerator Add comments to a python script and make it a bilingual python/C++ “program” How small could an animal be before it is consciously aware of the effects of How can tilting a N64 cartridge cause such subtle glitches? So you can do your little logic inside var jobSummaries = jobs.Select(j => { var someVar = j + "bla"; return new { somelogic = someVar }; }); share|improve this answer Why was Susan treated so unkindly?

C# Cannot Assign Lambda Expression To An Implicitly Typed Local Variable

Without opening the PHB, is there a way to know if it's a particular printing? var x5 = (int y)=> q += y; Is that intended to be a void-returning statement lambda or something that returns the value that was assigned to q? Cannot Assign Method Group To Anonymous Type Property Mvc string[] cities = { "Boston", "Los Angeles", "Seattle", "London", "Hyderabad" };IEnumerable filteredList =cities.Where(s => s.StartsWith("L")); The distinguishing feature in this code is the "goes to" operator (=>). C# Func I guess that would work too;var foo = new { Bar = default(string) }; 6/23/2012 4:17 PM | Mario #re: C#/.NET Little Wonders: The Joy of Anonymous Types @Mario: Yes, default(string)

Using the Query Syntax - learn how to write and use C# and Visual Basic's new query syntax, which lets you write LINQ queries using SQL-like syntax. http://electrictricycle.net/cannot-assign/cannot-assign-void-to-anonymous-type-property.html Join them; it only takes a minute: Sign up Why can't an anonymous class have a lambda property, but it can have a Func<> property? [duplicate] up vote 14 down vote I cannot set lambda expression as a local variable with 'let'. The implementation of the Where clause for IEnumerable executes the lambda expression via a delegate to filter the collection of in-memory objects.

Is the English word "ikebana" a suitable translation for "華道"? How to harness Jupiter's gravitational energy? All JavaScript objects are really just HashTables and doesn't enforce much during compile time. –Kevin Jul 16 '14 at 1:39 | show 2 more comments up vote 2 down vote No, http://electrictricycle.net/cannot-assign/cannot-assign-method-group-to-anonymous-type-property.html Expression trees allow LINQ providers to transform the query into SQL, XPath, or some other native query language that works best for the data source.

Instead of taking delegates as parameters like the IEnumerable Where method does, IQueryable will take Expression parameters. Probability of All Combinations of Given Events Why was Susan treated so unkindly? We are using an implicitly typed signature and letting the C# compiler figure out the type of the parameter based on the context.

See http://msdn.microsoft.com/en-us/library/bb397733.aspx.   Hope that helps,   --Samir   Wednesday, June 04, 2008 5:03 PM Reply | Quote All replies 0 Sign in to vote Is it the case that one

It is important to realize that extension methods have no special privileges with respect to member access of the target object. Next, the Select operator is used to create a new anonymous type that contains two properties named Name and Compensation, whose values are populated from the Name and Salary properties of share|improve this answer answered Feb 11 '11 at 4:55 nybbler 3,9031720 add a comment| up vote 0 down vote How is about that? Browse other questions tagged c# lambda anonymous-types anonymous-methods or ask your own question.

You'll also notice the function signature doesn't include any type information for the parameter named s. The Where operator is one such example, which filters a collection based on a supplied delegate. But we have this problem all the time, and we just use method type inference to deduce the type: Func WorkItOut(Func f) { return f; } ... http://electrictricycle.net/cannot-assign/cannot-assign-method-group-to-anonymous-type-property-linq.html share|improve this answer answered Jul 16 '14 at 1:16 Daniel Mann 20.5k33464 Could you please provide a link to the official documentation.

Is there a name for the (anti- ) pattern of passing parameters that will only be used several levels deep in the call chain? Seems like a lot of work. You'll notice that the lambda expression doesn't require a delegate keyword. Comparing Anonymous Type Instances Because anonymous types automatically create appropriate overrides of Equals() and GetHashCode() based on the underlying properties, we can reliably compare two instances or get hash codes.  For

These extension methods extend IEnumerable and IQueryable to implement the standard query operators, like Where, Select, OrderBy, and many more. How to NOT render a part of a document What is really curved, spacetime, or simply the coordinate lines? Comment: Please enter a comment Verification: Remember Me? MSDN Reference: Anonymous Methods I would suspect that since the anonymous method may actually have different method signatures, the compiler is unable to properly infer what the most appropriate type to

An extension method is only available when you import the namespace containing the static class that defines the extension method (with a using statement). iptables not dropping by IP and port? They look the same, but are completely different. Bundling using Cassette in Asp.Net MVC I am a big fan of Cassette library.

On 1941 Dec 7, could Japan have destroyed the Panama Canal instead of Pearl Harbor in a surprise attack? Syntactic Sugar, Anyone? var Contact = new { First = "", Last = "", FullName = First + " " + Last }; // Error: Cannot assign lambda expression to anonymous type property var With that class defined, I can create and use Employee objects from any ASP.NET page in my website, or from other classes in my project.

An empty set of parentheses is required when there are no parameters for the expression.