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Cannot Assign Method Group To Anonymous Type Property Mvc


http://profiles.google.com/mike.strobel Mike Strobel  This is not actually a limitation of range variables; you could not do this, either: var fct = (int x) => (x - 5) * (x - 5);The C# compiler cannot create a delegate from a lambda expression (or any By some other mechanism? Center trace between two pads lowercase breadcrumbs Why put a warning sticker over the warning on this product? 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 this contact form

Technorati Tags: C#,CSharp,.NET,Little Wonders,Anonymous Types,LINQ Share This Post:Short Url: http://wblo.gs/d1d Print | posted on Thursday, June 21, 2012 7:53 PM | Feedback #re: C#/.NET Little Wonders: The Joy of Anonymous Types Why is this C++ code faster than my hand-written assembly for testing the Collatz conjecture? And although a Predicate is functionally equivalent to a Func, they are still different types at the level of the .NET type system. Browse other questions tagged c# lambda anonymous-types anonymous-methods or ask your own question.

Cannot Assign Method Group To Anonymous Type Property Mvc

I suspect it's a combination of at least two factors: 1) the compiler cannot infer the type of a lambda in most cases -- is it a Func or an Expression? How can I check that the voltage output from this voltage divider is 2.25V? Therefore, our lambda expression defines a single input parameter (num, in the above example) and an expression that returns a Boolean value. For example, consider the following delegate type: C# Copy public delegate TResult Func(TArg0 arg0) The delegate can be instantiated as Func myFunc where int is an input parameter and bool

long? Just as with any other method, the call to a delegate is strongly typed, and if the data types do not match up, then the C# compiler reports an error. lambda expression Hot Network Questions How can I declare sovereignty from the American government and start my own micro nation? Beginning with C# 2.0, you simply specify the name of the delegate method (see Listing 12.8).

Section 8.5.1 of the language specification specifically highlights this reason for disallowing anonymous functions from being used in implicitly typed variable declarations. –Anthony Pegram Feb 11 '11 at 4:47 Delegate Data Types To increase the flexibility (and reduce code duplication), you can pass in the comparison method as a parameter to the BubbleSort() method. Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). b = {1}", j, boolResult); } static void Main() { Test test = new Test(); test.TestMethod(5); // Prove that del2 still has a copy of // local variable j from TestMethod.

So if you are querying an IEnumerable, then the input variable is inferred to be a Customer object, which means you have access to its methods and properties: C# Copy customers.Where(c It looks like a Converter to me! –Ben Voigt Feb 11 '11 at 4:46 possible duplicate of Why can't c# use inline anonymous lambdas or delegates? –nawfal May Conclusion LINQ's SQL-like query syntax is possible due to a number of enhancements to the C# and Visual Basic programming languages. The Ins and Outs of Query Operators - learn how query operators provide a universal approach to querying and modifying enumerable collections of data.

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

Introducing LINQ to XML - provides an overview of working with XML data using the LINQ to XML API. http://codebetter.com/patricksmacchia/2011/05/16/workaround-of-a-pesky-linq-limitation/ The situation where it is actually useful is: var xAnon = (int y)=>new { Y = y }; because there is no "speakable" type for that thing. Cannot Assign Method Group To Anonymous Type Property Mvc Do you sort by the values in the Name property? C# Func The List class has a Sort method that will sort the items in the list, but this begs the question: How can the List possibly sort its contents when it doesn't

share|improve this answer edited Mar 3 '10 at 14:06 answered Mar 3 '10 at 13:33 Mark Seemann 151k25262448 I just tried. weblink By the Salary property? What exactly are sleeping stalls versus waiting-rooms, for airport layovers? Expression lambdas are used extensively in the construction of Expression Trees.

This causes a smaller amount of data to be returned in the query.If you do not specify member names in the anonymous type, the compiler gives the anonymous type members the bool boolResult = del(); // Output: j = 10 b = True Console.WriteLine("j = {0}. The following Func delegate, when it is invoked, will return true or false to indicate whether the input parameter is equal to 5: C# Copy Func myFunc = x => navigate here For example, the following snippet of code creates a new object that has two properties, Name and Salary, with values "Scott" and 50,000, respectively. // C#
var EmployeeOfTheMonth =

It will coerce or use a type, if you use the anonymous method in a context where such a type can be determined, like in a method call, but in this See ASP.NET Ajax CDN Terms of Use – http://www.asp.net/ajaxlibrary/CDN.ashx. ]]> Developer Network Developer Network Developer Sign in MSDN subscriptions In short, the Select operator is enumerating each Employee object in TopWorkers and for each one it's calling the passed-in method, which generates a new object with an anonymous type whose

That's why you have to specify the type explicitly.

The content you requested has been removed. e.g., Action is different than MethodInvoker, and an instance of Action can't be assigned to a variable of type MethodInvoker. let fileName = job.Files.Select(f => f.LocalName).FirstOrDefault() select new { ID = job.ID, Description = job.Description, FileName = fileName }; Notice the use of the let keyword, that lets you extract the 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.

They share the same compiler-generated type information.You cannot declare a field, a property, an event, or the return type of a method as having an anonymous type. In addition to MethodInfo, a delegate also needs the instance of the object containing the method to invoke. To construct an anonymous type instance, you use basically the same initialization syntax as with a regular type.  So, for example, if we wanted to create an anonymous type to represent his comment is here short?

A projection operator is one that takes the original object type and creates a new type with specified properties. Newton's second law for individual forces Why are password boxes always blanked out when other sensitive data isn't? What is the definition of "rare language"? 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,

Prepared for Yet Another Simple Rebus? With the delegate approach, you can change the sort order to be alphabetical simply by adding an alternative delegate to convert integers to strings as part of the comparison. Join them; it only takes a minute: Sign up Can we add a method to an anonymous type that refers to the anonymous type's members? [duplicate] up vote 2 down vote Since comparisonMethod represents a method, the syntax to invoke the method is identical to calling the method directly.

Page 1 of 5 Next > + Share This 🔖 Save To Your Account Related Resources Store Articles Blogs Begin to Code with C# By Rob Miles Book $31.99 Begin to Declaring a Delegate Data Type public delegate bool ComparisonHandler ( int first, int second); In other words, the delegate keyword is shorthand for declaring a reference type derived ultimately from System.Delegate. Is it possible to write division equation in more rows? I cannot set lambda expression as a local variable with 'let'.

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