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Lambda Expressions: Execution

Lambda expressions can be assigned to a delegate variable. The lambda expression is then executed when the delegate is called. [To begin with an overview of lambda expressions, start here .] In the following example, a lambda expression is assigned to a variable (f). In C#: Func<int,string> f ...

Posted to Deborah's Developer MindScape by Deborah Kurata on Fri, Oct 16 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, Delegate
Lambda Expressions: Func Delegates

A Func delegate encapsulates a method that returns a value. It takes up to four parameters (and this number is increased in .NET 4.0) plus the return value. [To begin with an overview of lambda expressions, start here .] The following signature is a Func delegate that takes two integer parameters and...

Posted to Deborah's Developer MindScape by Deborah Kurata on Sun, Oct 11 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, Delegate
Lambda Expressions: Action Delegates

Just as the name implies, an action delegate encapsulates a method that performs an action and has no return value. It takes up to four parameters (and this number is increased in .NET 4.0). [To begin with an overview of lambda expressions, start here .] The ForEach method of the List<T> is an...

Posted to Deborah's Developer MindScape by Deborah Kurata on Sun, Oct 11 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, Delegate
Lambda Expressions: Predicate Delegates

According to Wikipedia , a predicate is “a function which returns a Boolean value”. [To begin with an overview of lambda expressions, start here .] A predicate delegate encapsulates a method that evaluates to True or False. It takes a single parameter. The Array class Find method is an example of a predicate...

Posted to Deborah's Developer MindScape by Deborah Kurata on Sun, Oct 11 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, Delegate
Lambda Expressions: Syntax

This post covers the syntax for lambda expressions. It uses the customer list defined in this prior post . [To begin with an overview of lambda expressions, start here .] The first example below uses the FirstOrDefault extension method on the Enumerable object to find the first customer that matches...

Posted to Deborah's Developer MindScape by Deborah Kurata on Sun, Oct 11 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda
Delegates

A delegate is an object that holds a reference to a method with a particular parameter list and return type. It is basically like an object-oriented, type-safe function pointer. Delegates basically make it possible to treat methods as entities. You can then assign a delegate to a variable or pass it...

Posted to Deborah's Developer MindScape by Deborah Kurata on Sun, Oct 11 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, Delegate
Lambda Expressions: Finding an Item in a Generic List

In this prior post , I detailed how to build lists of things using a generic List<T>. Once you have a list, you may need to find items in the list. There are several ways to accomplish this, but using lambda expressions is the most concise. [To begin with an overview of lambda expressions, start...

Posted to Deborah's Developer MindScape by Deborah Kurata on Sun, Oct 11 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, LINQ, Generics
Lambda Expressions: An Introduction

My presentation at our local Code Camp was fun. I covered a lot of material and had a GREAT audience. Several people have asked for the slide information in my blog. So this is the start of several posts on lambda expressions. In addition, I wrote an article on lambda expressions that should appear in...

Posted to Deborah's Developer MindScape by Deborah Kurata on Sun, Oct 11 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, Generics, Delegate
Enumerable.Range

The Enumerable class is new in .NET 3.5 and is part of the System.Linq namespace. It provides a set of static methods that allow you to query any object that implements IEnumerable, basically meaning any object that supports a for/each. This post focuses on the Range method of the Enumerable class and...

Posted to Deborah's Developer MindScape by Deborah Kurata on Fri, Sep 4 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda
Adding Nodes to an XML String

I have an XML string as follows: <States> <State name="Wisconsin"> <Regions> <Region name="Milwaukee"> <Area name="Mukwanago"/> ...

Posted to Deborah's Developer MindScape by Deborah Kurata on Thu, Aug 20 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, Xml, LINQ
Anonymous Types: An Introduction

The last several posts have provided examples of using anonymous types. This post backs up a little and provides an introduction if you are not already familiar with anonymous types. If you are familiar with anonymous types and are looking for more examples, check out these links: Defining Lists...

Posted to Deborah's Developer MindScape by Deborah Kurata on Wed, Aug 19 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, LINQ
Counting Words in a String Using Anonymous Types

This may be more of a homework assignment for a programming class than something you would do in your applications, but it is a good example of using anonymous types, which are new in .Net 3.5 in both VB and C#. [To begin with an overview of anonymous types, start here .] NOTE: Be sure to set a reference...

Posted to Deborah's Developer MindScape by Deborah Kurata on Mon, Aug 17 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, LINQ
Using Linq with Microsoft Word and Excel

Some of the collections in the Microsoft Office object models implement IEnumerable. The IEnumerable interface provides the ability to perform a for/each against the collection. With .NET 3.5, a Cast extension method of IEnumerable allows you to work with these collections using Linq. Microsoft Word...

Posted to Deborah's Developer MindScape by Deborah Kurata on Fri, Aug 14 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, LINQ, Binding, Excel
Linq: Sorting a DataTable

Last night, my husband (who is also a .NET developer) asked me about sorting a DataTable by user-defined columns. (Yes, we are a pretty exciting couple!) Most developers that work with DataTables know how to sort the DataTable using a DataView.Sort. If you are interested in that technique, you can view...

Posted to Deborah's Developer MindScape by Deborah Kurata on Thu, Jul 23 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, LINQ, DataTable
Dates: Binding to Month Names

Visual Studio comes with DateTimePicker and MonthCalendar controls that provide a standard looking calendar for the user to pick a date. But there are times when these controls don’t provide the features you need. For example, say you want to ask the user for the month and year that their credit card...

Posted to Deborah's Developer MindScape by Deborah Kurata on Tue, Jul 14 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda, Binding, WinForms
Lambdas: Aggregating Strings

Looping through a list to append strings is often more challenging than it should be. For example… In C#: string emailAddresses=string.Empty; foreach (Customer c in custList) { emailAddresses += c.EmailAddress + ";"; } In VB: Dim emailAddresses As String = String.Empty For...

Posted to Deborah's Developer MindScape by Deborah Kurata on Fri, Jul 3 2009
Filed under: Filed under: VB, C#, .NET, CSharp, Lambda
Lambda Expressions: Finding Differences in Two Lists

One of my favorite features in .NET 3.5 is lambda expressions. [To begin with an overview of lambda expressions, start here .] This example demonstrates how to use lambda expressions: To compare items in two lists and find which items in one list are not in the other. For example: {1, 2, 3}, {2, 3, 4...

Posted to Deborah's Developer MindScape by Deborah Kurata on Thu, Jul 2 2009
Filed under: Filed under: C#, .NET, CSharp, Lambda

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