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class MainForm : Form { public MainForm() { // Handle the MouseMove event using standard C# event syntax. this.MouseMove += new MouseEventHandler(MainForm_MouseMove); } void MainForm_MouseMove(object sender, MouseEventArgs e) { // Do something with the mouse data. } } However, many methods in the .NET base class libraries define methods that require delegate types as parameters. When you make use of traditional delegate syntax, the code can be on the clunky side. For example, consider the FindAll() method of the generic List<T> type. This method is expecting a generic delegate of type System.Predicate<T>, which is used to wrap any method returning a Boolean and taking a specified T as the only input parameter: class Program { static void Main(string[] args) { // Make a list of integers using C# 3.0 // collection initialization syntax. List<int> list = new List<int>() {20, 1, 4, 8, 9, 44}; // Call FindAll() using traditional delegate syntax. Predicate<int> callback = new Predicate<int>(CallMeHere); List<int> evenNumbers = list.FindAll(callback); foreach (int evenNumber in evenNumbers) { Console.WriteLine(evenNumber); } Console.ReadLine(); } // Is it an even number static bool CallMeHere(int i) { return (i % 2) == 0; } } Here, we have a method (CallMeHere) that is in charge of testing the incoming integer parameter to see if it is even or odd, via the C# modulo operator, %. While the code compiles as expected, this method is invoked only under very limited circumstances; specifically, when we call FindAll(), which leaves us with the baggage of a full method definition. If we were to instead use an anonymous method, our code cleans up considerably: static void Main(string[] args) { // Make a list of integers using C# 3.0 // collection initialization syntax. List<int> list = new List<int>() {20, 1, 4, 8, 9, 44}; vb.net barcode scanner programming .NET Barcode Scanner Online VB.NET Code Example - CnetSDK.com
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NET Code 93 Barcode Reader - read and scan Code 93 . and unzip 2. ... source code snippets to see how to scan and decode barcode from web camera (C# . // Now, use an anonymous method List<int> evenNumbers = listFindAll(delegate(int i) { return (i % 2) == 0; } ); foreach (int evenNumber in evenNumbers) { ConsoleWriteLine(evenNumber); } ConsoleReadLine(); } In this case, rather than directly creating a Predicate<T> delegate type and then authoring a stand-alone method, we are able to supply an anonymous method While this is a step in the right direction, we are still required to use the delegate keyword (or a strongly typed Predicate<T>), and we must ensure that the parameter list is a dead-on match Also, as you may agree, the syntax used to define an anonymous method can still be viewed as being somewhat clunky, which is even more apparent here: List<int> evenNumbers = listFindAll( delegate(int i) { return (i % 2) == 0; } ); We can use lambda expressions to further simplify our call to FindAll(). crystal reports ean 128, pdf417 excel free, qr code excel free, create barcode in excel 2016, excel gtin barcode, asp.net ean 13 reader vb.net barcode reader source code Barcode Reader App for .NET | C# & VB . NET Class Demos for Aztec ...
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How can I get the data sent from a USB bar code scanner to a text box in Viusal Basic 6. One thing also is that the VB6 application may not be the main window ... When we make use of this new syntax, there is no trace whatsoever of the underlying delegate Consider the following update to the same code base: static void Main(string[] args) { // Make a list of integers using C# 30 // collection initialization syntax List<int> list = new List<int>() {20, 1, 4, 8, 9, 44}; // Now, use a C# 30 lambda expression List<int> evenNumbers = listFindAll(i => (i % 2) == 0); foreach (int evenNumber in evenNumbers) { ConsoleWriteLine(evenNumber); } ConsoleReadLine(); } If we want to simplify this code base even further, we could make use of type inference with the var keyword As it turns out, this keyword is quite handy when working with lambda expressions, given that they can typically return various value types. vb.net barcode reader source code VB.NET Barcode Reader & Scanner for VB.NET Tutorial | Reading ...
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