how to generate qr code in asp.net using c# dynamic in Noninterop Scenarios in Visual C#.NET

Encoder QR Code 2d barcode in Visual C#.NET dynamic in Noninterop Scenarios

dynamic in Noninterop Scenarios
Encode Quick Response Code In C#.NET
Using Barcode creator for Visual Studio .NET Control to generate, create QR-Code image in .NET framework applications.
www.OnBarcode.com
QR Code Scanner In Visual C#.NET
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
The main motivation behind dynamic s introduction was to make it possible to use Office without writing horrible code. It also has uses in other interop scenarios such as dealing with browser script in Silverlight, and working with dynamic languages. But would you ever use it in a pure C# scenario The dynamic style has become increasingly fashionable in recent years some popular JavaScript libraries designed for client-side web code make cunning use of dynamic idioms, as do certain web frameworks. Some developers even go as far as to claim that a dynamic style is inherently superior to a static style. If that s the way the wind is blowing, should C# developers follow this trend Tantalizingly, for those keen on dynamic languages, dynamic has brought some dynamic language features to C#. However, the key word here is some. C# 4.0 added dynamic to improve certain interop scenarios, not to support whole new programming idioms. It is therefore not helpful to think of dynamic in terms of dynamic extensions for C#. If you attempt to use C# as though it were a fully fledged dynamic language, you ll be stepping outside the language s core strength, so you will inevitably run into problems. We ve already seen a LINQ example that did not mix well with dynamic, and that failure
Barcode Creation In Visual C#
Using Barcode generation for Visual Studio .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
Create PDF 417 In Visual C#
Using Barcode maker for VS .NET Control to generate, create PDF-417 2d barcode image in VS .NET applications.
www.OnBarcode.com
According to popular legend, Brigadoon is a Scottish village which appears for only one day every 100 years.
Code-39 Printer In Visual C#.NET
Using Barcode maker for .NET framework Control to generate, create Code 39 Full ASCII image in .NET applications.
www.OnBarcode.com
Barcode Creator In C#.NET
Using Barcode generation for .NET framework Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
was a symptom of a broader problem. The underlying issue is that delegates are not as flexible as you might expect when it comes to dynamic behavior. Consider the method shown in Example 18-21.
2D Printer In Visual C#.NET
Using Barcode creator for Visual Studio .NET Control to generate, create 2D image in .NET applications.
www.OnBarcode.com
Printing Leitcode In C#.NET
Using Barcode creation for .NET framework Control to generate, create Leitcode image in .NET framework applications.
www.OnBarcode.com
static bool Test(int x) { return x < 100; }
Make QR-Code In .NET Framework
Using Barcode encoder for Reporting Service Control to generate, create Denso QR Bar Code image in Reporting Service applications.
www.OnBarcode.com
Create QR Code 2d Barcode In .NET Framework
Using Barcode generation for .NET framework Control to generate, create QR image in VS .NET applications.
www.OnBarcode.com
We can use this in conjunction with the LINQ Where operator, as Example 18-22 shows.
Barcode Decoder In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Encoding GTIN - 128 In Java
Using Barcode generator for Java Control to generate, create EAN / UCC - 14 image in Java applications.
www.OnBarcode.com
var nums = Enumerable.Range(1, 200); var filteredNumbers = nums.Where(Test);
UCC.EAN - 128 Creation In VS .NET
Using Barcode encoder for VS .NET Control to generate, create GTIN - 128 image in .NET framework applications.
www.OnBarcode.com
Barcode Generator In None
Using Barcode creation for Microsoft Word Control to generate, create Barcode image in Office Word applications.
www.OnBarcode.com
What if we wanted to make this more general-purpose We could modify Test so that instead of working only with int, it works with any built-in numeric type, or indeed any type that offers a version of the < operator that can be used with int. We could do that by changing the argument to dynamic, as Example 18-23 shows.
Generate 2D In Java
Using Barcode printer for Java Control to generate, create Matrix Barcode image in Java applications.
www.OnBarcode.com
Drawing Barcode In None
Using Barcode creator for Excel Control to generate, create Barcode image in Office Excel applications.
www.OnBarcode.com
static bool Test(dynamic x) { return x < 100; }
Encode UPC A In .NET
Using Barcode maker for Visual Studio .NET Control to generate, create UPCA image in VS .NET applications.
www.OnBarcode.com
Barcode Encoder In Objective-C
Using Barcode generator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Unfortunately, this change would cause the code in Example 18-22 to fail with a compiler error. It complains that there are no overloads that match delegate System.Func<int,bool>, which is the function type the Where method expects here. This is frustrating because our Test method is certainly capable of accepting an int and returning a bool, but despite this, we need to add our own wrapper. Example 18-24 does the job.
Barcode Printer In Objective-C
Using Barcode generator for iPad Control to generate, create Barcode image in iPad applications.
www.OnBarcode.com
Print USS-128 In Java
Using Barcode encoder for Eclipse BIRT Control to generate, create GS1 128 image in BIRT reports applications.
www.OnBarcode.com
var filteredNumbers = nums.Where(x => Test(x));
This is a little weird because it seems like it should mean exactly the same as the equivalent line in Example 18-22. We ve had to add some extra code just to keep the C# type system happy, and normally that s exactly the sort of thing the dynamic style is supposed to let you avoid. Part of the problem here is that we re trying to use LINQ, a thoroughly static-oriented API. But it turns out that there s a deeper problem here, which we can illustrate by trying to write our own dynamic-friendly version of Where. Example 18-25 will accept anything as its test argument. This DynamicWhere method will be happy as long as test can be invoked as a method that returns a bool (or something implicitly convertible to bool).
static IEnumerable<T> DynamicWhere<T>(IEnumerable<T> input, dynamic test) { foreach (T item in input) { if (test(item)) { yield return item; } } }
This compiles, and will behave as intended if you can manage to invoke it, but unfortunately it doesn t help. Example 18-26 tries to use this, and it will not compile.
Copyright © OnBarcode.com . All rights reserved.