Introduction A couple of years ago I did a post on the BackgroundWorker. While the BackgroundWorker class is a perfectly acceptable way to get operations done asynchronously in .Net/Mono, the Task Parallel Library is the newest and current recommended way of writing asynchronous code. So I thought I would do a sample application on the… Read More »
Recently I changed my web site over to being exclusively served via HTTPS (HTTP Secure). This post details the reasons for the change over from HTTP to HTTPS. Privacy (Confidentiality) When accessing a site via HTTPS, no information (except IP Address and Port Number of the web server) sent between client and server can be… Read More »
Introduction My job requires me to interface with a lot of embedded systems. Often times when communicating with those embedded systems a CRC check value will need to be calculated. A lot of the code I write is in C# and although there a few solutions out there for computing CRCs in .NET/Mono, the majority… Read More »
Encryption can be broken into either symmetric or asymmetric. Symmetric key cryptography is where the same cryptographic key is used for encryption and decryption. Asymmetric key (public-key) cryptography is where one key (the public key) is used for encryption and another key (the private key) is used for decryption. With the sort of added power… Read More »
Service Library Now that we have defined our service interface – It’s time to implement it. We implement the service contract interface (IMathService) just like we would any other C# interface and the result is our service library. See below for the service library source code:
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using System.ServiceModel; using MathServiceInterface; using MathServiceInterface.DTOs; using MathServiceInterface.Enumerations; using MathServiceInterface.Faults; namespace MathServiceLibrary { public class MathService : IMathService { public double PerformBinaryOperation(BinaryOperation binaryOperation) { double result = 0; switch (binaryOperation.Operation) { case BinaryOpEnum.Add: result = binaryOperation.Operand1 + binaryOperation.Operand2; break; case BinaryOpEnum.Subtract: result = binaryOperation.Operand1 - binaryOperation.Operand2; break; case BinaryOpEnum.Multiply: result = binaryOperation.Operand1 * binaryOperation.Operand2; break; case BinaryOpEnum.Divide: if (binaryOperation.Operand2 == 0) { throw new FaultException<BinaryOperationFault>( new BinaryOperationFault(binaryOperation.Operation, "Divide By Zero")); } result = binaryOperation.Operand1 / binaryOperation.Operand2; break; default: throw new FaultException<BinaryOperationFault>( new BinaryOperationFault(binaryOperation.Operation, "Undefined Operation Specified")); } if (double.IsNaN(result) || double.IsInfinity(result)) { throw new FaultException<BinaryOperationFault>( new BinaryOperationFault(binaryOperation.Operation, "Arithmetic Overflow")); } return result; } public double CalculateSlope(TwoDimensionalPoint point1, TwoDimensionalPoint point2) { if (point1.Equals(point2)) { throw new FaultException<SlopeCalculationFault>( new SlopeCalculationFault( "Two distinct points must be provided")); } double deltaY = point2.Y - point1.Y; double deltaX = point2.X - point1.X; if (deltaX == 0) { throw new FaultException<SlopeCalculationFault>( new SlopeCalculationFault("Undefined Slope")); } double slope = deltaY / deltaX; if (double.IsNaN(slope) || double.IsInfinity(slope)) { throw new FaultException<SlopeCalculationFault>( new SlopeCalculationFault( "Slope Calculation Resulted in Arithmetic Overflow")); } return slope; } } } |
Throwing a FaultException from the Service Library The… Read More »
Introduction LINQ (Language-Integrated Query) is a powerful tool of the .NET Framework. As the name implies, it integrates query capabilities directly into C# (or the .NET language of your choice). This article does not aim to be an introduction to LINQ, but rather how to use LINQ queries on non-generic collections (objects of IEnumerable type).… Read More »
Service Interface At the heart of this WCF solution is the Service Interface which describes the operations that our service supports. In addition, the service interface (contract) assembly also contains the DTOs and SOAP Faults that are to be exchanged over the wire. Personally, I like to organize this assembly by putting DTOs in a… Read More »
Compression then encryption or the other way around? Sometimes we need to compress a file in order to make it easier to transmit. Sometimes we need to encrypt the contents of a file in order to protect that information from prying eyes. Sometimes we need to apply both compression and encryption to a file. At… Read More »
Introduction Windows Communication Foundation (WCF) is a part of the .NET Framework which allows for rapidly building service-oriented applications. Personally, I believe the strongest aspect of WCF is the speed in which you can construct and deploy business applications which require a service oriented architecture (SOA) based solution. WCF is mainly for building SOAP-based web… Read More »
So I am brushing up on my Python skills because I want to improve upon my knowledge of scripting languages. I code in C# more often than not which is a statically typed language and I wish to expand my horizons by getting more serious about dynamically typed languages. One thing that I noticed while… Read More »