sshd config - Page 68 - Developer IT

A Generic, IDisposable WCF Service Client

- by Steve Wilkes

WCF clients need to be cleaned up properly, but as they're usually auto-generated they don't implement IDisposable. I've been doing a fair bit of WCF work recently, so I wrote a generic WCF client wrapper which effectively gives me a disposable service client. The ServiceClientWrapper is constructed using a WebServiceConfig instance, which contains a Binding, an EndPointAddress, and whether the client should ignore SSL certificate errors - pretty useful during testing! The Binding can be created based on configuration data or entirely programmatically - that's not the client's concern. Here's the service client code: using System; using System.Net; using System.Net.Security; using System.ServiceModel; public class ServiceClientWrapper<TService, TChannel> : IDisposable where TService : ClientBase<TChannel> where TChannel : class { private readonly WebServiceConfig _config; private TService _serviceClient; public ServiceClientWrapper(WebServiceConfig config) { this._config = config; } public TService CreateServiceClient() { this.DisposeExistingServiceClientIfRequired(); if (this._config.IgnoreSslErrors) { ServicePointManager.ServerCertificateValidationCallback = (obj, certificate, chain, errors) => true; } else { ServicePointManager.ServerCertificateValidationCallback = (obj, certificate, chain, errors) => errors == SslPolicyErrors.None; } this._serviceClient = (TService)Activator.CreateInstance( typeof(TService), this._config.Binding, this._config.Endpoint); if (this._config.ClientCertificate != null) { this._serviceClient.ClientCredentials.ClientCertificate.Certificate = this._config.ClientCertificate; } return this._serviceClient; } public void Dispose() { this.DisposeExistingServiceClientIfRequired(); } private void DisposeExistingServiceClientIfRequired() { if (this._serviceClient != null) { try { if (this._serviceClient.State == CommunicationState.Faulted) { this._serviceClient.Abort(); } else { this._serviceClient.Close(); } } catch { this._serviceClient.Abort(); } this._serviceClient = null; } } } A client for a particular service can then be created something like this: public class ManagementServiceClientWrapper : ServiceClientWrapper<ManagementServiceClient, IManagementService> { public ManagementServiceClientWrapper(WebServiceConfig config) : base(config) { } } ...where ManagementServiceClient is the auto-generated client class, and the IManagementService is the auto-generated WCF channel class - and used like this: using(var serviceClientWrapper = new ManagementServiceClientWrapper(config)) { serviceClientWrapper.CreateServiceClient().CallService(); } The underlying WCF client created by the CreateServiceClient() will be disposed after the using, and hey presto - a disposable WCF service client.

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