Transient Fault Handling Application Block/Retry patterns for .NET Core / .NET Standard.

TransientFaultHandling.Core is retry library for transient error handling. It is ported from Microsoft Enterprise Library’s Transient Fault Handling Application Block, a library widely used with .NET Framework.

• The retry pattern APIs are ported to .NET Core/.NET Standard
• New functional and fluent APIs added easily implement retry logic
• The outdated configuration APIs are now up to date

With this library, the old code with retry logic based on Microsoft Enterprise Library can be ported to .NET Core/.NET Standard without modification:

ITransientErrorDetectionStrategy transientExceptionDetection = new MyDetection();
RetryStrategy retryStrategy = new FixedInterval(retryCount: 5, retryInterval: TimeSpan.FromSeconds(1));
RetryPolicy retryPolicy = new RetryPolicy(transientExceptionDetection, retryStrategy);
retryPolicy.ExecuteAction(() => webClient.DownloadString("https://DixinYan.com"));

With this library, it is extremely easy to detect transient exception and implement retry logic. For example, the following code downloads a string, if the exception thrown is transient (a WebException), it retries up to 5 times, with it waits for 1 second between each retry:

Retry.FixedInterval(
    () => webClient.DownloadString("https://DixinYan.com"),
    isTransient: exception => exception is WebException,
    retryCount: 5, retryInterval: TimeSpan.FromSeconds(1));

Fluent APIs are also provided for even better readability:

Retry
    .WithIncremental(retryCount: 5, initialInterval: TimeSpan.FromSeconds(1),
        increment: TimeSpan.FromSeconds(1))
    .Catch<OperationCanceledException>()
    .Catch<WebException>(exception =>
        exception.Response is HttpWebResponse response && response.StatusCode == HttpStatusCode.RequestTimeout)
    .ExecuteAction(() => webClient.DownloadString("https://DixinYan.com"));

It also supports JSON/XML/INI configuration:

{
  "retryStrategy": {
    "name1": {
      "fastFirstRetry": "true",
      "retryCount": 5,
      "retryInterval": "00:00:00.1"
    },
    "name2": {
      "fastFirstRetry": "true",
      "retryCount": 55,
      "initialInterval": "00:00:00.2",
      "increment": "00:00:00.3"
    }
  }
}

https://weblogs.asp.net/dixin/transientfaulthandling-core-retry-library-for-net-core-net-standard

https://github.com/Dixin/EnterpriseLibrary.TransientFaultHandling.Core (Partially ported from https://github.com/MicrosoftArchive/transient-fault-handling-application-block, with additional new APIs and redesigned/reimplemented APIs)

It can be installed through NuGet using .NET CLI:

dotnet add package EnterpriseLibrary.TransientFaultHandling.Core
dotnet add package TransientFaultHandling.Caching
dotnet add package TransientFaultHandling.Configuration
dotnet add package TransientFaultHandling.Data

Or in Visual Studio NuGet Package Manager Console:

Install-Package EnterpriseLibrary.TransientFaultHandling.Core
Install-Package TransientFaultHandling.Caching
Install-Package TransientFaultHandling.Configuration
Install-Package TransientFaultHandling.Data