WindowsAzure.Storage v2 StorageException

Question

I'm migrating from WindowsAzure.StorageClient 1.7 to WindowsAzure.Storage 2.0, and I'm working right now on the management of the exceptions. Following this guide and other sources, I found out I had to migrate from

try
{
    // Something
}
catch (StorageClientException e)
{
    switch (e.ErrorCode)
    {
        case StorageErrorCode.ContainerNotFound:
        case StorageErrorCode.ResourceNotFound:
        case StorageErrorCode.BlobNotFound:
        case StorageErrorCode.ConditionFailed:
            // Do something
    }
}

to

try
{
    // Something
}
catch (StorageException e)
{
    switch (e.RequestInformation.ExtendedErrorInformation.ErrorCode)
    {
        case StorageErrorCodeStrings.ContainerNotFound:
        case StorageErrorCodeStrings.ResourceNotFound:
        case BlobErrorCodeStrings.BlobNotFound:
        case StorageErrorCodeStrings.ConditionNotMet:
            // Do something
    }
}

Looks simple. The problem is ExtendedErrorInformation is always equal to null. The HttpStatusMessage instead says 'The specified blob does not exist.', as it should.

I thought it was caused by the simulator of the test environment, but trying it in a real Azure environment drived me to the same situation.

Any idea?

Answer 1

Another option is to look at the RequestInformation.HttpStatusCode instead. This seems to be more reliable anyway. Your code translates rather easily to:

try
{
    // Something
}
catch (StorageException e)
{
    switch (e.RequestInformation.HttpStatusCode)
    {
        case (int)HttpStatusCode.NotFound:
        case (int)HttpStatusCode.PreconditionFailed:
        // Do something
    }
}