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(C# UWP/WinRT) Azure Service Bus - Unlock Message

See more Azure Service Bus Examples

Shows how to unlock a message for processing by other receivers on a specified queue or subscription. This operation deletes the lock object, causing the message to be unlocked.

For more information, see https://docs.microsoft.com/en-us/rest/api/servicebus/unlock-message

Chilkat Universal Windows Platform (UWP) / WinRT Downloads

Chilkat for the Universal Windows Platform (UWP)

// Note: Requires Chilkat v9.5.0.65 or greater.

// This requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// Make the initial connection.
// A single REST object, once connected, can be used for many Azure Service Bus REST API calls.
// The auto-reconnect indicates that if the already-established HTTPS connection is closed,
// then it will be automatically re-established as needed.
Chilkat.Rest rest = new Chilkat.Rest();
bool bAutoReconnect = true;
bool success = await rest.ConnectAsync("<yournamespace>.servicebus.windows.net",443,true,bAutoReconnect);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

// Let's load a previously computed SAS token and use it.
// See Azure Shared Access Signature for an example to genenerate an Azure SAS token.
Chilkat.StringBuilder sbToken = new Chilkat.StringBuilder();
sbToken.LoadFile("qa_data/tokens/serviceBusSas.txt","utf-8");

// Tell the REST object to use the Azure Shared Access Signature for authorization.
sbToken.Prepend("SharedAccessSignature ");
rest.AddHeader("Authorization",sbToken.GetAsString());

// ----------------------------------------------------------------------------------------------
// The code above this comment could be placed inside a function/subroutine within the application
// because the connection does not need to be made for every request.  Once the connection is made
// the app may send many requests..
// ----------------------------------------------------------------------------------------------

// To unlock a message, we'll need either the SequenceNumber or MessageId.
// When the message was locked, the SequenceNumber and MessageId of the locked message
// was returned in the HTTP response header named "BrokerProperties, which contained
// JSON such as the following:

// 	{
// 	  "DeliveryCount": 2,
// 	  "EnqueuedSequenceNumber": 3000003,
// 	  "EnqueuedTimeUtc": "Wed, 07 Dec 2016 17:42:48 GMT",
// 	  "Label": "M2",
// 	  "LockToken": "0a13ee8a-be32-4458-89e0-5e1401caa6a0",
// 	  "LockedUntilUtc": "Wed, 07 Dec 2016 18:13:12 GMT",
// 	  "MessageId": "7bea513a6ddb49089e07bfbee26d85bd",
// 	  "SequenceNumber": 3,
// 	  "State": "Active",
// 	  "TimeToLive": 922337203685.47754
// 	}

// The path for unlocking a message is constructed as follows, depending on
// whether it is a message on a queue or subscription:
// 
// (for a queue)
// /{queuePath}/messages/{messageId|sequenceNumber}/{lockToken}
// 
// (for a subscription)
// /{topicPath}/subscriptions/{subscriptionName}/messages/{messageId|sequenceNumber}/{lockToken}

// This example will build a path to unlock a message contained in a subscription.
string topicName = "gilaMonster";
string subscriptionName = "feedings";
string messageId = "7bea513a6ddb49089e07bfbee26d85bd";
string lockToken = "0a13ee8a-be32-4458-89e0-5e1401caa6a0";

// Build the path..
Chilkat.StringBuilder sbPath = new Chilkat.StringBuilder();
sbPath.Append("/{topicPath}/subscriptions/{subscriptionName}/messages/{messageId|sequenceNumber}/{lockToken}");
int numReplaced = sbPath.Replace("{topicPath}",topicName);
numReplaced = sbPath.Replace("{subscriptionName}",subscriptionName);
numReplaced = sbPath.Replace("{messageId|sequenceNumber}",messageId);
numReplaced = sbPath.Replace("{lockToken}",lockToken);

// Add a timeout parameter.
rest.AddQueryParam("timeout","20");

// Use the PUT HTTP verb to unlock the message.
Chilkat.StringBuilder sbResponseBody = new Chilkat.StringBuilder();
success = await rest.FullRequestNoBodySbAsync("PUT",sbPath.GetAsString(),sbResponseBody);
if (success != true) {
    Debug.WriteLine(rest.LastErrorText);
    return;
}

Debug.WriteLine("Response Status Code = " + Convert.ToString(rest.ResponseStatusCode));

// Check for a success response.
if (rest.ResponseStatusCode != 200) {
    Debug.WriteLine(rest.LastRequestStartLine);
    Debug.WriteLine(rest.LastRequestHeader);
    Debug.WriteLine(sbResponseBody.GetAsString());
    Debug.WriteLine("Failed.");
    return;
}

// If successful, the response body would be empty..
Debug.WriteLine("Success.");

 

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