CSOM: How to know if a Web has completed its creation?

Question

I have a service that creates a Sharepoint Online site using CSOM.

context.Web.Webs.Add(webCreationInformation);
context.ExecuteQuery();

This site is created using a defined Template stored in the solutions of the Site Collection. However, the creation of the site can take its time: from 5 minutes to 20 minutes for the site to be ready (all lists created, all views, etc.) Since my ExecuteQuery always returns at 5 minutes (generally with a 503 error) it is impossible for me to know when the site has finished the creation process.

Is there a way to know when the site is available?

I have tried loading the Web object, and even if its not ready, I can load it without problems:

Web sourceWeb = context.Site.OpenWeb(webRelativeUrl);
context.Load(sourceWeb);
context.ExecuteQuery(); 
//this returns the Web even if the site has not finished the creation process

I would like to have something like:

While(!web.IsReady)
{
  Thread.Sleep(60000); //60 seconds
  context.Load(web, w => w.IsReady);
  context.ExecuteQuery();
}

However, I can't seem to find any flag or value that can help me for this.

Thank you.

Answer 1

Try using ExecuteQueryAsync(), it permits a success and failure handler

ExecuteQueryAsync(successHandler(),failureHandler())

Example:

context.ExecuteQueryAsync(
        function() {
          alert("Success!");
        }, 
        function() {
          alert(“Failure.");
        }
);

Documentation also See Here

Answer 2

Here is how I did my pooling to check if the site is complete :

var tenant = new Tenant(ctx);

var siteCreationProperties = new SiteCreationProperties();

// Create the site collection
var spo = tenant.CreateSite(siteCreationProperties);

// We will need the IsComplete property to check if the provisioning of the Site Collection is complete.
ctx.Load(spo, i => i.IsComplete);
await ctx.ExecuteQueryAsync();

// Check if provisioning of the SiteCollection is complete.
while (!spo.IsComplete)
{
   // Wait for 3 seconds and then try again
   logger.LogInformation($"Pooling creation site: {input.SiteUrl}");

   await Task.Delay(3000);
   spo.RefreshLoad();
   await ctx.ExecuteQueryAsync();
}

The object Tenant is described there: Microsoft.Online.SharePoint.TenantAdministration.Tenant