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POWhy is Visual Studio 2010 telling me "'System.Delegate' does not contain a definition for 'EndInvoke'"?
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copied!<p>Why is Visual Studio 2010 telling me "'System.Delegate' does not contain a definition for 'EndInvoke'" when I call <code>job.Delegate.EndInvoke()</code>? How do I fix it? Note that it likes <code>BeginInvoke()</code> just fine, and doesn't complain if I add <code>EndInvoke()</code> immediately after <code>BeginInvoke()</code> (thought hat doesn't accomplish what I want).</p> <p>I have a little JobTracker class for tracking backup jobs:</p> <pre><code>public class JobTracker { private class Job { public Account Account { get; set; } public IAsyncResult Result { get; set; } public Delegate Delegate { get; set; } public bool IsCompleted { get { return result.IsCompleted } } public string Instance { get { return Account.Instance } } } public List<Job> Running = new List<Job>; public void AddJob(Account a, IAsyncResult result, Delegate del) { var j = new Job { Account = a, Result = result, Delegate = del }; Running.Add(j); } public void RemoveJob(Job job) { Running.Remove(job); } public bool IsInstanceRunning(string instance) { return (Running.Count(x => x.Instance == instance) > 0); } } </code></pre> <p>These backup jobs will happen asynchronously via BeginInvoke()/EndInvoke(). The calling code (simplified) looks something like this:</p> <pre><code>public void BackupAccounts(IEnumerable<Account> accounts, int maxconcurrent = 4) { // local copy List<Accounts> myaccounts = accounts.ToList(); var jobs = new JobTracker(); while (myaccounts.Count > 0) { // check our running jobs foreach (var job in jobs.Running) { if (job.IsCompleted) { // PROBLEM LINE: job.Delegate.EndInvoke(); jobs.RemoveJob(job); } } // more jobs! while (jobs.Count < maxconcurrent) { int i = 0; Account account = null; // choose the next account on a free instance while (int < accounts.Count) { account = accounts[i]; // instance in use? if (jobs.InstanceIsRunning(account.Instance)) { i += 1; continue; } else { // start the job accounts.RemoveAt(i); BackupDelegate del = new BackupDelegate(BackupAccount, account); IAsyncResult result = del.BeginInvoke(); jobs.AddJob(account, result, del); } } } // we're all full up, give it some time to work Thread.Sleep(2000); } } </code></pre> <p>PS - I know this code can be greatly simplified. It's a first, get-it-working iteration -- I just can't figure out why VS doesn't like it. </p>

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