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    <p>Here's one way to do it:</p> <pre><code>if (System.Threading.Thread.CurrentThread.ManagedThreadId == ThreadB.ManagedThreadId) ... </code></pre> <p>I don't know enough about .NET's <code>Thread</code> class implementation to know if the comparison above is equivalent to <code>Equals()</code> or not, but in absence of this knowledge, comparing the IDs is a safe bet.</p> <p>There may be a better (where better = easier, faster, etc.) way to accomplish what you're trying to do, depending on a few things like:</p> <ul> <li>what kind of app (ASP.NET, WinForms, console, etc.) are you building?</li> <li>why do you want to enforce I/O on only one thread?</li> <li>what kind of I/O is this? (e.g. writes to one file? network I/O constrained to one socket? etc.)</li> <li>what are your performance constraints relative to cost of locking, number of concurrent worker threads, etc?</li> <li>whether the "else" clause in your code needs to be blocking, fire-and-forget, or something more sophisticated</li> <li>how you want to deal with timeouts, deadlocks, etc.</li> </ul> <p>Adding this info to your question would be helpful, although if yours is a WinForms app and you're talking about user-facing GUI I/O, you can skip the other questions since the scenario is obvious. </p> <p>Keep in mind that <code>// call performIO so that it is called (invoked?) on ThreadB</code> implementation will vary depending on whether this is WinForms, ASP.NET, console, etc. </p> <p>If WinForms, check out <a href="http://www.codeproject.com/KB/cs/AOPInvokeRequired.aspx" rel="nofollow noreferrer">this CodeProject post</a> for a cool way to handle it. Also see MSDN for how this is usually handled using <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.control.invokerequired.aspx" rel="nofollow noreferrer">InvokeRequired</a>. </p> <p>If Console or generalized server app (no GUI), you'll need to figure out how to let the main thread know that it has work waiting-- and you may want to consider an alternate implementation which has a I/O worker thread or thread pool which just sits around executing queued I/O requests that you queue to it. Or you might want to consider synchronizing your I/O requests (easier) instead of marshalling calls over to one thread (harder).</p> <p>If ASP.NET, you're probably implementing this in the wrong way. It's usually more effective to use ASP.NET async pages and/or to (per above) synchronize snchronizing to your I/O using <code>lock{}</code> or another synchronization method. </p>
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    1. POHow can I check if a function is being called on a particular Thread?
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    1. USJustin Grant
    1. USJustin Grant
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    1. POHow can I check if a function is being called on a particular Thread?
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    1. COI imagine comparing just the ID is a lot more efficient then comparing the whole object! Im also looking at ways in which I can force performIO to be called on ThreadB rather than the current Thread. Any Ideas?
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      1. USTK.
    2. COTake a look at my updated answer above-- does that address what you're trying to do?
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      1. USJustin Grant
    3. COTK, comparing the Id is _not_ more efficient than comparing 2 objects, but it is more reliable here.
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      1. USHenk Holterman
 

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