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    <p>There is definitely a bug. I just spent hours debugging the MVC 4 source code for the same problem. The primary root cause it that you have a collection whose name is the beginning of another property name. In your example: pl and pl-odd-value. </p> <p>If you play around some more, you may find that sometimes it works properly. The reason for it seeming to be random is that the model binder performs a binary search to locate the value to bind. The binary search uses a "divide and conquer" approach to finding the property in a sorted list of the properties that were posted. If the search tests the p1-odd-value in its divide and conquer, the problem occurs. If the search skips this value, no problem.</p> <p>This problem is most repeatable when you simply have the pl collection with 1 element and the pl-odd-value property in the object. </p> <p>Here is a bit more info related to this. There is a sortedList of all of the values posted back. In the case of your failed test, the sorted list looks like this:</p> <pre><code>alc, "false", al[0], "386" al[1], "710" pl-odd-value, "false" pl[0], "9530" pl[1], "211" pl[2], "783" </code></pre> <p>Notice that the sort order uses StringComparer.OrdinalIgnoreCase, which places the square bracket items AFTER the text-only item. When MVC is performing its binary search for the al or pl collection, it is searching for al or pl, NOT al[ or pl[. By searching for the collection name without a square bracket, al &lt; alc, not greater than alc. Problem is that we want to look after alc or pl-odd-value to get to the collection. </p> <p>The workaround is to make sure that none of your property names start with the name of any of your collection property names. Rename your al collection to maybe al_collection and your pl collection to maybe pl_collection.</p>
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    1. USGlenn Johnson
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