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13951349
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2012-12-19T11:25:41.690
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2012-12-19T11:25:41.690
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OK, this one really confused me but I think I've got it figured out. The problem I had getting the <code>MultiSelectList</code> to display with defaults selected was that I was using <code>@Html.DropDownListFor(...)</code> to display the multi select list instead of <code>@Html.ListBoxFor(...)</code>. Confusingly, <code>DropDownListFor</code> will display a multi select list if you specify the HTML attributes to force it to do so, but the default values will not work, because it's only intended to have one default - the following will therefore not have any defaults selected: <pre><code>List<string> myStrings; myStrings = new List<string>(); myStrings.Add("aaa"); myStrings.Add("bbb"); myStrings.Add("ccc"); ViewData["MyStringsDropdown"] = new MultiSelectList( myStrings.Select(abc => new { StringId = abc, Title = abc + "Title" }), "StringId", "Title", myStrings.Where(str => str == "aaa" || str == "ccc").ToList() ); ... @Html.DropDownListFor(model => model.MyStrings, (MultiSelectList)ViewData["MyStringsDropdown"], new { size = "10", multiple = "multiple" }) </code></pre> However, the following will display the defaults of "aaa" and "ccc" as selected: <pre><code>@Html.ListBoxFor(model => model.MyStrings, (MultiSelectList)ViewData["MyStringsDropdown"], new { size = "10", multiple = "multiple" }) </code></pre> But here's the real kicker; ASP.NET sometimes seems cache the type of the control, so you can replace the <code>DropDownListFor</code> with the <code>ListBoxFor</code> and it will still not pre-select any defaults until you restart the IIS worker process. I find that really strange, and it threw me for a while.
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