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    <p>Internally, <code>REG_MULTI_SZ</code> (<code>Type="multiString"</code>) values are represented by a sequence of null-terminated strings, terminated by an empty string.</p> <p>While <a href="http://msdn.microsoft.com/en-us/library/ms724884.aspx" rel="nofollow">this MSDN page</a> clearly states that <em>it is not possible to include a zero-length string in the sequence</em>, tools like WiX do allow for writing empty strings to the registry. Registry Editor, while displaying such values properly in some places, will remove empty strings before saving.</p> <p>So your example</p> <pre><code>&lt;RegistryValue Type="multiString" Name="polling_manifest" Value="" /&gt; </code></pre> <p>which can also be written as follows to make its intention more clear</p> <pre><code>&lt;RegistryValue Type="multiString" Name="polling_manifest"&gt; &lt;MultiStringValue&gt;&lt;/MultiStringValue&gt; &lt;/RegistryValue&gt; </code></pre> <p>will be written to the registry as an empty string, followed by a \0 character, followed by the sequence-terminating \0 character. With each character represented by two bytes, the entire sequence is exported as <code>"polling_manifest"=hex(7):00,00,00,00</code>.</p> <p>While testing this, I found that .NET, at least in version 4, doesn't use c-style string processing for reading <code>REG_MULTI_SZ</code> values, and can clearly process empty strings. Using code like yours clearly returned a string array containing one empty string element.</p> <p>I noticed you're using the 64-bit registry view in your code, however it is unclear whether your value will be written to this registry view. Furthermore key path and value name are read from configuration; are you sure they are correct?</p>
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    1. POWiX RegistryValue setting to null (Value="")
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    1. USThomas Gerstendörfer
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    1. COHi Thomas, Re: registry view. Yes, the app is a 32-bit app that maintains a part of the registry on both 32-bit and 64-bit systems which are also accessed by a non-Windows platform solution, so to keep things in one location, regardless of Windows OS Architecture, we went with the one view (HKLM\Software\Company\...).
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    2. CO...Enter key....sorry. The key path and value name are good as updates occur just fine. In my code I do not get a string array containing one empty string. I get a string[] that is null. Any references to that object results in a NullReferenceException.
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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