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Sorry, it doesn't compile.<br />
'There is no implicit conversion between 'string' and 'System.Collections.Generi<wbr />c.IEnumera<wbr />ble&lt;System<wbr />.Xml.Linq.<wbr />XElement&gt;'<wbr />
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Sorry, it doesn't compile.
'There is no implicit conversion between 'string' and 'System.Collections.Generic.IEnumerable<System.Xml.Linq.XElement>'

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<div class="content wysiwyg-content">
Hi experts<br />
I am new to LINQ-XML, I wonder how to fix this expression. Thanks in advance,<br />
<br />
There is an exception since 'tgSetting.TgIDs' can be 'null'.<br />
var e = from tgSetting in tgSettings<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; select new XElement(&quot;Tg&quot;, new XAttribute(&quot;Name&quot;, tgSetting.TgListName),<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new XElement(&quot;Tgrp&quot;,from tgID in tgSetting.TgIDs<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;where tgID != null<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;select new XElement(&quot;Tg&quot;, new XAttribute(&quot;Number&quot;, tgID.ToString()))));<br />
<br />
What I would like to have is if it is 'null', then output the following:<br />
&lt;Tg Name=&quot;gp 0&quot;&gt;<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;Tgrp&gt;<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&lt;/Tgrp&gt;<br />
&lt;/Tg&gt;
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Hi experts
I am new to LINQ-XML, I wonder how to fix this expression. Thanks in advance,

There is an exception since 'tgSetting.TgIDs' can be 'null'.
var e = from tgSetting in tgSettings
            select new XElement("Tg", new XAttribute("Name", tgSetting.TgListName),
                      new XElement("Tgrp",from tgID in tgSetting.TgIDs
                                                         where tgID != null
                                                         select new XElement("Tg", new XAttribute("Number", tgID.ToString()))));

What I would like to have is if it is 'null', then output the following:
<Tg Name="gp 0">
         <Tgrp>
         </Tgrp>
</Tg>

how to fix this LINQ-XML expression

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