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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[CSHARP-4691] Support GetType comparison in LINQ3</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4691</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;h4&gt;&lt;a name=&quot;Summary&quot;&gt;&lt;/a&gt;Summary&lt;/h4&gt;

&lt;p&gt;We recently updated the NuGet package to the latest version (2.20.0) and noticed that one query doesn&apos;t work anymore. After some investigation I read that LINQ3 is now enabled by default. When I change the configuration to use LINQ2, the query works fine.&lt;/p&gt;
&lt;h4&gt;&lt;a name=&quot;HowtoReproduce&quot;&gt;&lt;/a&gt;How to Reproduce&lt;/h4&gt;

&lt;p&gt;This is the query that works fine with LINQ2:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;public&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; async Task&amp;lt;IList&amp;lt;Activity&amp;gt;&amp;gt; GetActivitiesAsync&amp;lt;TActivityObject, TId&amp;gt;(TId objectId, CancellationToken cancellationToken = &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;default&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; &#160; where TActivityObject : ActivityObject&amp;lt;TId&amp;gt;&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; &#160; where TId : notnull, IEquatable&amp;lt;TId&amp;gt;, &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;new&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; &#160; &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;return&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; await _client.ActivityCollection&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; &#160; &#160; &#160; &#160; &#160; .Find(x =&amp;gt; x.Object != &lt;/span&gt;&lt;span style=&quot;color: #006699; font-weight: bold; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;null&lt;/span&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt; &amp;amp;&amp;amp; x.Object.GetType() == typeof(TActivityObject) &amp;amp;&amp;amp; ((TActivityObject)x.Object).Id.Equals(objectId))&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; &#160; &#160; &#160; &#160; &#160; .SortByDescending(x =&amp;gt; x.CreatedAt)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;&#160; &#160; &#160; &#160; &#160; &#160; .ToListAsync(cancellationToken);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;With LINQ3 we get this exception:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;MongoDB.Driver.Linq.ExpressionNotSupportedException : Expression not supported: x.Object.GetType()&lt;/tt&gt;&lt;/p&gt;

&lt;p&gt;I tried to use the &quot;&lt;em&gt;is&quot;&lt;/em&gt; operator instead, but it also works only with LINQ2. With LINQ3 I get this exception:&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;System.Reflection.AmbiguousMatchException : Ambiguous match found.&lt;/tt&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="2376941">CSHARP-4691</key>
            <summary>Support GetType comparison in LINQ3</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="bernd@guidnew.com">Bernd Hirschmann</reporter>
                        <labels>
                    </labels>
                <created>Mon, 26 Jun 2023 13:59:23 +0000</created>
                <updated>Sat, 28 Oct 2023 11:46:50 +0000</updated>
                            <resolved>Thu, 29 Jun 2023 21:15:22 +0000</resolved>
                                    <version>2.20.0</version>
                                    <fixVersion>2.21.0</fixVersion>
                                    <component>LINQ3</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="5535257" author="xgen-internal-githook" created="Thu, 29 Jun 2023 21:14:51 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;rstam&apos;, &apos;email&apos;: &apos;robert@robertstam.org&apos;, &apos;username&apos;: &apos;rstam&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4691&quot; title=&quot;Support GetType comparison in LINQ3&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4691&quot;&gt;&lt;del&gt;CSHARP-4691&lt;/del&gt;&lt;/a&gt;: Support GetType comparison in LINQ3.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/a24f1cdb44ed6093f666e0f3015f7d98b800a1ef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/a24f1cdb44ed6093f666e0f3015f7d98b800a1ef&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="5528721" author="JIRAUSER1274237" created="Tue, 27 Jun 2023 17:52:50 +0000"  >&lt;p&gt;Hi, great to hear that you were able to add the support for GetType. I will test both cases in our project as soon as a new version is available. If you have a pre-release version, I can test it if you want. If I still have an issue, I can provide a small sample project.&lt;/p&gt;</comment>
                            <comment id="5528590" author="rstam" created="Tue, 27 Jun 2023 17:24:06 +0000"  >&lt;p&gt;I have support for GetType comparison filters working in LINQ3.&lt;/p&gt;

&lt;p&gt;I did not encounter the issue you reported when using `is`. It mostly worked, though I did make a small fix to support `is` matching subclasses also.&lt;/p&gt;</comment>
                            <comment id="5528426" author="rstam" created="Tue, 27 Jun 2023 16:37:46 +0000"  >&lt;p&gt;In order to reproduce this I have assumed that `x.Object` is either of type `object` or of type `ActivityObject&amp;lt;int&amp;gt;`.&lt;/p&gt;

&lt;p&gt;The scenarios are slightly different so I am testing both.&lt;/p&gt;</comment>
                            <comment id="5526304" author="rstam" created="Mon, 26 Jun 2023 22:20:16 +0000"  >&lt;p&gt;I&apos;m trying to reproduce this but don&apos;t have quite enough information. For example, what is the compile time type of `x.Object`?&lt;/p&gt;

&lt;p&gt;Can you provide a small standalone console application reproducing the issue?&lt;/p&gt;</comment>
                            <comment id="5524652" author="dbeng-pm-bot" created="Mon, 26 Jun 2023 13:59:26 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bernd%40guidnew.com&quot; class=&quot;user-hover&quot; rel=&quot;bernd@guidnew.com&quot;&gt;bernd@guidnew.com&lt;/a&gt;, thank you for reporting this issue! The team will look into it and get back to you soon. &lt;/p&gt;</comment>
                    </comments>
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                            <customfieldvalue>&lt;p&gt;1.  What would you like to communicate to the user about this feature?&lt;br/&gt;
2.  Would you like the user to see examples of the syntax and/or executable code and its output?&lt;br/&gt;
3.  Which versions of the driver/connector does this apply to?&lt;/p&gt;</customfieldvalue>

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