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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>
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<item>
            <title>[CSHARP-1519] Using GetType in Group throws instead of translating to _t</title>
                <link>https://jira.mongodb.org/browse/CSHARP-1519</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;There&apos;s no to use Group (and probably other aggregations) with anonymous types to generate a projection for the discriminator (i.e. _t).&lt;/p&gt;

&lt;p&gt;For example this works:&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;
		&lt;tbody &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-top: 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;collection.Aggregate.Group(x =&amp;gt; new { Name = x.Name }, g =&amp;gt; new { Count = g.Count() }&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;But grouping on the document type:&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;
		&lt;tbody &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-top: 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;collection.Aggregate.Group(x =&amp;gt; new { Type = x.GetType }, g =&amp;gt; new { Count = g.Count() }&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;throws an exception with the following message:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;GetType of type System.Object is not supported in the expression tree document.GetType()&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="245136">CSHARP-1519</key>
            <summary>Using GetType in Group throws instead of translating to _t</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="I3arnon">Bar Arnon</reporter>
                        <labels>
                    </labels>
                <created>Mon, 28 Dec 2015 16:03:25 +0000</created>
                <updated>Thu, 3 Dec 2020 17:18:57 +0000</updated>
                            <resolved>Thu, 3 Dec 2020 17:18:57 +0000</resolved>
                                    <version>2.2</version>
                                                    <component>Linq</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3514632" author="jeff.yemin" created="Thu, 3 Dec 2020 17:18:57 +0000"  >&lt;p&gt;Closing as Won&apos;t Fix, but can re-open if there is still interest.&lt;/p&gt;</comment>
                            <comment id="1126340" author="craiggwilson" created="Tue, 5 Jan 2016 14:46:24 +0000"  >&lt;p&gt;Hi Bar,&lt;/p&gt;

&lt;p&gt;Thanks for the report. I spent a little time looking at this today and it will be surprisingly difficult to make this work right. I&apos;m going to move this into the Planned but not Scheduled bucket and come back to it.&lt;/p&gt;

&lt;p&gt;Craig&lt;/p&gt;</comment>
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