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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-846] Take(1).SingleOrDefault() throws InvalidOperationException</title>
                <link>https://jira.mongodb.org/browse/CSHARP-846</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;The attached code throws an InvalidOperationException() - Sequence contains more than one element, but there is only one element due to the Take(1) ?&lt;/p&gt;

&lt;p&gt;I can easily work around this issue, but is this a bug or by design?&lt;/p&gt;

&lt;p&gt;var result = collection.AsQueryable().Where( m =&amp;gt; m.Name == &quot;Lisa&quot; ).Take( 1 ).SingleOrDefault(); // exception thrown here&lt;/p&gt;</description>
                <environment>Window 7 64 bit</environment>
        <key id="94801">CSHARP-846</key>
            <summary>Take(1).SingleOrDefault() throws InvalidOperationException</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="paul.bowden">Paul Bowden</reporter>
                        <labels>
                            <label>question</label>
                    </labels>
                <created>Fri, 18 Oct 2013 11:23:13 +0000</created>
                <updated>Fri, 5 Apr 2019 13:59:06 +0000</updated>
                            <resolved>Wed, 22 Apr 2015 15:28:27 +0000</resolved>
                                    <version>1.8.3</version>
                                    <fixVersion>2.1</fixVersion>
                                    <component>Linq</component>
                                        <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="895021" author="craiggwilson" created="Wed, 22 Apr 2015 15:28:27 +0000"  >&lt;p&gt;This has been fixed with &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-601&quot; title=&quot;Linq to Aggregation Framework&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-601&quot;&gt;&lt;del&gt;CSHARP-601&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="444691" author="rstam" created="Tue, 22 Oct 2013 17:04:35 +0000"  >&lt;p&gt;In case anyone is wondering what the easy workaround is, this is it:&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;   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;// replace&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;var result = collection.AsQueryable().Where( m =&amp;gt; m.Name == &quot;Lisa&quot; ).Take( 1 ).SingleOrDefault();&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;// with&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;var result = collection.AsQueryable().Where( m =&amp;gt; m.Name == &quot;Lisa&quot; ).FirstOrDefault()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</comment>
                            <comment id="442860" author="craiggwilson" created="Fri, 18 Oct 2013 12:17:32 +0000"  >&lt;p&gt;Interesting problem.  This is definitely a bug.  So, the issue is that to do Single() or SingleOrDefault(), we have to select 2 items in order to throw an exception if there is more than 1, just like Linq to Objects does.  Therefore, that Take(1) get&apos;s ignored.&lt;/p&gt;

&lt;p&gt;As you said, this should be trivial to work-around, but we&apos;ll get this fixed.  Thanks for the report.&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="32715" name="Program.cs" size="1238" author="paul.bowden" created="Fri, 18 Oct 2013 11:23:13 +0000"/>
                    </attachments>
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