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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-1932] Issue with nullable parameter</title>
                <link>https://jira.mongodb.org/browse/CSHARP-1932</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;We are experiencing a null reference exception when attempting to build a filter using a nullable parameter, even though the value is not null.&lt;/p&gt;

&lt;p&gt;I have attached a sample file to illustrate the error, if you attempt to use a nullable enumeration as a Type in a LINQ filter you get a null reference exception. I&apos;m aware the type on the serialised class (User) is not nullable, but the nullable parameter is used to distinguish whether a filter is needed or not.&lt;/p&gt;

&lt;p&gt;We have isolated this down to the upgrade between 2.4.1 and 2.4.2.&lt;/p&gt;</description>
                <environment></environment>
        <key id="361568">CSHARP-1932</key>
            <summary>Issue with nullable parameter</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="rob.offer@footy.com">Rob Offer</reporter>
                        <labels>
                    </labels>
                <created>Mon, 6 Mar 2017 11:14:45 +0000</created>
                <updated>Mon, 1 May 2017 22:23:29 +0000</updated>
                            <resolved>Mon, 6 Mar 2017 15:09:18 +0000</resolved>
                                    <version>2.4.2</version>
                                    <fixVersion>2.4.3</fixVersion>
                                    <component>Linq</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="1516630" author="rstam" created="Mon, 6 Mar 2017 15:07:48 +0000"  >&lt;p&gt;I can reproduce this. It is essentially the same issue as &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-1919&quot; title=&quot;Filter builder Where method with nullable Enum value doesn&amp;#39;t render correctly&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-1919&quot;&gt;&lt;del&gt;CSHARP-1919&lt;/del&gt;&lt;/a&gt; and has been fixed for 2.4.3.&lt;/p&gt;

&lt;p&gt;A work around is to use &lt;tt&gt;.Value&lt;/tt&gt; to convert the nullable value to a non-nullable value:&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;if (userType != null)&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;    filter = Builders&amp;lt;User&amp;gt;.Filter.Where(u =&amp;gt; u.UserType == userType.Value);&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>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
                                            <outwardlinks description="duplicates">
                                        <issuelink>
            <issuekey id="353519">CSHARP-1919</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
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                <attachments>
                            <attachment id="150791" name="Program.cs" size="1243" author="rob.offer@footy.com" created="Mon, 6 Mar 2017 11:11:05 +0000"/>
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