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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-3425] x =&gt; x.ToLower().Equals(&quot;firstname&quot;) throws NotSupportedException</title>
                <link>https://jira.mongodb.org/browse/CSHARP-3425</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;Hello,&lt;/p&gt;

&lt;p&gt;&lt;b&gt;AS-IS :&lt;/b&gt;&lt;br/&gt;
When i&apos;m trying to execute the following LINQ request&#160;&lt;tt&gt;x =&amp;gt; x.ToLower().Equals(&quot;firstname&quot;)&lt;/tt&gt;, the following exception is thrown:&#160;&lt;tt&gt;toLower is not supported&lt;/tt&gt;, i&apos;m using the version &apos;2.11.6&apos;.&lt;br/&gt;
I need this feature to perform &quot;case insensitive&quot; search.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;TO-BE:&lt;/b&gt;&lt;br/&gt;
I made some modifications in the pull request to support this feature :&#160;&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/pull/440&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/pull/440&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1623377">CSHARP-3425</key>
            <summary>x =&gt; x.ToLower().Equals(&quot;firstname&quot;) throws NotSupportedException</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="habarthierry@gmail.com">Thierry Habart</reporter>
                        <labels>
                    </labels>
                <created>Sun, 14 Feb 2021 11:32:53 +0000</created>
                <updated>Sat, 28 Oct 2023 11:47:57 +0000</updated>
                            <resolved>Mon, 25 Oct 2021 15:53:14 +0000</resolved>
                                    <version>2.11.6</version>
                                    <fixVersion>2.14.0</fixVersion>
                                    <component>LINQ3</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4145703" author="rstam" created="Mon, 25 Oct 2021 15:53:14 +0000"  >&lt;p&gt;This issue has been fixed in the new LINQ provider (known as LINQ3) which will be included in the upcoming 2.14 release.&lt;/p&gt;

&lt;p&gt;Configure your &lt;tt&gt;MongoClientSettings&lt;/tt&gt; to use &lt;tt&gt;LinqProvider.V3&lt;/tt&gt; if you want to use this functionality.&lt;/p&gt;

&lt;p&gt;To configure a client to use the LINQ3 provider use code like the following&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;var connectionString = &quot;mongodb://localhost&quot;;&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 clientSettings = MongoClientSettings.FromConnectionString(connectionString);&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;clientSettings.LinqProvider = LinqProvider.V3;&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 client = new MongoClient(clientSettings);&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="4145698" author="xgen-internal-githook" created="Mon, 25 Oct 2021 15:52:10 +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-3425&quot; title=&quot;x =&amp;gt; x.ToLower().Equals(&amp;quot;firstname&amp;quot;) throws NotSupportedException&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-3425&quot;&gt;&lt;del&gt;CSHARP-3425&lt;/del&gt;&lt;/a&gt;: Verify that these LINQ queries work in LINQ3.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/84399a18249028181c9ebbdb78a9e161bc91ac70&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/84399a18249028181c9ebbdb78a9e161bc91ac70&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="3618460" author="james.kovacs" created="Wed, 17 Feb 2021 00:31:14 +0000"  >&lt;p&gt;Hi, Thierry,&lt;/p&gt;

&lt;p&gt;Thank you for filing this JIRA ticket and your related PR. We are reviewing your PR and will get back to you shortly with feedback.&lt;/p&gt;

&lt;p&gt;Sincerely,&lt;br/&gt;
James&lt;/p&gt;</comment>
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