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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-3865] ToUpperInvariant Not Supported</title>
                <link>https://jira.mongodb.org/browse/CSHARP-3865</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;The documentation states that ToUpperInvariant is supported but I am getting an error when using it.&lt;/p&gt;

&lt;p/&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="1877364">CSHARP-3865</key>
            <summary>ToUpperInvariant Not Supported</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="richard.collette@gmail.com">Richard Collette</reporter>
                        <labels>
                    </labels>
                <created>Fri, 17 Sep 2021 15:59:59 +0000</created>
                <updated>Sat, 28 Oct 2023 11:47:30 +0000</updated>
                            <resolved>Thu, 7 Oct 2021 17:27:49 +0000</resolved>
                                                    <fixVersion>2.14.0</fixVersion>
                                    <component>Linq</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4449390" author="rstam" created="Fri, 1 Apr 2022 01:28:23 +0000"  >&lt;p&gt;We now think it was a mistake to implement this.&lt;/p&gt;

&lt;p&gt;The implementation treats ToLowerInvariant and ToUpperInvariant as synonyms for ToLower and ToUpper, but that&apos;s not actually correct.&lt;/p&gt;

&lt;p&gt;The server has no support for doing culture-invariant to upper or lower case transformations, so it&apos;s a mistake to claim to support these methods.&lt;/p&gt;</comment>
                            <comment id="4110879" author="rstam" created="Thu, 7 Oct 2021 17:27:49 +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;
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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;   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;
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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;   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;
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		&lt;/tr&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-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;
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&lt;p/&gt;</comment>
                            <comment id="4110793" author="JIRAUSER1257862" created="Thu, 7 Oct 2021 16:55:59 +0000"  >&lt;p&gt;Thank you!&lt;/p&gt;</comment>
                            <comment id="4110734" author="xgen-internal-githook" created="Thu, 7 Oct 2021 16:39:57 +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-3865&quot; title=&quot;ToUpperInvariant Not Supported&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-3865&quot;&gt;&lt;del&gt;CSHARP-3865&lt;/del&gt;&lt;/a&gt;: LINQ3: Support ToLowerInvariant and ToUpperInvariant.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/5276c39b23804d17646c69310ec0825946c98a5c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/5276c39b23804d17646c69310ec0825946c98a5c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4078643" author="rstam" created="Wed, 22 Sep 2021 20:29:21 +0000"  >&lt;p&gt;With a few minor changes `ToLowerInvariant` and `ToUpperInvariant` now work in the new LINQ implementation.&lt;/p&gt;

&lt;p&gt;Also, it works in combination with either `==` or `Equals`.&lt;/p&gt;</comment>
                            <comment id="4074632" author="dmitry.lukyanov" created="Tue, 21 Sep 2021 15:41:59 +0000"  >&lt;p&gt;Hey &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=richard.collette%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;richard.collette@gmail.com&quot;&gt;richard.collette@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;thanks for your report, you&apos;re right that the c# &quot;equal&quot; operator works a bit different than the &quot;Equals&quot; method. Since there is a workaround with &quot;=&quot; operator, we&apos;re going to address this issue in the next LINQ implementation which is currently in code review.&lt;/p&gt;</comment>
                            <comment id="4069124" author="JIRAUSER1257862" created="Fri, 17 Sep 2021 17:49:21 +0000"  >&lt;p&gt;The same issue presents when using ToUpper().Equals() in a FindAsync operation.&#160; It works only if you do ToUpper() == .&lt;/p&gt;</comment>
                            <comment id="4068886" author="JIRAUSER1257862" created="Fri, 17 Sep 2021 16:04:20 +0000"  >&lt;p&gt;ToLowerInvariant does not work either.&#160; This may be specific to linq queries.&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;
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					&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; Product? GetProductByFriendlyName(string friendlyName)&lt;/span&gt;&lt;/pre&gt;
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					&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;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;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;/pre&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;   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;        (from product in _products.AsQueryable()&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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;   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;span style=&quot;color: #008200; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;// Note that .Equals(value,StringComparison) is not supported.&lt;/span&gt;&lt;/pre&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;   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;            where product.FriendlyName.ToUpper().Equals(friendlyName.ToUpper())&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;   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;            select product).SingleOrDefault();&lt;/span&gt;&lt;/pre&gt;
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					&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;
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&lt;/div&gt;
&lt;p/&gt;</comment>
                    </comments>
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            <issuekey id="2013819">CSHARP-4121</issuekey>
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