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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-4424] Add a BsonClassMap method that registers a class map only if it has not already been registered</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4424</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;The 3 RegisterClassMap methods in BsonClassMap are meant to only be called once for a given type. Normally we expect an application to know whether or not serialization has already been configured or not, but there are potential scenarios where conditional registration might be useful (such as multiple dependencies sharing some common data models where you don&apos;t have control over which dependency gets initialized first).&lt;/p&gt;

&lt;p&gt;It would be helpful to have a method that can be safely called without knowing in advance whether a class map for a given type has already been registered or not.&lt;/p&gt;

&lt;p&gt;This method could be something like:&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: #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; &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;void&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; RegisterClassMapIfNotRegistered&amp;lt;TClass&amp;gt;(Action&amp;lt;BconClassMap&amp;lt;TClass&amp;gt;&amp;gt; classMapInitializer)&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;A possible alternative is to use the `TryXyz` pattern:&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: #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; bool TryRegisterClassMap&amp;lt;TClass&amp;gt;(Action&amp;lt;BsonClassMap&amp;lt;TClass&amp;gt;&amp;gt; classMapInitializer, out BsonClassMap&amp;lt;TClass&amp;gt; classMap)&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 the question is whether the `bool` return value or the `out classMap` parameter add any usefulness.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2191536">CSHARP-4424</key>
            <summary>Add a BsonClassMap method that registers a class map only if it has not already been registered</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="9">Done</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="robert@mongodb.com">Robert Stam</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Nov 2022 00:31:49 +0000</created>
                <updated>Thu, 1 Dec 2022 23:02:57 +0000</updated>
                            <resolved>Thu, 1 Dec 2022 23:02:57 +0000</resolved>
                                                    <fixVersion>2.19.0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="5023942" author="xgen-internal-githook" created="Thu, 1 Dec 2022 23:02:26 +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-4424&quot; title=&quot;Add a BsonClassMap method that registers a class map only if it has not already been registered&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4424&quot;&gt;&lt;del&gt;CSHARP-4424&lt;/del&gt;&lt;/a&gt;: Added TryRegisterClassMap method to BsonClassMap.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/6a203a450f97af76bcba73ea0815170bf63aa2a8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/6a203a450f97af76bcba73ea0815170bf63aa2a8&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4999105" author="rstam" created="Tue, 22 Nov 2022 00:53:52 +0000"  >&lt;p&gt;Original user PR requesting this feature:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/pull/941&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/pull/941&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;A second PR with alternative `RegisterClassMapIfNotAlreadyRegistered` method:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/pull/948&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/pull/948&lt;/a&gt;&lt;/p&gt;</comment>
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