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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-1066] Change BsonElement from a class to a struct</title>
                <link>https://jira.mongodb.org/browse/CSHARP-1066</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;If BsonElement were a struct instead of a class then BsonDocument could use less memory (fewer heap objects). BsonDocument stores the elements in a List:&lt;/p&gt;

&lt;p/&gt;
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					&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;private List&amp;lt;BsonElement&amp;gt; _elements;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;

&lt;p&gt;Currently, BsonElement is a class, so a document with N elements uses N + 1 heap objects for the elements (1 for the List and one for each element). If BsonElement were a struct it would use only 1 heap object (for the List), because as a struct the memory for all the elements would be internal to the List (true for all Lists of structs).&lt;/p&gt;

&lt;p&gt;This change is potentially backward breaking for anyone who has written code that uses elements directly. In particular, as a struct we would want the BsonElement class to be immutable, which means we would remove the ability to change the value of an existing element.&lt;/p&gt;

&lt;p&gt;We would appreciate comments from our users letting us know if this small breaking change would affect you or not.&lt;/p&gt;</description>
                <environment></environment>
        <key id="158524">CSHARP-1066</key>
            <summary>Change BsonElement from a class to a struct</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="robert@mongodb.com">Robert Stam</reporter>
                        <labels>
                    </labels>
                <created>Tue, 16 Sep 2014 21:11:23 +0000</created>
                <updated>Thu, 2 Apr 2015 18:05:59 +0000</updated>
                            <resolved>Tue, 2 Dec 2014 17:56:39 +0000</resolved>
                                                    <fixVersion>2.0</fixVersion>
                                    <component>BSON</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="776542" author="rstam" created="Tue, 2 Dec 2014 17:56:30 +0000"  >&lt;p&gt;When we say you can&apos;t change the value of an existing element, that doesn&apos;t mean you can&apos;t modify BsonDocuments.&lt;/p&gt;

&lt;p&gt;You can do this:&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;
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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-top: 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;document[1] = value;&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;What you can&apos;t do any more (because BsonElement is now immutable) is:&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;
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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-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;document.GetElement(1).Name = name;&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;document.GetElement(1).Value = value;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
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&lt;p/&gt;</comment>
                            <comment id="776540" author="xgen-internal-githook" created="Tue, 2 Dec 2014 17:53:21 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;rstam&apos;, u&apos;name&apos;: u&apos;rstam&apos;, u&apos;email&apos;: u&apos;robert@robertstam.org&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-1066&quot; title=&quot;Change BsonElement from a class to a struct&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-1066&quot;&gt;&lt;del&gt;CSHARP-1066&lt;/del&gt;&lt;/a&gt;: Change BsonElement from a class to a struct.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/9a049d53e7967af04a8c85be6205a92543804433&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/9a049d53e7967af04a8c85be6205a92543804433&lt;/a&gt;&lt;/p&gt;</comment>
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