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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-3214] Missing extension methods for AsyncCursorSource and IAsyncCursor</title>
                <link>https://jira.mongodb.org/browse/CSHARP-3214</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;Why classes `IAsyncCursorSourceExtensions` and `IAsyncCursorExtensions` have no extension methods for `CountAsync`, `AverageAsync`, `MinAsync`, `MaxAsync` `SumAsync`, etc.?&lt;br/&gt;
Would it be better to add them?&lt;br/&gt;
If yes, I can add&lt;/p&gt;</description>
                <environment></environment>
        <key id="1488181">CSHARP-3214</key>
            <summary>Missing extension methods for AsyncCursorSource and IAsyncCursor</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="13202">Works as Designed</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="mj.ebrahimi72@gmail.com">Mohamad Javad Ebrahimi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Sep 2020 22:29:23 +0000</created>
                <updated>Fri, 27 Oct 2023 13:24:49 +0000</updated>
                            <resolved>Mon, 28 Sep 2020 16:08:13 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="3414364" author="rstam" created="Mon, 28 Sep 2020 16:07:59 +0000"  >&lt;p&gt;Methods like `CountAsync`, `AverageAsync`, `MinAsync`, `MaxAsync` , `SumAsync` etc... are LINQ methods that are intended to execute server side. You want to use these methods as part of a LINQ query.&lt;/p&gt;

&lt;p&gt;For example, the following LINQ query executes entirely server side and only the count is returned to the client:&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;var&#160;count&#160;=&#160;collection.AsQueryable().Where(x&#160;=&amp;gt;&#160;x.Age&#160;==&#160;&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;21&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;).Count();&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;You can use existing driver APIs to count the matching documents client side if you wish (though I would not recommend that):&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&#160;cursor&#160;=&#160;collection.FindSync(x&#160;=&amp;gt;&#160;x.Age&#160;==&#160;&lt;/span&gt;&lt;span style=&quot;color: #009900; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;21&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;/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&#160;count&#160;=&#160;cursor.ToEnumerable().Count();&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 note that:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;This transmits ALL matching documents to the client and the count is computed client side&lt;/li&gt;
	&lt;li&gt;The &lt;b&gt;entire&lt;/b&gt; documents are transmitted to the client even though the client only intends to count them&lt;/li&gt;
	&lt;li&gt;You use `ToEnumerable` on the cursor to signal the transition from server side to client side execution&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I can&apos;t think of any case where you would want to do the count client side rather than server side.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="3414121" author="esha.bhargava" created="Mon, 28 Sep 2020 14:45:40 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mj.ebrahimi72%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;mj.ebrahimi72@gmail.com&quot;&gt;mj.ebrahimi72@gmail.com&lt;/a&gt; Thanks for reporting this! We&apos;ll have a look at this soon and get back to you.&lt;/p&gt;</comment>
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