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    <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-4077] Support Range (..) operator</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4077</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;C#8 introduced support for ranges using &lt;tt&gt;..&lt;/tt&gt;. For example:&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;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 middle = array[1..^1];&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The array bounds can also be computed:&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;var moreMiddle = array[start..(start+numItems)];&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;We would have to support new overloads for collection methods that take &lt;tt&gt;Range&lt;/tt&gt; parameters.&lt;/p&gt;

&lt;p&gt;More details on the syntax can be found here:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/member-access-operators#range-operator-&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/operators/member-access-operators#range-operator-&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1989278">CSHARP-4077</key>
            <summary>Support Range (..) operator</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="james.kovacs@mongodb.com">James Kovacs</assignee>
                                    <reporter username="james.kovacs@mongodb.com">James Kovacs</reporter>
                        <labels>
                    </labels>
                <created>Thu, 24 Feb 2022 00:41:51 +0000</created>
                <updated>Thu, 24 Feb 2022 17:07:56 +0000</updated>
                            <resolved>Thu, 24 Feb 2022 17:07:56 +0000</resolved>
                                                                    <component>LINQ3</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="4374834" author="james.kovacs" created="Thu, 24 Feb 2022 17:07:56 +0000"  >&lt;p&gt;Turns out the C# compiler does not permit the Index and Range operators in expression trees. Including &lt;tt&gt;x.SomeArray&lt;span class=&quot;error&quot;&gt;&amp;#91;^1&amp;#93;&lt;/span&gt;&lt;/tt&gt; or &lt;tt&gt;x.SomeArray&lt;span class=&quot;error&quot;&gt;&amp;#91;1..^1&amp;#93;&lt;/span&gt;&lt;/tt&gt; in a LINQ expression results in the following compiler errors. The same errors occur if you assign the expression to &lt;tt&gt;Expression&amp;lt;T&amp;gt;&lt;/tt&gt;. Unfortunately this syntax is not permitted even using C# 10 and .NET 6.&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;
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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;error CS8790: An expression tree may not contain a pattern System.Index or System.Range indexer access&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;error CS8791: An expression tree may not contain a from-end index (&apos;^&apos;) expression.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;p/&gt;</comment>
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