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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-4003] Support overriden properties with covariant return type</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4003</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;C# 9 introduced return type covariance, and that allows us to override properties with more specific types. MongoDB&apos;s driver can&apos;t serialize such properties at the moment.&lt;/p&gt;

&lt;p&gt;Example:&lt;/p&gt;

&lt;p&gt;{&lt;tt&gt;}&lt;/tt&gt;&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;    &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;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; virtual object SomeProperty { get; set; }&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;{{&lt;tt&gt;And:&lt;/tt&gt;}}&lt;br/&gt;
{&lt;tt&gt;}&lt;/tt&gt;&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;    &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;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; override string SomeProperty { get; set; }&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;{{&lt;tt&gt;The Mongo BSON serializer thinks these are two separate properties, and it throws an exception because there are two properties that map to the same element.&lt;/tt&gt;}}&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&lt;tt&gt;(BTW, I&apos;m new here so if I did something wrong with this feature request please let me know){&lt;/tt&gt;}&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</description>
                <environment></environment>
        <key id="1957234">CSHARP-4003</key>
            <summary>Support overriden properties with covariant return type</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="10300" iconUrl="https://jira.mongodb.org/images/icons/priorities/medium.svg">Unknown</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="gur@kissterra.com">Gur Galler</reporter>
                        <labels>
                            <label>net5</label>
                    </labels>
                <created>Thu, 30 Dec 2021 14:02:15 +0000</created>
                <updated>Thu, 31 Mar 2022 00:37:25 +0000</updated>
                                                                                                <votes>1</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="4283274" author="rstam" created="Mon, 10 Jan 2022 15:56:39 +0000"  >&lt;p&gt;Thanks again for submitting this ticket.&lt;/p&gt;

&lt;p&gt;We fully intend to support this new C# feature but it will be in a future release.&lt;/p&gt;

&lt;p&gt;I&apos;m transitioning the status of this ticket from Investigating to Open.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="4281073" author="JIRAUSER1264157" created="Fri, 7 Jan 2022 19:05:21 +0000"  >&lt;p&gt;Oh, yes. Sorry about that.&lt;/p&gt;

&lt;p&gt;Obviously covariance is not possible for setters (we don&apos;t want to allow any `object` to enter the setter that expects a `string`).&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;This is relevant only for read-only properties. In the context of the MongoDB driver, these will probably be initialized using a constructor parameter with a matching name&lt;/p&gt;</comment>
                            <comment id="4280826" author="rstam" created="Fri, 7 Jan 2022 17:27:11 +0000"  >&lt;p&gt;Thanks for the information that you are using .NET 5.0. I will use that target framework to investigate further.&lt;/p&gt;

&lt;p&gt;Now I&apos;m getting a compiler error on:&lt;/p&gt;
&lt;p/&gt;
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&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; override string SomeProperty { get; set; }&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Apparently covariant return types are only allowed on read-only properties.&lt;/p&gt;

&lt;p&gt;Can you confirm that you are actually using read-only properties?&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="4279971" author="JIRAUSER1264157" created="Fri, 7 Jan 2022 07:19:49 +0000"  >&lt;p&gt;Because this is a reflection-based feature, there should be no problem implementing it in a way that also supports older runtimes. Just don&apos;t assume the types are equal when dealing with a an override&lt;/p&gt;</comment>
                            <comment id="4279970" author="JIRAUSER1264157" created="Fri, 7 Jan 2022 07:17:30 +0000"  >&lt;p&gt;I tested it with .NET 5.0 and it worked. I assume this is the first version to support it, as it was released together with C# 9.0&lt;/p&gt;</comment>
                            <comment id="4279836" author="rstam" created="Fri, 7 Jan 2022 01:40:40 +0000"  >&lt;p&gt;When I attempt to reproduce this I get a compiler error:&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;Target runtime doesn&apos;t support covariant types in overrides.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;So even though C# 9 supports covariant types in overrides, apparently the target frameworks we currently compile and test against don&apos;t.&lt;/p&gt;

&lt;p&gt;I haven&apos;t been able to find out what target frameworks support covariant types in overrides.&lt;/p&gt;</comment>
                            <comment id="4274221" author="rstam" created="Tue, 4 Jan 2022 16:52:46 +0000"  >&lt;p&gt;Thank you for reporting this.&lt;/p&gt;

&lt;p&gt;We will investigate how we might be able to support this in a future release.&lt;/p&gt;</comment>
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