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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-2096] Make EnumRepresentationConvention also affect collections of Enums</title>
                <link>https://jira.mongodb.org/browse/CSHARP-2096</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;As someone mentioned on SO (&lt;a href=&quot;https://stackoverflow.com/questions/47313022/mongodb-c-sharp-driver-serializing-listenum-as-string&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://stackoverflow.com/questions/47313022/mongodb-c-sharp-driver-serializing-listenum-as-string&lt;/a&gt;), the following cases are currently not handled by the EnumRepresentationConvention:&lt;/p&gt;

&lt;p/&gt;
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					&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;List&amp;lt;EnumType&amp;gt; { get; set; }&lt;/span&gt;&lt;/pre&gt;
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					&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;List&amp;lt;List&amp;lt;List&amp;lt;EnumType&amp;gt;&amp;gt;&amp;gt; { get; set; }&lt;/span&gt;&lt;/pre&gt;
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					&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;Dictionary&amp;lt;EnumType, OtherType&amp;gt; { get; set; }&lt;/span&gt;&lt;/pre&gt;
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					&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;Dictionary&amp;lt;OtherType, EnumType&amp;gt; { get; set; }&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The convention currently only works on straight Enums as in&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;EnumType E { get; set; }&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;and nullable Enums as in:&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;EnumType? E { get; set; }&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This improvement is about making sure that (even nested) collections of the various kinds are affected by the convention as expected.&lt;/p&gt;</description>
                <environment></environment>
        <key id="459431">CSHARP-2096</key>
            <summary>Make EnumRepresentationConvention also affect collections of Enums</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</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="-1">Unassigned</assignee>
                                    <reporter username="daniel.hegener@gmx.net">Daniel Hegener</reporter>
                        <labels>
                            <label>rp-track</label>
                    </labels>
                <created>Wed, 15 Nov 2017 20:58:30 +0000</created>
                <updated>Wed, 8 Feb 2023 13:10:51 +0000</updated>
                                                                            <component>Serialization</component>
                                        <votes>6</votes>
                                    <watches>11</watches>
                                                                                                                <comments>
                            <comment id="3500912" author="james.kovacs" created="Sat, 21 Nov 2020 00:43:06 +0000"  >&lt;p&gt;We acknowledge that this ticket has been sitting idle for a considerable amount of time and appreciate everyone&apos;s continued interest in these improvements to the MongoDB .NET Driver. We are investing in improvements to make serialization behaviour in the driver more intuitive and less error prone. This is an example where the driver does not behave as expected necessarily.&lt;/p&gt;

&lt;p&gt;If you enable the &lt;tt&gt;EnumRepresentationConvention&lt;/tt&gt; or annotate an enum property/field with &lt;tt&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;BsonRepresentation(BsonType.String)&amp;#93;&lt;/span&gt;&lt;/tt&gt;, the enum is serialized as its string representation rather than its integer representation as expected. A &lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/pull/305&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;community-submitted PR&lt;/a&gt; was intended to address the case where you are serializing a collection of enums and wish each one serialized as a string. Unfortunately the PR only works for &lt;tt&gt;List&amp;lt;T&amp;gt;&lt;/tt&gt; and &lt;tt&gt;Dictionary&amp;lt;K,V&amp;gt;&lt;/tt&gt;. It does not work for arrays of enums (&lt;tt&gt;T[]&lt;/tt&gt;), other collection types (queues, stacks, linked lists, etc.), nor collection interfaces (&lt;tt&gt;IList&amp;lt;T&amp;gt;&lt;/tt&gt;, &lt;tt&gt;IDictionary&amp;lt;K,V&amp;gt;&lt;/tt&gt;, &lt;tt&gt;IEnumerable&amp;lt;T&amp;gt;&lt;/tt&gt;, &lt;tt&gt;IQueryable&amp;lt;T&amp;gt;&lt;/tt&gt;, &lt;tt&gt;ICollection&amp;lt;T&amp;gt;&lt;/tt&gt;, etc.). Even if we supported all these collection types and interfaces, it would not work for custom collection types.&lt;/p&gt;

&lt;p&gt;Rather than focusing on enums, let&apos;s consider the more general case of serialization conventions on collection types. The .NET Driver does not currently support the following either:&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;  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;[BsonRepresentation(BsonType.String)]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&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-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;public IEnumerable&amp;lt;ObjectId&amp;gt; ObjectIdCollection { get; set; }&lt;/span&gt;&lt;/pre&gt;
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&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;What is the expected result? Should each item in the collection be serialized as a string or should the entire collection be serialized as a single comma-separated string?&lt;/p&gt;

&lt;p&gt;Another case to consider is that of &lt;tt&gt;Dictionary&amp;lt;K,V&amp;gt;&lt;/tt&gt;:&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;[BsonRepresentation(BsonType.String)]&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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-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;public Dictionary&amp;lt;ObjectId, int&amp;gt; SomeDictionary { get; set; }&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;Should both keys and values be serialized as strings? Should we add a &lt;tt&gt;Target&lt;/tt&gt; parameter to specify what it applies to? Do we allow applying two &lt;tt&gt;BsonRepresentationAttributes&lt;/tt&gt;, one for &lt;tt&gt;Key&lt;/tt&gt; and another for &lt;tt&gt;Value&lt;/tt&gt;?&lt;/p&gt;

&lt;p&gt;The original problem of serializing collections of enums as their string representation can be solved either with a custom serializer on the containing type or for the enum itself. The other two mentioned cases can be solved similarly.&lt;/p&gt;

&lt;p&gt;We realize that this is not an ideal solution and we would like to provide better serialization semantics in the driver. We are reviewing serialization feature requests and bugs in an attempt to implement a more consistent and holistic approach to address problems such as this. We appreciate your patience and continued feedback.&lt;/p&gt;</comment>
                            <comment id="3192133" author="JIRAUSER1253211" created="Fri, 5 Jun 2020 13:29:40 +0000"  >&lt;p&gt;I am evaluating Mongodb in a C# environment, and also encountered this issue. It seems to also affect arrays of enums (and possibly all collections).&lt;/p&gt;

&lt;p&gt;Please consider merging &lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/pull/305&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/pull/305&lt;/a&gt;&lt;/p&gt;</comment>
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