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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>
    </build-info>


<item>
            <title>[CSHARP-576] MongoDB BsonDocument Down-Casting</title>
                <link>https://jira.mongodb.org/browse/CSHARP-576</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;I have a collection in MongoDB which I&apos;m trying to &quot;FindAndModify&quot; using C# driver. This collection holds types of a base class and its derived classed, as follows:&lt;/p&gt;

&lt;p&gt;    &lt;span class=&quot;error&quot;&gt;&amp;#91;BsonDiscriminator(RootClass = true)&amp;#93;&lt;/span&gt;&lt;br/&gt;
    public class Father&lt;br/&gt;
    {&lt;br/&gt;
        public Guid Id &lt;/p&gt;
{ get; private set; }&lt;br/&gt;
    }&lt;br/&gt;
&lt;br/&gt;
   public class Son : Father&lt;br/&gt;
   {&lt;br/&gt;
        public string SomeProperty { get; private set; }
&lt;p&gt;   }&lt;/p&gt;

&lt;p&gt;When I&apos;m trying to cast the BsonDocument to my base class, after the FindAndModify, where the result is &quot;Son&quot;:&lt;/p&gt;

&lt;p&gt;Father modifiedDocument = result.GetModifiedDocumentAs&amp;lt;Father&amp;gt;();&lt;/p&gt;

&lt;p&gt;I get the following exception:&lt;/p&gt;

&lt;p&gt;    System.IO.FileFormatException: Element &apos;SomeProperty&apos; does not match any field or property of class Father.&lt;/p&gt;

&lt;p&gt;Any idea why? -Can&apos;t I perform a down cast here?&lt;/p&gt;

&lt;p&gt;Thanks, &lt;br/&gt;
Nir.&lt;/p&gt;</description>
                <environment></environment>
        <key id="51086">CSHARP-576</key>
            <summary>MongoDB BsonDocument Down-Casting</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="9">Done</resolution>
                                        <assignee username="robert@mongodb.com">Robert Stam</assignee>
                                    <reporter username="nirpi">Nir Pinhasov</reporter>
                        <labels>
                            <label>question</label>
                    </labels>
                <created>Fri, 21 Sep 2012 16:30:50 +0000</created>
                <updated>Fri, 5 Apr 2019 13:59:26 +0000</updated>
                            <resolved>Mon, 24 Sep 2012 20:25:54 +0000</resolved>
                                    <version>1.6</version>
                                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="167015" author="rstam" created="Sat, 22 Sep 2012 12:25:24 +0000"  >&lt;p&gt;You could also use the BsonKnownTypes attribute on the Father class:&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;&amp;nbsp;&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;   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;[BsonDiscriminator(RootClass = true)]&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;   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;[BsonKnownTypes(typeof(Son))]&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;   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 class Father&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;   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;/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;   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 Guid Id { get; private set; }&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;}&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;The trick is that the driver must somehow or another &quot;know&quot; about the Son class before you can deserialize an instance of it.&lt;/p&gt;</comment>
                            <comment id="167000" author="nirpi" created="Sat, 22 Sep 2012 08:29:30 +0000"  >&lt;p&gt;I was able to solve this issue by registering the class map of the &quot;Son&quot; type on load. Here&apos;s a reference to the code I&apos;m using:&lt;/p&gt;

&lt;p&gt;        if (!BsonClassMap.IsClassMapRegistered(typeof(T)))&lt;br/&gt;
        {&lt;br/&gt;
            BsonClassMap.RegisterClassMap&amp;lt;T&amp;gt;&lt;br/&gt;
            (cm =&amp;gt;&lt;br/&gt;
            &lt;/p&gt;
{
                cm.AutoMap();
            }
&lt;p&gt;);&lt;br/&gt;
        } &lt;/p&gt;

&lt;p&gt;So now I&apos;m using this for all my stored objects on load.&lt;br/&gt;
I got this to work when noticed the last post of Robert, here:&lt;br/&gt;
&lt;a href=&quot;https://groups.google.com/forum/?fromgroups=#!topic/mongodb-user/LTkfPshnh9o&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://groups.google.com/forum/?fromgroups=#!topic/mongodb-user/LTkfPshnh9o&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;So, thanks!&lt;/p&gt;</comment>
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