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<h1>Example <span class="PrimaryUUID">Guid</span></h1>
<p>This example demonstrates how you can use <span class="PrimaryUUID">Guid</span>s to identify objects across objects containers. Take a look advantages and disadvantages of <span class="PrimaryUUID">Guid</span>s: <a href="comparison_of_ids.htm" target="" title="" alt="" class="MCXref" xrefformat="See "{paratext}"">See "Comparison Of Different IDs"</a></p>
<p>This example assumes that all object have a common super-class, IDHolder, which holds the <span class="PrimaryUUID">Guid</span> in a field. </p>
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<pre class="prettyprint" xml:space="preserve">private readonly Guid guid = Guid.NewGuid();
public Guid ObjectId
{
get { return guid; }
}
</pre>
<div class="codesnippet-meta">IDHolder.cs: generate the id
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<div class="codesnippet" MadCap:conditions="Primary.VB.NET">
<pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Private ReadOnly guid As Guid = Guid.NewGuid()
Public ReadOnly Property ObjectId() As Guid
Get
Return guid
End Get
End Property
</pre>
<div class="codesnippet-meta">IDHolder.vb: generate the id
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<p>It's important to index the id-field, otherwise looking up for object by id will be slow.</p>
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<pre class="prettyprint" xml:space="preserve">configuration.Common.ObjectClass(typeof (IDHolder)).ObjectField("guid").Indexed(true);</pre>
<div class="codesnippet-meta">UuidOnObject.cs: index the uuid-field
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<div class="codesnippet" MadCap:conditions="Primary.VB.NET">
<pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">configuration.Common.ObjectClass(GetType(IDHolder)).ObjectField("guid").Indexed(True)</pre>
<div class="codesnippet-meta">UuidOnObject.vb: index the uuid-field
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<p>The id is hold by the object itself, so you can get it directly.</p>
<div class="codesnippet" MadCap:conditions="Primary.c#">
<pre class="prettyprint" xml:space="preserve">IDHolder uuidHolder = (IDHolder) obj;
Guid uuid = uuidHolder.ObjectId;</pre>
<div class="codesnippet-meta">UuidOnObject.cs: get the uuid
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<div class="codesnippet" MadCap:conditions="Primary.VB.NET">
<pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Dim uuidHolder As IDHolder = DirectCast(obj, IDHolder)
Dim uuid As Guid = uuidHolder.ObjectId</pre>
<div class="codesnippet-meta">UuidOnObject.vb: get the uuid
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<p>You can get the object you can by a regular query. </p>
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<pre class="prettyprint" xml:space="preserve">IDHolder instance = container.Query(delegate(IDHolder o) { return o.ObjectId.Equals(idForObject); })[0];</pre>
<div class="codesnippet-meta">UuidOnObject.cs: get an object its UUID
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<div class="codesnippet" MadCap:conditions="Primary.VB.NET">
<pre class="prettyprint lang-vb" MadCap:conditions="Primary.Online" xml:space="preserve">Dim instance As IDHolder = container.Query(Function(o As IDHolder) o.ObjectId.Equals(idForObject))(0)</pre>
<div class="codesnippet-meta">UuidOnObject.vb: get an object its UUID
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