99 lines
7.1 KiB
HTML
99 lines
7.1 KiB
HTML
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<title>CustomCreationConverter</title>
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<span class="productTitle">Json.NET - Quick Starts & API Documentation</span><br />
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<span class="topicTitle">CustomCreationConverter</span></div>
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<div id="content">
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<span style="color: DarkGray"> </span>
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<p>
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The CustomCreationConverter is a JsonConverter that provides a way to customize how an object is created
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during JSON deserialization.
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Once the object has been created it will then have values populated onto it by the serializer.
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</p>
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<div class="overflowpanel"> <div class="code">
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<div style="font-family: Courier New; font-size: 10pt; color: black;">
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<pre style="margin: 0px;"><span style="color: blue;">public</span> <span style="color: blue;">interface</span> <span style="color: #2b91af;">IPerson</span></pre>
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<pre style="margin: 0px;">{</pre>
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<pre style="margin: 0px;"> <span style="color: blue;">string</span> FirstName { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</pre>
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<pre style="margin: 0px;"> <span style="color: blue;">string</span> LastName { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</pre>
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<pre style="margin: 0px;"> <span style="color: #2b91af;">DateTime</span> BirthDate { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</pre>
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<pre style="margin: 0px;">}</pre>
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<pre style="margin: 0px;"> </pre>
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<pre style="margin: 0px;"><span style="color: blue;">public</span> <span style="color: blue;">class</span> <span style="color: #2b91af;">Employee</span> : <span style="color: #2b91af;">IPerson</span></pre>
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<pre style="margin: 0px;">{</pre>
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<pre style="margin: 0px;"> <span style="color: blue;">public</span> <span style="color: blue;">string</span> FirstName { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</pre>
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<pre style="margin: 0px;"> <span style="color: blue;">public</span> <span style="color: blue;">string</span> LastName { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</pre>
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<pre style="margin: 0px;"> <span style="color: blue;">public</span> <span style="color: #2b91af;">DateTime</span> BirthDate { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</pre>
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<pre style="margin: 0px;"> </pre>
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<pre style="margin: 0px;"> <span style="color: blue;">public</span> <span style="color: blue;">string</span> Department { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</pre>
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<pre style="margin: 0px;"> <span style="color: blue;">public</span> <span style="color: blue;">string</span> JobTitle { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</pre>
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<pre style="margin: 0px;">}</pre>
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<pre style="margin: 0px;"> </pre>
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<pre style="margin: 0px;"><span style="color: blue;">public</span> <span style="color: blue;">class</span> <span style="color: #2b91af;">PersonConverter</span> : <span style="color: #2b91af;">CustomCreationConverter</span><<span style="color: #2b91af;">IPerson</span>></pre>
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<pre style="margin: 0px;">{</pre>
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<pre style="margin: 0px;"> <span style="color: blue;">public</span> <span style="color: blue;">override</span> <span style="color: #2b91af;">IPerson</span> Create(<span style="color: #2b91af;">Type</span> objectType)</pre>
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<pre style="margin: 0px;"> {</pre>
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<pre style="margin: 0px;"> <span style="color: blue;">return</span> <span style="color: blue;">new</span> <span style="color: #2b91af;">Employee</span>();</pre>
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<pre style="margin: 0px;"> }</pre>
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<pre style="margin: 0px;">}</pre>
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</div>
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</div></div>
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<p>
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This is an extremely simple example. A more complicated scenario could involve an object factory or service locator
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which resolves the object at runtime.
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</p>
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<div class="overflowpanel"> <div class="code">
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<div style="font-family: Courier New; font-size: 10pt; color: black;">
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<pre style="margin: 0px;"><span style="color: green;">//[</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// {</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "FirstName": "Maurice",</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "LastName": "Moss",</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "BirthDate": "\/Date(252291661000)\/",</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "Department": "IT",</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "JobTitle": "Support"</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// },</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// {</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "FirstName": "Jen",</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "LastName": "Barber",</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "BirthDate": "\/Date(258771661000)\/",</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "Department": "IT",</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// "JobTitle": "Manager"</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">// }</span></pre>
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<pre style="margin: 0px;"><span style="color: green;">//]</span></pre>
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<pre style="margin: 0px;"> </pre>
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<pre style="margin: 0px;"><span style="color: #2b91af;">List</span><<span style="color: #2b91af;">IPerson</span>> people = <span style="color: #2b91af;">JsonConvert</span>.DeserializeObject<<span style="color: #2b91af;">List</span><<span style="color: #2b91af;">IPerson</span>>>(json, <span style="color: blue;">new</span> <span style="color: #2b91af;">PersonConverter</span>());</pre>
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<pre style="margin: 0px;"> </pre>
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<pre style="margin: 0px;"><span style="color: #2b91af;">IPerson</span> person = people[0];</pre>
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<pre style="margin: 0px;"> </pre>
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<pre style="margin: 0px;"><span style="color: #2b91af;">Console</span>.WriteLine(person.GetType());</pre>
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<pre style="margin: 0px;"><span style="color: green;">// Newtonsoft.Json.Tests.Employee</span></pre>
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<pre style="margin: 0px;"> </pre>
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<pre style="margin: 0px;"><span style="color: #2b91af;">Console</span>.WriteLine(person.FirstName);</pre>
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<pre style="margin: 0px;"><span style="color: green;">// Maurice</span></pre>
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<pre style="margin: 0px;"> </pre>
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<pre style="margin: 0px;"><span style="color: #2b91af;">Employee</span> employee = (<span style="color: #2b91af;">Employee</span>)person;</pre>
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<pre style="margin: 0px;"> </pre>
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<pre style="margin: 0px;"><span style="color: #2b91af;">Console</span>.WriteLine(employee.JobTitle);</pre>
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<pre style="margin: 0px;"><span style="color: green;">// Support</span></pre>
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</div>
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</div></div>
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