LiRuochen_WorkFlow/Newtonsoft.Json
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

-Line endings

Browse Source
This commit is contained in:
James Newton-King
2012-04-08 18:10:07 +12:00
parent a139d7bf20
commit 83618b1ea0
381 changed files with 96885 additions and 96885 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Doc/PreserveObjectReferences.html
+69 -69
View File
@@ -1,27 +1,27 @@
<html>
<head>
<title>Serialization and Preserving Object References</title>
<link href="styles.css" rel="stylesheet" type="text/css" />
<link href="custom.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="control">
<span class="productTitle">Json.NET - Quick Starts & API Documentation</span><br />
<span class="topicTitle">Serialization and Preserving Object References</span></div>
<div id="content">
<span style="color: DarkGray"> </span>
<p>By default Json.NET will serialize all objects it encounters by value. If a list
contains two Person references, and both references point to the same object
then the JsonSerializer will write out all the names and values for each
reference.</p>
<div class="overflowpanel"> <div class="code">
<html>
<head>
<title>Serialization and Preserving Object References</title>
<link href="styles.css" rel="stylesheet" type="text/css" />
<link href="custom.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="control">
<span class="productTitle">Json.NET - Quick Starts & API Documentation</span><br />
<span class="topicTitle">Serialization and Preserving Object References</span></div>
<div id="content">
<span style="color: DarkGray"> </span>
<p>By default Json.NET will serialize all objects it encounters by value. If a list
contains two Person references, and both references point to the same object
then the JsonSerializer will write out all the names and values for each
reference.</p>
<div class="overflowpanel"> <div class="code">
<div style="font-family: Courier New; font-size: 10pt; color: black;">
<pre style="margin: 0px;"><span style="color: #2b91af;">Person</span> p = <span style="color: blue;">new</span> <span style="color: #2b91af;">Person</span></pre>
<pre style="margin: 0px;">&nbsp; {</pre>
@@ -49,16 +49,16 @@
<pre style="margin: 0px;"><span style="color: green;">//]</span></pre>
</div>
</div></div>
<p>In most cases this is the desired result but in certain scenarios writing the second item in the list as a reference to the first is a better solution.
If the above JSON was deserialized now then the returned list would contain two
completely separate Person objects with the same values. Writing references by value will also cause problems on objects where a
circular reference occurs.</p>
<h3>PreserveReferencesHandling</h3>
<p>Settings PreserveReferencesHandling will track object references when serializing
and deserializing JSON.</p>
<div class="overflowpanel"> <div class="code">
<p>In most cases this is the desired result but in certain scenarios writing the second item in the list as a reference to the first is a better solution.
If the above JSON was deserialized now then the returned list would contain two
completely separate Person objects with the same values. Writing references by value will also cause problems on objects where a
circular reference occurs.</p>
<h3>PreserveReferencesHandling</h3>
<p>Settings PreserveReferencesHandling will track object references when serializing
and deserializing JSON.</p>
<div class="overflowpanel"> <div class="code">
<div style="font-family: Courier New; font-size: 10pt; color: black;">
<pre style="margin: 0px;"><span style="color: blue;">string</span> json = <span style="color: #2b91af;">JsonConvert</span>.SerializeObject(people, <span style="color: #2b91af;">Formatting</span>.Indented,</pre>
<pre style="margin: 0px;">&nbsp; <span style="color: blue;">new</span> <span style="color: #2b91af;">JsonSerializerSettings</span> { PreserveReferencesHandling = <span style="color: #2b91af;">PreserveReferencesHandling</span>.Objects });</pre>
@@ -92,27 +92,27 @@
<pre style="margin: 0px;"><span style="color: green;">// true</span></pre>
</div>
</div></div>
<p>The first Person in the list is serizlied with the addition of an object Id. The
second Person in JSON is now only a reference to the first.</p>
<p>With PreserveReferencesHandling on now only one Person object is created on
deserialization and the list contains two references to it, mirroring what we
started with.</p>
<h3>IsReference on JsonObjectAttribute, JsonArrayAttribute and JsonPropertyAttribute</h3>
<p>The PreserveReferencesHandling setting on the JsonSerializer will change
how all objects are serialized and deserialized. For fine grain control over which
objects and members should be serialized as a reference there is the IsReference property on
the JsonObjectAttribute, JsonArrayAttribute and JsonPropertyAttribute.</p>
<p>Setting IsReference on JsonObjectAttribute or JsonArrayAttribute to true will
mean the JsonSerializer will always serialize the type the attribute is against
as a reference. Setting IsReference on the JsonPropertyAttribute to true will
serialize only that property as a reference.</p>
<div class="overflowpanel"> <div class="code">
<p>The first Person in the list is serizlied with the addition of an object Id. The
second Person in JSON is now only a reference to the first.</p>
<p>With PreserveReferencesHandling on now only one Person object is created on
deserialization and the list contains two references to it, mirroring what we
started with.</p>
<h3>IsReference on JsonObjectAttribute, JsonArrayAttribute and JsonPropertyAttribute</h3>
<p>The PreserveReferencesHandling setting on the JsonSerializer will change
how all objects are serialized and deserialized. For fine grain control over which
objects and members should be serialized as a reference there is the IsReference property on
the JsonObjectAttribute, JsonArrayAttribute and JsonPropertyAttribute.</p>
<p>Setting IsReference on JsonObjectAttribute or JsonArrayAttribute to true will
mean the JsonSerializer will always serialize the type the attribute is against
as a reference. Setting IsReference on the JsonPropertyAttribute to true will
serialize only that property as a reference.</p>
<div class="overflowpanel"> <div class="code">
<div style="font-family: Courier New; font-size: 10pt; color: black;">
<pre style="margin: 0px;">[<span style="color: #2b91af;">JsonObject</span>(IsReference = <span style="color: blue;">true</span>)]</pre>
<pre style="margin: 0px;"><span style="color: blue;">public</span> <span style="color: blue;">class</span> <span style="color: #2b91af;">EmployeeReference</span></pre>
@@ -121,18 +121,18 @@
<pre style="margin: 0px;">&nbsp; <span style="color: blue;">public</span> <span style="color: #2b91af;">EmployeeReference</span> Manager { <span style="color: blue;">get</span>; <span style="color: blue;">set</span>; }</pre>
<pre style="margin: 0px;">}</pre>
</div>
</div></div>
<h3>IReferenceResolver</h3>
<p>To customize how references are generated and resolved the <a href="./html/T_Newtonsoft_Json_Serialization_IReferenceResolver.htm">IReferenceResolver</a> interface is available to inherit from and use with the JsonSerializer.</p>
<div id="footer">
</div>
</div>
</body>
</div></div>
<h3>IReferenceResolver</h3>
<p>To customize how references are generated and resolved the <a href="./html/T_Newtonsoft_Json_Serialization_IReferenceResolver.htm">IReferenceResolver</a> interface is available to inherit from and use with the JsonSerializer.</p>
<div id="footer">
</div>
</div>
</body>
</html>