StackOverflow2013

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2013-10-16T19:41:57.163
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2013-10-16T19:41:57.163
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Let's go through each line: <pre><code>myObject bob; // Creates a variable of type myObject, but it doesn't point anywhere bob = new myObject(); // bob now points to a newly created myObject instance myObject joe; // Creates a variable of type myObject, but it doesn't point anywhere joe = bob; // joe now refers to the same object as bob </code></pre> An important thing to keep in mind is that the last line copies over the value of the reference itself. Such as if <code>bob</code> points to address 1000, <code>joe</code> will also point there. Thus, if you change any data at this address, both <code>joe</code> and <code>bob</code> will point to that same data. However, you're welcome to set <code>joe</code> to point somewhere else and it will not affect <code>bob</code>. In other words: <pre><code>joe = null; // This will not null out bob </code></pre> If you wanted to create a brand new instance of <code>myObject</code>, you'd have to do this: <pre><code>joe = new myObject(); // This will also not affect bob </code></pre> Now, if you're trying to create a new instance of <code>myObject</code> in memory and copy over all of the properties of an existing instance, you'd have to do this yourself: <pre><code>joe = new myObject(); joe.X = bob.X; // Assuming X is not a reference itself joe.Y = bob.Y; // ...or you'd have to do this recursively </code></pre> .NET does not provide a way to do this copying for you. One common pattern is to make a constructor for <code>myObject()</code> that takes an instance of <code>myObject</code> and copies all its properties: <pre><code>joe = new myObject(bob); </code></pre>
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1. POC# object copying explanation?
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1. USMike Christensen
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1. POC# object copying explanation?
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