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POpartial class does not contain definition
 

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  1. POpartial class does not contain definition
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    <p>I got a weird problem and finally fixed it. Just like to share this expeirence so other people will search this topic and get the answer. I defined 2 partial classes, and compiled with the error of "does not contain a definition for ...". It was weird because it worked when the 2 classes were individual classes.</p> <p>Here is the code:</p> <p>Before: Foo1.cs</p> <pre><code>public class foo1{public void xyz(){}} </code></pre> <p>Foo2.cs</p> <pre><code>public class foo2{} </code></pre> <p>After: Foo1.cs</p> <pre><code>public partial class foo1{ public void xyz(){}} </code></pre> <p>Foo2.cs</p> <pre><code>public partial class foo1{} </code></pre> <p>Compilation said "MyNamespace.foo1 does not contain a definition for xyz". But xyz was good when the class was not partial! This could be caused by different namespaces. But I doubted that. Because if namespaces were different, it would not compile.</p> <p>I figured out at last. The problem was in Foo1.cs, the namespace was not defined but it was defined in Foo2.cs. Before I defined the partial class, the compiler provided a default namespace to Foo1.cs, that was the same as the one defined explicitly in Foo2.cs. But with the partial class, the compiler would not provide a default namespace to the partial class. This is why the compiler complained when a third party called foo1.xyz().</p> <p>I learned a lesson that always define the namespace explicitly for each single cs file, except that you do not define the namespace.</p>
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    1. PTQuestion
    1. USFerruccio
    1. USuser1807086
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    1. COSo the question is closed, right ?
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      1. USlstern
    2. COPlease post the answer as an answer to your own question, and accept that answer by clicking the check-mark next to it. Otherwise, this question will appear to be unanswered by other visitors to the site. Thanks.
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      1. POpartial class does not contain definition
      1. USDan J
    3. CO(Removed my other comment.) The lesson to learn is that if you want to merge to distinct classes into one single class, using `partial` declarations, then both parts must be in the same namespace. If no explicit namespace is given, a type belongs to the global namespace.
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      1. USJeppe Stig Nielsen
 

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