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POHow to mark a .net assembly as safe?
 

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  1. POHow to mark a .net assembly as safe?
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    <p>How do i mark as assembly as "safe"?</p> <p>Alternatively, how do i have Visual Studio tell me when something in my assembly is not "safe"?</p> <hr> <p>Sometimes you cannot use an assembly unless it is "safe" (e.g. <a href="https://stackoverflow.com/questions/1646980/why-wont-sql-server-register-my-assembly-as-safe">from SQL Server</a>).</p> <p>i would like my assembly to be marked as safe. If my assembly cannot be marked as safe because it's not safe, i'd like to know how i can know that my assembly is not safe.</p> <hr> <p>There are some concepts in Visual Studio that seem to relate to safe-ness, that may or may not have anything to do with an assembly being "safe": </p> <ol> <li><p><strong>Allow unsafe code</strong> assembly option:</p> <p><img src="https://i.stack.imgur.com/wUlxv.png" alt="enter image description here"></p> <ul> <li>What is allowed if i check the <em>allow unsafe code</em> option?</li> <li>What is not allowed if i uncheck the <em>allow unsafe code</em> option?</li> <li><p>What relation, if any, does "unsafe code" have to do with an assembly being "safe"?</p> <p>(i ask because my assembly doesn't "allow unsafe code", but allows P/Invoke calls - which i thought was the definition of "unsafe")</p></li> </ul></li> <li><p><strong><a href="http://msdn.microsoft.com/en-us/library/bhc3fa7f.aspx" rel="nofollow noreferrer">ClsCompliant</a></strong> assembly option:</p> <pre><code>[assembly: CLSCompliant(true)] namespace MyApplication </code></pre> <ul> <li>What is the relation, if any, does "cls compliant" code have to do with an assembly being "safe"?</li> </ul></li> <li><p><strong>unsafe</strong> code block:</p> <pre><code>int error; unsafe { error = 0x80004005; } </code></pre> <p>The code inside the <code>unsafe</code> block is "unsafe"</p></li> <li><p><a href="http://msdn.microsoft.com/en-us/library/ms182161.aspx" rel="nofollow noreferrer"><strong>UnsafeNativeMathods</strong></a></p> <p>Microsoft recommends creating a class called <code>UnsafeNativeMethods</code> that contain unsafe managed code:</p> <pre><code>[SuppressUnmanagedCodeSecurity] internal static class UnsafeNativeMethods { ... } </code></pre> <p>This contrasts with <code>SafeNativeMethods</code>:</p> <pre><code>[SuppressUnmanagedCodeSecurity] internal static class SafeNativeMethods { ... } </code></pre> <p>that contains safe native methods, and <code>NativeMethods</code>:</p> <pre><code>internal static class SafeNativeMethods { ... } </code></pre> <p>that contain native methods.</p></li> </ol> <p>How do i mark as assembly as "safe"?</p> <p>How does SQL know that as assembly is "not safe"?</p>
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    1. CO`SAFE` in this case is regarding the assemblies CAS level. There is a very good article on MSDN which talks about [designing assemblies for SQL Server](http://msdn.microsoft.com/en-us/library/ms189566.aspx) and elaborates on the `SAFE`ness of your assembly.
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