Should C# `using` Directives Be Placed Before or After Namespace Declarations?

C#

The instruction should be placed before or after the name space declaration? using STYLECOP insists on putting instructions in the name space, which triggers the issue of potential technology impact. Understanding this slight difference can significantly improve the maintenance of the code.

If instructions are placed outside the naming space, as shown in the following example: using

File2.cs introduced a conflict named space statement: using

<code class="language-csharp">// File1.cs
using System;
namespace Outer.Inner
{
    // ...
}</code>

The compiler will give priority to the innermost name space (File2) instead of

instructions, resulting in potential errors.

<code class="language-csharp">// File2.cs
namespace Outer
{
    // ...
}</code>

But by putting the instruction in the name space, as shown below:

using

The compiler searches System.math before the Outr. Even if File2 introduces the definition of unclear naming space, it can also ensure code compatibility.

using It is worth noting that when the type is defined in the outer name space, not in the outer.inner, no matter what the

instruction is, File1 will not work normally. This emphasizes the characteristics of the compiler priority to consider the characteristics of the innermost closed name space.

<code class="language-csharp">// File1b.cs
namespace Outer.Inner
{
    using System;
    // ...
}</code>

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