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Home/ Questions/Q 7030095
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T00:37:29+00:00 2026-05-28T00:37:29+00:00

Is it possible to use an alias defined in one file throughout an assembly?

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Is it possible to use an alias defined in one file throughout an assembly?

For eg. in Foo.cs I have

using IO = System.IO;
namespace Foo
{}

How can I use the alias “IO” in FooBar.cs

namespace Foo.Bar
{}
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  1. Editorial Team
    Editorial Team
    2026-05-28T00:37:30+00:00Added an answer on May 28, 2026 at 12:37 am

    According to MSDN

    The scope of a using directive is limited to the file in which it appears.

    So the answer is No. You cannot define an alias in one file and use it throughout assembly

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