How Can I Detect Input Redirection (Keyboard vs. File) in C#?

Determining Input Source in C# Console Applications

Many console applications require distinguishing between keyboard input and input redirected from a file. This is essential for tailoring application behavior based on the input's origin.

The Most Efficient Approach

The most effective method for detecting input redirection involves using the Windows FileType() API function through P/Invoke. The following helper class simplifies this process:

<code class="language-csharp">public static class ConsoleEx
{
    public static bool IsInputRedirected => FileType.Char != GetFileType(GetStdHandle(StdHandle.Stdin));

    // P/Invoke declarations (omitted for brevity)
}</code>

Implementation

Checking for redirected input is straightforward:

<code class="language-csharp">bool isRedirected = ConsoleEx.IsInputRedirected;</code>

Enhanced .NET 4.5 Capabilities

It's important to note that .NET 4.5 and later versions include built-in functionality for this purpose. The helper class is unnecessary; instead, use:

<code class="language-csharp">bool isRedirected = Console.IsInputRedirected;</code>

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