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Asked: 2026-05-12T07:20:11+00:00

I would like to modify the way my C#/.NET application works internally. I have

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I would like to modify the way my C#/.NET application works internally. I have dug into the .NET framework with Reflector and found a pretty good place where I could use a different implementation of a method. This is an internal class in the System.Windows.Forms namespace. You obviously cannot alter the code of this class with the usual means so I thought it would be possible to replace a method in there through reflection at runtime. The method I would like to entirely replace for my application is this:

public static WindowsFontQuality WindowsFontQualityFromTextRenderingHint(Graphics g)

in the class:

internal sealed class System.Windows.Forms.Internal.WindowsFont

Is there any way to load that type and replace the method at runtime, not affecting any other applications that are currently running or started afterwards? I have tried to load the type with Type.GetType() and similar things but failed so far.

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1 Answer

  1. Editorial Team

    You may be able to do this with the debugger API – but it’s a really, really bad idea.

    For one thing, running with the debugger hooks installed may well be slower – but more importantly, tampering with the framework code could easily lead to unexpected behaviour. Do you know exactly how this method is used, in all possible scenarios, even within your own app?

    It would also quite possibly have undesirable legal consequences, although you should consult a lawyer about that.

    I would personally abandon this line of thinking and try to work out a different way to accomplish whatever it is you’re trying to do.

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