Dotnet Tricks

Replace Private Method

This Project ReplacePrivateMethod Replaces a private method's implementation with some other method, so when the private method is called your custom method runs. Ex:

1. Suppose a private method in a library you want to do something else:

private string? PrivateMethod()
{
    return "This is a private";
}

2. Replaces it so when it's called it runs following method instead:

// NOTE: Method in any class with any name
private string? PrivateMethod()
{
    return "This is an overwritten private";
}

This is done by replacing original method's Instructions' Location in IL with Instructions Location of method to replaced in IL.

Credits: Code Ease Blog