this method is written to fix Subtitle Edit's GetRegExContextMenu(Combobox/TextBox) nightmare

expression-tree.cs

// this method is written to fix Subtitle Edit's GetRegExContextMenu(Combobox/TextBox) nightmare

// make more sense as an extension method.
public static Action<TControl, string> BuildContextMenuRegex<TControl>()
{
    var setMethod = typeof(TControl).GetProperty("SelectedText").GetSetMethod();
    var instanceParam = Expression.Parameter(typeof(TControl), "instance");
    var regexTokenParam = Expression.Parameter(typeof(string), "regexToken");
    var lambaExp = Expression.Lambda<Action<TControl, string>>(Expression.Call(instanceParam, setMethod, regexTokenParam), instanceParam, regexTokenParam);
    return lambaExp.Compile();
}