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Asked: 2026-05-25T00:02:03+00:00

Playing around in Mono 2.10 REPL: csharp> string a = true; csharp> a.ToBoolean(CultureInfo.InvariantCulture); {interactive}(1,4):

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Playing around in Mono 2.10 REPL:

csharp> string a = "true";
csharp> a.ToBoolean(CultureInfo.InvariantCulture);
{interactive}(1,4): error CS1061: Type `string' does not contain a definition fo
r `ToBoolean' and no extension method `ToBoolean' of type `string' could be foun
d (are you missing a using directive or an assembly reference?)
C:\PROGRA~1\MONO-2~1.2\lib\mono\4.0\mscorlib.dll (Location of the symbol related
 to previous error)


csharp> ((IConvertible)a).ToBoolean(CultureInfo.InvariantCulture);
true
csharp>

According to docs, System.String implements IConvertible. If this is true, why does

a.ToBoolean(CultureInfo.InvariantCulture);

fail?

Why do I have to cast it to IConvertible to make ToBoolean work?

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1 Answer

  1. Editorial Team

    As the documentation for ToBoolan() for string on MSDN states:

    This member is an explicit interface member implementation. It can be used only when the String instance is cast to an IConvertible interface. The recommended alternative is to call the Convert.ToBoolean(String) method.

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