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The type of the argument to the DefaultValue attribute must match the parameter type
This error is generated when you use the wrong argument for the DefaultValueAttribute attribute value. Use a value that matches the parameter type.
Example
The following sample generates CS1908.
// CS1908.cs
// compile with: /target:library
using System.Runtime.InteropServices;
public interface ISomeInterface
{
void Bad([Optional] [DefaultParameterValue("true")] bool b); // CS1908
void Good([Optional] [DefaultParameterValue(true)] bool b); // OK
}