DynamicInterfaceCastableHelpers.cs

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using System.Diagnostics;
 
namespace System.Runtime.InteropServices;
 
internal static class DynamicInterfaceCastableHelpers
{
    [StackTraceHidden]
    internal static bool IsInterfaceImplemented(IDynamicInterfaceCastable castable, RuntimeType interfaceType, bool throwIfNotImplemented)
    {
        bool flag = castable.IsInterfaceImplemented(new RuntimeTypeHandle(interfaceType), throwIfNotImplemented);
        if (!flag && throwIfNotImplemented)
        {
            throw new InvalidCastException(SR.Format(SR.InvalidCast_FromTo, castable.GetType(), interfaceType));
        }
        return flag;
    }
 
    [StackTraceHidden]
    internal static RuntimeType GetInterfaceImplementation(IDynamicInterfaceCastable castable, RuntimeType interfaceType)
    {
        RuntimeTypeHandle interfaceImplementation = castable.GetInterfaceImplementation(new RuntimeTypeHandle(interfaceType));
        if (interfaceImplementation.Equals(default(RuntimeTypeHandle)))
        {
            throw new InvalidCastException(SR.Format(SR.InvalidCast_FromTo, castable.GetType(), interfaceType));
        }
        RuntimeType runtimeType = interfaceImplementation.GetRuntimeType();
        if (!runtimeType.IsInterface)
        {
            throw new InvalidOperationException(SR.Format(SR.IDynamicInterfaceCastable_NotInterface, runtimeType.ToString()));
        }
        if (!runtimeType.IsDefined(typeof(DynamicInterfaceCastableImplementationAttribute), inherit: false))
        {
            throw new InvalidOperationException(SR.Format(SR.IDynamicInterfaceCastable_MissingImplementationAttribute, runtimeType, "DynamicInterfaceCastableImplementationAttribute"));
        }
        if (!runtimeType.IsAssignableTo(interfaceType))
        {
            throw new InvalidOperationException(SR.Format(SR.IDynamicInterfaceCastable_DoesNotImplementRequested, runtimeType, interfaceType));
        }
        return runtimeType;
    }
}