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    <p>It would appear earlNameless is correct, as adding another structure of ints:</p> <pre><code> struct C { public int iValue1; public int iValue2; } </code></pre> <p>to the end of the union seems to correct at least part of the problem. However, this is still flawed since the boolean will only consider a single-byte value and as demonstrated is not dependable. Finally the best answer I've come up with is to use a custom type for the marshaling.</p> <pre><code>[Serializable] [ComVisible(true)] public struct BOOL : IComparable, IConvertible, IComparable&lt;BOOL&gt;, IEquatable&lt;BOOL&gt;, IComparable&lt;bool&gt;, IEquatable&lt;bool&gt; { private uint _data; public BOOL(bool value) { _data = value ? 1u : 0u; } public BOOL(int value) { _data = unchecked((uint)value); } public BOOL(uint value) { _data = value; } private bool Value { get { return _data != 0; } } private IConvertible Convertible { get { return _data != 0; } } #region IComparable Members public int CompareTo(object obj) { return Value.CompareTo(obj); } #endregion #region IConvertible Members public TypeCode GetTypeCode() { return Value.GetTypeCode(); } public string ToString(IFormatProvider provider) { return Value.ToString(provider); } bool IConvertible.ToBoolean(IFormatProvider provider) { return Convertible.ToBoolean(provider); } byte IConvertible.ToByte(IFormatProvider provider) { return Convertible.ToByte(provider); } char IConvertible.ToChar(IFormatProvider provider) { return Convertible.ToChar(provider); } DateTime IConvertible.ToDateTime(IFormatProvider provider) { return Convertible.ToDateTime(provider); } decimal IConvertible.ToDecimal(IFormatProvider provider) { return Convertible.ToDecimal(provider); } double IConvertible.ToDouble(IFormatProvider provider) { return Convertible.ToDouble(provider); } short IConvertible.ToInt16(IFormatProvider provider) { return Convertible.ToInt16(provider); } int IConvertible.ToInt32(IFormatProvider provider) { return Convertible.ToInt32(provider); } long IConvertible.ToInt64(IFormatProvider provider) { return Convertible.ToInt64(provider); } sbyte IConvertible.ToSByte(IFormatProvider provider) { return Convertible.ToSByte(provider); } float IConvertible.ToSingle(IFormatProvider provider) { return Convertible.ToSingle(provider); } ushort IConvertible.ToUInt16(IFormatProvider provider) { return Convertible.ToUInt16(provider); } uint IConvertible.ToUInt32(IFormatProvider provider) { return Convertible.ToUInt32(provider); } ulong IConvertible.ToUInt64(IFormatProvider provider) { return Convertible.ToUInt64(provider); } object IConvertible.ToType(Type conversionType, IFormatProvider provider) { return Convertible.ToType(conversionType, provider); } #endregion #region IComparable&lt;bool&gt; Members public int CompareTo(BOOL other) { return Value.CompareTo(other.Value); } public int CompareTo(bool other) { return Value.CompareTo(other); } #endregion #region IEquatable&lt;bool&gt; Members public bool Equals(BOOL other) { return Value.Equals(other.Value); } public bool Equals(bool other) { return Value.Equals(other); } #endregion #region Object Override public override string ToString() { return Value.ToString(); } public override int GetHashCode() { return Value.GetHashCode(); } public override bool Equals(object obj) { return Value.Equals(obj); } #endregion #region implicit/explicit cast operators public static implicit operator bool(BOOL value) { return value.Value; } public static implicit operator BOOL(bool value) { return new BOOL(value); } public static explicit operator int(BOOL value) { return unchecked((int)value._data); } public static explicit operator BOOL(int value) { return new BOOL(value); } public static explicit operator uint(BOOL value) { return value._data; } public static explicit operator BOOL(uint value) { return new BOOL(value); } #endregion #region +, -, !, ~, ++, --, true, false unary operators overloaded. public static BOOL operator !(BOOL b) { return new BOOL(!b.Value); } public static bool operator true(BOOL b) { return b.Value; } public static bool operator false(BOOL b) { return !b.Value; } #endregion #region +, -, *, /, %, &amp;, |, ^, &lt;&lt;, &gt;&gt; binary operators overloaded. public static BOOL operator &amp;(BOOL b1, BOOL b2) { return new BOOL(b1.Value &amp; b2.Value); } public static BOOL operator |(BOOL b1, BOOL b2) { return new BOOL(b1.Value | b2.Value); } #endregion #region ==, !=, &lt;, &gt;, &lt;=, &gt;= comparison operators overloaded public static bool operator ==(BOOL b1, BOOL b2) { return (b1.Value == b2.Value); } public static bool operator !=(BOOL b1, BOOL b2) { return (b1.Value != b2.Value); } #endregion } </code></pre>
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