Implement IConvertible for FbZonedTime (#1195)

src/FirebirdSql.Data.FirebirdClient.Tests/FbZonedTimeTypeTests.cs

@@ -46,4 +46,12 @@ public void EqualityFalse(FbZonedTime expected, FbZonedTime actual)
 	{
 		Assert.AreNotEqual(expected, actual);
 	}
+
+	[Test]
+	public void ConvertToTimeSpanShouldNotThrow()
+	{
+		var fbZonedTime = new FbZonedTime(TimeSpan.FromMinutes(142), "UTC");
+
+		Assert.DoesNotThrow(() => Convert.ChangeType(fbZonedTime, typeof(TimeSpan)));
+	}
 }

src/FirebirdSql.Data.FirebirdClient/Types/FbZonedTime.cs

@@ -21,7 +21,7 @@
 namespace FirebirdSql.Data.Types;
 
 [StructLayout(LayoutKind.Auto)]
-public readonly struct FbZonedTime : IEquatable<FbZonedTime>
+public readonly struct FbZonedTime : IEquatable<FbZonedTime>, IConvertible
 {
 	public TimeSpan Time { get; }
 	public string TimeZone { get; }
@@ -70,8 +70,47 @@ public override int GetHashCode()
 		}
 	}
 
-	public bool Equals(FbZonedTime other) => Time.Equals(other.Time) && TimeZone.Equals(other.TimeZone, StringComparison.OrdinalIgnoreCase);
-
+	public bool Equals(FbZonedTime other) => Time.Equals(other.Time) && TimeZone.Equals(other.TimeZone, StringComparison.OrdinalIgnoreCase);
+
+	TypeCode IConvertible.GetTypeCode() => TypeCode.Object;
+
+	string IConvertible.ToString(IFormatProvider provider) => ToString();
+
+	object IConvertible.ToType(Type conversionType, IFormatProvider provider)
+		=> ReferenceEquals(conversionType, typeof(FbZonedTime))
+			? this
+			: ReferenceEquals(conversionType, typeof(TimeSpan))
+				? Time
+				: throw new InvalidCastException(conversionType?.FullName);
+
+	bool IConvertible.ToBoolean(IFormatProvider provider) => throw new InvalidCastException(nameof(Boolean));
+
+	byte IConvertible.ToByte(IFormatProvider provider) => throw new InvalidCastException(nameof(Byte));
+
+	char IConvertible.ToChar(IFormatProvider provider) => throw new InvalidCastException(nameof(Char));
+
+	DateTime IConvertible.ToDateTime(IFormatProvider provider) => throw new InvalidCastException(nameof(DateTime));
+
+	decimal IConvertible.ToDecimal(IFormatProvider provider) => throw new InvalidCastException(nameof(Decimal));
+
+	double IConvertible.ToDouble(IFormatProvider provider) => throw new InvalidCastException(nameof(Double));
+
+	short IConvertible.ToInt16(IFormatProvider provider) => throw new InvalidCastException(nameof(Int16));
+
+	int IConvertible.ToInt32(IFormatProvider provider) => throw new InvalidCastException(nameof(Int32));
+
+	long IConvertible.ToInt64(IFormatProvider provider) => throw new InvalidCastException(nameof(Int64));
+
+	sbyte IConvertible.ToSByte(IFormatProvider provider) => throw new InvalidCastException(nameof(SByte));
+
+	float IConvertible.ToSingle(IFormatProvider provider) => throw new InvalidCastException(nameof(Single));
+
+	ushort IConvertible.ToUInt16(IFormatProvider provider) => throw new InvalidCastException(nameof(UInt16));
+
+	uint IConvertible.ToUInt32(IFormatProvider provider) => throw new InvalidCastException(nameof(UInt32));
+
+	ulong IConvertible.ToUInt64(IFormatProvider provider) => throw new InvalidCastException(nameof(UInt64));
+
 	public static bool operator ==(FbZonedTime lhs, FbZonedTime rhs) => lhs.Equals(rhs);
 
 	public static bool operator !=(FbZonedTime lhs, FbZonedTime rhs) => lhs.Equals(rhs);