System.Numerics.Tests.cast_fromTest.RunUInt32ExplicitCastFromBigIntegerTests C# (CSharp) Méthode

        public static void RunUInt32ExplicitCastFromBigIntegerTests()
        {
            uint value;
            BigInteger bigInteger;

            // UInt32 Explicit Cast from BigInteger: Random value < UInt32.MinValue
            bigInteger = GenerateRandomBigIntegerLessThan(UInt32.MinValue, s_random);
            value = BitConverter.ToUInt32(ByteArrayMakeMinSize(bigInteger.ToByteArray(), 4), 0);
            Assert.Throws<OverflowException>(() => VerifyUInt32ExplicitCastFromBigInteger(value, bigInteger));

            // UInt32 Explicit Cast from BigInteger: UInt32.MinValue - 1
            bigInteger = new BigInteger(UInt32.MinValue);
            bigInteger -= BigInteger.One;
            value = BitConverter.ToUInt32(new byte[] { 0xff, 0xff, 0xff, 0xff }, 0);
            Assert.Throws<OverflowException>(() => VerifyUInt32ExplicitCastFromBigInteger(value, bigInteger));

            // UInt32 Explicit Cast from BigInteger: UInt32.MinValue
            VerifyUInt32ExplicitCastFromBigInteger(UInt32.MinValue);

            // UInt32 Explicit Cast from BigInteger: 0
            VerifyUInt32ExplicitCastFromBigInteger(0);

            // UInt32 Explicit Cast from BigInteger: 1
            VerifyUInt32ExplicitCastFromBigInteger(1);

            // UInt32 Explicit Cast from BigInteger: Random Positive
            for (int i = 0; i < NumberOfRandomIterations; ++i)
            {
                VerifyUInt32ExplicitCastFromBigInteger((UInt32)(UInt32.MaxValue * s_random.NextDouble()));
            }

            // UInt32 Explicit Cast from BigInteger: UInt32.MaxValue
            VerifyUInt32ExplicitCastFromBigInteger(UInt32.MaxValue);

            // UInt32 Explicit Cast from BigInteger: UInt32.MaxValue + 1
            bigInteger = new BigInteger(UInt32.MaxValue);
            bigInteger += BigInteger.One;
            value = BitConverter.ToUInt32(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyUInt32ExplicitCastFromBigInteger(value, bigInteger));

            // UInt32 Explicit Cast from BigInteger: Random value > UInt32.MaxValue
            bigInteger = GenerateRandomBigIntegerGreaterThan(UInt32.MaxValue, s_random);
            value = BitConverter.ToUInt32(bigInteger.ToByteArray(), 0);
            Assert.Throws<OverflowException>(() => VerifyUInt32ExplicitCastFromBigInteger(value, bigInteger));
        }