System.Data.Tests.DataColumnCollectionTest2.GetEnumerator C# (CSharp) Метод

        public void GetEnumerator()
        {
            DataTable dt = DataProvider.CreateUniqueConstraint();

            int counter = 0;
            IEnumerator myEnumerator = dt.Columns.GetEnumerator();
            while (myEnumerator.MoveNext())
            {
                counter++;
            }
            Assert.Equal(6, counter);

            Assert.Throws<InvalidOperationException>(() =>
            {
                DataColumn col = (DataColumn)myEnumerator.Current;
            });
        }