System.Data.Tests.ConstraintCollectionTest2.IndexOf C# (CSharp) Метод

        public void IndexOf()
        {
            DataTable dt = DataProvider.CreateUniqueConstraint();
            Assert.Equal(0, dt.Constraints.IndexOf(dt.Constraints[0]));

            //Add new constraint
            Constraint con = new UniqueConstraint(dt.Columns["String1"], false);

            dt.Constraints.Add(con);
            Assert.Equal(1, dt.Constraints.IndexOf(con));

            //Remove it and try to look for it 

            dt.Constraints.Remove(con);
            Assert.Equal(-1, dt.Constraints.IndexOf(con));
        }