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

        public void Remove_Constraint()
        {
            DataTable table1 = new DataTable("table1");
            DataTable table2 = new DataTable("table2");

            DataColumn col1 = table1.Columns.Add("col1", typeof(int));
            DataColumn col2 = table1.Columns.Add("col2", typeof(int));
            DataColumn col3 = table2.Columns.Add("col1", typeof(int));

            Constraint c1 = table1.Constraints.Add("unique1", col1, false);
            Constraint c2 = table1.Constraints.Add("unique2", col2, false);
            Constraint c3 = table2.Constraints.Add("fk", col1, col3);

            table1.Constraints.Remove(c1);
            table1.Constraints.Remove(c2);
            table2.Constraints.Remove(c3);

            Assert.Equal(0, table1.Constraints.Count);
            Assert.Equal(0, table2.Constraints.Count);

            DataSet ds = new DataSet();
            ds.Tables.Add(table1);
            ds.Tables.Add(table2);

            c1 = table1.Constraints.Add("unique1", col1, false);
            c2 = table1.Constraints.Add("unique2", col2, false);
            c3 = table2.Constraints.Add("fk", col1, col3);

            Assert.Throws<ArgumentException>(() => table1.Constraints.Remove(c1));

            Assert.Equal(2, table1.Constraints.Count);

            table1.Constraints.Remove(c2);
            Assert.Equal(1, table1.Constraints.Count);

            table2.Constraints.Remove(c3);
            Assert.Equal(1, table1.Constraints.Count);
            Assert.Equal(0, table2.Constraints.Count);

            table1.Constraints.Remove(c1);
            Assert.Equal(0, table1.Constraints.Count);
        }