System.Data.Tests.ConstraintCollectionTest.AddFkException1 C# (CSharp) Метод

        public void AddFkException1()
        {
            var ds = new DataSet();
            ds.Tables.Add(_table);
            _table2.TableName = "TestTable2";
            ds.Tables.Add(_table2);

            _table.Rows.Add(new object[] { 1 });
            _table.Rows.Add(new object[] { 1 });

            //FKC: can't create unique constraint because duplicate values already exist
            Assert.Throws<ArgumentException>(() =>
            {
                var fkc = new ForeignKeyConstraint(_table.Columns[0], _table2.Columns[0]);
                _table2.Constraints.Add(fkc);
            });
        }