System.Data.Tests.DataRelationCollectionTest.Contains C# (CSharp) Метод

        public void Contains()
        {
            DataRelationCollection drcol = _dataset.Relations;
            DataColumn parentCol = _dataset.Tables["Customer"].Columns["custid"];
            DataColumn childCol = _dataset.Tables["Order"].Columns["custid"];
            DataRelation dr = new DataRelation("CustOrder", parentCol, childCol);

            drcol.Add(dr);
            Assert.True(drcol.Contains(dr.RelationName));
            string drnull = "";
            Assert.False(drcol.Contains(drnull));
            dr = new DataRelation("newRelation", childCol, parentCol);
            Assert.False(drcol.Contains("NoSuchRelation"));
        }