System.Data.Tests.DataSetTest2.BeginInitTest C# (CSharp) Метод

        public void BeginInitTest()
        {
            DataSet ds = new DataSet();

            DataTable table1 = new DataTable("table1");
            DataTable table2 = new DataTable("table2");

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

            UniqueConstraint pkey = new UniqueConstraint("pk", new string[] { "col1" }, true);
            ForeignKeyConstraint fkey = new ForeignKeyConstraint("fk", "table1", new string[] { "col1" },
                                new string[] { "col2" }, AcceptRejectRule.Cascade,
                                Rule.Cascade, Rule.Cascade);
            DataRelation relation = new DataRelation("rel", "table1", "table2", new string[] { "col1" },
                                 new string[] { "col2" }, false);
            ds.BeginInit();
            table1.BeginInit();
            table2.BeginInit();

            ds.Tables.AddRange(new DataTable[] { table1, table2 });
            ds.Relations.AddRange(new DataRelation[] { relation });

            table1.Constraints.AddRange(new Constraint[] { pkey });
            table2.Constraints.AddRange(new Constraint[] { fkey });

            // The tables/relations shud not get added to the DataSet yet
            Assert.Equal(0, ds.Tables.Count);
            Assert.Equal(0, ds.Relations.Count);
            Assert.Equal(0, table1.Constraints.Count);
            Assert.Equal(0, table2.Constraints.Count);
            ds.EndInit();

            Assert.Equal(2, ds.Tables.Count);
            Assert.Equal(1, ds.Relations.Count);
            Assert.Equal(1, ds.Tables[0].Constraints.Count);
            Assert.Equal(1, ds.Tables[1].Constraints.Count);

            // Table shud still be in BeginInit .. 
            DataColumn col3 = new DataColumn("col2");
            UniqueConstraint uc = new UniqueConstraint("uc", new string[] { "col2" }, false);

            table1.Columns.AddRange(new DataColumn[] { col3 });
            table1.Constraints.AddRange(new Constraint[] { uc });

            Assert.Equal(1, table1.Columns.Count);
            Assert.Equal(1, table1.Constraints.Count);

            table1.EndInit();
            Assert.Equal(2, table1.Columns.Count);
            Assert.Equal(2, table1.Columns.Count);
        }