System.Data.Tests.DataTableTest4.XmlTest27 C# (CSharp) Метод

        public void XmlTest27()
        {
            MakeDummyTable();

            using (FileStream stream = new FileStream(_tempFile, FileMode.Create))
            {
                _dummyTable.WriteXml(stream, XmlWriteMode.DiffGram);
            }

            //Create a table and set the table name
            DataTable table = new DataTable("DummyTable");
            //define the table and add an extra column in the table
            table.Columns.Add(new DataColumn("id", typeof(int)));
            table.Columns.Add(new DataColumn("DummyItem", typeof(string)));
            //Add an extra column which does not match any column in the source diffram
            table.Columns.Add(new DataColumn("ExtraColumn", typeof(double)));

            XmlReadMode mode = XmlReadMode.Auto;

            using (FileStream stream = new FileStream(_tempFile, FileMode.Open))
            {
                mode = table.ReadXml(stream);
            }

            Assert.Equal(XmlReadMode.DiffGram, mode);
            Assert.Null(table.DataSet);
            Assert.Equal(3, table.Columns.Count);
            Assert.Equal(typeof(int), table.Columns[0].DataType);
            Assert.Equal(typeof(string), table.Columns[1].DataType);
            Assert.Equal(typeof(double), table.Columns[2].DataType);
            Assert.Equal(3, table.Rows.Count);

            //Check Rows
            DataRow row = table.Rows[0];
            Assert.Equal(1, row[0]);
            Assert.Equal("DummyItem 1", row[1]);
            Assert.Same(DBNull.Value, row[2]);
            Assert.Equal(DataRowState.Unchanged, row.RowState);

            row = table.Rows[1];
            Assert.Equal(2, row[0]);
            Assert.Equal("Changed_DummyItem 2", row[1]);
            Assert.Same(DBNull.Value, row[2]);
            Assert.Equal(DataRowState.Modified, row.RowState);

            row = table.Rows[2];
            Assert.Equal(3, row[0]);
            Assert.Equal("DummyItem 3", row[1]);
            Assert.Same(DBNull.Value, row[2]);
            Assert.Equal(DataRowState.Unchanged, row.RowState);
        }