System.Data.Tests.DataSetTest.ReadWriteXmlDiffGram C# (CSharp) Method

        public void ReadWriteXmlDiffGram()
        {
            var ds = new DataSet();
            // It is not a diffgram, so no data loading should be done.
            ds.ReadXml(new StringReader(DataProvider.region), XmlReadMode.DiffGram);
            TextWriter writer = new StringWriter();
            ds.WriteXml(writer);

            string TextString = writer.ToString();
            Assert.Equal("<NewDataSet />", TextString);

            ds.WriteXml(writer, XmlWriteMode.DiffGram);
            TextString = writer.ToString();

            Assert.Equal("<NewDataSet /><diffgr:diffgram xmlns:msdata=\"urn:schemas-microsoft-com:xml-msdata\" xmlns:diffgr=\"urn:schemas-microsoft-com:xml-diffgram-v1\" />", TextString);


            ds = new DataSet();
            ds.ReadXml(new StringReader(DataProvider.region));
            DataTable table = ds.Tables["Region"];
            table.Rows[0][0] = "64";
            ds.ReadXml(new StringReader(DataProvider.region), XmlReadMode.DiffGram);
            ds.WriteXml(writer, XmlWriteMode.DiffGram);

            TextString = writer.ToString();
            string substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("<NewDataSet /><diffgr:diffgram xmlns:msdata=\"urn:schemas-microsoft-com:xml-msdata\" xmlns:diffgr=\"urn:schemas-microsoft-com:xml-diffgram-v1\" /><diffgr:diffgram xmlns:msdata=\"urn:schemas-microsoft-com:xml-msdata\" xmlns:diffgr=\"urn:schemas-microsoft-com:xml-diffgram-v1\">", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("  <Root>", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("    <Region diffgr:id=\"Region1\" msdata:rowOrder=\"0\" diffgr:hasChanges=\"inserted\">", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("      <RegionID>64</RegionID>", substring);

            // not '\n' but literal '\n'
            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("      <RegionDescription>Eastern", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("               </RegionDescription>", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("    </Region>", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("    <Region diffgr:id=\"Region2\" msdata:rowOrder=\"1\" diffgr:hasChanges=\"inserted\">", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("      <RegionID>2</RegionID>", substring);

            // not '\n' but literal '\n'
            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("      <RegionDescription>Western", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("               </RegionDescription>", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("    </Region>", substring);

            substring = TextString.Substring(0, TextString.IndexOfAny(new[] { '\r', '\n' }));
            TextString = TextString.Substring(TextString.IndexOf('\n') + 1);
            Assert.Equal("  </Root>", substring);

            Assert.Equal("</diffgr:diffgram>", TextString);
        }