System.Data.Tests.DataSetReadXmlSchemaTest.ReadAnnotatedRelations_MultipleColumns C# (CSharp) Method

        public void ReadAnnotatedRelations_MultipleColumns()
        {
            var ds = new DataSet();
            ds.ReadXmlSchema(new StringReader(
                @"<?xml version=""1.0"" standalone=""yes""?>
                <xs:schema id=""NewDataSet"" xmlns="""" xmlns:xs=""http://www.w3.org/2001/XMLSchema"" xmlns:msdata=""urn:schemas-microsoft-com:xml-msdata"">
                  <xs:element name=""NewDataSet"" msdata:IsDataSet=""true"">
                    <xs:complexType>
                      <xs:choice maxOccurs=""unbounded"">
                        <xs:element name=""Table1"">
                          <xs:complexType>
                            <xs:sequence>
                              <xs:element name=""col_x0020_1"" type=""xs:int"" minOccurs=""0"" />
                              <xs:element name=""col2"" type=""xs:int"" minOccurs=""0"" />
                            </xs:sequence>
                          </xs:complexType>
                        </xs:element>
                        <xs:element name=""Table2"">
                          <xs:complexType>
                            <xs:sequence>
                              <xs:element name=""col1"" type=""xs:int"" minOccurs=""0"" />
                              <xs:element name=""col_x0020__x0020_2"" type=""xs:int"" minOccurs=""0"" />
                            </xs:sequence>
                          </xs:complexType>
                        </xs:element>
                      </xs:choice>
                    </xs:complexType>
                  </xs:element>
                  <xs:annotation>
                    <xs:appinfo>
                      <msdata:Relationship name=""rel"" msdata:parent=""Table1"" msdata:child=""Table2"" msdata:parentkey=""col_x0020_1 col2"" msdata:childkey=""col1 col_x0020__x0020_2"" />
                    </xs:appinfo>
                  </xs:annotation>
                </xs:schema>"));

            Assert.Equal(1, ds.Relations.Count);
            Assert.Equal("rel", ds.Relations[0].RelationName);
            Assert.Equal(2, ds.Relations[0].ParentColumns.Length);
            Assert.Equal(2, ds.Relations[0].ChildColumns.Length);
            Assert.Equal(0, ds.Tables[0].Constraints.Count);
            Assert.Equal(0, ds.Tables[1].Constraints.Count);

            AssertDataRelation("TestRel", ds.Relations[0], "rel", false, new string[] { "col 1", "col2" },
                    new string[] { "col1", "col  2" }, false, false);
        }
    }