System.Data.Tests.DataTableReadXmlSchemaTest.ReadConstraints C# (CSharp) Méthode

        public void ReadConstraints()
        {
            const string Schema =
                @"<?xml version=""1.0"" encoding=""utf-8""?>
                <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"" msdata:Locale=""en-US"">
                    <xs:complexType>
                      <xs:choice maxOccurs=""unbounded"">
                        <xs:element name=""Table1"">
                          <xs:complexType>
                            <xs:sequence>
                              <xs:element name=""col1"" 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:sequence>
                          </xs:complexType>
                        </xs:element>
                      </xs:choice>
                    </xs:complexType>
                    <xs:unique name=""Constraint1"">
                      <xs:selector xpath="".//Table1"" />
                      <xs:field xpath=""col1"" />
                    </xs:unique>
                    <xs:keyref name=""fk1"" refer=""Constraint1"" msdata:ConstraintOnly=""true"">
                      <xs:selector xpath="".//Table2"" />
                      <xs:field xpath=""col1"" />
                    </xs:keyref>
                  </xs:element>
                </xs:schema>";

            var ds = new DataSet();
            ds.Tables.Add(new DataTable());
            ds.Tables.Add(new DataTable());
            ds.Tables[0].ReadXmlSchema(new StringReader(Schema));
            ds.Tables[1].ReadXmlSchema(new StringReader(Schema));
            Assert.Equal(0, ds.Relations.Count);
            Assert.Equal(1, ds.Tables[0].Constraints.Count);
            Assert.Equal(0, ds.Tables[1].Constraints.Count);
            Assert.Equal("Constraint1", ds.Tables[0].Constraints[0].ConstraintName);
        }
    }