DataTable.WriteXmlSchema Method

Definition

Escribe la estructura de datos actual del objeto DataTable como esquema XML.Writes the current data structure of the DataTable as an XML schema.

Overloads

WriteXmlSchema(Stream)

Escribe en la secuencia especificada la estructura de datos actual del objeto DataTable como esquema XML.Writes the current data structure of the DataTable as an XML schema to the specified stream.

WriteXmlSchema(TextWriter)

Escribe la estructura de datos actual del objeto DataTable como esquema XML, utilizando el objeto TextWriter especificado.Writes the current data structure of the DataTable as an XML schema using the specified TextWriter.

WriteXmlSchema(String)

Escribe en el archivo especificado la estructura de datos actual del objeto DataTable como esquema XML.Writes the current data structure of the DataTable as an XML schema to the specified file.

WriteXmlSchema(XmlWriter)

Escribe la estructura de datos actual del objeto DataTable como esquema XML, utilizando el objeto XmlWriter especificado.Writes the current data structure of the DataTable as an XML schema using the specified XmlWriter.

WriteXmlSchema(Stream, Boolean)

Escribe en la secuencia especificada la estructura de datos actual del objeto DataTable como esquema XML.Writes the current data structure of the DataTable as an XML schema to the specified stream. Para guardar el esquema de la tabla y de todos sus descendientes, establezca el parámetro writeHierarchy en true.To save the schema for the table and all its descendants, set the writeHierarchy parameter to true.

WriteXmlSchema(TextWriter, Boolean)

Escribe la estructura de datos actual del objeto DataTable como esquema XML, utilizando el objeto TextWriter especificado.Writes the current data structure of the DataTable as an XML schema using the specified TextWriter. Para guardar el esquema de la tabla y de todos sus descendientes, establezca el parámetro writeHierarchy en true.To save the schema for the table and all its descendants, set the writeHierarchy parameter to true.

WriteXmlSchema(XmlWriter, Boolean)

Escribe la estructura de datos actual del objeto DataTable como esquema XML, utilizando el objeto XmlWriter especificado.Writes the current data structure of the DataTable as an XML schema using the specified XmlWriter. Para guardar el esquema de la tabla y de todos sus descendientes, establezca el parámetro writeHierarchy en true.To save the schema for the table and all its descendants, set the writeHierarchy parameter to true.

WriteXmlSchema(String, Boolean)

Escribe en el archivo especificado la estructura de datos actual del objeto DataTable como esquema XML.Writes the current data structure of the DataTable as an XML schema to the specified file. Para guardar el esquema de la tabla y de todos sus descendientes, establezca el parámetro writeHierarchy en true.To save the schema for the table and all its descendants, set the writeHierarchy parameter to true.

Examples

La siguiente aplicación de consola crea dos instancias de DataTable, agrega cada una a una DataSet, crea una DataRelation relacionada con las dos tablas y, a continuación, usa el método WriteXmlSchema para escribir los datos contenidos en la tabla primaria en una TextWriter.The following console application creates two DataTable instances, adds each to a DataSet, creates a DataRelation relating the two tables, and then uses the WriteXmlSchema method to write the data contained within the parent table to a TextWriter. En el ejemplo se muestra el comportamiento al establecer el parámetro writeHierarchy en cada uno de sus valores.The example demonstrates the behavior when setting the writeHierarchy parameter to each of its values.

Note

En este ejemplo se muestra cómo usar una de las versiones sobrecargadas de WriteXmlSchema para ver otros ejemplos que podrían estar disponibles, vea los temas de sobrecarga individuales.This example shows how to use one of the overloaded versions of WriteXmlSchema For other examples that might be available, see the individual overload topics.

static void Main()
{
    DataSet ds = new DataSet();
    DataTable customerTable = GetCustomers();
    DataTable orderTable = GetOrders();

    ds.Tables.Add(customerTable);
    ds.Tables.Add(orderTable);
    ds.Relations.Add("CustomerOrder",
        new DataColumn[] { customerTable.Columns[0] },
        new DataColumn[] { orderTable.Columns[1] }, true);

    System.IO.StringWriter writer = new System.IO.StringWriter();
    customerTable.WriteXmlSchema(writer, false);
    PrintOutput(writer, "Customer table, without hierarchy");

    writer = new System.IO.StringWriter();
    customerTable.WriteXmlSchema(writer, true);
    PrintOutput(writer, "Customer table, with hierarchy");

    Console.WriteLine("Press any key to continue.");
    Console.ReadKey();
}

private static DataTable GetCustomers()
{
    // Create sample Customers table, in order
    // to demonstrate the behavior of the DataTableReader.
    DataTable table = new DataTable();

    // Create two columns, ID and Name.
    DataColumn idColumn = table.Columns.Add("ID", typeof(System.Int32));
    table.Columns.Add("Name", typeof(System.String));

    // Set the ID column as the primary key column.
    table.PrimaryKey = new DataColumn[] { idColumn };

    table.Rows.Add(new object[] { 1, "Mary" });
    table.Rows.Add(new object[] { 2, "Andy" });
    table.Rows.Add(new object[] { 3, "Peter" });
    table.Rows.Add(new object[] { 4, "Russ" });
    table.AcceptChanges();
    return table;
}

private static DataTable GetOrders()
{
    // Create sample Customers table, in order
    // to demonstrate the behavior of the DataTableReader.
    DataTable table = new DataTable();

    // Create three columns; OrderID, CustomerID, and OrderDate.
    table.Columns.Add(new DataColumn("OrderID", typeof(System.Int32)));
    table.Columns.Add(new DataColumn("CustomerID", typeof(System.Int32)));
    table.Columns.Add(new DataColumn("OrderDate", typeof(System.DateTime)));

    // Set the OrderID column as the primary key column.
    table.PrimaryKey = new DataColumn[] { table.Columns[0] };

    table.Rows.Add(new object[] { 1, 1, "12/2/2003" });
    table.Rows.Add(new object[] { 2, 1, "1/3/2004" });
    table.Rows.Add(new object[] { 3, 2, "11/13/2004" });
    table.Rows.Add(new object[] { 4, 3, "5/16/2004" });
    table.Rows.Add(new object[] { 5, 3, "5/22/2004" });
    table.Rows.Add(new object[] { 6, 4, "6/15/2004" });
    table.AcceptChanges();
    return table;
}

private static void PrintOutput(System.IO.TextWriter writer,
    string caption)
{
    Console.WriteLine("==============================");
    Console.WriteLine(caption);
    Console.WriteLine("==============================");
    Console.WriteLine(writer.ToString());
}
Sub Main()
  Dim ds As New DataSet
  Dim customerTable As DataTable = GetCustomers()
  Dim orderTable As DataTable = GetOrders()

  ds.Tables.Add(customerTable)
  ds.Tables.Add(orderTable)
  ds.Relations.Add("CustomerOrder", _
   New DataColumn() {customerTable.Columns(0)}, _
   New DataColumn() {orderTable.Columns(1)}, True)

  Dim writer As New System.IO.StringWriter
  customerTable.WriteXmlSchema(writer, False)
  PrintOutput(writer, "Customer table, without hierarchy")

  writer = New System.IO.StringWriter
  customerTable.WriteXmlSchema(writer, True)
  PrintOutput(writer, "Customer table, with hierarchy")

  Console.WriteLine("Press any key to continue.")
  Console.ReadKey()
End Sub

Private Function GetOrders() As DataTable
  ' Create sample Customers table, in order
  ' to demonstrate the behavior of the DataTableReader.
  Dim table As New DataTable

  ' Create three columns, OrderID, CustomerID, and OrderDate.
  table.Columns.Add(New DataColumn("OrderID", GetType(System.Int32)))
  table.Columns.Add(New DataColumn("CustomerID", GetType(System.Int32)))
  table.Columns.Add(New DataColumn("OrderDate", GetType(System.DateTime)))

  ' Set the OrderID column as the primary key column.
  table.PrimaryKey = New DataColumn() {table.Columns(0)}

  table.Rows.Add(New Object() {1, 1, #12/2/2003#})
  table.Rows.Add(New Object() {2, 1, #1/3/2004#})
  table.Rows.Add(New Object() {3, 2, #11/13/2004#})
  table.Rows.Add(New Object() {4, 3, #5/16/2004#})
  table.Rows.Add(New Object() {5, 3, #5/22/2004#})
  table.Rows.Add(New Object() {6, 4, #6/15/2004#})
  table.AcceptChanges()
  Return table
End Function

Private Function GetCustomers() As DataTable
  ' Create sample Customers table, in order
  ' to demonstrate the behavior of the DataTableReader.
  Dim table As New DataTable

  ' Create two columns, ID and Name.
  Dim idColumn As DataColumn = table.Columns.Add("ID", GetType(System.Int32))
  table.Columns.Add("Name", GetType(System.String))

  ' Set the ID column as the primary key column.
  table.PrimaryKey = New DataColumn() {idColumn}

  table.Rows.Add(New Object() {1, "Mary"})
  table.Rows.Add(New Object() {2, "Andy"})
  table.Rows.Add(New Object() {3, "Peter"})
  table.Rows.Add(New Object() {4, "Russ"})
  table.AcceptChanges()
  Return table
End Function

Private Sub PrintOutput( _
   ByVal writer As System.IO.TextWriter, ByVal caption As String)

  Console.WriteLine("==============================")
  Console.WriteLine(caption)
  Console.WriteLine("==============================")
  Console.WriteLine(writer.ToString())
End Sub

En el ejemplo se muestra el siguiente resultado en la ventana de consola:The example displays the following output in the console window:

==============================  
Customer table, without hierarchy  
==============================  
<?xml version="1.0" encoding="utf-16"?>  
<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:MainDataTable="Ta  
ble1">  
    <xs:complexType>  
      <xs:choice minOccurs="0" maxOccurs="unbounded">  
        <xs:element name="Table1">  
          <xs:complexType>  
            <xs:sequence>  
              <xs:element name="ID" type="xs:int" />  
              <xs:element name="Name" type="xs:string" minOccurs="0" />  
            </xs:sequence>  
          </xs:complexType>  
        </xs:element>  
      </xs:choice>  
    </xs:complexType>  
    <xs:unique name="Constraint1" msdata:PrimaryKey="true">  
      <xs:selector xpath=".//Table1" />  
      <xs:field xpath="ID" />  
    </xs:unique>  
  </xs:element>  
</xs:schema>  
==============================  
Customer table, with hierarchy  
==============================  
<?xml version="1.0" encoding="utf-16"?>  
<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:MainDataTable="Table1">  
    <xs:complexType>  
      <xs:choice minOccurs="0" maxOccurs="unbounded">  
        <xs:element name="Table1">  
          <xs:complexType>  
            <xs:sequence>  
              <xs:element name="ID" type="xs:int" />  
              <xs:element name="Name" type="xs:string" minOccurs="0" />  
            </xs:sequence>  
          </xs:complexType>  
        </xs:element>  
        <xs:element name="Table2">  
          <xs:complexType>  
            <xs:sequence>  
              <xs:element name="OrderID" type="xs:int" />  
              <xs:element name="CustomerID" type="xs:int" minOccurs="0" />  
              <xs:element name="OrderDate" type="xs:dateTime" minOccurs="0" />  
            </xs:sequence>  
          </xs:complexType>  
        </xs:element>  
      </xs:choice>  
    </xs:complexType>  
    <xs:unique name="Constraint1" msdata:PrimaryKey="true">  
      <xs:selector xpath=".//Table1" />  
      <xs:field xpath="ID" />  
    </xs:unique>  
    <xs:unique name="Table2_Constraint1" msdata:ConstraintName="Constraint1" msdata:PrimaryKey="true">  
      <xs:selector xpath=".//Table2" />  
      <xs:field xpath="OrderID" />  
    </xs:unique>  
    <xs:keyref name="CustomerOrder" refer="Constraint1">  
      <xs:selector xpath=".//Table2" />  
      <xs:field xpath="CustomerID" />  
    </xs:keyref>  
  </xs:element>  
</xs:schema>  

Remarks

Utilice el método WriteXmlSchema para escribir el esquema de un DataTable en un documento XML.Use the WriteXmlSchema method to write the schema for a DataTable to an XML document. El esquema incluye definiciones de tablas, relaciones y restricciones.The schema includes table, relation, and constraint definitions.

El esquema XML se escribe utilizando el estándar XSD.The XML schema is written using the XSD standard.

Para escribir los datos en un documento XML, utilice el método WriteXml.To write the data to an XML document, use the WriteXml method.

WriteXmlSchema(Stream)

Escribe en la secuencia especificada la estructura de datos actual del objeto DataTable como esquema XML.Writes the current data structure of the DataTable as an XML schema to the specified stream.

public:
 void WriteXmlSchema(System::IO::Stream ^ stream);
public void WriteXmlSchema (System.IO.Stream stream);
member this.WriteXmlSchema : System.IO.Stream -> unit
Public Sub WriteXmlSchema (stream As Stream)

Parameters

stream
Stream

Secuencia en la que se va a escribir el esquema XML.The stream to which the XML schema will be written.

Remarks

Utilice el método WriteXmlSchema para escribir el esquema de un DataTable en un documento XML.Use the WriteXmlSchema method to write the schema for a DataTable to an XML document. El esquema incluye definiciones de tablas, relaciones y restricciones.The schema includes table, relation, and constraint definitions.

El esquema XML se escribe utilizando el estándar XSD.The XML schema is written using the XSD standard.

Para escribir los datos en un documento XML, utilice el método WriteXml.To write the data to an XML document, use the WriteXml method.

See also

WriteXmlSchema(TextWriter)

Escribe la estructura de datos actual del objeto DataTable como esquema XML, utilizando el objeto TextWriter especificado.Writes the current data structure of the DataTable as an XML schema using the specified TextWriter.

public:
 void WriteXmlSchema(System::IO::TextWriter ^ writer);
public void WriteXmlSchema (System.IO.TextWriter writer);
member this.WriteXmlSchema : System.IO.TextWriter -> unit
Public Sub WriteXmlSchema (writer As TextWriter)

Parameters

writer
TextWriter

TextWriter con el que escribir.The TextWriter with which to write.

Remarks

Utilice el método WriteXmlSchema para escribir el esquema de un DataTable en un documento XML.Use the WriteXmlSchema method to write the schema for a DataTable to an XML document. El esquema incluye definiciones de tablas, relaciones y restricciones.The schema includes table, relation, and constraint definitions.

El esquema XML se escribe utilizando el estándar XSD.The XML schema is written using the XSD standard.

Para escribir los datos en un documento XML, utilice el método WriteXml.To write the data to an XML document, use the WriteXml method.

See also

WriteXmlSchema(String)

Escribe en el archivo especificado la estructura de datos actual del objeto DataTable como esquema XML.Writes the current data structure of the DataTable as an XML schema to the specified file.

public:
 void WriteXmlSchema(System::String ^ fileName);
public void WriteXmlSchema (string fileName);
member this.WriteXmlSchema : string -> unit
Public Sub WriteXmlSchema (fileName As String)

Parameters

fileName
String

Nombre del archivo que se va a utilizar.The name of the file to use.

Remarks

Utilice el método WriteXmlSchema para escribir el esquema de un DataTable en un documento XML.Use the WriteXmlSchema method to write the schema for a DataTable to an XML document. El esquema incluye definiciones de tablas, relaciones y restricciones.The schema includes table, relation, and constraint definitions.

El esquema XML se escribe utilizando el estándar XSD.The XML schema is written using the XSD standard.

Para escribir los datos en un documento XML, utilice el método WriteXml.To write the data to an XML document, use the WriteXml method.

See also

WriteXmlSchema(XmlWriter)

Escribe la estructura de datos actual del objeto DataTable como esquema XML, utilizando el objeto XmlWriter especificado.Writes the current data structure of the DataTable as an XML schema using the specified XmlWriter.

public:
 void WriteXmlSchema(System::Xml::XmlWriter ^ writer);
public void WriteXmlSchema (System.Xml.XmlWriter writer);
member this.WriteXmlSchema : System.Xml.XmlWriter -> unit
Public Sub WriteXmlSchema (writer As XmlWriter)

Parameters

writer
XmlWriter

XmlWriter que se va a usar.The XmlWriter to use.

Remarks

Utilice el método WriteXmlSchema para escribir el esquema de un DataTable en un documento XML.Use the WriteXmlSchema method to write the schema for a DataTable to an XML document. El esquema incluye definiciones de tablas, relaciones y restricciones.The schema includes table, relation, and constraint definitions.

El esquema XML se escribe utilizando el estándar XSD.The XML schema is written using the XSD standard.

Para escribir los datos en un documento XML, utilice el método WriteXml.To write the data to an XML document, use the WriteXml method.

See also

WriteXmlSchema(Stream, Boolean)

Escribe en la secuencia especificada la estructura de datos actual del objeto DataTable como esquema XML.Writes the current data structure of the DataTable as an XML schema to the specified stream. Para guardar el esquema de la tabla y de todos sus descendientes, establezca el parámetro writeHierarchy en true.To save the schema for the table and all its descendants, set the writeHierarchy parameter to true.

public:
 void WriteXmlSchema(System::IO::Stream ^ stream, bool writeHierarchy);
public void WriteXmlSchema (System.IO.Stream stream, bool writeHierarchy);
member this.WriteXmlSchema : System.IO.Stream * bool -> unit
Public Sub WriteXmlSchema (stream As Stream, writeHierarchy As Boolean)

Parameters

stream
Stream

Secuencia en la que se va a escribir el esquema XML.The stream to which the XML schema will be written.

writeHierarchy
Boolean

Si es true, escribe el esquema de la tabla actual y de todos sus descendientes.If true, write the schema of the current table and all its descendants. Si es false (valor predeterminado), sólo escribe el esquema de la tabla actual.If false (the default value), write the schema for the current table only.

Remarks

Utilice el método WriteXmlSchema para escribir el esquema de un DataTable en un documento XML.Use the WriteXmlSchema method to write the schema for a DataTable to an XML document. El esquema incluye definiciones de tablas, relaciones y restricciones.The schema includes table, relation, and constraint definitions.

El esquema XML se escribe utilizando el estándar XSD.The XML schema is written using the XSD standard.

Para escribir los datos en un documento XML, utilice el método WriteXml.To write the data to an XML document, use the WriteXml method.

Normalmente, el método WriteXmlSchema escribe el esquema solo para la tabla actual.Normally the WriteXmlSchema method writes the schema only for the current table. Para escribir el esquema de la tabla actual y de todas sus tablas de descendientes relacionadas, llame al método con el parámetro writeHierarchy establecido en true.To write the schema for the current table and its entire descendant, related tables, call the method with the writeHierarchy parameter set to true.

See also

WriteXmlSchema(TextWriter, Boolean)

Escribe la estructura de datos actual del objeto DataTable como esquema XML, utilizando el objeto TextWriter especificado.Writes the current data structure of the DataTable as an XML schema using the specified TextWriter. Para guardar el esquema de la tabla y de todos sus descendientes, establezca el parámetro writeHierarchy en true.To save the schema for the table and all its descendants, set the writeHierarchy parameter to true.

public:
 void WriteXmlSchema(System::IO::TextWriter ^ writer, bool writeHierarchy);
public void WriteXmlSchema (System.IO.TextWriter writer, bool writeHierarchy);
member this.WriteXmlSchema : System.IO.TextWriter * bool -> unit
Public Sub WriteXmlSchema (writer As TextWriter, writeHierarchy As Boolean)

Parameters

writer
TextWriter

TextWriter con el que escribir.The TextWriter with which to write.

writeHierarchy
Boolean

Si es true, escribe el esquema de la tabla actual y de todos sus descendientes.If true, write the schema of the current table and all its descendants. Si es false (valor predeterminado), sólo escribe el esquema de la tabla actual.If false (the default value), write the schema for the current table only.

Examples

La siguiente aplicación de consola crea dos instancias de DataTable, agrega cada una a una DataSet, crea una DataRelation relacionada con las dos tablas y, a continuación, usa el método WriteXmlSchema para escribir los datos contenidos en la tabla primaria en una TextWriter.The following console application creates two DataTable instances, adds each to a DataSet, creates a DataRelation relating the two tables, and then uses the WriteXmlSchema method to write the data contained within the parent table to a TextWriter. En el ejemplo se muestra el comportamiento al establecer el parámetro writeHierarchy en cada uno de sus valores.The example demonstrates the behavior when setting the writeHierarchy parameter to each of its values.

static void Main()
{
    DataSet ds = new DataSet();
    DataTable customerTable = GetCustomers();
    DataTable orderTable = GetOrders();

    ds.Tables.Add(customerTable);
    ds.Tables.Add(orderTable);
    ds.Relations.Add("CustomerOrder",
        new DataColumn[] { customerTable.Columns[0] },
        new DataColumn[] { orderTable.Columns[1] }, true);

    System.IO.StringWriter writer = new System.IO.StringWriter();
    customerTable.WriteXmlSchema(writer, false);
    PrintOutput(writer, "Customer table, without hierarchy");

    writer = new System.IO.StringWriter();
    customerTable.WriteXmlSchema(writer, true);
    PrintOutput(writer, "Customer table, with hierarchy");

    Console.WriteLine("Press any key to continue.");
    Console.ReadKey();
}

private static DataTable GetCustomers()
{
    // Create sample Customers table, in order
    // to demonstrate the behavior of the DataTableReader.
    DataTable table = new DataTable();

    // Create two columns, ID and Name.
    DataColumn idColumn = table.Columns.Add("ID", typeof(System.Int32));
    table.Columns.Add("Name", typeof(System.String));

    // Set the ID column as the primary key column.
    table.PrimaryKey = new DataColumn[] { idColumn };

    table.Rows.Add(new object[] { 1, "Mary" });
    table.Rows.Add(new object[] { 2, "Andy" });
    table.Rows.Add(new object[] { 3, "Peter" });
    table.Rows.Add(new object[] { 4, "Russ" });
    table.AcceptChanges();
    return table;
}

private static DataTable GetOrders()
{
    // Create sample Customers table, in order
    // to demonstrate the behavior of the DataTableReader.
    DataTable table = new DataTable();

    // Create three columns; OrderID, CustomerID, and OrderDate.
    table.Columns.Add(new DataColumn("OrderID", typeof(System.Int32)));
    table.Columns.Add(new DataColumn("CustomerID", typeof(System.Int32)));
    table.Columns.Add(new DataColumn("OrderDate", typeof(System.DateTime)));

    // Set the OrderID column as the primary key column.
    table.PrimaryKey = new DataColumn[] { table.Columns[0] };

    table.Rows.Add(new object[] { 1, 1, "12/2/2003" });
    table.Rows.Add(new object[] { 2, 1, "1/3/2004" });
    table.Rows.Add(new object[] { 3, 2, "11/13/2004" });
    table.Rows.Add(new object[] { 4, 3, "5/16/2004" });
    table.Rows.Add(new object[] { 5, 3, "5/22/2004" });
    table.Rows.Add(new object[] { 6, 4, "6/15/2004" });
    table.AcceptChanges();
    return table;
}

private static void PrintOutput(System.IO.TextWriter writer, string caption)
{
    Console.WriteLine("==============================");
    Console.WriteLine(caption);
    Console.WriteLine("==============================");
    Console.WriteLine(writer.ToString());
}
Sub Main()
  Dim ds As New DataSet
  Dim customerTable As DataTable = GetCustomers()
  Dim orderTable As DataTable = GetOrders()

  ds.Tables.Add(customerTable)
  ds.Tables.Add(orderTable)
  ds.Relations.Add("CustomerOrder", _
   New DataColumn() {customerTable.Columns(0)}, _
   New DataColumn() {orderTable.Columns(1)}, True)

  Dim writer As New System.IO.StringWriter
  customerTable.WriteXmlSchema(writer, False)
  PrintOutput(writer, "Customer table, without hierarchy")

  writer = New System.IO.StringWriter
  customerTable.WriteXmlSchema(writer, True)
  PrintOutput(writer, "Customer table, with hierarchy")

  Console.WriteLine("Press any key to continue.")
  Console.ReadKey()
End Sub

Private Function GetOrders() As DataTable
  ' Create sample Customers table, in order
  ' to demonstrate the behavior of the DataTableReader.
  Dim table As New DataTable

  ' Create three columns, OrderID, CustomerID, and OrderDate.
  table.Columns.Add(New DataColumn("OrderID", GetType(System.Int32)))
  table.Columns.Add(New DataColumn("CustomerID", GetType(System.Int32)))
  table.Columns.Add(New DataColumn("OrderDate", GetType(System.DateTime)))

  ' Set the OrderID column as the primary key column.
  table.PrimaryKey = New DataColumn() {table.Columns(0)}

  table.Rows.Add(New Object() {1, 1, #12/2/2003#})
  table.Rows.Add(New Object() {2, 1, #1/3/2004#})
  table.Rows.Add(New Object() {3, 2, #11/13/2004#})
  table.Rows.Add(New Object() {4, 3, #5/16/2004#})
  table.Rows.Add(New Object() {5, 3, #5/22/2004#})
  table.Rows.Add(New Object() {6, 4, #6/15/2004#})
  table.AcceptChanges()
  Return table
End Function

Private Function GetCustomers() As DataTable
  ' Create sample Customers table, in order
  ' to demonstrate the behavior of the DataTableReader.
  Dim table As New DataTable

  ' Create two columns, ID and Name.
  Dim idColumn As DataColumn = table.Columns.Add("ID", _
      GetType(System.Int32))
  table.Columns.Add("Name", GetType(System.String))

  ' Set the ID column as the primary key column.
  table.PrimaryKey = New DataColumn() {idColumn}

  table.Rows.Add(New Object() {1, "Mary"})
  table.Rows.Add(New Object() {2, "Andy"})
  table.Rows.Add(New Object() {3, "Peter"})
  table.Rows.Add(New Object() {4, "Russ"})
  table.AcceptChanges()
  Return table
End Function

Private Sub PrintOutput( _
   ByVal writer As System.IO.TextWriter, ByVal caption As String)

  Console.WriteLine("==============================")
  Console.WriteLine(caption)
  Console.WriteLine("==============================")
  Console.WriteLine(writer.ToString())
End Sub

En el ejemplo se muestra el siguiente resultado en la ventana de consola:The example displays the following output in the console window:

==============================  
Customer table, without hierarchy  
==============================  
<?xml version="1.0" encoding="utf-16"?>  
<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:MainDataTable="Ta  
ble1">  
    <xs:complexType>  
      <xs:choice minOccurs="0" maxOccurs="unbounded">  
        <xs:element name="Table1">  
          <xs:complexType>  
            <xs:sequence>  
              <xs:element name="ID" type="xs:int" />  
              <xs:element name="Name" type="xs:string" minOccurs="0" />  
            </xs:sequence>  
          </xs:complexType>  
        </xs:element>  
      </xs:choice>  
    </xs:complexType>  
    <xs:unique name="Constraint1" msdata:PrimaryKey="true">  
      <xs:selector xpath=".//Table1" />  
      <xs:field xpath="ID" />  
    </xs:unique>  
  </xs:element>  
</xs:schema>  
==============================  
Customer table, with hierarchy  
==============================  
<?xml version="1.0" encoding="utf-16"?>  
<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:MainDataTable="Table1">  
    <xs:complexType>  
      <xs:choice minOccurs="0" maxOccurs="unbounded">  
        <xs:element name="Table1">  
          <xs:complexType>  
            <xs:sequence>  
              <xs:element name="ID" type="xs:int" />  
              <xs:element name="Name" type="xs:string" minOccurs="0" />  
            </xs:sequence>  
          </xs:complexType>  
        </xs:element>  
        <xs:element name="Table2">  
          <xs:complexType>  
            <xs:sequence>  
              <xs:element name="OrderID" type="xs:int" />  
              <xs:element name="CustomerID" type="xs:int" minOccurs="0" />  
              <xs:element name="OrderDate" type="xs:dateTime" minOccurs="0" />  
            </xs:sequence>  
          </xs:complexType>  
        </xs:element>  
      </xs:choice>  
    </xs:complexType>  
    <xs:unique name="Constraint1" msdata:PrimaryKey="true">  
      <xs:selector xpath=".//Table1" />  
      <xs:field xpath="ID" />  
    </xs:unique>  
    <xs:unique name="Table2_Constraint1" msdata:ConstraintName="Constraint1" msdata:PrimaryKey="true">  
      <xs:selector xpath=".//Table2" />  
      <xs:field xpath="OrderID" />  
    </xs:unique>  
    <xs:keyref name="CustomerOrder" refer="Constraint1">  
      <xs:selector xpath=".//Table2" />  
      <xs:field xpath="CustomerID" />  
    </xs:keyref>  
  </xs:element>  
</xs:schema>  

Remarks

Utilice el método WriteXmlSchema para escribir el esquema de un DataTable en un documento XML.Use the WriteXmlSchema method to write the schema for a DataTable to an XML document. El esquema incluye definiciones de tablas, relaciones y restricciones.The schema includes table, relation, and constraint definitions.

El esquema XML se escribe utilizando el estándar XSD.The XML schema is written using the XSD standard.

Para escribir los datos en un documento XML, utilice el método WriteXml.To write the data to an XML document, use the WriteXml method.

Normalmente, el método WriteXmlSchema escribe el esquema solo para la tabla actual.Normally the WriteXmlSchema method writes the schema only for the current table. Para escribir el esquema de la tabla actual y de todas sus tablas de descendientes relacionadas, llame al método con el parámetro writeHierarchy establecido en true.To write the schema for the current table and its entire descendant, related tables, call the method with the writeHierarchy parameter set to true.

See also

WriteXmlSchema(XmlWriter, Boolean)

Escribe la estructura de datos actual del objeto DataTable como esquema XML, utilizando el objeto XmlWriter especificado.Writes the current data structure of the DataTable as an XML schema using the specified XmlWriter. Para guardar el esquema de la tabla y de todos sus descendientes, establezca el parámetro writeHierarchy en true.To save the schema for the table and all its descendants, set the writeHierarchy parameter to true.

public:
 void WriteXmlSchema(System::Xml::XmlWriter ^ writer, bool writeHierarchy);
public void WriteXmlSchema (System.Xml.XmlWriter writer, bool writeHierarchy);
member this.WriteXmlSchema : System.Xml.XmlWriter * bool -> unit
Public Sub WriteXmlSchema (writer As XmlWriter, writeHierarchy As Boolean)

Parameters

writer
XmlWriter

Objeto XmlWriter que se utiliza para escribir el documento.The XmlWriter used to write the document.

writeHierarchy
Boolean

Si es true, escribe el esquema de la tabla actual y de todos sus descendientes.If true, write the schema of the current table and all its descendants. Si es false (valor predeterminado), sólo escribe el esquema de la tabla actual.If false (the default value), write the schema for the current table only.

Remarks

Utilice el método WriteXmlSchema para escribir el esquema de un DataTable en un documento XML.Use the WriteXmlSchema method to write the schema for a DataTable to an XML document. El esquema incluye definiciones de tablas, relaciones y restricciones.The schema includes table, relation, and constraint definitions.

El esquema XML se escribe utilizando el estándar XSD.The XML schema is written using the XSD standard.

Para escribir los datos en un documento XML, utilice el método WriteXml.To write the data to an XML document, use the WriteXml method.

Normalmente, el método WriteXmlSchema escribe el esquema solo para la tabla actual.Normally the WriteXmlSchema method writes the schema only for the current table. Para escribir el esquema de la tabla actual y de todas sus tablas de descendientes relacionadas, llame al método con el parámetro writeHierarchy establecido en true.To write the schema for the current table and its entire descendant, related tables, call the method with the writeHierarchy parameter set to true.

See also

WriteXmlSchema(String, Boolean)

Escribe en el archivo especificado la estructura de datos actual del objeto DataTable como esquema XML.Writes the current data structure of the DataTable as an XML schema to the specified file. Para guardar el esquema de la tabla y de todos sus descendientes, establezca el parámetro writeHierarchy en true.To save the schema for the table and all its descendants, set the writeHierarchy parameter to true.

public:
 void WriteXmlSchema(System::String ^ fileName, bool writeHierarchy);
public void WriteXmlSchema (string fileName, bool writeHierarchy);
member this.WriteXmlSchema : string * bool -> unit
Public Sub WriteXmlSchema (fileName As String, writeHierarchy As Boolean)

Parameters

fileName
String

Nombre del archivo que se va a utilizar.The name of the file to use.

writeHierarchy
Boolean

Si es true, escribe el esquema de la tabla actual y de todos sus descendientes.If true, write the schema of the current table and all its descendants. Si es false (valor predeterminado), sólo escribe el esquema de la tabla actual.If false (the default value), write the schema for the current table only.

Remarks

Utilice el método WriteXmlSchema para escribir el esquema de un DataTable en un documento XML.Use the WriteXmlSchema method to write the schema for a DataTable to an XML document. El esquema incluye definiciones de tablas, relaciones y restricciones.The schema includes table, relation, and constraint definitions.

El esquema XML se escribe utilizando el estándar XSD.The XML schema is written using the XSD standard.

Para escribir los datos en un documento XML, utilice el método WriteXml.To write the data to an XML document, use the WriteXml method.

Normalmente, el método WriteXmlSchema escribe el esquema solo para la tabla actual.Normally the WriteXmlSchema method writes the schema only for the current table. Para escribir el esquema de la tabla actual y de todas sus tablas de descendientes relacionadas, llame al método con el parámetro writeHierarchy establecido en true.To write the schema for the current table and its entire descendant, related tables, call the method with the writeHierarchy parameter set to true.

See also

Applies to