DataSet.WriteXml 方法

定义

DataSet 写 XML 数据,还可以选择写架构。Writes XML data, and optionally the schema, from the DataSet.

重载

WriteXml(XmlWriter, XmlWriteMode)

使用指定的 DataSetXmlWriter 写入 XmlWriteMode 的当前数据和架构(可选)。Writes the current data, and optionally the schema, for the DataSet using the specified XmlWriter and XmlWriteMode. 若要写入架构,请将 mode 参数的值设置为 WriteSchemaTo write the schema, set the value for the mode parameter to WriteSchema.

WriteXml(String, XmlWriteMode)

使用指定的 DataSetXmlWriteMode 的当前数据和架构(可选)写入指定的文件。Writes the current data, and optionally the schema, for the DataSet to the specified file using the specified XmlWriteMode. 若要写入架构,请将 mode 参数的值设置为 WriteSchemaTo write the schema, set the value for the mode parameter to WriteSchema.

WriteXml(TextWriter, XmlWriteMode)

使用指定的 DataSetTextWriter 写入 XmlWriteMode 的当前数据和架构(可选)。Writes the current data, and optionally the schema, for the DataSet using the specified TextWriter and XmlWriteMode. 若要写入架构,请将 mode 参数的值设置为 WriteSchemaTo write the schema, set the value for the mode parameter to WriteSchema.

WriteXml(Stream, XmlWriteMode)

使用指定的 DataSetStream 写入 XmlWriteMode 的当前数据和架构(可选)。Writes the current data, and optionally the schema, for the DataSet using the specified Stream and XmlWriteMode. 若要写入架构,请将 mode 参数的值设置为 WriteSchemaTo write the schema, set the value for the mode parameter to WriteSchema.

WriteXml(String)

DataSet 的当前数据写入指定的文件。Writes the current data for the DataSet to the specified file.

WriteXml(TextWriter)

使用指定的 DataSetTextWriter 写当前数据。Writes the current data for the DataSet using the specified TextWriter.

WriteXml(XmlWriter)

DataSet 的当前数据写入指定的 XmlWriterWrites the current data for the DataSet to the specified XmlWriter.

WriteXml(Stream)

使用指定的 DataSetStream 写当前数据。Writes the current data for the DataSet using the specified Stream.

WriteXml(XmlWriter, XmlWriteMode)

使用指定的 DataSetXmlWriter 写入 XmlWriteMode 的当前数据和架构(可选)。Writes the current data, and optionally the schema, for the DataSet using the specified XmlWriter and XmlWriteMode. 若要写入架构,请将 mode 参数的值设置为 WriteSchemaTo write the schema, set the value for the mode parameter to WriteSchema.

public:
 void WriteXml(System::Xml::XmlWriter ^ writer, System::Data::XmlWriteMode mode);
public void WriteXml (System.Xml.XmlWriter writer, System.Data.XmlWriteMode mode);
member this.WriteXml : System.Xml.XmlWriter * System.Data.XmlWriteMode -> unit
Public Sub WriteXml (writer As XmlWriter, mode As XmlWriteMode)

参数

writer
XmlWriter

用于写入的 XmlWriterThe XmlWriter with which to write.

mode
XmlWriteMode

XmlWriteMode 值之一。One of the XmlWriteMode values.

示例

下面的示例创建一个用于创建新 XmlTextWriterSystem.IO.FileStream 对象。The following example creates a System.IO.FileStream object that is used to create a new XmlTextWriter. XmlTextWriter 对象与 WriteXml 方法一起用于写入 XML 文档。The XmlTextWriter object is used with the WriteXml method to write an XML document.

private void WriteXmlToFile(DataSet thisDataSet) 
{
    if (thisDataSet == null) { return; }

    // Create a file name to write to.
    string filename = "XmlDoc.xml";

    // Create the FileStream to write with.
    System.IO.FileStream stream = new System.IO.FileStream
        (filename, System.IO.FileMode.Create);

    // Create an XmlTextWriter with the fileStream.
    System.Xml.XmlTextWriter xmlWriter = 
        new System.Xml.XmlTextWriter(stream, 
        System.Text.Encoding.Unicode);

    // Write to the file with the WriteXml method.
    thisDataSet.WriteXml(xmlWriter);   
    xmlWriter.Close();
}
Private Sub WriteXmlToFile(thisDataSet As DataSet)
    If thisDataSet Is Nothing Then
        Return
    End If

    ' Create a file name to write to.
    Dim filename As String = "XmlDoc.xml"

    ' Create the FileStream to write with.
    Dim stream As New System.IO.FileStream _
       (filename, System.IO.FileMode.Create)

    ' Create an XmlTextWriter with the fileStream.
    Dim xmlWriter As New System.Xml.XmlTextWriter _
       (stream, System.Text.Encoding.Unicode)

    ' Write to the file with the WriteXml method.
    thisDataSet.WriteXml(xmlWriter)
    xmlWriter.Close()
End Sub

注解

WriteXml 方法提供一种方法,用于将数据(或从 DataSet 中的数据和架构)写入 XML 文档,而 WriteXmlSchema 方法只写入架构。The WriteXml method provides a way to write either data only, or both data and schema from a DataSet into an XML document, whereas the WriteXmlSchema method writes only the schema. 若要同时编写数据和架构,请将 mode 参数设置为 WriteSchemaTo write both data and schema, set the mode parameter to WriteSchema.

请注意,ReadXmlReadXmlSchema 方法的情况都是相同的。Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. 若要将 XML 数据或架构和数据都读入到 DataSet,请使用 ReadXml 方法。To read XML data, or both schema and data into the DataSet, use the ReadXml method. 若要仅读取架构,请使用 ReadXmlSchema 方法。To read just the schema, use the ReadXmlSchema method.

备注

如果读取或写入 DataRow 中的列类型以实现 IDynamicMetaObjectProvider 但未实现 IXmlSerializable,则会引发 InvalidOperationExceptionAn InvalidOperationException will be thrown if a column type in the DataRow being read from or written to implements IDynamicMetaObjectProvider and does not implement IXmlSerializable.

另请参阅

WriteXml(String, XmlWriteMode)

使用指定的 DataSetXmlWriteMode 的当前数据和架构(可选)写入指定的文件。Writes the current data, and optionally the schema, for the DataSet to the specified file using the specified XmlWriteMode. 若要写入架构,请将 mode 参数的值设置为 WriteSchemaTo write the schema, set the value for the mode parameter to WriteSchema.

public:
 void WriteXml(System::String ^ fileName, System::Data::XmlWriteMode mode);
public void WriteXml (string fileName, System.Data.XmlWriteMode mode);
member this.WriteXml : string * System.Data.XmlWriteMode -> unit
Public Sub WriteXml (fileName As String, mode As XmlWriteMode)

参数

fileName
String

要向其写入的文件的名称(包括路径)。The file name (including the path) to which to write.

mode
XmlWriteMode

XmlWriteMode 值之一。One of the XmlWriteMode values.

异常

示例

下面的示例使用 WriteXml 方法来编写 XML 文档。The following example uses the WriteXml method to write an XML document.

private void WriteXmlToFile(DataSet thisDataSet) 
{
    if (thisDataSet == null) { return; }

    // Create a file name to write to.
    string filename = "XmlDoc.xml";

    // Write to the file with the WriteXml method.
    thisDataSet.WriteXml(filename);
}
Private Sub WriteXmlToFile(thisDataSet As DataSet)
    If thisDataSet Is Nothing Then
        Return
    End If

    ' Create a file name to write to.
    Dim filename As String = "XmlDoc.xml"

    ' Write to the file with the WriteXml method.
    thisDataSet.WriteXml(filename)
End Sub

注解

WriteXml 方法提供一种方法,用于将数据(或从 DataSet 中的数据和架构)写入 XML 文档,而 WriteXmlSchema 方法只写入架构。The WriteXml method provides a way to write either data only, or both data and schema from a DataSet into an XML document, whereas the WriteXmlSchema method writes only the schema. 若要同时编写数据和架构,请将 mode 参数设置为 WriteSchemaTo write both data and schema, set the mode parameter to WriteSchema.

请注意,ReadXmlReadXmlSchema 方法的情况都是相同的。Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. 若要将 XML 数据或架构和数据都读入到 DataSet,请使用 ReadXml 方法。To read XML data, or both schema and data into the DataSet, use the ReadXml method. 若要仅读取架构,请使用 ReadXmlSchema 方法。To read just the schema, use the ReadXmlSchema method.

备注

如果读取或写入 DataRow 中的列类型以实现 IDynamicMetaObjectProvider 但未实现 IXmlSerializable,则会引发 InvalidOperationExceptionAn InvalidOperationException will be thrown if a column type in the DataRow being read from or written to implements IDynamicMetaObjectProvider and does not implement IXmlSerializable.

安全性

FileIOPermission
用于读取和写入文件。for reading and writing files. 关联的枚举: FileIOPermissionAccessAssociated enumeration: FileIOPermissionAccess

另请参阅

WriteXml(TextWriter, XmlWriteMode)

使用指定的 DataSetTextWriter 写入 XmlWriteMode 的当前数据和架构(可选)。Writes the current data, and optionally the schema, for the DataSet using the specified TextWriter and XmlWriteMode. 若要写入架构,请将 mode 参数的值设置为 WriteSchemaTo write the schema, set the value for the mode parameter to WriteSchema.

public:
 void WriteXml(System::IO::TextWriter ^ writer, System::Data::XmlWriteMode mode);
public void WriteXml (System.IO.TextWriter writer, System.Data.XmlWriteMode mode);
member this.WriteXml : System.IO.TextWriter * System.Data.XmlWriteMode -> unit
Public Sub WriteXml (writer As TextWriter, mode As XmlWriteMode)

参数

writer
TextWriter

TextWriter 对象用于写文档。A TextWriter object used to write the document.

mode
XmlWriteMode

XmlWriteMode 值之一。One of the XmlWriteMode values.

示例

下面的示例首先创建一个简单的 DataSet,其中包含一个 DataTable、两列和10行。The following example first creates a simple DataSet with one DataTable, two columns, and ten rows. 通过调用 WriteXml 方法将 DataSet 架构和数据写入磁盘。The DataSet schema and data are written to disk by invoking the WriteXml method. 将创建第二个 DataSet,并使用 ReadXml 方法来填充架构和数据。A second DataSet is created and the ReadXml method is used to fill it with schema and data.

   private void DemonstrateReadWriteXMLDocumentWithFileStream()
   {
       // Create a DataSet with one table and two columns.
       DataSet originalDataSet = new DataSet("dataSet");
       DataTable table = new DataTable("table");
       DataColumn idColumn = new DataColumn("id", 
           Type.GetType("System.Int32"));
       idColumn.AutoIncrement= true;

       DataColumn itemColumn = new DataColumn("item");
       table.Columns.Add(idColumn);
       table.Columns.Add(itemColumn);
       originalDataSet.Tables.Add(table);
       // Add ten rows.

       DataRow newRow;
       for(int i = 0; i < 10; i++)
       {
           newRow = table.NewRow();
           newRow["item"]= "item " + i;
           table.Rows.Add(newRow);
       }
       originalDataSet.AcceptChanges();

       // Print out values of each table in the DataSet  
       // using the function defined below.
       PrintValues(originalDataSet, "Original DataSet");

       // Write the schema and data to XML file with FileStream.
       string xmlFilename = "XmlDocument.xml";
       System.IO.FileStream streamWrite = new System.IO.FileStream
           (xmlFilename, System.IO.FileMode.Create);

       // Use WriteXml to write the XML document.
       originalDataSet.WriteXml(streamWrite);

       // Close the FileStream.
       streamWrite.Close();
      
       // Dispose of the original DataSet.
       originalDataSet.Dispose();
       // Create a new DataSet.
       DataSet newDataSet = new DataSet("New DataSet");
      
       // Read the XML document back in. 
       // Create new FileStream to read schema with.
       System.IO.FileStream streamRead = new System.IO.FileStream
           (xmlFilename,System.IO.FileMode.Open);
       newDataSet.ReadXml(streamRead);

       // Print out values of each table in the DataSet 
       // using the function defined below.
       PrintValues(newDataSet,"New DataSet");
   }

   private void PrintValues(DataSet dataSet, string label)
   {
       Console.WriteLine("\n" + label);
       foreach(DataTable table in dataSet.Tables)
       {
           Console.WriteLine("TableName: " + table.TableName);
           foreach(DataRow row in table.Rows)
           {
               foreach(DataColumn column in table.Columns)
               {
                   Console.Write("\table " + row[column] );
               }
               Console.WriteLine();
           }
       }
   }
Private Sub DemonstrateReadWriteXMLDocumentWithFileStream()
    ' Create a DataSet with one table and two columns.
    Dim originalDataSet As New DataSet("dataSet")
    Dim table As New DataTable("table")
    Dim idColumn As New DataColumn("id", _
       Type.GetType("System.Int32"))
    idColumn.AutoIncrement = True

    Dim itemColumn As New DataColumn("item")
    table.Columns.Add(idColumn)
    table.Columns.Add(itemColumn)
    originalDataSet.Tables.Add(table)

    ' Add ten rows.
    Dim newRow As DataRow
    Dim i As Integer
    For i = 0 To 9
        newRow = table.NewRow()
        newRow("item") = "item " & i.ToString()
        table.Rows.Add(newRow)
    Next i
    originalDataSet.AcceptChanges()

    ' Print out values of each table in the DataSet 
    ' using the function defined below.
    PrintValues(originalDataSet, "Original DataSet")

    ' Write the schema and data to XML file with FileStream.
    Dim xmlFilename As String = "XmlDocument.xml"
    Dim streamWrite As New System.IO.FileStream _
       (xmlFilename, System.IO.FileMode.Create)

    ' Use WriteXml to write the XML document.
    originalDataSet.WriteXml(streamWrite)

    ' Close the FileStream.
    streamWrite.Close()
     
    ' Dispose of the original DataSet.
    originalDataSet.Dispose()
    ' Create a new DataSet.
    Dim newDataSet As New DataSet("New DataSet")
       
    ' Read the XML document back in. 
    ' Create new FileStream to read schema with.
    Dim streamRead As New System.IO.FileStream _
       (xmlFilename, System.IO.FileMode.Open)
     
    newDataSet.ReadXml(streamRead)
    ' Print out values of each table in the DataSet  
    ' using the function defined below.
    PrintValues(newDataSet, "New DataSet")
End Sub
   
Private Sub PrintValues(dataSet As DataSet, label As String)
    Console.WriteLine(ControlChars.Cr & label)
    Dim table As DataTable
    Dim row As DataRow
    Dim column As DataColumn
    For Each table In  dataSet.Tables
        Console.WriteLine("TableName: " & table.TableName)         
        For Each row In  table.Rows             
            For Each column In  table.Columns
                Console.Write(ControlChars.Tab & " " & _
                   row(column).ToString())
            Next column
            Console.WriteLine()
        Next row
    Next table
End Sub

注解

WriteXml 方法提供一种方法,用于将数据(或从 DataSet 中的数据和架构)写入 XML 文档,而 WriteXmlSchema 方法只写入架构。The WriteXml method provides a way to write either data only, or both data and schema from a DataSet into an XML document, whereas the WriteXmlSchema method writes only the schema. 若要同时编写数据和架构,请将 mode 参数设置为 WriteSchemaTo write both data and schema, set the mode parameter to WriteSchema.

请注意,ReadXmlReadXmlSchema 方法的情况都是相同的。Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. 若要将 XML 数据或架构和数据都读入到 DataSet,请使用 ReadXml 方法。To read XML data, or both schema and data into the DataSet, use the ReadXml method. 若要仅读取架构,请使用 ReadXmlSchema 方法。To read just the schema, use the ReadXmlSchema method.

备注

如果读取或写入 DataRow 中的列类型以实现 IDynamicMetaObjectProvider 但未实现 IXmlSerializable,则会引发 InvalidOperationExceptionAn InvalidOperationException will be thrown if a column type in the DataRow being read from or written to implements IDynamicMetaObjectProvider and does not implement IXmlSerializable.

另请参阅

WriteXml(Stream, XmlWriteMode)

使用指定的 DataSetStream 写入 XmlWriteMode 的当前数据和架构(可选)。Writes the current data, and optionally the schema, for the DataSet using the specified Stream and XmlWriteMode. 若要写入架构,请将 mode 参数的值设置为 WriteSchemaTo write the schema, set the value for the mode parameter to WriteSchema.

public:
 void WriteXml(System::IO::Stream ^ stream, System::Data::XmlWriteMode mode);
public void WriteXml (System.IO.Stream stream, System.Data.XmlWriteMode mode);
member this.WriteXml : System.IO.Stream * System.Data.XmlWriteMode -> unit

参数

stream
Stream

用于写入文件的 Stream 对象。A Stream object used to write to a file.

mode
XmlWriteMode

XmlWriteMode 值之一。One of the XmlWriteMode values.

注解

WriteXml 方法提供一种方法,用于将数据(或从 DataSet 中的数据和架构)写入 XML 文档,而 WriteXmlSchema 方法只写入架构。The WriteXml method provides a way to write either data only, or both data and schema from a DataSet into an XML document, whereas the WriteXmlSchema method writes only the schema. 若要同时编写数据和架构,请将 mode 参数设置为 WriteSchemaTo write both data and schema, set the mode parameter to WriteSchema.

请注意,ReadXmlReadXmlSchema 方法的情况都是相同的。Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. 若要将 XML 数据或架构和数据都读入到 DataSet,请使用 ReadXml 方法。To read XML data, or both schema and data into the DataSet, use the ReadXml method. 若要仅读取架构,请使用 ReadXmlSchema 方法。To read just the schema, use the ReadXmlSchema method.

备注

如果读取或写入 DataRow 中的列类型以实现 IDynamicMetaObjectProvider 但未实现 IXmlSerializable,则会引发 InvalidOperationExceptionAn InvalidOperationException will be thrown if a column type in the DataRow being read from or written to implements IDynamicMetaObjectProvider and does not implement IXmlSerializable.

另请参阅

WriteXml(String)

DataSet 的当前数据写入指定的文件。Writes the current data for the DataSet to the specified file.

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

参数

fileName
String

要向其写入的文件的名称(包括路径)。The file name (including the path) to which to write.

异常

注解

WriteXml 方法提供一种方法,用于将数据(或从 DataSet 中的数据和架构)写入 XML 文档,而 WriteXmlSchema 方法只写入架构。The WriteXml method provides a way to write either data only, or both data and schema from a DataSet into an XML document, whereas the WriteXmlSchema method writes only the schema. 若要同时编写数据和架构,请使用包含 mode 参数的重载之一,并将其值设置为 WriteSchemaTo write both data and schema, use one of the overloads that includes the mode parameter, and set its value to WriteSchema.

请注意,ReadXmlReadXmlSchema 方法的情况都是相同的。Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. 若要将 XML 数据或架构和数据都读入到 DataSet,请使用 ReadXml 方法。To read XML data, or both schema and data into the DataSet, use the ReadXml method. 若要仅读取架构,请使用 ReadXmlSchema 方法。To read just the schema, use the ReadXmlSchema method.

备注

如果读取或写入 DataRow 中的列类型以实现 IDynamicMetaObjectProvider 但未实现 IXmlSerializable,则会引发 InvalidOperationExceptionAn InvalidOperationException will be thrown if a column type in the DataRow being read from or written to implements IDynamicMetaObjectProvider and does not implement IXmlSerializable.

安全性

FileIOPermission
用于读取和写入文件。for reading and writing files. 关联的枚举: FileIOPermissionAccessAssociated enumeration: FileIOPermissionAccess

另请参阅

WriteXml(TextWriter)

使用指定的 DataSetTextWriter 写当前数据。Writes the current data for the DataSet using the specified TextWriter.

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

参数

writer
TextWriter

要进行写入的 TextWriter 对象。The TextWriter object with which to write.

注解

WriteXml 方法提供一种方法,用于将数据(或从 DataSet 中的数据和架构)写入 XML 文档,而 WriteXmlSchema 方法只写入架构。The WriteXml method provides a way to write either data only, or both data and schema from a DataSet into an XML document, whereas the WriteXmlSchema method writes only the schema. 若要同时编写数据和架构,请使用包含 mode 参数的重载之一,并将其值设置为 WriteSchemaTo write both data and schema, use one of the overloads that includes the mode parameter, and set its value to WriteSchema.

请注意,ReadXmlReadXmlSchema 方法的情况都是相同的。Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. 若要将 XML 数据或架构和数据都读入到 DataSet,请使用 ReadXml 方法。To read XML data, or both schema and data into the DataSet, use the ReadXml method. 若要仅读取架构,请使用 ReadXmlSchema 方法。To read just the schema, use the ReadXmlSchema method.

备注

如果读取或写入 DataRow 中的列类型以实现 IDynamicMetaObjectProvider 但未实现 IXmlSerializable,则会引发 InvalidOperationExceptionAn InvalidOperationException will be thrown if a column type in the DataRow being read from or written to implements IDynamicMetaObjectProvider and does not implement IXmlSerializable.

另请参阅

WriteXml(XmlWriter)

DataSet 的当前数据写入指定的 XmlWriterWrites the current data for the DataSet to the specified XmlWriter.

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

参数

writer
XmlWriter

用于写入的 XmlWriterThe XmlWriter with which to write.

实现

注解

WriteXml 方法提供一种方法,用于将数据(或从 DataSet 中的数据和架构)写入 XML 文档,而 WriteXmlSchema 方法只写入架构。The WriteXml method provides a way to write either data only, or both data and schema from a DataSet into an XML document, whereas the WriteXmlSchema method writes only the schema. 若要同时编写数据和架构,请使用包含 mode 参数的重载之一,并将其值设置为 WriteSchemaTo write both data and schema, use one of the overloads that includes the mode parameter, and set its value to WriteSchema.

请注意,ReadXmlReadXmlSchema 方法的情况都是相同的。Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. 若要将 XML 数据或架构和数据都读入到 DataSet,请使用 ReadXml 方法。To read XML data, or both schema and data into the DataSet, use the ReadXml method. 若要仅读取架构,请使用 ReadXmlSchema 方法。To read just the schema, use the ReadXmlSchema method.

备注

如果读取或写入 DataRow 中的列类型以实现 IDynamicMetaObjectProvider 但未实现 IXmlSerializable,则会引发 InvalidOperationExceptionAn InvalidOperationException will be thrown if a column type in the DataRow being read from or written to implements IDynamicMetaObjectProvider and does not implement IXmlSerializable.

另请参阅

WriteXml(Stream)

使用指定的 DataSetStream 写当前数据。Writes the current data for the DataSet using the specified Stream.

public:
 void WriteXml(System::IO::Stream ^ stream);
public void WriteXml (System.IO.Stream stream);
member this.WriteXml : System.IO.Stream -> unit

参数

stream
Stream

用于写入文件的 Stream 对象。A Stream object used to write to a file.

示例

下面的示例创建一个 System.IO.FileStream 对象。The following example creates a System.IO.FileStream object. 然后,将对象与 WriteXml 方法一起使用以写入 XML 文档。The object is then used with the WriteXml method to write an XML document.

private void WriteXmlToFile(DataSet thisDataSet) 
{
    if (thisDataSet == null) { return; }

    // Create a file name to write to.
    string filename = "XmlDoc.xml";

    // Create the FileStream to write with.
    System.IO.FileStream stream = new System.IO.FileStream
        (filename, System.IO.FileMode.Create);

    // Write to the file with the WriteXml method.
    thisDataSet.WriteXml(stream);   
}
Private Sub WriteXmlToFile(thisDataSet As DataSet)
     If thisDataSet Is Nothing Then
         Return
     End If 

    ' Create a file name to write to.
     Dim filename As String = "XmlDoc.xml"

     ' Create the FileStream to write with.
     Dim stream As New System.IO.FileStream _
        (filename, System.IO.FileMode.Create)

     ' Write to the file with the WriteXml method.
     thisDataSet.WriteXml(stream)
End Sub

注解

WriteXml 方法提供一种方法,用于将数据(或从 DataSet 中的数据和架构)写入 XML 文档,而 WriteXmlSchema 方法只写入架构。The WriteXml method provides a way to write either data only, or both data and schema from a DataSet into an XML document, whereas the WriteXmlSchema method writes only the schema. 若要同时编写数据和架构,请使用包含 mode 参数的重载之一,并将其值设置为 WriteSchemaTo write both data and schema, use one of the overloads that includes the mode parameter, and set its value to WriteSchema.

请注意,ReadXmlReadXmlSchema 方法的情况都是相同的。Note that the same is true for the ReadXml and ReadXmlSchema methods, respectively. 若要将 XML 数据或架构和数据都读入到 DataSet,请使用 ReadXml 方法。To read XML data, or both schema and data into the DataSet, use the ReadXml method. 若要仅读取架构,请使用 ReadXmlSchema 方法。To read just the schema, use the ReadXmlSchema method.

备注

如果读取或写入 DataRow 中的列类型以实现 IDynamicMetaObjectProvider 但未实现 IXmlSerializable,则会引发 InvalidOperationExceptionAn InvalidOperationException will be thrown if a column type in the DataRow being read from or written to implements IDynamicMetaObjectProvider and does not implement IXmlSerializable.

另请参阅

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