แก้ไข

แชร์ผ่าน

XmlTextReader.ResetState Method

  • Reference

Definition

Namespace:
System.Xml
Assembly:
System.Xml.ReaderWriter.dll
Assembly:
System.Xml.dll
Assembly:
netstandard.dll
Source:
XmlTextReader.cs
Source:
XmlTextReader.cs
Source:
XmlTextReader.cs

Resets the state of the reader to ReadState.Initial.

public:
 void ResetState();
public void ResetState ();
member this.ResetState : unit -> unit
Public Sub ResetState ()

Exceptions

InvalidOperationException

Calling ResetState if the reader was constructed using an XmlParserContext.

XmlException

Documents in a single stream do not share the same encoding.

Examples

The following example parses two XML documents in a single stream.

#using <System.Xml.dll>

using namespace System;
using namespace System::IO;
using namespace System::Text;
using namespace System::Xml;
int main()
{
   Encoding^ enc = gcnew UTF8Encoding;
   array<Byte>^utf8Buffer = enc->GetBytes( "<root> 12345 </root>" );
   enc = gcnew UnicodeEncoding;
   array<Byte>^unicodeBuffer = enc->GetBytes( "<?xml version='1.0' ?><unicode> root </unicode>" );
   MemoryStream^ memStrm = gcnew MemoryStream;
   memStrm->Write( unicodeBuffer, 0, unicodeBuffer->Length );
   memStrm->Write( utf8Buffer, 0, utf8Buffer->Length );
   memStrm->Position = 0;
   XmlTextReader^ reader = gcnew XmlTextReader( memStrm );
   while ( reader->Read() )
   {
      Console::WriteLine( "NodeType: {0}", reader->NodeType );
      if ( XmlNodeType::EndElement == reader->NodeType && "root" == reader->Name )
            break;
      if ( XmlNodeType::EndElement == reader->NodeType )
            reader->ResetState();
   }
}

using System;
using System.IO;
using System.Text;
using System.Xml;

public class Sample
{
  public static void Main(){

     Encoding enc = new UTF8Encoding();
     byte[] utf8Buffer = enc.GetBytes("<root> 12345 </root>");

     enc = new UnicodeEncoding();
     byte[] unicodeBuffer = enc.GetBytes("<?xml version='1.0' ?><unicode> root </unicode>");

     MemoryStream memStrm = new MemoryStream();
     memStrm.Write(unicodeBuffer, 0, unicodeBuffer.Length);
     memStrm.Write(utf8Buffer, 0, utf8Buffer.Length);
     memStrm.Position = 0;

     XmlTextReader reader = new XmlTextReader(memStrm);

     while(reader.Read()) {
        Console.WriteLine("NodeType: {0}", reader.NodeType);
        if (XmlNodeType.EndElement == reader.NodeType && "root" == reader.Name) {
          break;
        }

        if (XmlNodeType.EndElement == reader.NodeType) {
          reader.ResetState();
       }
    }
  }
}

Imports System.IO
Imports System.Text
Imports System.Xml

public class Sample

  public shared sub Main()

     Dim enc as Encoding = new UTF8Encoding()
     Dim utf8Buffer as byte() = enc.GetBytes("<root> 12345 </root>") 

     enc = new UnicodeEncoding()
     Dim unicodeBuffer as byte() = enc.GetBytes("<?xml version='1.0' ?><unicode> root </unicode>")

     Dim memSreaderm as MemoryStream = new MemoryStream()
     memSreaderm.Write(unicodeBuffer, 0, unicodeBuffer.Length)
     memSreaderm.Write(utf8Buffer, 0, utf8Buffer.Length)
     memSreaderm.Position = 0

     Dim reader as XmlTextReader = new XmlTextReader(memSreaderm)

     while(reader.Read()) 
        Console.WriteLine("NodeType: {0}", reader.NodeType)
        if (XmlNodeType.EndElement = reader.NodeType And "root" = reader.Name) 
         exit while
        end if
        
        if (XmlNodeType.EndElement = reader.NodeType) 
          reader.ResetState()
       end if
    end while

  end sub
end class

Remarks

Note

Starting with the .NET Framework 2.0, we recommend that you create XmlReader instances by using the XmlReader.Create method to take advantage of new functionality.

This method enables you to parse multiple XML documents in a single stream. When you reach the end of an XML document, you can call ResetState to reset the state of the reader in preparation for the next XML document.

Important

The documents in the stream must share the same encoding. If this is not the case, when ResetState is called an XmlException is thrown. (This is a change in behavior from .NET Framework version 1.1 and earlier).

The following properties are not affected by ResetState.

Applies to

See also