WebMethodAttribute.BufferResponse 属性

定义

获取或设置是否缓存该请求的响应。Gets or sets whether the response for this request is buffered.

public:
 property bool BufferResponse { bool get(); void set(bool value); };
public bool BufferResponse { get; set; }
member this.BufferResponse : bool with get, set
Public Property BufferResponse As Boolean

属性值

Boolean

如果缓存该请求的响应,则为 true;否则为 falsetrue if the response for this request is buffered; otherwise, false. 默认为 trueThe default is true.

示例

下面的代码示例将 BufferResponse 属性设置为 false ,并将文本文件的流式处理返回给客户端。The following code example sets the BufferResponse property to false and handles the streaming of a text file back to the client. 此代码示例演示如何使用实现接口的类将大量数据流式传输回客户端 IEnumerableThe code example demonstrates how to stream a large piece of data back to the client using a class that implements the IEnumerable interface.

<%@WebService class="Streaming" language="C#"%>

using System;
using System.IO;
using System.Collections;
using System.Xml.Serialization;
using System.Web.Services;
using System.Web.Services.Protocols;

public class Streaming {

    [WebMethod(BufferResponse=false)]
    public TextFile GetTextFile(string filename) {
        return new TextFile(filename);
    }

    [WebMethod]
    public void CreateTextFile(TextFile contents) {
        contents.Close();
    }

}

public class TextFile {
    public string filename;
    private TextFileReaderWriter readerWriter;

    public TextFile() {
    }

    public TextFile(string filename) {
        this.filename = filename;
    }

    [XmlArrayItem("line")]
    public TextFileReaderWriter contents {
        get {
            readerWriter = new TextFileReaderWriter(filename);
            return readerWriter;
        }
    }

    public void Close() {
        if (readerWriter != null) readerWriter.Close();
    }
}

public class TextFileReaderWriter : IEnumerable {

    public string Filename;
    private StreamWriter writer;

    public TextFileReaderWriter() {
    }

    public TextFileReaderWriter(string filename) {
        Filename = filename;
    }

    public TextFileEnumerator GetEnumerator() {
        StreamReader reader = new StreamReader(Filename);
        return new TextFileEnumerator(reader);
    }

    IEnumerator IEnumerable.GetEnumerator() {
        return GetEnumerator();
    }

    public void Add(string line) {
        if (writer == null)
            writer = new StreamWriter(Filename);
        writer.WriteLine(line);
    }

    public void Close() {
        if (writer != null) writer.Close();
    }

}

public class TextFileEnumerator : IEnumerator {
    private string currentLine;
    private StreamReader reader;

    public TextFileEnumerator(StreamReader reader) {
        this.reader = reader;
    }

    public bool MoveNext() {
        currentLine = reader.ReadLine();
        if (currentLine == null) {
            reader.Close();
            return false;
        }
        else
            return true;
    }

    public void Reset() {
        reader.BaseStream.Position = 0;
    }

    public string Current {
        get {
            return currentLine;
        }
    }

    object IEnumerator.Current {
        get {
            return Current;
        }
    }
}
<%@WebService Class="Streaming" language="VB"%>

Imports System
Imports System.IO
Imports System.Collections
Imports System.Xml.Serialization
Imports System.Web.Services
Imports System.Web.Services.Protocols

Public Class Streaming 

    <WebMethod(BufferResponse:=False)> _
    Public Function GetTextFile(filename As String ) As TextFile
      Return New TextFile(filename)        
    End Function

    <WebMethod> _
    Public Sub CreateTextFile(contents As TextFile) 
        contents.Close()
    End Sub

End Class

Public Class TextFile 
    Public filename As String 
    Private readerWriter As TextFileReaderWriter 

    Public Sub New() 
    End Sub

    Public Sub New(filename As String) 
        Me.filename = filename
    End Sub

    <XmlArrayItem("line")> _
    Public ReadOnly Property contents As TextFileReaderWriter
        Get 
            readerWriter = New TextFileReaderWriter(filename)
            Return readerWriter
        End Get
    End Property

    Public Sub Close() 
        If Not (readerWriter Is Nothing) Then
      readerWriter.Close()
        End If
    End Sub
End Class

Public Class TextFileReaderWriter 
   Implements IEnumerable 


    Public Filename As String 
    Private writer As StreamWriter 

    Public Sub New() 
    End Sub

    Public Sub New(myfilename As String ) 
        Filename = myfilename
    End Sub

    Function GetEnumerator() As IEnumerator Implements IEnumerable.GetEnumerator
        Dim reader As StreamReader = New StreamReader(Filename)
        Return New TextFileEnumerator(reader)
    End Function

    Public Sub Add(line As String) 
        If (writer Is Nothing) Then
            writer = New StreamWriter(Filename)
    End If
        writer.WriteLine(line)
    End Sub

    Public Sub Add(obj as Object)
    
    End Sub

    Public Sub Close() 
        If Not (writer Is Nothing) Then writer.Close()
    End Sub

End Class

Public Class TextFileEnumerator 
  Implements IEnumerator 
    Private currentLine As String
    Private reader As StreamReader

    Public Sub New(reader As StreamReader) 
        Me.reader = reader
    End Sub

    Public Function MoveNext() As Boolean Implements IEnumerator.MoveNext
        currentLine = reader.ReadLine()
        If (currentLine Is Nothing) Then
            reader.Close()
            Return False
        Else
            Return True
        End If
    End Function

    Public Sub Reset() Implements IEnumerator.Reset
        reader.BaseStream.Position = 0
    End Sub

    ReadOnly Property Current As object Implements IEnumerator.Current
        Get 
            Return CurrentLine
        End Get
    End Property
End Class

注解

如果将设置 BufferResponsetrue ,则会将 XML Web service 方法的响应序列化为内存缓冲区,直到响应完全序列化或缓冲区已满。Setting BufferResponse to true, serializes the response of the XML Web service method into a memory buffer until either the response is completely serialized or the buffer is full. 缓冲响应后,会通过网络将其返回到 XML Web service 客户端。Once the response is buffered, it is returned to the XML Web service client over the network. BufferResponse 为时 false ,对 XML Web service 方法的响应将在序列化时发送回客户端。When BufferResponse is false, the response to the XML Web service method is sent back to the client as it is serialized. 通常, BufferResponse false 如果已知 XML Web service 方法向客户端返回大量数据,则只需将设置为。In general, you only want to set BufferResponse to false, if it is known that an XML Web service method returns large amounts of data to the client. 对于较小的数据量,XML Web service 性能对于更 BufferResponsetrueFor smaller amounts of data, XML Web service performance is better with BufferResponse to true.

BufferResponse 为时 false ,将为 XML Web service 方法禁用 SOAP 扩展。When BufferResponse is false, SOAP extensions are disabled for the XML Web service method.

适用于