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WCF Custom Bindings

You can use the CustomBinding class when one of the system-provided bindings does not meet the requirements of your service. All bindings are constructed from an ordered set of binding elements. Custom bindings can be built from a set of system-provided binding elements or can include user-defined custom binding elements. You can use custom binding elements, for example, to enable the use of new transports or encoders at a service endpoint. For working examples, see Custom Binding Samples. For more information, see .

Construction of a Custom Binding

A custom binding is constructed using the CustomBinding constructor from a collection of binding elements that are "stacked" in a specific order:

At the top is an optional TransactionFlowBindingElement class that allows flowing transactions.

Next is an optional ReliableSessionBindingElement class that provides a session and ordering mechanisms as defined in the WS-ReliableMessaging specification. A session can cross SOAP and transport intermediaries.

Next is an optional SecurityBindingElement class that provides security features such as authorization, authentication, protection, and confidentiality.

Next is an optional CompositeDuplexBindingElement class that provides the ability to have two way duplex communication with a transport protocol that does not support duplex communication natively, such as HTTP.

Next is an optional OneWayBindingElement) class that provides one-way communication.

Next is an optional stream security binding element which can be one of the following.

SslStreamSecurityBindingElement

WindowsStreamSecurityBindingElement

Next is a required message encoding binding element. You can use your own message encoder or one of the three message encoding bindings:

TextMessageEncodingBindingElement

BinaryMessageEncodingBindingElement

MtomMessageEncodingBindingElement

At the bottom is a required transport element. You can use your own transport or one of the following transport binding elements Windows Communication Foundation (WCF) provides:

TcpTransportBindingElement

HttpTransportBindingElement

HttpsTransportBindingElement

NamedPipeTransportBindingElement

PeerTransportBindingElement

MsmqTransportBindingElement

MsmqIntegrationBindingElement

ConnectionOrientedTransportBindingElement

The following table summarizes the options for each layer.

Layer Options Required
Transactions
TransactionFlowBindingElement
No
Reliability
ReliableSessionBindingElement
No
Security
SecurityBindingElement
No
Encoding
Text, binary, Message Transmission Optimization Mechanism (MTOM), custom
Yes
Transport
TCP, HTTP, HTTPS, named pipes (also known as IPC), Peer-to-Peer (P2P), Message Queuing (also known as MSMQ), Custom
Yes
In addition, you can define your own binding elements and insert them between any of the preceding defined layers.
http://msdn.microsoft.com/en-us/library/aa347793.aspx.

WCF CustomBinding

Custom bindings provide full control over the WCF messaging stack. Special tailored bindings can be created my adding the configuration elements for specific entities. For example, the user can combine the httpsTransport section, reliableSession section and the securitysection to create a reliable and secure https based binding.An individual binding defines the message stack by specifying the configuration elements for the stack elements in the order they appear on the stack. Each element defines and configures the one element of the stack. There must be one and only one transport element in each custom binding. Without this element, the messaging stack is incomplete.The order in which elements appear in the stack matters, because it is the order in which operations are applied to the message. The recommended order of stack elements is the following:Transactions (optional)Reliable Messaging (optional)Security (optional)TransportEncoder (optional)Use a custom binding when one of the system-provided bindings does not meet the requirements of your service. A custom binding could be used, for example, to enable the use of a new transport or a new encoder at a service endpoint.A custom binding is constructed using one of the CustomBinding from a collection of binding elements that are "stacked" in a specific order:At the top is an optional TransactionFlowBindingElement that allows flowing transactions.Next is an optional ReliableSessionBindingElement that provides a session and ordering mechanism as defined in the WS-ReliableMessaging specification. This notion of a session can cross SOAP and transport intermediaries.Next is an optional security binding element that provides security features like authorization, authentication, protection, and confidentiality. The following security binding elements are provided by Windows Communication Foundation (WCF):SecurityBindingElement AsymmetricSecurityBindingElement SymmetricSecurityBindingElement TransportSecurityBindingElement Next are the optional message-patterns specified by binding elements:CompositeDuplexBindingElement Next are the optional transport upgrades/helpers binding elements: PnrpPeerResolverBindingElement SslStreamSecurityBindingElement WindowsStreamSecurityBindingElement Next is a required message encoding binding element. You can use your own transport or use one of the following message encoding bindings: TextMessageEncodingBindingElement BinaryMessageEncodingBindingElement MtomMessageEncodingBindingElement At the bottom is a required transport element. You can use your own transport or use one of transport binding elements provided by Windows Communication Foundation (WCF): TcpTransportBindingElement NamedPipeTransportBindingElement HttpTransportBindingElement HttpsTransportBindingElement MsmqTransportBindingElement MsmqIntegrationBindingElement PeerTransportBindingElement The following table summarizes the options for each layer.LayerOptionsRequiredTransaction FlowTransactionFlowBindingElementNoReliabilityReliableSessionBindingElementNoSecuritySymmetric, Asymmetric, Transport-LevelNoShape ChangeCompositeDuplexBindingElementNoTransport UpgradesSSL stream, Windows stream, Peer ResolverNoEncodingText, Binary, MTOM, CustomYesTransportTCP, Named Pipes, HTTP, HTTPS, flavors of MSMQ, CustomYesIn addition, you can define your own binding elements and insert them between any of the preceding defined layers.For a discussion on how to use a custom binding to modify a system-provided binding, see How To: Customize a System-Provided Binding.

Syntax
closeTimeout="TimeSpan"
openTimeout="TimeSpan"
receiveTimeout="TimeSpan"
sendTimeout="TimeSpan"

advancedFlowControl="Boolean"
bufferedMessagesQuota="Integer"
inactivityTimeout="TimeSpan"
maxPendingChannels="Integer"
maxRetryCount="Integer"
ordered="Boolean" />




defaultAlgorithmSuite="Basic128/Basic192/Basic256/Basic128Rsa15/Basic256Rsa15/TripleDes/TripleDesRsa15/Basic128Sha256/Basic192Sha256/TripleDesSha256/Basic128Sha256Rsa15/Basic192Sha256Rsa15/Basic256Sha256Rsa15/TripleDesSha256Rsa15"
authenticationMode="UserNameForAnonymous"
contextMode="Cookie"
defaultProtectionLevel="Sign"
enableKeyDerivation="false"
keyEntropyMode="ClientEntropy"
messageProtectionOrder="SignBeforeEncryptAndEncryptSignature"
securityVersion="WSSecurityXXX2005">
detectReplays="false"
maxCookieCachingTime="00:07:24" />
maxClockSkew="00:00:03"
replayWindow="00:07:22.2190000" />

maxWritePoolSize="Integer"
maxSessionSize="Integer" />
maxMessageSize="Integer"
authenticationScheme="Negotiate"
bypassProxyOnLocal="Boolean"
hostNameComparisonMode="Exact"
mapAddressingHeadersToHttpHeaders="Boolean"
proxyaddress="Uri"
realm="String"
requireClientCertificate="Boolean" />
maxMessageSize="20002"
listenIPAddress="202.10.1.9"
messageAuthentication="false"
peerNodeAuthenticationMode="None"
port="1000" />
defaultAlgorithmSuite="Basic128/Basic192/Basic256/Basic128Rsa15/Basic256Rsa15/TripleDes/TripleDesRsa15/Basic128Sha256/Basic192Sha256/TripleDesSha256/Basic128Sha256Rsa15/Basic192Sha256Rsa15/Basic256Sha256Rsa15/TripleDesSha256Rsa15"
authenticationMode="UserNameForAnonymous"
bootstrapBindingConfiguration="String"
bootstrapBindingSectionName="String"
defaultProtectionLevel="None/Sign/EncryptAndSign"
requireDerivedKeys="Boolean"
securityHeaderLayout="Strict/Lax/LaxTimestampFirst/LaxTimestampLast"
includeTimestamp="Boolean"
keyEntropyMode="ClientEntropy/ServerEntropy/CombinedEntropy"
messageProtectionOrder="SignBeforeEncrypt/SignBeforeEncryptAndEncryptSignature/EncryptBeforeSign"
protectTokens="Boolean"
requireSecurityContextCancellation="Boolean"
securityVersion=" WSSecurityJan2004/WSSecurityXXX2005"
requireSignatureConfirmation="Boolean" >
detectReplays="Boolean"
replayCacheSize="Integer"
maxClockSkew="TimeSpan"
maxCookieCachingTime="TimeSpan"
replayWindow="TimeSpan"
sessionKeyRenewalInterval="TimeSpan"
sessionKeyRolloverInterval="TimeSpan"
reconnectOnTransportFailure="Boolean"
timestampValidityDuration="TimeSpan"
cookieRenewalThresholdPercentage="Integer" />
issuedCookieLifeTime="TimeSpan"
maxStatefulNegotiations="Integer"
replayCacheSize="Integer"
maxClockSkew="TimeSpan"
negotiationTimeout="TimeSpan"
replayWindow="TimeSpan"
inactivityTimeout="TimeSpan"
sessionKeyRenewalInterval="TimeSpan"
sessionKeyRolloverInterval="TimeSpan"
reconnectOnTransportFailure="Boolean"
maxConcurrentSessions="Integer"
timestampValidityDuration="TimeSpan" />

defaultAlgorithmSuite="Basic128/Basic192/Basic256/Basic128Rsa15/ Basic256Rsa15/TripleDes/TripleDesRsa15/Basic128Sha256/Basic192Sha256/TripleDesSha256/Basic128Sha256Rsa15/Basic192Sha256Rsa15/Basic256Sha256Rsa15/TripleDesSha256Rsa15"
authenticationMode="UserNameForAnonymous"
bootstrapBindingConfiguration="String"
bootstrapBindingSectionName="String"
defaultProtectionLevel="None/Sign/EncryptAndSign"
requireDerivedKeys="Boolean"
securityHeaderLayout="Strict/Lax/LaxTimestampFirst/LaxTimestampLast"
includeTimestamp="Boolean"
keyEntropyMode="ClientEntropy/ServerEntropy/CombinedEntropy"
messageProtectionOrder="SignBeforeEncrypt/SignBeforeEncryptAndEncryptSignature/EncryptBeforeSign"
protectTokens="Boolean"
requireSecurityContextCancellation="Boolean"
securityVersion=" WSSecurityJan2004/WSSecurityXXX2005"
requireSignatureConfirmation="Boolean" >
detectReplays="Boolean"
replayCacheSize="Integer"
maxClockSkew="TimeSpan"
maxCookieCachingTime="TimeSpan"
replayWindow="TimeSpan"
sessionKeyRenewalInterval="TimeSpan"
sessionKeyRolloverInterval="TimeSpan"
reconnectOnTransportFailure="Boolean"
timestampValidityDuration="TimeSpan"
cookieRenewalThresholdPercentage="Integer" />
issuedCookieLifeTime="TimeSpan"
maxStatefulNegotiations="Integer"
replayCacheSize="Integer"
maxClockSkew="TimeSpan"
negotiationTimeout="TimeSpan"
replayWindow="TimeSpan"
inactivityTimeout="TimeSpan"
sessionKeyRenewalInterval="TimeSpan"
sessionKeyRolloverInterval="TimeSpan"
reconnectOnTransportFailure="Boolean"
maxConcurrentSessions="Integer"
timestampValidityDuration="TimeSpan" />


keySize="Integer"
tokenType="String" />
bindingConfiguration="String"
binding="String" />
cacheIssuedTokens="Boolean"
maxIssuedTokenCachingTime="TimeSpan"
keyEntropyMode="ClientEntropy/ServerEntropy/CombinedEntropy" />
behaviorConfiguration="String" />
bindingConfiguration="String"
binding="String" />