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HttpMethodAttribute Class

Applying this attribute to an XML Web service client using HTTP-GET or HTTP-POST, sets the types that serialize the parameters sent to an XML Web service method and read the response from the XML Web service method. This class cannot be inherited.

Namespace:  System.Web.Services.Protocols
Assembly:  System.Web.Services (in System.Web.Services.dll)

public final class HttpMethodAttribute extends Attribute

If an XML Web service client calls an XML Web service method using HTTP-GET, ReturnFormatter must be set to XmlReturnReader and ParameterFormatter set to UrlParameterWriter. XML Web service clients invoking a XML Web service using HTTP-POST must set ReturnFormatter to XmlReturnReader and ParameterFormatter to HtmlFormParameterWriter.

The following example is a proxy class generated by the Wsdl.exe utility for calling an XML Web service utility using HTTP-POST. The Wsdl.exe automatically supplies the correct types for ReturnFormatter and ParameterFormatter, along with specifying that the proxy class inherits from HttpPostClientProtocol.

class MyUser extends System.Web.Services.Protocols.HttpPostClientProtocol{

    function MyUser(){
        this.Url = ""
    } //New

    public HttpMethodAttribute(XmlReturnReader, HtmlFormParameterWriter)
    function GetUserName() : UserName{
        return UserName(this.Invoke("GetUserName", this.Url + "/GetUserName", new Object[0]))
    } //GetUserName

    function BeginGetUserName(callback : System.AsyncCallback, asyncState : Object) : System.IAsyncResult{
        return this.BeginInvoke("GetUserName", this.Url + "/GetUserName", new Object[0], callback, asyncState)
    } //BeginGetUserName

    function EndGetUserName(asyncResult : System.IAsyncResult) : UserName{
        return UserName(this.EndInvoke(asyncResult))
    } //EndGetUserName
} //MyUser

public XmlRootAttribute(Namespace = "", IsNullable = true)
class UserName{
    var Name : String
    var Domain : String

} //UserName
[System::Xml::Serialization::XmlRootAttribute(Namespace=S"", IsNullable=true)]
public __gc class UserName {

    String* Name;
    String* Domain;

public __gc class MyUser : public System::Web::Services::Protocols::HttpPostClientProtocol {

    MyUser() {
        this->Url = S"";

    [System::Web::Services::Protocols::HttpMethodAttribute(__typeof(System::Web::Services::Protocols::XmlReturnReader), __typeof(System::Web::Services::Protocols::HtmlFormParameterWriter))]
    UserName* GetUserName() {
        return (dynamic_cast<UserName*>(this->Invoke(S"GetUserName", (String::Concat( this->Url, S"/GetUserName" )), new Object*[0])));

    System::IAsyncResult* BeginGetUserName(System::AsyncCallback* callback, Object* asyncState) {
        return this->BeginInvoke(S"GetUserName", (String::Concat( this->Url, S"/GetUserName" )), new Object*[0], callback, asyncState);

    UserName* EndGetUserName(System::IAsyncResult* asyncResult) {
        return (dynamic_cast<UserName*>(this->EndInvoke(asyncResult)));


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0