我想知道如何将这种Begin-End-Async方法转换为更新的TPL语法:
public override IAsyncResult BeginRegisterClaimant(ClaimantSex claimantSex, AgeGroup ageGroup, AsyncCallback callback, object state)
{
AsyncResult<string> asyncResult = new AsyncResult<string>(callback, state);
InitManagementProxy();
m_management.RegisterClaimantCompleted += RegisterClaimantCallbackInternal;
m_management.RegisterClaimantAsync(m_configurationID, (PowWow.Service.ClaimantSex)claimantSex, (PowWow.Service.AgeGroup)ageGroup, new object[]
{ this, asyncResult
});
return asyncResult;
}
public override string EndRegisterClaimant(IAsyncResult asyncResult)
{
if (!(asyncResult is AsyncResult<string>))
{
throw new Exception("Invalid IAsyncResult object");
}
return ((AsyncResult<string>)asyncResult).Close();
}
private void InitManagementProxy()
{
WSHttpBinding binding;
if (m_management != null)
{
return;
}
binding = new WSHttpBinding(SecurityMode.Transport);
binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Basic;
m_management = new PowWow.Service.VerifierContractClient(binding, new EndpointAddress(m_managementUri));
m_management.ClientCredentials.UserName.UserName = m_userName;
m_management.ClientCredentials.UserName.Password = m_password;
}
private static void RegisterClaimantCallbackInternal(object senderObject, PowWow.Service.RegisterClaimantCompletedEventArgs eventArgs)
{
PowWowVerifier powWowVerifier = (PowWowVerifier)((Object[])eventArgs.UserState)[0];
powWowVerifier.m_management.RegisterClaimantCompleted -= RegisterClaimantCallbackInternal;
powWowVerifier.m_management.Close();
powWowVerifier.m_management = null;
if (eventArgs.Error != null)
{
((AsyncResult<string>)((Object[])eventArgs.UserState)[1]).OnException(eventArgs.Error);
}
else
{
((AsyncResult<string>)((Object[])eventArgs.UserState)[1]).OnExecuted(eventArgs.Result);
}
}
谢谢!
修改 ATM,不需要取消。可能需要进度报告,但不是优先事项。
答案 0 :(得分:0)
最简单的方法是将现有代码包装在TaskCompletionSource中并返回它的Task - 这将适合C#5中新的async / await模型