网络服务错误它没有无参数构造函数'

发布于 2024-09-13 15:50:46 字数 595 浏览 4 评论 0原文

我创建了一个 Web 服务，它是一种使用 Microsoft.Web.Services3.WebServicesClientProtocol 设置用户凭据的方法。示例代码是：

<WebMethod()> _
    Public Sub ClientCredential1(Of TSecurityToken As SecurityToken)_
         (ByVal UserCred As Microsoft.Web.Services3.Security.Tokens.UsernameToken)

        Dim cProxy As New Microsoft.Web.Services3.WebServicesClientProtocol()
        cProxy.SetClientCredential(UserCred)
    End Sub

当我运行 Web 服务时，出现以下错误：

“Microsoft.Web.Services3.Security.Tokens.UsernameToken 无法序列化，因为它没有无参数构造函数。”

有谁知道问题出在哪里吗？

原文

I've created a web service , which can a method to set the user credential using Microsoft.Web.Services3.WebServicesClientProtocol. The sample code is :

<WebMethod()> _
    Public Sub ClientCredential1(Of TSecurityToken As SecurityToken)_
         (ByVal UserCred As Microsoft.Web.Services3.Security.Tokens.UsernameToken)

        Dim cProxy As New Microsoft.Web.Services3.WebServicesClientProtocol()
        cProxy.SetClientCredential(UserCred)
    End Sub

When I run the web service it gives this error:

"Microsoft.Web.Services3.Security.Tokens.UsernameToken cannot be serialized because it does not have a parameterless constructor."

Does any one know where is the problem ?

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老街孤人 2024-09-20 15:50:46

这里问题的根源是类 Microsoft.Web.Services3.Security.Tokens.UsernameToken 没有无参数构造函数。它有 3 个，但它们都需要一个参数。 MSDN 上的 UsernameToken 构造函数。

UsernameToken (XmlElement)
UsernameToken (String, String)
UsernameToken (String, String, PasswordOption)

问题是在反序列化过程中，XmlSerializer调用无参数构造函数来创建该类的实例。它无法反序列化没有无参数构造函数的类型。

我觉得你无能为力来解决这个问题。我只建议创建一个分部类，并自己实现该零参数构造函数。

'ensure namespacing is correct.
Public Partial Class UsernameToken
    Public Sub New()
    End Sub    
End Class

The root of the problem here is that the class Microsoft.Web.Services3.Security.Tokens.UsernameToken doesn't have a parameter-less constructor. It's got 3 of them, but they all demand a parameter. UsernameToken constructors on MSDN.

UsernameToken (XmlElement)
UsernameToken (String, String)
UsernameToken (String, String, PasswordOption)

The problem is that during deserialization, XmlSerializer calls the parameterless constructor to create an instance of that class. It can't deserialize a type that doesn't have a parameterless constructor.

I get the sense there's not much you can do to work around this problem. I'd only suggest creating a partial class, and implementing that zero-param constructor yourself.

'ensure namespacing is correct.
Public Partial Class UsernameToken
    Public Sub New()
    End Sub    
End Class

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七禾 2024-09-20 15:50:46

p。坎贝尔是对的，这是因为 XmlSerializer 需要无参数构造函数。

我不知道 WSE，但通过查看 Aleem 博客上的这篇文章，我不认为 UsernameToken 应该作为常规参数传递给 Web 方法 - 它应该在 WS-Security SOAP 标头中传递。您可以通过调用 SetClientCredential()。这是上面博客文章中的示例：

Dim oService As New WSETestService.ServiceWse

Dim U As New UsernameToken(“<User_Name>”, “<Password>”, PasswordOption.SendHashed)
oService.SetClientCredential(U)

p. campbell is right, it's because the XmlSerializer requires a parameterless constructor.

I don't know WSE, but from looking at this post on Aleem's Weblog, I don't think the UsernameToken is supposed to be passed as a regular argument to a web method - it's supposed to be passed in the WS-Security SOAP headers. You get the proxy to pass it in the headers by calling SetClientCredential(). Here's the example from the above blog post:

Dim oService As New WSETestService.ServiceWse

Dim U As New UsernameToken(“<User_Name>”, “<Password>”, PasswordOption.SendHashed)
oService.SetClientCredential(U)

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