带有可选参数的 Web 服务方法 [英] Web Service Method with Optional Parameters

问题描述

可能的重复:
我可以有一个可选参数吗用于 ASP.NET SOAP 网络服务

我已经尝试四处寻找这个，但我真的找不到适合我想做的事情的正确解决方案.很抱歉重复，因为我知道以前有人问过这个问题.我有一个 Web 服务方法，我想在其中包含一个可选参数，例如:

I have tried looking around for this but I really cannot find the right solution for what I want to do. Sorry for the repetition since I know this has been asked before. I have a Web Service Method in which I want to have an optional parameter such as:

public void MyMethod(int a, int b, int c = -3)

我已经知道我不能使用可为空的参数，所以我只是尝试使用默认值.问题是当我在不提供参数的情况下调用此方法时， c 仍然会出现异常.有什么地方我必须指定它实际上是可选的吗?

I already know I cannot use nullable parameters, so I am just trying to use a default value. Problem is when I call this method without supplying argument c is still get an exception. Is there somewhere I have to specify it is in fact optional?

谢谢ю

推荐答案

您可以通过重载和使用 MessageName 属性来实现可选参数.

You can achieve optional parameters by overloads and using the MessageName property.

[WebMethod(MessageName = "MyMethodDefault")]
public void MyMethod(int a, int b)
{
      MyMethod( a, b, -3);
}

[WebMethod(MessageName = "MyMethod")]
public void MyMethod(int a, int b, int c)

要使其正常工作，您可能还需要更改

For this to work, you may also need to change

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] 

到

[WebServiceBinding(ConformsTo = WsiProfiles.None)] 

如果您还没有这样做，因为WS-I Basic Profile v1.1 不允许重载

if you haven't done so already, as WS-I Basic Profile v1.1 does not allow overloads

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