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

问题描述

可能重复：结果
的我能有一个ASP.NET SOAP网络服务的

我试图四处寻找，但我真的找不到什么我想要做的正确的解决方案。很抱歉的重复，因为我知道这已经问过。我有一个Web服务方法中，我想有一个可选的参数，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)

我已经知道我不能用空的参数的，所以我只是试图使用一个默认值。问题是，当我把这种方法不提供的参数C是仍然得到一个异常。有没有什么地方我必须指定它实际上是可选的？

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?

Thanksю

推荐答案

您可以实现通过过载和使用MessageName属性可选参数。

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)

对于这个工作，你可能还需要修改

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的话，因为 WS-I Basic Profile的1.1版不允许超载

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

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