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In my interface I have declared this.
[OperationContract]
[WebGet]
String GetStuff(String beep, String boop = "too lazy to type");
I implemented it as follows.
String GetStuff(String beep, String boop = "too lazy to type") { ... }
It compiles and uploads as my WCF service. However, when I used it as a web reference and try to execute the code below, I get the compiler whining and weeping about no method with signature of a single parameter. The last line is the problem.
How can I then be too lazy to type by default?
ServiceClient client = new ServiceClient();
client.GetStuff("blobb", "not lazy");
client.GetStuff("blobb");
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You can use optional parameters in Methods, Constructors, Indexers, and Delegates. Each and every optional parameter contains a default value which is the part of its definition. If we do not pass any parameter to the optional arguments, then it takes its default value.
By Params Keyword: You can implement optional parameters by using the params keyword. It allows you to pass any variable number of parameters to a method. But you can use the params keyword for only one parameter and that parameter is the last parameter of the method.
By definition, an Optional Parameter is a handy feature that enables programmers to pass less number of parameters to a function and assign a default value.
The definition of a method, constructor, indexer, or delegate can specify its parameters are required or optional. Any call must provide arguments for all required parameters, but can omit arguments for optional parameters. Each optional parameter has a default value as part of its definition.
Simply: default arguments are not supported.
By design and with reason. We use C# to write WCF contracts but that's a notational trick. Not every C# language feature can be implemented in SOAP, REST or JSon.
185
You can try this, overloading the function.
[OperationContract]
MyResponse GetData();
[OperationContract(Name = "GetDataByFilter")]
MyResponse GetData(string filter);
Then another option is to use a DataContract instead of multiple parameters, and set IsRequired to false on the appropriate DataMembers, like explained in this question.
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