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  • webapi中Route标签定义可选参数

    Optional URI Parameters and Default Values

    You can make a URI parameter optional by adding a question mark to the route parameter. If a route parameter is optional, you must define a default value for the method parameter.

    
    public class BooksController : ApiController
    {
        [Route("api/books/locale/{lcid:int?}")]
        public IEnumerable<Book> GetBooksByLocale(int lcid = 1033) { ... }
    }

    In this example, /api/books/locale/1033 and /api/books/locale return the same resource.

    Alternatively, you can specify a default value inside the route template, as follows:

    
    public class BooksController : ApiController
    {
        [Route("api/books/locale/{lcid:int=1033}")]
        public IEnumerable<Book> GetBooksByLocale(int lcid) { ... }
    }

    This is almost the same as the previous example, but there is a slight difference of behavior when the default value is applied.

    • In the first example ("{lcid?}"), the default value of 1033 is assigned directly to the method parameter, so the parameter will have this exact value.
    • In the second example ("{lcid=1033}"), the default value of "1033" goes through the model-binding process. The default model-binder will convert "1033" to the numeric value 1033. However, you could plug in a custom model binder, which might do something different.

    (In most cases, unless you have custom model binders in your pipeline, the two forms will be equivalent.)

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  • 原文地址:https://www.cnblogs.com/a14907/p/5099549.html
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