根据您的代码，您还需要传递"id"，如下所示:

Based on your code, you need to pass 'id' as well, like this:

http://localhost/api/Customer/?id=12345&Mobile=0012565987&Email=abcxyz.com&IsEmailVerified=true

如果要使"id"为可选，则可以使方法签名看起来像这样:

if you want to make 'id' optional, you can make your method signature look like this:

public IHttpActionResult GetCustomer([FromUri]CustomerRequest request, long id = 0)

如果未在URL中传递ID，则默认情况下会将ID设置为0.这样您就可以像最初一样访问您的URL:

this will set id to 0 by default, if you dont pass it in the URL. So you will be able to access your URL like you originally did:

http://localhost/api/Customer/? Mobile = 0012565987& Email = abcxyz.com& IsEmailVerified = true