How does the below statement work?
I tried to see in Microsoft documentation, but couldn't find much information
Link to Microsoft documentation
var queryString = this.Request.Query[SomeConstant.QueryString];
CodePudding user response:
Lets assume you hit any of your endpoint with
/someendpoint?foo=bar&name=Vamsi
You can now get the whole QueryCollection with:
var queries = this.Request.Query;
If you want to retrieve a specific value by its key, you can use that:
var foo = this.Request.Query["foo"] //value: bar
var name = this.Request.Query["name"] //value: Vamsi
So to answer your question: Query[SomeConstant.QueryString]
is accessing the QueryCollection of the current request by accessing a specific key, that is stored in a variable called SomeContant.QueryString
CodePudding user response:
The Query object here is an IQueryCollection
The IQueryCollection Implements both :
IEnumerable<KeyValuePair<String,StringValues>>
IEnumerable
suppose we have the following Url : http://localhost/home/index?code=A000
The key value pair you can see it as a dictionnary, we have a key that represent the query string parameter name (ex: code) and we had a value (ex: A000)
In order to retreive the code from the url, you have to search in that list and find this name. To do that, you call Query["code"]
In your case SomeConstant.QueryString
is a constant defined somewhere in your projet in a class with name SomeConstant
and a const with name QueryString
and the value of this const is "code"
.
public Class SomeConsant{
public const string SomeConstant = "code";
}