FromQuery attribute
The FromQuery attribute directs ASP.NET Core model binding to obtain a parameter or property value from the request URL's query string.
ASP.NET Core in Action, 3e
The FromQuery attribute is an ASP.NET Core parameter-binding attribute that specifies binding a parameter from query-string data and can name the query target.
- How it is used
- Directs minimal API handler parameters to query-string values when explicit binding or query-key naming is useful.
- How deep it goes
- Explains explicit-source precedence, target naming, repeated-value arrays, and 400 responses, but defers custom binding internals.
- Examples
- Demonstrates paged product endpoints and repeated product IDs renamed through FromQuery(Name).
- What you can do after
- Apply it via ASP.NET Core minimal APIs to select query binding and map repeated or differently named query keys.
Read how ASP.NET Core in Action, 3e explains FromQuery attribute →
Building Web APIs with ASP.NET Core
The FromQuery attribute directs ASP.NET Core model binding to obtain a parameter's value from the request query string.
- How it is used
- Binds complex GET-action parameters from query-string values while preserving the behavior of separate simple parameters.
- How deep it goes
- Explains explicit complex-parameter binding, alternatives, and DTO property usage, but does not detail binder internals.
- Examples
- Uses BoardGamesController.Get with RequestDTO input and demonstrates filtering, sorting, pagination, and response construction.
- What you can do after
- Apply it via ASP.NET Core to bind a request DTO’s properties from GET query parameters.
Read how Building Web APIs with ASP.NET Core explains FromQuery attribute →
Pro ASP.NET Core 7, Tenth Edition
The FromQuery attribute directs ASP.NET Core model binding to obtain a parameter value from the request URL's query string.
- How it is used
- Selects query-string data when default model-binding source precedence is unsuitable or must be made explicit.
- How deep it goes
- Demonstrates parameter and property binding, name overrides, conflicting route values, and structured query-string data.
- Examples
- Uses a conflicting `/index/5?id=1` URL, a bound Product array, and a supplier-creation breakout initiated by GET.
- What you can do after
- Apply it via ASP.NET Core model binding to force parameters or properties to read named values from query strings.
Read how Pro ASP.NET Core 7, Tenth Edition explains FromQuery attribute →
Related concepts
- model bindingconfigures · Model binding is the process of locating incoming data, converting it to appropriate types, and assigning it to application objects or handler parameters.
- SQLuses · SQL is a standardized declarative language for defining, querying, and manipulating data and structures in relational database systems.
- parameterconfigures · A model parameter is a numerical value, such as a weight or bias, that is learned or set to determine how a model computes outputs.
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