Result filter
A result filter is an ASP.NET Core MVC filter that runs before and after action-result execution and can modify result processing or the response.
ASP.NET Core in Action, 3e
IResultFilter is an ASP.NET Core interface for synchronous MVC filters that run before and after result execution.
- How it is used
- Customizes how an MVC or Razor Pages `IActionResult` executes, including response headers and API output formatting.
- How deep it goes
- Explains pipeline timing, synchronous implementation, and short-circuit behavior through a header example; does not develop a larger custom filter.
- Examples
- Shows a `Last-Modified` response header and built-in filters selecting XML or a format named in a URL.
- What you can do after
- Build it from scratch to adjust a result before execution, and choose an always-run filter when short-circuited results need the adjustment.
Read how ASP.NET Core in Action, 3e explains result filter →
Pro ASP.NET Core 7, Tenth Edition
A result filter is an ASP.NET Core MVC filter that runs before or after an action result executes and can modify the generated response.
- How it is used
- Applies reusable request-processing logic immediately before and after an MVC action result generates a response.
- How deep it goes
- Explains interfaces, contexts, replacement, short-circuiting, always-run behavior, scopes, and explicit ordering through application code.
- Examples
- Uses diagnostic output, GUID reuse, repeated message filters, controller attributes, global registration, and ordered filters.
- What you can do after
- Build an asynchronous result filter, apply it to MVC endpoints, replace results conditionally, and verify scope, reuse, and ordering through requests.
Read how Pro ASP.NET Core 7, Tenth Edition explains result filter →
Related concepts
- IActionResultuses · IActionResult is an ASP.NET Core MVC interface implemented by objects that represent the result of processing an HTTP request.
- servlet filterkind of · A servlet filter is a web component that intercepts requests and responses to inspect, transform, process, or reject them before or after servlet execution.
- filterkind of · A filter is an MVC component, implemented as an attribute or other mechanism, that can modify or constrain request or response processing.
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