FromBody attribute
The FromBody attribute directs ASP.NET Core model binding to deserialize a parameter or property value from the HTTP request body.
ASP.NET Core in Action, 3e
The FromBody attribute is an ASP.NET Core parameter-binding attribute that specifies binding a parameter from the deserialized HTTP request body.
- How it is used
- Directs ASP.NET Core model binding to obtain a parameter from JSON content in an HTTP request body.
- How deep it goes
- Explains JSON deserialization, binding-source precedence, media-type failures, verb restrictions, and multiple-body-parameter errors.
- Examples
- Uses a Product record in a POST endpoint and a List<Photo> parameter in a Razor Pages handler.
- What you can do after
- Apply it via ASP.NET Core handler parameters to select JSON body binding and avoid common request-shape errors.
Read how ASP.NET Core in Action, 3e explains FromBody attribute →
Pro ASP.NET Core 7, Tenth Edition
The FromBody attribute is an ASP.NET Core parameter attribute that specifies that a parameter value should be read from the HTTP request body.
- How it is used
- Selects the HTTP request body as the model-binding source for an action parameter receiving JSON.
- How deep it goes
- Shows parameter placement and a working POST request, but defers the complexities of model binding and data validation.
- Examples
- Uses Product actions and PowerShell JSON POST and PUT requests, including a POST whose bound object is returned.
- What you can do after
- Apply it via ASP.NET Core MVC to bind a JSON request body to a controller action parameter.
Read how Pro ASP.NET Core 7, Tenth Edition explains FromBody attribute →
Related concepts
- payloaduses · A payload is the data, code, or other material carried by or attached to a message, token, system, or operation.
- ApiControllercontrasts with · ApiController is an ASP.NET Core attribute that enables API-specific conventions and behavior for controller classes, including request binding and validation handling.
- 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.
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