How to get action argument is FromServices or FromBody or another

Question

I have an custom action filter for check action parameters before execute the action

public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
{
    if (context.ModelState.IsValid == false)
        throw new Exception("");
    if (context.ActionArguments.Values.Any() && context.ActionArguments.Values.All(v => v.IsAllPropertiesNull()))
        throw new Exception("");

    await next();
}

how can I check the context.ActionArguments.Value is [FromBody] or [FromServices] or [FromRoute] and etc...

Answer 1

You get the binding source from the BindingInfo of each parameter. You get this from the context.ActionDescriptor.Parameters . Here is an example.

public class CustomActionFilter: IAsyncActionFilter
{
    /// <inheritdoc />
    public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
    {
        foreach (var parameterDescriptor in context.ActionDescriptor.Parameters)
        {
            var bindingSource = parameterDescriptor.BindingInfo.BindingSource;

            if (bindingSource == BindingSource.Body)
            {
                // bound from body
            }
            else if (bindingSource == BindingSource.Services)
            {
                // from services
            }
            else if (bindingSource == BindingSource.Query)
            {
                // from query string
            }
        }
    }
}