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WebApi - Bind from both Uri and Body

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小鲜肉
小鲜肉 2020-12-13 12:51

Is it possible to bind a model from both the Uri and Body?

For instance, given the following:

routes.MapHttpRoute(
    name: \"API Default\",
    rou
4条回答
  • 失恋的感觉
    失恋的感觉 (楼主)
    2020-12-13 13:09

    You can define your own DefaultActionValueBinder. Then you can mix and match from body and uri. Here is a blog post with an example of an MvcActionValueBinder for Web Api. Making your own DefaultActionValueBinderis a preferred solution because it guarantees the binder will have finished before any other ActionFilterAttribute are executed.

    http://blogs.msdn.com/b/jmstall/archive/2012/04/18/mvc-style-parameter-binding-for-webapi.aspx

    UPDATE:

    I had some trouble with the implementation in the blog post and trying to get it to use my custom media formatters. Luckily all my request objects extend from a base class of Request so I made my own formatter.

    in WebApiConfig

    config.ParameterBindingRules.Insert(0, descriptor => descriptor.ParameterType.IsSubclassOf(typeof (Request)) ? new BodyAndUriParameterBinding(descriptor) : null);

    BodyAndUriParameterBinding.cs

    public class BodyAndUriParameterBinding : HttpParameterBinding
{
    private IEnumerable Formatters { get; set; }
    private IBodyModelValidator BodyModelValidator { get; set; }
    public BodyAndUriParameterBinding(HttpParameterDescriptor descriptor)
        : base (descriptor)
    {
        var httpConfiguration = descriptor.Configuration;
        Formatters = httpConfiguration.Formatters;
        BodyModelValidator = httpConfiguration.Services.GetBodyModelValidator();
    }

    private Task ReadContentAsync(HttpRequestMessage request, Type type,
        IEnumerable formatters, IFormatterLogger formatterLogger, CancellationToken cancellationToken)
    {
        var content = request.Content;
        if (content == null)
        {
            var defaultValue = MediaTypeFormatter.GetDefaultValueForType(type);
            return defaultValue == null ? Task.FromResult(null) : Task.FromResult(defaultValue);
        }

        return content.ReadAsAsync(type, formatters, formatterLogger, cancellationToken);
    }

    public override Task ExecuteBindingAsync(ModelMetadataProvider metadataProvider, HttpActionContext actionContext,
        CancellationToken cancellationToken)
    {
        var paramFromBody = Descriptor;
        var type = paramFromBody.ParameterType;
        var request = actionContext.ControllerContext.Request;
        var formatterLogger = new ModelStateFormatterLogger(actionContext.ModelState, paramFromBody.ParameterName);
        return ExecuteBindingAsyncCore(metadataProvider, actionContext, paramFromBody, type, request, formatterLogger, cancellationToken);
    }

    // Perf-sensitive - keeping the async method as small as possible
    private async Task ExecuteBindingAsyncCore(ModelMetadataProvider metadataProvider, HttpActionContext actionContext,
        HttpParameterDescriptor paramFromBody, Type type, HttpRequestMessage request, IFormatterLogger formatterLogger,
        CancellationToken cancellationToken)
    {
        var model = await ReadContentAsync(request, type, Formatters, formatterLogger, cancellationToken);

        if (model != null)
        {
            var routeParams = actionContext.ControllerContext.RouteData.Values;
            foreach (var key in routeParams.Keys.Where(k => k != "controller"))
            {
                var prop = type.GetProperty(key, BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Public);
                if (prop == null)
                {
                    continue;
                }
                var descriptor = TypeDescriptor.GetConverter(prop.PropertyType);
                if (descriptor.CanConvertFrom(typeof(string)))
                {
                    prop.SetValue(model, descriptor.ConvertFromString(routeParams[key] as string));
                }
            }
        }

        // Set the merged model in the context
        SetValue(actionContext, model);

        if (BodyModelValidator != null)
        {
            BodyModelValidator.Validate(model, type, metadataProvider, actionContext, paramFromBody.ParameterName);
        }
    }
}



    Request.cs
    


    public abstract class Request : IValidatableObject
{
    public virtual IEnumerable Validate(ValidationContext validationContext)
    {
        yield return ValidationResult.Success;
    }
}

    
    
    
             
    
                                                        
    
            
            
    
              
                
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