Question

我有一个webApi2项目和另一个项目，其中我有我的Model类和BaseModel，它是所有模型的基础，如下所示，

public class BaseModel
{
    public string UserId { get; set; }
}

所有其他模型都来自我的BaseModel。

在webapi中，我的CustomerController如下，

public class CustomerController : ApiController
{
    [HttpPost]
    public GetCustomerResponseModel Get(GetCustomerRequestModel requestModel)
    {
        var response = new GetCustomerResponseModel();

        //I need only the UserId coming from the BaseModel is binded from request headers
        var userId = requestModel.UserId;

        //I want all model data except UserId is binded with default model binding
        var customerData = requestModel.CustomerData;
        var someOtherData = requestModel.SomeOtherData;

        return response;
    }

    [HttpPost]
    public AddStockAlertResponseModel AddStockAlert(AddStockAlertRequestModel requestModel)
    {
        var response = new AddStockAlertResponseModel();

        //I need only the UserId coming from the BaseModel is binded from request headers
        var userId = requestModel.UserId;

        //I want all model data except UserId is binded with default model binding
        var stockInfo = requestModel.StockInfo;

        return response;
    }
}

每个发送到CustomerController的请求在请求标头中都有一个“UserId”标头，我需要一个ModelBinder或ParameterBinder或一些功能，它只从请求标头绑定UserId而不触及其他模型参数。我的意思是除了UserId之外的模型参数默认是绑定的。

我不想使用AOP或拦截器或方面。是否可以仅将UserId与模型绑定器，参数绑定器等asp.net功能绑定。

Answer 1

以下是使用HttpParameterBinding的快速示例。这里我创建一个自定义参数绑定，我让默认的基于FromBody的绑定使用格式化程序来反序列化请求主体，然后从请求标头中获取用户标识并设置在反序列化对象上。（您可能需要在以下代码中添加其他验证检查。）

config.ParameterBindingRules.Insert(0, (paramDesc) =>
            {
                if (typeof(BaseModel).IsAssignableFrom(paramDesc.ParameterType))
                {
                    return new BaseModelParamBinding(paramDesc);
                }

                // any other types, let the default parameter binding handle
                return null;
            });

public class BaseModelParamBinding : HttpParameterBinding
{
    HttpParameterBinding _defaultFromBodyBinding;
    HttpParameterDescriptor _paramDesc;

    public BaseModelParamBinding(HttpParameterDescriptor paramDesc)
        : base(paramDesc)
    {
        _paramDesc = paramDesc;
        _defaultFromBodyBinding = new FromBodyAttribute().GetBinding(paramDesc);
    }

    public override async Task ExecuteBindingAsync(ModelMetadataProvider metadataProvider,
        HttpActionContext actionContext, CancellationToken cancellationToken)
    {
        await _defaultFromBodyBinding.ExecuteBindingAsync(metadataProvider, actionContext, cancellationToken);

        BaseModel baseModel = actionContext.ActionArguments[_paramDesc.ParameterName] as BaseModel;

        if (baseModel != null)
        {
            baseModel.UserId = actionContext.Request.Headers.GetValues("UserId").First();
        }
    }
}

WebApi2：自定义参数绑定以绑定部分参数

1 个答案: