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; }
}
所有其他模型都是从我的BaseModel派生的.
在webapi我有我的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.
解决方法
以下是使用HttpParameterBinding的快速示例.在这里,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,然后从请求标头获取用户标识并在反序列化对象上设置. (您可能需要在以下代码上添加其他验证检查).
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();
}
}
}