如何阅读Swashbuckle中的自定义标题？

Question

我用下面的代码到一个自定义标题添加到操作：

public class RequestIdParameter : IOperationFilter 
{ 
    public void Apply(Swashbuckle.Swagger.Operation operation, SchemaRegistry schemaRegistry, ApiDescription apiDescription) 
    { 
     if (operation == null) return; 

     if (operation.parameters == null) 
     { 
      operation.parameters = new List<Parameter>(); 
     } 

     var requestParameter = new Parameter 
     { 
      description = "RequestId", 
      @in = "header", 
      name = "RequestId", 
      required = true, 
      type = "string" 
     }; 

     operation.parameters.Add(requestParameter); 
    } 
} 

但现在我需要阅读该值。我想这个代码，但自定义页眉不存在：

System.Web.HttpContext.Current.Items.contains("requestId") 

Answer 1

试试这个：

if (HttpContext.Current.Request.Headers.Contains("RequestId")) 
{ 
    string value = HttpContext.Current.Request.Headers.GetValues("RequestId").FirstOrDefault(); 
} 

或

IEnumerable<string> headerValues; 
if (HttpContext.Current.Request.Headers.TryGetValues("RequestId", out headerValues)) 
{ 
    string value = headerValues.FirstOrDefault(); 
}