Question

我试图将一个IEnumerable从web api控制器发送到AngularJs控制器。我正在使用的代码是

Web Api：

readonly InventoryEntities _db = new InventoryEntities();

public IEnumerable<FDVOEligibilityRequest> Get()
{
   return _db.FDVOEligibilityRequests.AsEnumerable();
}

AngularJS：

//get all customer information
$http.get("/api/Customer/").success(function (data) {
        $scope.requests = data;
        $scope.loading = false;
    })
    .error(function () {
        $scope.error = "An Error has occured while loading posts!";
        $scope.loading = false;
    });

这很好用，但现在我使用linq来包含相关的表，但它不起作用。 angularJs代码是相同的。我做错了什么？

readonly InventoryEntities _db = new InventoryEntities();

public IEnumerable<FDVOEligibilityRequest> Get()
{
    return _db.FDVOEligibilityRequests
        .Include("FDVOEligibilityRequestMandatoryField")
        .Include("FDVOEligibilityRequestDCCField").AsEnumerable();
}

我确实在控制器中获取了我想要的数据，但是当我尝试将其发送回角度时，我得到500（内部服务器错误）angular.js：10722

这就是FDVOEligibilityRequest在新的Web Api控制器中的样子

public partial class FDVOEligibilityRequest
{
    public int Id { get; set; }
    public string TestName { get; set; }
    public string GroupName { get; set; }
    public int MandatoryFieldsID { get; set; }
    public int DCCFieldsID { get; set; }
    public virtual FDVOEligibilityRequestMandatoryField FDVOEligibilityRequestMandatoryField { get; set; }
    public virtual FDVOEligibilityRequestDCCField FDVOEligibilityRequestDCCField { get; set; }
}

Answer 1

如果它是500并且在您成功从您的操作返回后发生，那么在序列化期间它可能是一个例外。

我建议检查FDVOEligibilityRequest和FDVOEligibilityRequestMandatoryField / FDVOEligibilityRequestDCCField之间没有循环引用。

或尝试使用here中的代码进行诊断：

string Serialize<T>(MediaTypeFormatter formatter, T value)
{
    // Create a dummy HTTP Content.
    Stream stream = new MemoryStream();
    var content = new StreamContent(stream);
    /// Serialize the object.
    formatter.WriteToStreamAsync(typeof(T), value, stream, content, null).Wait();
    // Read the serialized string.
    stream.Position = 0;
    return content.ReadAsStringAsync().Result;
}

try {
    var val = _db.FDVOEligibilityRequests
        .Include("FDVOEligibilityRequestMandatoryField")
        .Include("FDVOEligibilityRequestDCCField").AsEnumerable();
    var str = Serialize(new JsonMediaTypeFormatter(), val);
}
catch (Exception x) 
{ // break point here
}

ps：在这种情况下，common suggestion是使用DTO而不是像Automapper这样的EF对象。

将IEnumerable从web api控制器发送到角度js

1 个答案: