2
我将JSON发布到控制器方法，并且它看起来好像JsonValueProvider包含在ASP.Net MVC 3中时，它试图将JSON数字转换为字节类型。ASP.net MVC JsonValueProvider字节类型问题
基本上，发生的情况是任何需要转换为字节的非空值都为空，并且我的模型状态有错误且没有错误消息。正如返回JSON中的问题列表所示。 dnbscore和地区有错误，但评级不会。返回的数据有dnbscore和region作为null，即使JSON通过时，这些字段也有值。我可以用一个自定义模型绑定器来处理这个问题，但是我想知道是否有另一种方法来使JsonValueProider像我期望的那样工作。
这是我试图建立对象：
public class APICustomerDetailsDTO
{
public int customerid { get; set; }
[StringLength(30)]
public string customername { get; set; }
public decimal? globalcredit { get; set; }
[Range(0,5)]
public byte? rating { get; set; }
[Range(0, 100)]
public byte? dnbscore { get; set; }
[Range(0, 8)]
public byte? region { get; set; }
[Required]
public bool isnotactive { get; set; }
public string salesperson { get; set; }
[StringLength(30)]
public string newmill_venderid { get; set; }
[StringLength(30)]
public string newmill_supplierid { get; set; }
[StringLength(30)]
public string edi_receiverid { get; set; }
[Required]
public bool edi_invoice { get; set; }
[StringLength(15)]
public string bill_code { get; set; }
}
这是我在POST请求我发送JSON：用于检查模型状态
{"bill_code":"good","customerid":50,"customername":"Ted","dnbscore":80,"edi_invoice":false,"edi_receiverid":null,"globalcredit":null,"isnotactive":false,"newmill_supplierid":null,"newmill_venderid":null,"rating":null,"region":0,"salesperson":null}
我的方法的一部分：
if (!ModelState.IsValid)
{
var issues = ModelState.Where(m => m.Value.Errors.Any())
.Select((m)=> new {field = m.Key, error = m.Value.Errors.FirstOrDefault().ErrorMessage})
.ToArray();
var result = new
{
result = "Failure",
message = "Invalid data received. See issues for details.",
issues = issues,
data = cust
};
返回JSON：
{"result":"Failure","message":"Invalid data received. See issues for details.","issues":[{"field":"dnbscore","error":""},{"field":"region","error":""}],"data":{"customerid":50,"customername":"Ted","globalcredit":null,"rating":null,"dnbscore":null,"region":null,"isnotactive":false,"salesperson":null,"newmill_venderid":null,"newmill_supplierid":null,"edi_receiverid":null,"edi_invoice":false,"bill_code":"good"}}
为了完整这里的缘故是我做过什么来解决这个问题：
由达林提供的信息，我意识到这是一个更大的问题不仅仅是字节？为int？转换。这对于由默认联编程序提供的任何非整型转换都是一个问题。正因为如此，我做了一个自定义活页夹，它应该处理字节，小数等数字。请看下图：
public class APICustomerDetailsDTOBinder : IModelBinder
{
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
APICustomerDetailsDTO model = (APICustomerDetailsDTO)bindingContext.Model ??
(APICustomerDetailsDTO)DependencyResolver.Current.GetService(typeof(APICustomerDetailsDTO));
bool hasPrefix = bindingContext.ValueProvider.ContainsPrefix(bindingContext.ModelName);
string searchPrefix = (hasPrefix) ? bindingContext.ModelName + "." : "";
int customerid = 0;
int.TryParse(GetValue(bindingContext, searchPrefix, "customerid"), out customerid);
model.customerid = customerid;
string customername = GetValue(bindingContext, searchPrefix, "customername");
if (!String.IsNullOrEmpty(customername))
{ model.customername = customername; }
else
{ model.customername = null; }
decimal globalcredit;
if (decimal.TryParse(GetValue(bindingContext, searchPrefix, "globalcredit"), out globalcredit))
{ model.globalcredit = globalcredit; }
else
{ model.globalcredit = null; }
byte rating;
if (byte.TryParse(GetValue(bindingContext, searchPrefix, "rating"), out rating))
{ model.rating = rating; }
else
{ model.rating = null; }
byte dnbscore;
if (byte.TryParse(GetValue(bindingContext, searchPrefix, "dnbscore"), out dnbscore))
{ model.dnbscore = dnbscore; }
else
{ model.dnbscore = null; }
byte region;
if (byte.TryParse(GetValue(bindingContext, searchPrefix, "region"), out region))
{ model.region = region; }
else
{ model.region = null; }
bool isnotactive;
if (bool.TryParse(GetValue(bindingContext, searchPrefix, "isnotactive"), out isnotactive))
{ model.isnotactive = isnotactive; }
else
{ model.isnotactive = false; }
string salesperson = GetValue(bindingContext, searchPrefix, "salesperson");
if (!String.IsNullOrEmpty(salesperson))
{ model.salesperson = salesperson; }
else
{ model.salesperson = null; }
string newmill_venderid = GetValue(bindingContext, searchPrefix, "newmill_venderid");
if (!String.IsNullOrEmpty(newmill_venderid))
{ model.newmill_venderid = newmill_venderid; }
else
{ model.newmill_venderid = null; }
string newmill_supplierid = GetValue(bindingContext, searchPrefix, "newmill_supplierid");
if (!String.IsNullOrEmpty(newmill_supplierid))
{ model.newmill_supplierid = newmill_supplierid; }
else
{ model.newmill_supplierid = null; }
string edi_receiverid = GetValue(bindingContext, searchPrefix, "edi_receiverid");
if (!String.IsNullOrEmpty(edi_receiverid))
{ model.edi_receiverid = edi_receiverid; }
else
{ model.edi_receiverid = null; }
bool edi_invoice;
if (bool.TryParse(GetValue(bindingContext, searchPrefix, "edi_invoice"), out edi_invoice))
{ model.edi_invoice = edi_invoice; }
else
{ model.edi_invoice = false; }
model.bill_code = GetValue(bindingContext, searchPrefix, "bill_code");
return model;
}
private string GetValue(ModelBindingContext context, string prefix, string key)
{
ValueProviderResult vpr = context.ValueProvider.GetValue(prefix + key);
return vpr == null ? null : vpr.AttemptedValue;
}
private bool GetCheckedValue(ModelBindingContext context, string prefix, string key)
{
bool result = false;
ValueProviderResult vpr = context.ValueProvider.GetValue(prefix + key);
if (vpr != null)
{
result = (bool)vpr.ConvertTo(typeof(bool));
}
return result;
}
}
这JSON序列化问题是我的问题到底是什么。使用字符串的工作是有道理的，因为Parse方法需要字符串值。我可以控制我发布到页面的数据，但是有什么方法可以确保这些值是字符串，当我将它们转换为JSON开始时？你让我意识到这个问题比字节更大？我认为它被限制的领域。谢谢。 – LRFalk01 2012-07-16 20:04:06