我正在编辑一个asp.net MVC项目。有一个javascript对API控制器进行ajax调用。我没有写这个ajax脚本，而且它工作得很好。我已经在数据项目中添加了一些模型（.cs文件），突然之间我收到了这个错误：
<Error>
<Message>An error has occurred.</Message>
<ExceptionMessage>
Could not create a 'IModelBinder' from 'DataSourceRequestModelBinder'. Please ensure it derives from 'IModelBinder' and has a public parameterless constructor.
</ExceptionMessage>
<ExceptionType>System.InvalidOperationException</ExceptionType>
<StackTrace>
at System.Web.Http.ModelBinding.ModelBinderAttribute.GetModelBinder(HttpConfiguration configuration, Type modelType) at System.Web.Http.ModelBinding.ModelBinderAttribute.GetBinding(HttpParameterDescriptor parameter) at System.Web.Http.ModelBinding.DefaultActionValueBinder.GetParameterBinding(HttpParameterDescriptor parameter) at System.Array.ConvertAll[TInput,TOutput](TInput[] array, Converter`2 converter) at System.Web.Http.ModelBinding.DefaultActionValueBinder.GetBinding(HttpActionDescriptor actionDescriptor) at System.Web.Http.Controllers.HttpActionDescriptor.get_ActionBinding() at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem..ctor(HttpControllerDescriptor controllerDescriptor) at System.Web.Http.Controllers.ApiControllerActionSelector.<>c__DisplayClass2.<GetInternalSelector>b__0(Object _) at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory) at System.Web.Http.Controllers.ApiControllerActionSelector.GetInternalSelector(HttpControllerDescriptor controllerDescriptor) at System.Web.Http.Controllers.ApiControllerActionSelector.SelectAction(HttpControllerContext controllerContext) at System.Web.Http.ApiController.ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken) at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsyncInternal(HttpRequestMessage request, CancellationToken cancellationToken) at System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
我不知道我为此做了什么并且无法在线发现此错误。我在StackOverflow上发现了有关IModelBinder的问题，我似乎正在做所有的事情（例如，WebAPI ModelBinder Error）。
导致此错误的原因是什么？如何修复？
这是ajax电话。
$.ajax({
url: "/api/WorkOrderApi/GetNewAdminWorkOrder/" + vLocId + "?usr=" + vUsr + "&usrTyp=" + vUsrTyp,
dataType: "json",
type: "GET",
success: function(model) {
var viewModel = kendo.observable(model);
kendo.bind(form, viewModel);
var woAcct = $('#AcctId');
woAcct.html(viewModel.AccountId);
},
error: function (XMLHttpRequest, textStatus, errorThrown)
{
alert("Status: " + textStatus); alert("Error: " + errorThrown);
}
});
这是控制器中的服务器端代码。如果我在这里设置一个断点，它就不会被击中：
public ARMS.OpenAccess.WrkOrdTemp GetNewAdminWorkOrder(int id, int usr, int usrTyp)
{
var obj = new ARMS.OpenAccess.WrkOrdTemp
{
ProblemDescription = ""
,
WorkOrderStatus = 1
,
WorkOrderDate = DateTime.Today
,
WorkOrderPriority = 7
};
int compToUse = 0;
string companyNameToUse = "";
int locToUse = 0;
string locationNameToUse = "";
string acctIdToUse = "";
var locObj = new List<ClsDataUtil>();
obj.Companies = rep.GetCustomersByUsrIdandType(usr, usrTyp, out compToUse, out acctIdToUse, out locToUse, out locObj);
if (id > 0)
{
compToUse = rep.GetCompanyIdByLocationId(id);
acctIdToUse = rep.GetAccountIdByCompanyId(compToUse);
locObj = (List<ClsDataUtil>)rep.GetCoLocationByCompanyId(compToUse);
locToUse = id;
}
else if (id == 0)
{
compToUse = obj.Companies.FirstOrDefault().Id;
acctIdToUse = rep.GetAccountIdByCompanyId(compToUse);
locObj = (List<ClsDataUtil>)rep.GetCoLocationByCompanyId(compToUse);
locToUse = locObj.FirstOrDefault().Id;
}
companyNameToUse = rep.GetCompanyNameById(compToUse);
locationNameToUse = rep.GetLocationNameByLocationID(locToUse);
obj.CompanyName = companyNameToUse;
obj.LocationName = locationNameToUse;
obj.Locations = locObj;
obj.WoTempId = rep.UpdateWoTempCompandLoc(0, compToUse, locToUse);
obj.ReferenceNumber = GetLocPo(locToUse);
obj.CompanyId = compToUse;
obj.AccountId = acctIdToUse;
obj.LocationId = locToUse;
obj.Vendors = (obj.LocationId == null || obj.LocationId == 0) ? rep.GetLocVendors() : rep.GetLocVendorsByPostal(obj.LocationId, obj.ServiceType);
if (obj.Vendors.Count > 0)
obj.VendorId = obj.Vendors.Select(x => x.Id).Min();
obj.LaborWorkCodes = rep.GetCodeWorkByCodeTypeId(10).OrderBy(x => x.Name);
obj.ServiceTypes = rep.GetWoServiceTypes();
rep.UpdateWoTempServiceType(obj.WoTempId, obj.ServiceType);
obj.PriorityTypes = rep.GetCodePriorityByForType("WorkOrder");
var StatusTypes1 = rep.GetWorkCodeStatusActiveByType("WorkOrder").Where(x => !x.Name.ToLower().Contains("complete")).OrderByDescending(o => o.Name);
var StatusTypes2 = rep.GetWorkCodeStatusActiveByType("WorkOrder").Where(x => x.Name.ToLower().Contains("to be approved"));
IQueryable<ClsDataUtil> StatusTypes = StatusTypes1;
ClsDataUtil statusType2 = StatusTypes2.FirstOrDefault();
List<ClsDataUtil> lstStatusTypes = StatusTypes.ToList();
lstStatusTypes.Add(statusType2);
obj.StatusTypes = lstStatusTypes.AsQueryable();
obj.RateTypes = rep.GetCodeTypesById(17);
obj.Techs = rep.GetLocResourceTechsByVendor(obj.VendorId);
obj.UseLocContract = "No";
if (rep.HasLocContract(locToUse))
{
obj.LstCustomerContract = rep.GetRWOCoLocationContractByLocId(locToUse);
obj.UseLocContract = "Yes";
}
else
{
obj.LstCustomerContract = rep.GetRWOCustomerContractByCompId(compToUse);
}
var venId = rep.GetCompanyIdByLocationId(obj.VendorId);
obj.LstVendorContract = rep.GetVendorContracts(venId, compToUse);
return obj;
} // GetNewAdminWorkOrder
这是从IModelBinder类派生的DataSourceRequestModelBinder.cs。我没有对此进行任何修改，因为它正在发挥作用。
using System;
using System.Collections.Generic;
using System.Web;
using System.Linq;
using System.Web.Http.Controllers;
using System.Web.Http.ModelBinding;
using Kendo.Mvc;
using Kendo.Mvc.Infrastructure;
using Kendo.Mvc.UI;
namespace ARMS.ModelBinders
{
public class DataSourceRequestModelBinder : IModelBinder
{
public DataSourceRequestModelBinder()
{
}
public bool BindModel(HttpActionContext actionContext, ModelBindingContext bindingContext)
{
DataSourceRequest request = new DataSourceRequest();
string sort, group, filter, aggregates;
int currentPage;
int pageSize;
if (TryGetValue(bindingContext, GridUrlParameters.Sort, out sort))
{
request.Sorts = GridDescriptorSerializer.Deserialize<SortDescriptor>(sort);
}
if (TryGetValue(bindingContext, GridUrlParameters.Page, out currentPage))
{
request.Page = currentPage;
}
if (TryGetValue(bindingContext, GridUrlParameters.PageSize, out pageSize))
{
request.PageSize = pageSize;
}
if (TryGetValue(bindingContext, GridUrlParameters.Filter, out filter))
{
request.Filters = FilterDescriptorFactory.Create(filter);
}
if (TryGetValue(bindingContext, GridUrlParameters.Group, out group))
{
request.Groups = GridDescriptorSerializer.Deserialize<GroupDescriptor>(group);
}
if (TryGetValue(bindingContext, GridUrlParameters.Aggregates, out aggregates))
{
request.Aggregates = GridDescriptorSerializer.Deserialize<AggregateDescriptor>(aggregates);
}
bindingContext.Model = request;
return true;
}
private bool TryGetValue<T>(ModelBindingContext bindingContext, string key, out T result)
{
var value = bindingContext.ValueProvider.GetValue(key);
if (value == null)
{
result = default(T);
return false;
}
result = (T)value.ConvertTo(typeof(T));
return true;
}
}
}