Asp.NETWebAPI处理post请求大约需要2分钟

当我试图发布（或放置）我的viewModel时，通过JSON表示

PUT /adm/api/places/1 HTTP/1.1
Host: localhost:11483
Content-Type: application/json
Content-Length: 64

{
  id: 1,
  name: "000000",
  description: "des1",
  published: false
}

给我的控制器

[Route("adm/api/places", Name = "PlacesApi")]
public object PostPlace(PlaceVM place)
{
   // breakpoint hits here only after about 2 minutes
}

在控制器的操作开始处理请求之前，我必须等待大约2分钟。 我发现造成这种情况的原因是对.net framework函数System.Security.Cryptography.CapiHashAlgorithm.HashCore的多次调用：

[SecuritySafeCritical]
public void HashCore(byte[] array, int ibStart, int cbSize) 
{
    Contract.Assert(m_hashHandle != null);

    if (array == null) {
        throw new ArgumentNullException("array");
    }
    if (ibStart < 0 || ibStart > array.Length - cbSize) {
        throw new ArgumentOutOfRangeException("ibStart");
    }
    if (cbSize < 0 || cbSize > array.Length) {
        throw new ArgumentOutOfRangeException("cbSize");
    }

    byte[] hashData = new byte[cbSize];
    Buffer.BlockCopy(array, ibStart, hashData, 0, cbSize);

    if (!CapiNative.UnsafeNativeMethods.CryptHashData(m_hashHandle, hashData, cbSize, 0)) {
        throw new CryptographicException(Marshal.GetLastWin32Error());
    }
}

[SecuritySafeCritical]
public void HashCore（字节[]数组，int-ibStart，int-cbSize）
{
Assert（m_hashHandle！=null）；
if（数组==null）{
抛出新的ArgumentNullException（“数组”）；
}
if（ibStart<0 | | ibStart>array.Length-cbSize）{
抛出新ArgumentOutOfRangeException（“ibStart”）；
}
if（cbSize<0 | | cbSize>array.Length）{
抛出新ArgumentOutOfRangeException（“cbSize”）；
}
字节[]哈希数据=新字节[cbSize]；
BlockCopy（数组、ibStart、hashData、0、cbSize）；
if（！capinive.unsafentiveMethods.CryptHashData（m_hashHandle，hashData，cbSize，0））{
抛出新的加密异常（Marshal.GetLastWin32Error（））；
}
}

参数“array”包含大小约为5 MB的字节数组

调用堆栈如下所示：

[管理到本机转换]

System.Core.dll！System.Security.Cryptography.CapiHashAlgorithm.HashCore（字节[]） 数组，int-ibStart，int-cbSize）第124行C# System.Core.dll！System.Security.Cryptography.SHA256CryptoServiceProvider.HashCore（字节[]） 数组，int-ibStart，int-cbSize）第51行C# mscorlib.dll！System.Security.Cryptography.HashAlgorithm.ComputeHash（字节[]） 缓冲区）第85行C# mscorlib.dll！System.Security.Policy.Hash.GenerateHash（System.Type hashType，byte[]assemblyBytes）第338行C# mscorlib.dll！System.Security.Policy.Hash.GenerateHash（System.Type hashType）第316行C# mscorlib.dll！System.Security.Policy.Hash.SHA256.get（）行255 C# [轻量级功能]
System.Web.Http.dll！System.Web.Http.Metadata.Providers.AssociatedMetadataProvider.GetMetadataForPropertiesImpl.AnonymousMethod__0（）未知 System.Web.Http.dll！System.Web.Http.Metadata.ModelMetadata.Model.get（）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext，对象容器， System.Collections.Generic.IEnumerable 验证程序）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateProperties（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext，对象容器， System.Collections.Generic.IEnumerable 验证程序）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateElements（System.Collections.IEnumerable 模型 System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext，对象容器， System.Collections.Generic.IEnumerable 验证程序）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateProperties（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext，对象容器， System.Collections.Generic.IEnumerable 验证程序）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateProperties（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext，对象容器， System.Collections.Generic.IEnumerable 验证程序）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateProperties（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext，对象容器， System.Collections.Generic.IEnumerable 验证程序）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateProperties（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http.Validation.DefaultBodyModelValidator.ValidationContext validationContext）未知 System.Web.Http.dll！System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren（System.Web.Http.Metadata.ModelMetadata 元数据， System.Web.Http

 public class PlaceVM : ViewModelBase<Place>
    {
        public PlaceVM()
        {
        }
        public PlaceVM(Place place)
        {
            ID = place.ID;
            Name = place.Name;
            Description = place.Description;
            PlaceTypeID = place.PlaceTypeID;
            Published = place.Published;          
        }
        [EpHiddenField]
        public long? ID { get; set; }
        [Required]
        [StringLength(100)]
        [EpTextField(Caption = "Название")]
        public string Name { get; set; }
        [Required]
        [StringLength(512, MinimumLength = 30)]
        [EpTextAreaField(Caption = "Описание")]
        public string Description { get; set; }

        [Required]
        [EpLookupField("placeTypes", Caption = "Тип")]        
        public long? PlaceTypeID { get; set; }

        [EpCheckFiled(Caption = "Опубликовано")]
        public bool? Published { get; set; }
    }

public abstract class ViewModelBase<TEntity> where TEntity : class, IEntity,  new()
    {
        private class VmAndEntity
        {
            public PropertyInfo ViewModelProp { get; set; }
            public PropertyInfo EntityProp { get; set; }
        }
        private static readonly log4net.ILog _log =
            log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        protected TEntity _Model;

        protected ViewModelBase(TEntity model, bool fillVmByPropsMap = false)
        {
            if (model == null) // При вызовае JSON.NET сериализатором
            {
                model = new TEntity();
            }
            _Model = model;
            LazyInitializer.EnsureInitialized(ref _entityPropsGetters, () => GetEntityPropGetters(this.GetType()));

            if (fillVmByPropsMap)
                FillVMByPropsMap(model);
        }
        [JsonIgnore]
        public Expression<Func<TEntity, object>>[] EntityPropsGetters
        {
            get
            {
                if (_entityPropsGetters == null)
                    throw new EpFieldNotInitializedException("_entityPropsGetters");

                return _entityPropsGetters;
            }
        }

        private static Expression<Func<TEntity, object>>[] _entityPropsGetters;
        protected void FillVMByPropsMap(TEntity model)
        {
            if (model == null)
                return;
            if (_vmToEntityPropsMap.Count == 0)
            {
                _log.WarnFormat("_vmToEntityPropsMap is empty for VM '{0}'", this.GetType());
#if DEBUG
                throw new EpInvalidStateException("VM '{0}' has no properties which fit model's properties");
#endif
            }
            foreach (var vmAndEntity in _vmToEntityPropsMap)
            {
                var val = vmAndEntity.EntityProp.GetValue(model, null);
                vmAndEntity.ViewModelProp.SetValue(this, val);
            }
        }

        public abstract TEntity FillModel();
        protected TEntity FillModelByPropsMap()
        {
            if (_vmToEntityPropsMap.Count == 0)
            {
                _log.WarnFormat("_vmToEntityPropsMap is empty for VM '{0}'", this.GetType());
#if DEBUG
                throw new EpInvalidStateException("VM '{0}' has no properties which fit model's properties");
#endif
            }
            if (_Model == null)
                _Model = new TEntity();

            foreach (var vmAndEntity in _vmToEntityPropsMap)
            {
                var val = vmAndEntity.ViewModelProp.GetValue(this);
                vmAndEntity.EntityProp.SetValue(_Model, val);
            }
            return _Model;
        }

        private static List<VmAndEntity> _vmToEntityPropsMap;
        private static Expression<Func<TEntity, object>>[] GetEntityPropGetters(Type vmType) 
        {
            List<Expression<Func<TEntity, object>>> res = new List<Expression<Func<TEntity, object>>>();
            _vmToEntityPropsMap = new List<VmAndEntity>();

            var vmProperties = vmType.GetProperties().Where(p => p.CanRead);
            var eProperties = typeof(TEntity).GetProperties().Where(p => p.CanRead);

            foreach (var vmProp in vmProperties)
            {
                var eProp = eProperties.FirstOrDefault(item => item.Name == vmProp.Name);
                // Если в модели нашлось свойство, соотвествующее ViewModelProp, то
                if (eProp != null)
                {
                    _vmToEntityPropsMap.Add(new VmAndEntity() { ViewModelProp = vmProp, EntityProp = eProp});

                    // получим Expression для доступа к этому свойству
                    var parameter = Expression.Parameter(typeof(TEntity));
                    var property = Expression.Property(parameter, eProp);
                    Expression conversion = Expression.Convert(property, typeof(object));
                    var lambda = Expression.Lambda<Func<TEntity, object>>(conversion, parameter);

                    res.Add(lambda);
                }
            }
            return res.ToArray();
        }
    }