将属性移动到类中的anther属性抛出异常“System.InvalidCastException:'Object必须实现IConvertible。'”?

时间:2017-08-16 21:32:50

标签: c# asp.net .net entity-framework odata

我试图找到将DynamicProperties属性移动到JSONdata属性的原因是因为我有这个反射函数来完成作业,当涉及到DynamicProperties时它抛出异常“System.InvalidCastException:'Object必须实现IConvertible。'”有人能帮助我吗?

    public IHttpActionResult Get(ODataQueryOptions<Client> options)
    {
         if(queryNew.ElementType == typeof(Client)){}
        else //if (queryNew.ElementType.Name == "SelectSome`1")
        {
            var results = new List<Client>();
            try
            {
                foreach (var item in queryNew)
                {
                    var dict = ((ISelectExpandWrapper)item).ToDictionary();
                    var model = DictionaryToObject<Client>(dict);
                    results.Add(model);

                }

                return Ok(results);
            }
            catch (Exception)
            {

                throw;
            }
}

    private static T DictionaryToObject<T>(IDictionary<string, object> dict) where T : new()
    {
        T t = new T();
        PropertyInfo[] properties = t.GetType().GetProperties();

        foreach (PropertyInfo property in properties)
        {
            if (!dict.Any(x => x.Key.Equals(property.Name, StringComparison.InvariantCultureIgnoreCase)))
                continue;
            KeyValuePair<string, object> item = dict.First(x => x.Key.Equals(property.Name, StringComparison.InvariantCultureIgnoreCase));
            Type tPropertyType = t.GetType().GetProperty(property.Name).PropertyType;
            Type newT = Nullable.GetUnderlyingType(tPropertyType) ?? tPropertyType;
            if(dict.Any(x => x.Key.Equals("DynamicProperties", StringComparison.InvariantCultureIgnoreCase)))
            {
                object temp = JsonConvert.SerializeObject(item.Value, Formatting.Indented); //Convert.ChangeType(item.Value.ToString(), newT);
                t.GetType().GetProperty("JsonData").SetValue(t, temp, null);
            }
            object newA = Convert.ChangeType(item.Value, newT);
            t.GetType().GetProperty(property.Name).SetValue(t, newA, null);
        }
        return t;
    }

客户端类

public class Client
{
    public Guid Id { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Email { get; set; }
    public string ParticipantId { get; set; }
    public DateTime? BirthDate { get; set; }
    public int Gender { get; set; }
    public byte? Age { get; set; }
    public int Status { get; set; }
    public string Notes { get; set; }
    public DateTime CreatedDate { get; set; }
    public DateTime? UpdatedDate { get; set; }
    public DateTime? DeletedDate { get; set; }
    public bool IsDeleted { get; set; }
    public int? DefaultLanguageId { get; set; }
    public Guid UserId { get; set; }
    public string JsonData { get; set; }

    public virtual ICollection<ClientTag> ClientTags { get; private set; }

    protected IDictionary<string, object> _dynamicProperties;
    public IDictionary<string, object> DynamicProperties
    {
        get
        {
            if (_dynamicProperties == null)
            {
                if (this.JsonData == null)
                {
                    _dynamicProperties = new Dictionary<string, object>();
                }
                else
                {
                    _dynamicProperties = Mapper.Map<IDictionary<string, object>>(JObject.Parse(this.JsonData));
                }

                //_dynamicProperties.Source.ListChanged += (sender, e) => { this.AssessmentData = _dynamicProperties.Source.ToString(); };
            }

            return _dynamicProperties;
        }
    }
    public void UpdateJsonDataFromDynamicProperties()
    {
        this.JsonData = Mapper.Map<JObject>(_dynamicProperties).ToString();
    }
}

1 个答案:

答案 0 :(得分:3)

当您收到IConvertable错误时,这意味着您已尝试将一种类型分配给另一种类型。 例如,如果您尝试将文本框分配给字符串,则会收到错误,因为您无法将对象分配给字符串,您必须使用Iconvertible。 例如:

String.ToString();

隐式实现Iconvertible

我无法确切地说出你的代码失败的地方,你也没有提到它,我只能告诉你,在客户端方法的某个地方,你试图分配两种不同的类型,你就是不能这样做。

在服务器和客户端类上使用debug,并检查您尝试分配两种不同类型的位置,然后实现所需的Iconvertible,即进行所需的转换。

此处代码中唯一的问题是您尝试分配给不同类型。

我的猜测是,这条线造成了麻烦:

 if (this.JsonData == null)
                {
                    _dynamicProperties = new Dictionary<string, object>();
                }
                else
                {
                    _dynamicProperties = Mapper.Map<IDictionary<string, object>>(JObject.Parse(this.JsonData));
                }

当您尝试将_dynamicProperties分配到字典对象时,实际上您将_dynamicProperties声明为IDictionary对象。

Idictionary和字典对象之间存在细微差别,它们的类型不同。这是需要做的改变:

 if (this.JsonData == null)
                    {
                        _dynamicProperties = new IDictionary<string, object>();
                    }
                    else
                    {
                        _dynamicProperties = Mapper.Map<IDictionary<string, object>>(JObject.Parse(this.JsonData));
                    }
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