[英]System.InvalidCastException "Object must implement IConvertible." when deserializing a Dictionary using a BinaryFormatter
[英]moving property to anther property in class throws exception “System.InvalidCastException: 'Object must implement IConvertible.'”?
我试图找到的将DynamicProperties属性移动到JSONdata属性的方法,因为当涉及DynamicProperties时,我具有此反射功能来完成这项工作,它会引发异常“ System.InvalidCastException:'对象必须实现IConvertible。'”有人可以帮忙我?
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;
}
客户班
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();
}
}
当您收到IConvertable错误时,表示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,则会收到错误消息,因为无法将对象分配给字符串,则必须使用Iconvertible
。 例如:
String.ToString();
隐式实现Iconvertible
。
我不能确切地说出您的代码在哪里失败,您也没有提到它,我只能告诉您在客户端方法中的某个地方,您试图分配两种不同的类型,但是您不能这样做。
在服务器和客户端类上都使用debug,并检查要在其中分配两种不同类型的位置,然后实现所需的Iconvertible,这意味着进行所需的转换。
此处代码中的唯一问题是,您尝试分配给不同的类型。
我的猜测是,这行引起了麻烦:
if (this.JsonData == null)
{
_dynamicProperties = new Dictionary<string, object>();
}
else
{
_dynamicProperties = Mapper.Map<IDictionary<string, object>>(JObject.Parse(this.JsonData));
}
实际上,当您试图将_dynamicProperties分配给字典对象时,您将_dynamicProperties声明为IDictionary对象。
字典和字典对象之间有细微的差别,它们不是同一类型。 这是需要完成的更改:
if (this.JsonData == null)
{
_dynamicProperties = new IDictionary<string, object>();
}
else
{
_dynamicProperties = Mapper.Map<IDictionary<string, object>>(JObject.Parse(this.JsonData));
}
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