当我尝试从表存储中读取时，出现以下异常。我在添加DateTime?属性后得到它。
例外：
The current value 'String.Empty' type is not compatible with the expected 'System.DateTime' type.
内部异常：
The string '' is not a valid AllXsd value.
我想到了以下解决方案：
- 我让提供者将不存在的值映射到 null
- 用日期更新对象（但我无法获取它？）
有没有人对如何解决这个问题有更好的想法？
堆栈跟踪：
System.InvalidOperationException: The current value 'String.Empty' type is not compatible with the expected 'System.DateTime' type. ---> System.FormatException: The string '' is not a valid AllXsd value.
at System.Xml.Schema.XsdDateTime..ctor(String text, XsdDateTimeFlags kinds)
at System.Xml.XmlConvert.ToDateTime(String s, XmlDateTimeSerializationMode dateTimeOption)
at System.Data.Services.Client.ClientConvert.ChangeType(String propertyValue, Type propertyType)
--- End of inner exception stack trace ---
at System.Data.Services.Client.ClientConvert.ChangeType(String propertyValue, Type propertyType)
at System.Data.Services.Client.AtomMaterializer.MaterializeDataValue(Type type, AtomContentProperty atomProperty, DataServiceContext context)
at System.Data.Services.Client.AtomMaterializer.MaterializeDataValues(ClientType actualType, List`1 values, Boolean ignoreMissingProperties, DataServiceContext context)
at System.Data.Services.Client.AtomMaterializer.MaterializeResolvedEntry(AtomEntry entry, Boolean includeLinks)
at System.Data.Services.Client.AtomMaterializer.Materialize(AtomEntry entry, Type expectedEntryType, Boolean includeLinks)
at System.Data.Services.Client.AtomMaterializer.DirectMaterializePlan(AtomMaterializer materializer, AtomEntry entry, Type expectedEntryType)
at System.Data.Services.Client.AtomMaterializerInvoker.DirectMaterializePlan(Object materializer, Object entry, Type expectedEntryType)
at System.Data.Services.Client.ProjectionPlan.Run(AtomMaterializer materializer, AtomEntry entry, Type expectedType)
at System.Data.Services.Client.AtomMaterializer.Read()
at System.Data.Services.Client.MaterializeAtom.MoveNextInternal()
at System.Data.Services.Client.MaterializeAtom.MoveNext()
at System.Linq.Enumerable.<CastIterator>d__b1`1.MoveNext()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
模型
class Car : TableServiceEntity {
public DateTime? LastUpdated { get; set; }
public DateTime? LastUsed { get; set; }
// more properties
}
询问
var sx = this.GetServiceContext();
return (from x in sx.CreateQuery<Car>("Table") select x).ToList();