我正在从v1-3升级到v4,但我遇到了一些问题.
我的理解是DateTime不受支持,我必须始终使用DateTimeOffset.精细.
但在我在DateTime中存储sql日期数据类型之前,现在看来我得到了这个错误：
Member Mapping specified is not valid. The type 'Edm.DateTimeOffset[Nullable=False,DefaultValue=,Precision=]' of member 'CreatedDate' in type 'MyEntity' is not compatible with 'sqlServer.date[Nullable=False,Precision=0]'
为此做了什么工作？我需要能够专门存储数据库中的日期(时间和地点并不重要).如果我能得到Edm.Date以及返回的数据类型会很棒,但我之前没有.
谢谢.
编辑：示例类
之前：
public class Ticket
{
[Key,DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int Id { get; set; }
[required,MaxLength(50)]
public string Reference { get; set; }
[Column(TypeName = "date")]
public DateTime LoggedDate { get; set; }
}
后：
public class Ticket
{
[Key,MaxLength(50)]
public string Reference { get; set; }
[Column(TypeName = "date")]
public DateTimeOffset LoggedDate { get; set; }
}
这在EF中无效.
解决方法
一种选择是在实体中定义新属性.说标题映射到EF：
public partial class Title
{
public int Id { get; set; }
public string Name { get; set; }
public Nullable<System.DateTime> CreatedOn { get; set; }
}
public partial class Title
{
[NotMapped]
public DateTimeOffset? EdmCreatedOn
{
// Assume the CreateOn property stores UTC time.
get
{
return CreatedOn.HasValue ? new DateTimeOffset(CreatedOn.Value,TimeSpan.FromHours(0)) : (DateTimeOffset?)null;
}
set
{
CreatedOn = value.HasValue ? value.Value.UtcDateTime : (DateTime?)null;
}
}
}
public static IEdmModel GetModel()
{
ODataConventionModelBuilder builder = new ODataConventionModelBuilder();
EntityTypeConfiguration<Title> titleType= builder.EntityType<Title>();
titleType.Ignore(t => t.CreatedOn);
titleType.Property(t => t.EdmCreatedOn).Name = "CreatedOn";
builder.EntitySet<Title>("Titles");
builder.Namespace = typeof(Title).Namespace;
return builder.GetEdmModel();
}
}
控制器看起来像：
public class TitlesController : ODataController
{
CustomerManagementSystemEntities entities = new CustomerManagementSystemEntities();
[EnableQuery(PageSize = 10,MaxExpansionDepth = 5)]
public IHttpActionResult Get()
{
IQueryable<Title> titles = entities.Titles;
return Ok(titles);
}
public IHttpActionResult Post(Title title)
{
entities.Titles.Add(title);
return Created(title);
}
}
