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我正在使用Entity Framework，RIA Services和MVVM-Light工具包創建Silverlight 4應用程序。 > *資源 使用RIA服務插入/更新組合屬性
- 伯1：用一個複雜的對象圖，包含下面的結構的應用程序處理 - > *分配
- WorkplanItems 1 - > *分配
我希望能夠（使用包含屬性/指令）來加載工作，這個工作精細。從特定作業的根加載完整圖形。然而，當我更改提交回，我得到一個錯誤
Entity for operation '0' has multiple parents
它已經從this post我的理解是，在我的元數據組成的屬性是什麼應該允許我提出這是一個完整的圖形，然後處理更新的服務器上的所有對象正確地從我的Silverlight應用程序進行一次往返。我的目標是不要在每次更改時提交更改，但要允許用戶對作業進行一系列更改，並將其與相關部分進行更改，然後提交或取消更改。
請讓我知道，如果你知道我忽略了這個問題嗎？這裏是我設置的元數據：
// The MetadataTypeAttribute identifies AssignmentMetadata as the class
// that carries additional metadata for the Assignment class.
[MetadataTypeAttribute(typeof(Assignment.AssignmentMetadata))]
public partial class Assignment
{
// This class allows you to attach custom attributes to properties
// of the Assignment class.
//
// For example, the following marks the Xyz property as a
// required property and specifies the format for valid values:
// [Required]
// [RegularExpression("[A-Z][A-Za-z0-9]*")]
// [StringLength(32)]
// public string Xyz { get; set; }
internal sealed class AssignmentMetadata
{
// Metadata classes are not meant to be instantiated.
private AssignmentMetadata()
{
}
public decimal CostBudgeted { get; set; }
public decimal CostRemaining { get; set; }
public decimal HoursBudgeted { get; set; }
public decimal HoursRemaining { get; set; }
public bool IsComplete { get; set; }
public int ItemID { get; set; }
public Job Job { get; set; }
public int JobID { get; set; }
public Resource Resource { get; set; }
public int ResourceID { get; set; }
public Workplan Workplan { get; set; }
public int WorkplanID { get; set; }
public WorkplanItem WorkplanItem { get; set; }
}
}
// The MetadataTypeAttribute identifies JobMetadata as the class
// that carries additional metadata for the Job class.
[MetadataTypeAttribute(typeof(Job.JobMetadata))]
public partial class Job
{
// This class allows you to attach custom attributes to properties
// of the Job class.
//
// For example, the following marks the Xyz property as a
// required property and specifies the format for valid values:
// [Required]
// [RegularExpression("[A-Z][A-Za-z0-9]*")]
// [StringLength(32)]
// public string Xyz { get; set; }
internal sealed class JobMetadata
{
// Metadata classes are not meant to be instantiated.
private JobMetadata()
{
}
[Display(AutoGenerateField = false)]
[Include]
[Composition]
public EntityCollection<Assignment> Assignments { get; set; }
[Display(Name="Client Job", Order=2, Description="Is this a client job?")]
[DefaultValue(true)]
public bool IsRealJob { get; set; }
[Display(AutoGenerateField = false)]
[Include]
public JobDetail JobDetail { get; set; }
[Display(AutoGenerateField = false)]
public int JoblID { get; set; }
[Display(Name="Job Title", Order=1, Description="What should this job be called?")]
public string Title { get; set; }
[Display(AutoGenerateField = false)]
[Include]
[Composition]
public EntityCollection<WorkplanItem> WorkplanItems { get; set; }
[Display(AutoGenerateField = false)]
[Include]
[Composition]
public EntityCollection<Workplan> Workplans { get; set; }
[Display(AutoGenerateField = false)]
[Include]
[Composition]
public EntityCollection<Resource> Resources { get; set; }
}
}
// The MetadataTypeAttribute identifies JobDetailMetadata as the class
// that carries additional metadata for the JobDetail class.
[MetadataTypeAttribute(typeof(JobDetail.JobDetailMetadata))]
public partial class JobDetail
{
// This class allows you to attach custom attributes to properties
// of the JobDetail class.
//
// For example, the following marks the Xyz property as a
// required property and specifies the format for valid values:
// [Required]
// [RegularExpression("[A-Z][A-Za-z0-9]*")]
// [StringLength(32)]
// public string Xyz { get; set; }
internal sealed class JobDetailMetadata
{
// Metadata classes are not meant to be instantiated.
private JobDetailMetadata()
{
}
[Display(Name="Client", Order=1,Description="Name of the Client")]
public string Client { get; set; }
[Display(Name = "Client Fee", Order = 5, Description = "Client Fee from Engagement Letter")]
[DisplayFormat(DataFormatString="C",NullDisplayText="<Not Set>",ApplyFormatInEditMode=true)]
public Nullable<decimal> ClientFee { get; set; }
[Display(AutoGenerateField=false)]
public int ClientIndex { get; set; }
[Display(AutoGenerateField = true)]
public string EFOLDERID { get; set; }
[Display(Name = "Engagement Name", Order = 4, Description = "Friendly name of the Engagement")]
public string Engagement { get; set; }
[Display(Name = "Eng Type", Order = 3, Description = "Type of Work being done")]
public string EngagementType { get; set; }
[Display(AutoGenerateField = false)]
public Job Job { get; set; }
[Display(AutoGenerateField = false)]
public int JobID { get; set; }
[Display(AutoGenerateField = false)]
public int PEJobID { get; set; }
[Display(Name = "Service", Order = 2, Description = "Service Type")]
public string Service { get; set; }
[Display(Name = "Timing of the Work", Order = 6, Description = "When will this work occur?")]
public string Timing { get; set; }
}
}
// The MetadataTypeAttribute identifies PendingTimesheetMetadata as the class
// that carries additional metadata for the PendingTimesheet class.
[MetadataTypeAttribute(typeof(PendingTimesheet.PendingTimesheetMetadata))]
public partial class PendingTimesheet
{
// This class allows you to attach custom attributes to properties
// of the PendingTimesheet class.
//
// For example, the following marks the Xyz property as a
// required property and specifies the format for valid values:
// [Required]
// [RegularExpression("[A-Z][A-Za-z0-9]*")]
// [StringLength(32)]
// public string Xyz { get; set; }
internal sealed class PendingTimesheetMetadata
{
// Metadata classes are not meant to be instantiated.
private PendingTimesheetMetadata()
{
}
public decimal PendingHours { get; set; }
public string UserName { get; set; }
public DateTime WorkDate { get; set; }
[Include]
public Workplan Workplan { get; set; }
public int WorkplanID { get; set; }
}
}
// The MetadataTypeAttribute identifies ResourceMetadata as the class
// that carries additional metadata for the Resource class.
[MetadataTypeAttribute(typeof(Resource.ResourceMetadata))]
public partial class Resource
{
// This class allows you to attach custom attributes to properties
// of the Resource class.
//
// For example, the following marks the Xyz property as a
// required property and specifies the format for valid values:
// [Required]
// [RegularExpression("[A-Z][A-Za-z0-9]*")]
// [StringLength(32)]
// public string Xyz { get; set; }
internal sealed class ResourceMetadata
{
// Metadata classes are not meant to be instantiated.
private ResourceMetadata()
{
}
[Include]
[Composition]
public EntityCollection<Assignment> Assignments { get; set; }
[Include]
public Job Job { get; set; }
public int JobID { get; set; }
public decimal Rate { get; set; }
public int ResourceID { get; set; }
public string Title { get; set; }
public string UserName { get; set; }
}
}
// The MetadataTypeAttribute identifies WorkplanMetadata as the class
// that carries additional metadata for the Workplan class.
[MetadataTypeAttribute(typeof(Workplan.WorkplanMetadata))]
public partial class Workplan
{
// This class allows you to attach custom attributes to properties
// of the Workplan class.
//
// For example, the following marks the Xyz property as a
// required property and specifies the format for valid values:
// [Required]
// [RegularExpression("[A-Z][A-Za-z0-9]*")]
// [StringLength(32)]
// public string Xyz { get; set; }
internal sealed class WorkplanMetadata
{
// Metadata classes are not meant to be instantiated.
private WorkplanMetadata()
{
}
[Include]
[Composition]
public EntityCollection<Assignment> Assignments { get; set; }
public string Description { get; set; }
[Include]
public Job Job { get; set; }
public int JobID { get; set; }
public EntityCollection<PendingTimesheet> PendingTimesheets { get; set; }
public Nullable<int> PETaskID { get; set; }
public decimal TtlCost { get; set; }
public decimal TtlHours { get; set; }
public DateTime WorkEnd { get; set; }
public int WorkplanID { get; set; }
[Include]
[Composition]
public EntityCollection<WorkplanItem> WorkplanItems { get; set; }
public DateTime WorkStart { get; set; }
}
}
// The MetadataTypeAttribute identifies WorkplanItemMetadata as the class
// that carries additional metadata for the WorkplanItem class.
[MetadataTypeAttribute(typeof(WorkplanItem.WorkplanItemMetadata))]
public partial class WorkplanItem
{
// This class allows you to attach custom attributes to properties
// of the WorkplanItem class.
//
// For example, the following marks the Xyz property as a
// required property and specifies the format for valid values:
// [Required]
// [RegularExpression("[A-Z][A-Za-z0-9]*")]
// [StringLength(32)]
// public string Xyz { get; set; }
internal sealed class WorkplanItemMetadata
{
// Metadata classes are not meant to be instantiated.
private WorkplanItemMetadata()
{
}
[Include]
[Composition]
public EntityCollection<Assignment> Assignments { get; set; }
public string Description { get; set; }
public int ItemID { get; set; }
[Include]
public Job Job { get; set; }
public int JobID { get; set; }
public string Notes { get; set; }
public short Ordinal { get; set; }
[Include]
public Workplan Workplan { get; set; }
public int WorkplanID { get; set; }
}
}