Question

以下是我的2个型号：

VendorMapMessage：

    public int ID { get; set; }
    public string Name { get; set; }
    public int VendorMapID { get; set; }
    public VendorMap VendorMap { get; set; }
    public int DocumentTypeID { get; set; }
    public DocumentType DocumentType { get; set; }
    public int IncidentTypeID { get; set; }
    public IncidentType IncidentType { get; set; }
    public ICollection<VendorMapMessagePropertyService> VendorMapMessagePropertyServices { get; set; }
    public string MessageContent { get; set; }'

VendorMapMessagePropertyService：

    public int ID { get; set; }        
    public int VendorMapMessageID { get; set; }
    public VendorMapMessage VendorMapMessage { get; set; }
    public int PropertyTypeID { get; set; }
    public PropertyType PropertyType { get; set; }
    public int ServiceTypeID { get; set; }
    public ServiceType ServiceType { get; set; }

这是我的业务逻辑：

 public VendorMapMessage SaveConfirmationMessage(VendorMapMessage source)
    {
        VendorMapMessage result = null;
        try
        {
            using (var db = new ClientAdminContext())
            {
                VendorMapMessage temp = null;
                if (source.ID == default(int))
                {
                    temp = new VendorMapMessage();
                    db.VendorMapMessages.Add(temp);
                    //techdebt remove
                    temp.ID = 84;
                    temp.IncidentTypeID = source.IncidentTypeID;
                    temp.DocumentTypeID = source.DocumentTypeID;
                    temp.MessageContent = source.MessageContent;
                }
                else
                {
                    temp = db.VendorMapMessages.Single(o => o.ID == source.ID);
                }
                temp.IncidentTypeID = source.IncidentTypeID;
                temp.DocumentTypeID = source.DocumentTypeID;
                temp.MessageContent = source.MessageContent;                    
                db.SaveChanges();
                result = temp;
            }
        }
        catch (Exception ex)
        {
            //log

            throw;
        }
        return result;

以下是我的观点：

<label for="description" class="col-sm-4">Property Type</label>
   <div class="col-md-7">
      <select class="form-control" name="PropertyTypeID" multiple id="prop_type">
       @foreach (PropertyType item in propertyTypes)
          {
          if (@Model.VendorMapMessagePropertyServices.Any(o => o.PropertyTypeID == item.ID))
          {
            <option selected="selected" value=@item.ID>@item.Name</option>
           }
          else
          {
         <option value=@item.ID>@item.Name</option>
           }
         }
       </select>
    </div>

ICollection VendorMapMessagePropertyService显示所有可用的属性类型。但我无法保存列出的属性类型。我错过了业务逻辑中的一行，它必须使用vendormapmessageID作为主键并链接到vendormapmessagepropertyservices的propertytypeID。

混淆连接vendormapmessagepropertyservice中的PropertytypeID。（我知道模型名称是垃圾。我不认为这会变得复杂）

Answer 1

您的问题不太明确，但听起来您想要保存与VendorMapMessagePropertyService绑定的VendorMapMessage的集合？如果是这样，你可以这样做：

temp.VendorMapMessagePropertyServices = source.VendorMapMessagePropertyServices;

保存对上下文的更改后，这将保存新的VendorMapMessagePropertyService并将其与您的VendorMapMessage相关联。

根据评论进行修改：您希望更新已存在的PropertyTypeID上的VendorMapMessagePropertyService吗？如果是这样，你需要从上下文中获取它们，然后更新它们，如下所示：

// Get existing property services in the database
IEnumerable<VendorMapMessagePropertyService> allExistingPropertyServices = db.VendorMapMessagePropertyServices;
// Loop through property services from the source...
foreach (VendorMapMessagePropertyService propertyService in source.VendorMapMessagePropertyServices) {
    // Find existing property service
    VendorMapMessagePropertyService existingPropertyService = allExistingPropertyServices.FirstOrDefault(x => x.ID == propertyService.ID);

    // If found, update it
    if (existingPropertyService != null) {
        existingPropertyService.PropertyTypeID = propertyService.PropertyTypeID;
    }
}

如果您还想添加源中但在数据库中不存在的属性服务，则需要修改此项。

MVC -Model with ICollection

1 个答案: