请考虑以下Datamodel
由于我是新来的,所以我无法发布图像,所以我会尝试另一种方法...
作业实体-jobid - 乔布诺-jobstatus(状态实体的外键)-jobdate
状态实体-Statusid-Statuscaption
关系作业实体 * -------------------------------状态实体
我有一个WCF服务,该服务公开了我的JobsViewModel访问的模型
namespace PM.DataService
{
[ServiceContract]
public class PMService
{
[OperationContract]
public ObservableCollection<Job> GetAllJobs()
{
using (var context = new logisticDBEntities())
{
var result = context.Jobs.ToList();
result.ForEach(e => context.Detach(e));
return new ObservableCollection<Job>(result);
}
}
[OperationContract]
public ObservableCollection<Status> GetStatuses()
{
using (var context = new logisticDBEntities())
{
var result = context.Statuses.ToList();
result.ForEach(e => context.Detach(e));
return new ObservableCollection<Status>(result);
}
}
}
}
namespace PM.UI.ViewModel
{
public class JobsViewModel:INotifyPropertyChanged
{
private PMServiceClient serviceClient = new PMServiceClient();
public JobsViewModel()
{
this.RefreshStatuses();
this.RefreshAllJobs();
}
private void RefreshAllJobs()
{
this.serviceClient.GetAllJobsCompleted += (s, e) =>
{
this.allJobs = e.Result;
};
this.serviceClient.GetAllJobsAsync();
}
private void RefreshStatuses()
{
this.serviceClient.GetStatusesCompleted += (s, e) =>
{
this.Statuses = e.Result;
};
this.serviceClient.GetStatusesAsync();
}
private ObservableCollection<Job> allJobs;
public ObservableCollection<Job> AllJobs
{
get{
return this.allJobs;
}
set
{
this.allJobs = value;
OnPropertyChanged("AllJobs");
}
}
private ObservableCollection<Status> statuses;
public ObservableCollection<Status> Statuses
{
get
{
return this.statuses;
}
set
{
this.statuses = value;
this.OnPropertyChanged("Statuses");
}
}
private void OnPropertyChanged(string propertyName)
{
if (this.PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
public event PropertyChangedEventHandler PropertyChanged;
}
}
我在我的MainWindow的Xaml中包括了JobsViewModel
<Window x:Class="PM.FullClient.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:PM.UI"
xmlns:vms="clr-namespace:PM.UI.ViewModel"
Title="MainWindow" Height="475" Width="575">
<Window.DataContext>
<vms:JobsViewModel/>
</Window.DataContext>
....
现在,我可以通过绑定以显示所有状态
来轻松地填充我的MainWindow<DataGrid ItemsSource="{Binding Path=Statuses}" Margin="7,8,9,8" AutoGenerateColumns="True">
它有效,但是我无法显示输出cos,我无法在此处发布图像
但是,当我尝试在工作中做同样的事情时...什么都没有发生。数据杂志为空
<DataGrid AutoGenerateColumns="True" ItemsSource="{Binding Path=AllJobs}" Margin="6">
</DataGrid>
我已经经历了许多搜索吨的四人和网站,最后我在这里。
是否可以是状态>工作与状态之间的工作关系?如果是这样,我该如何解决此问题,如果不是我在做错什么?
问题是在RefReshallJobs()回调中,您设置了 alljobs field(souter-case'a'),而不是 alljobs属性(上面的'a'),然后onpropertychanged()从不从属性 setter setter