我试图用包含配置列表的项目列表填充列表框。
所以我要做的是首先用我的项目列表和所有子项填充列表框。一切进展顺利。但对于每个配置,我都需要调用rest服务来获取状态。因此,我不想一次发出所有这些请求(首先绑定项目和配置,然后针对每个配置获取状态并异步更新配置状态属性)。但当我开始加载所有配置(可能高达200)时,列表框会冻结。
RED:经过一些思考,当每个列表项(子项)对用户可见时,最好加载它的状态,但我找不到任何好的事件。关于如何处理这件事有什么建议吗
这是我的解决方案:
MainViewModel
//Fired on pageLoad
_projectRepository.FindBy(_serverCityConfiguration, BuildListBoxGroups);
private void BuildListBoxGroups(IEnumerable<Project> projects)
{
var projectGroups = new List<ListBoxGroup<BuildConfigurationModel>>();
foreach (Project project in projects)
{
var buildConfigurations = project.BuildConfigurations.Select(buildConfiguration
=> new BuildConfigurationModel(buildConfiguration.Id, buildConfiguration.Name, new List<BuildModel>())).ToList();
projectGroups.Add(new ListBoxGroup<BuildConfigurationModel>(
new ProjectModel(project.Id, project.Name), buildConfigurations));
}
Deployment.Current.Dispatcher.BeginInvoke(() =>
Projects = projectGroups.ToObservableCollection());
//It's here my problem starts, where my listbox freezes
ThreadPool.QueueUserWorkItem(FireBuildsFetching, projects);
}
private void FireBuildsFetching(object stuff)
{
var projects = stuff as IEnumerable<Project>;
foreach (var project in projects)
{
foreach (var buildConfiguration in project.BuildConfigurations)
{
ThreadPool.QueueUserWorkItem(RetrieveBuils, buildConfiguration);
}
}
}
private void RetrieveBuils(object buildConfiguration)
{
Debug.WriteLine("RetrieveBuils");
var localBuildConfig = buildConfiguration as BuildConfiguration;
//Here is some logic to find correct buildconfiguration to add status to
...
Deployment.Current.Dispatcher.BeginInvoke(() =>
buildConfigurationModel.AddBuilds(buildModels));
}
当所有对rest服务的调用都完成时,列表框会同时更新所有状态。
有人能很好地解决我的问题吗?
您能在后台循环中添加50ms的等待(thread.Sleep)吗。在我看来,你的列表框不断被背景威胁更新。从线程封送+更新UI声明占用资源。通过最小化往返次数来优化代码,批量更新数据(每10或20项)会有所帮助。希望这能有所帮助。