Silverlight 4.0 ICommand不在datagrid celltemplate中工作
这是我的主页。xaml:-Silverlight 4.0 ICommand不在datagrid celltemplate中工作,silverlight-4.0,mvvm,Silverlight 4.0,Mvvm,这是我的主页。xaml:- <sdk:DataGrid Margin="17,17,20,76" AutoGenerateColumns="False" ItemsSource="{Binding Students}"> <sdk:DataGrid.Columns> <sdk:DataGridTextColumn Binding="{Binding StudName}" Header="Student Na
<sdk:DataGrid Margin="17,17,20,76" AutoGenerateColumns="False" ItemsSource="{Binding Students}">
<sdk:DataGrid.Columns>
<sdk:DataGridTextColumn Binding="{Binding StudName}" Header="Student Name">
</sdk:DataGridTextColumn>
<sdk:DataGridTemplateColumn>
<sdk:DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Button CommandParameter="{Binding}" Command="{Binding Path=DataContext.AddCommand,ElementName=root}"
Content="Add Student" />
</DataTemplate>
</sdk:DataGridTemplateColumn.CellTemplate>
</sdk:DataGridTemplateColumn>
</sdk:DataGrid.Columns>
在代码隐藏中,我将datacontext设置为viewmodel实例
This is my viewmodel :-
using SampleApp.Misc;
using SampleApp.Model;
using SampleApp.Web;
using System.Collections.ObjectModel;
using SampleApp.Commands;
namespace SampleApp.VM
{
public class MainPageViewModel : ViewModelBase
{
private StudentModel _model = new StudentModel();
public MainPageViewModel()
{
_model.GetStudentAsyncComplete += _model_GetStudentAsyncComplete;
_model.GetStudentAsync();
}
private RelayCommand<Student> _addCommand = null;
public RelayCommand<Student> AddCommand
{
get
{
if (_addCommand == null)
{
_addCommand = new RelayCommand<Student>(student =>
{
}, student => student != null);
}
return _addCommand;
}
}
private ObservableCollection<Student> _students;
public ObservableCollection<Student> Students
{
get { return _students; }
set
{
_students = value;
RaisePropertyChanged("Students");
}
}
void _model_GetStudentAsyncComplete(object sender, EntityResultArgs<Web.Student> e)
{
if (e.Error == null)
{
Students = new ObservableCollection<Student>(e.Results);
}
}
}
}
这是我的视图模型:-
使用SampleApp.Misc;
使用SampleApp.Model;
使用SampleApp.Web;
使用System.Collections.ObjectModel;
使用SampleApp.Commands;
名称空间SampleApp.VM
{
公共类MainPageViewModel:ViewModelBase
{
private StudentModel _model=new StudentModel();
公共MainPageViewModel()
{
_model.GetStudentAsyncComplete+=\u model\u GetStudentAsyncComplete;
_model.GetStudentAsync();
}
private RelayCommand _addCommand=null;
公共RelayCommand AddCommand
{
得到
{
如果(_addCommand==null)
{
_addCommand=new RelayCommand(学生=>
{
},student=>student!=null);
}
返回_addCommand;
}
}
私立大学学生;
公选学生
{
获取{return\u students;}
设置
{
_学生=价值观;
RaisePropertyChanged(“学生”);
}
}
void\u model\u GetStudentAsyncComplete(对象发送方,EntityResultArgs e)
{
如果(e.Error==null)
{
学生=新的可观察集合(如结果);
}
}
}
}
为什么我的AddStudent命令没有在ViewModel中触发?有什么想法吗?如果我把它放在Datagrid之外,它绝对可以正常工作。请查看
您需要DataContextProxy在DataGridCell内触发命令。ElementBinding不起作用。好的,但我仍然无法理解ElementBinding为什么不起作用?你能回答吗?