如何更新\ refresh在多个视图上使用的相同usercontrol [英] How do I update\refresh the same usercontrol used on multiple views
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问题描述
我在数据库中添加了视图2中的记录;
1.记录成功插入并立即显示在同一视图上的usercontrol（DataGrid）中（View2）
2.视图中未显示更改1除非我关闭视图或应用程序并重新启动它。
// INotifyProperty已实施在ViewModelBase类中
View1
< 窗口
xmlns = http：// schemas。 microsoft.com/winfx/2006/xaml/presentation\" xmlns：x = HTTP：//模式.microsoft.com / winfx / 2006 / xaml
xmlns：UC = clr-namespace：HRSimplified。控件
x：Class = HRSimplified.MainWindow
标题 = MainWindow 高度 = 628 宽度 = 986 >
< Grid >
< 网格.ColumnDefinitions >
< ColumnDefinition 宽度 = * / >
< ColumnDefinition 宽度 = 2 * / >
< / Grid.ColumnDefinitions >
< UC：EmployeeGridControl 网格.Column = 1 / >
< / Grid >
< ; / Window >
View2
< Window
x：Class = HRSimplified.Windows.EmployeeDashboard
xmlns = http://schemas.microsoft.com/winfx/2006/xaml/presentation
xmlns：x = http://schemas.microsoft.com/winfx/2006/xaml
xmlns：转换器 = clr-namespace：HRSimplified.Converters
xmlns：d = http://schemas.microsoft.com/expression/blend/2008
xmlns：local = clr-namespace：HRSimplified.View
xmlns：mc = http://schemas.openxmlformats.org/markup-compatibility/2006
xmlns：system = clr-namespace：System; assembly = mscorlib
xmlns：VM = clr-namespace：HRSimplified.ViewModel < span class =code-attribute>
< span class =code-attribute> xmlns：UC = clr-namespace：HRSimplified.Controls
mc：可忽略 = d
标题 = EmployeeDashboard >
< Window.DataContext >
< VM：ViewModel_Employee / >
< / Window.DataContext >
< 网格 >
< Grid.ColumnDefinitions >
< ColumnDefinition 宽度 = * / >
< ColumnDefinition 宽度 = 2 * / >
< / Grid.ColumnDefinitions >
< UC：EmployeeGridControl / >
< ItemsControl ItemsSource = {Binding Path = emp} >
< StackPanel >
< TextBox EditValue = {Binding emp.Name，NotifyOnTargetUpdated = True，NotifyOnSourceUpdated = True} 保证金 = 5 / >
< 按钮 命令 = {Binding AddCommand，Up dateSourceTrigger = PropertyChanged，NotifyOnTargetUpdated = True，NotifyOnSourceUpdated = True，ValidatesOnDataErrors = True} 保证金 = 5 高度 = 35 / >
< / StackPanel >
< / ItemsControl >
< / Window >
UserControl
< UserControl
x：Class = HRSimplified.Controls.EmployeeGridControl
xmlns = http://schemas.microsoft .com / winfx / 2006 / xaml / presentation
xmlns：转换器 = clr-namespace：HRSimplified。转换器
xmlns：x = http：// schemas .microsoft.com / winfx / 2006 / xaml
xmlns：mc = http：// schemas。 openxmlformats.org/markup-compatibility/2006\"
xmlns：d = http://schemas.microsoft.com/expression/blend/2008
xmlns：local = clr-namespace：HRSimplified.View
xmlns：system = clr-namespace：System; assembly = mscorlib
xmlns：VM = clr-namespace：HRSimplified.ViewModel
mc：可忽略 = d
d：DesignHeight = 450
d：DesignWidth = 800 >
< 网格 >
< DataGrid x：名称 = MasterData MaxHeight = 1080 ItemsSource = {Binding MasterData，Mode = TwoWay，UpdateSourceTrigger = PropertyChanged，NotifyOnTargetUpdated = True，NotifyOnSourceUpdated = True} >
< DataGridTextColumn x：名称 = 名称 绑定 = {Binding Mode = TwoWay} / >
< / DataGrid >
< / Grid >
< / UserControl >
ViewModel_Employee
public class ViewModel_Employee：ViewModelBase
{
public HRSimplifiedEntities Model = new HRSimplifiedEntities（）;
private ObservableCollection< Model.Employee> _主要的数据;
public ObservableCollection< Model.Employee> MasterData
{
get
{
return _MasterData ;
}
set
{
SetProperty（ ref this ._ MasterData， value ）;
}
}
私人员工_emp;
private ICommand _submitCommand;
public 员工emp
{
get { return _emp; }
set
{
_emp = value ;
OnPropertyChanged（ EmployeeCollection）;
}
}
public ViewModel_Employee（）
{
MasterData = new ObservableCollection< Model.Employee>
（Model.Employees.ToList（） as IEnumerable< Employee>）;
}
public ICommand AddCommand
{
get
{
if （_submitCommand == null ）
{
_submitCommand = new RelayCommand（executeMethod，canExecuteMethod， false ）;
}
return _submitCommand;
}
}
私人 bool canExecuteMethod（ object 参数）
{
if （ string .IsNullOrEmpty（emp.Name）|| string .IsNullOrEmpty（emp.Gender）||
string .IsNullOrEmpty（emp.Salary.ToString（）））
return 假;
else
return true < /跨度>;
}
私有 void executeMethod（ object 参数）
{
MasterData.Add（emp）;
Model.Employees.Add（emp）;
Model.SaveChanges（）;
System.Media.SystemSounds.Beep.Play（）;
}
我的尝试：
我在两个视图上使用相同的视图模型。
但我认为它会在每个视图上创建视图模型和datacontext的新实例。
我想解决这个问题。
解决方案
每个视图都有自己的收藏。
View1 is更新只是因为它正在重新加载整个集合（来自view2的更新）。
View1需要对view2的集合的引用（它可以在其网格中使用）。
I am adding a record from view 2 in the database;
1. The record is inserted successfully and is instantly shown in the usercontrol(DataGrid) on the same view(View2)
2. The changes are not shown in view 1 Unless I Close the the view or application and start it again.
// The INotifyProperty is implemented in ViewModelBase Class
View1
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:UC="clr-namespace:HRSimplified.Controls"
x:Class="HRSimplified.MainWindow"
Title="MainWindow" Height="628" Width="986">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<UC:EmployeeGridControl Grid.Column="1" />
</Grid>
</Window>
View2
<Window
x:Class="HRSimplified.Windows.EmployeeDashboard"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Converters="clr-namespace:HRSimplified.Converters"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:HRSimplified.View"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:system="clr-namespace:System;assembly=mscorlib"
xmlns:VM="clr-namespace:HRSimplified.ViewModel"
xmlns:UC="clr-namespace:HRSimplified.Controls"
mc:Ignorable="d"
Title="EmployeeDashboard">
<Window.DataContext>
<VM:ViewModel_Employee />
</Window.DataContext>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="2*" />
</Grid.ColumnDefinitions>
<UC:EmployeeGridControl />
<ItemsControl ItemsSource="{Binding Path=emp}">
<StackPanel>
<TextBox EditValue="{Binding emp.Name, NotifyOnTargetUpdated=True, NotifyOnSourceUpdated=True}" Margin="5" />
<Button Command="{Binding AddCommand, UpdateSourceTrigger=PropertyChanged, NotifyOnTargetUpdated=True, NotifyOnSourceUpdated=True, ValidatesOnDataErrors=True}" Margin="5" Height="35" />
</StackPanel>
</ItemsControl>
</Window>
UserControl
<UserControl
x:Class="HRSimplified.Controls.EmployeeGridControl"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:Converters="clr-namespace:HRSimplified.Converters"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:HRSimplified.View"
xmlns:system="clr-namespace:System;assembly=mscorlib"
xmlns:VM="clr-namespace:HRSimplified.ViewModel"
mc:Ignorable="d"
d:DesignHeight="450"
d:DesignWidth="800">
<Grid>
<DataGrid x:Name="MasterData" MaxHeight="1080" ItemsSource="{Binding MasterData, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnTargetUpdated=True, NotifyOnSourceUpdated=True}">
<DataGridTextColumn x:Name="Name" Binding="{Binding Mode=TwoWay}" />
</DataGrid>
</Grid>
</UserControl>
ViewModel_Employee
public class ViewModel_Employee:ViewModelBase
{
public HRSimplifiedEntities Model = new HRSimplifiedEntities();
private ObservableCollection<Model.Employee> _MasterData;
public ObservableCollection<Model.Employee> MasterData
{
get
{
return _MasterData;
}
set
{
SetProperty(ref this._MasterData, value);
}
}
private Employee _emp;
private ICommand _submitCommand;
public Employee emp
{
get { return _emp; }
set
{
_emp = value;
OnPropertyChanged("EmployeeCollection");
}
}
public ViewModel_Employee()
{
MasterData = new ObservableCollection<Model.Employee>
(Model.Employees.ToList() as IEnumerable<Employee>);
}
public ICommand AddCommand
{
get
{
if (_submitCommand== null)
{
_submitCommand = new RelayCommand(executeMethod, canExecuteMethod, false);
}
return _submitCommand;
}
}
private bool canExecuteMethod(object parameter)
{
if (string.IsNullOrEmpty(emp.Name) || string.IsNullOrEmpty(emp.Gender) ||
string.IsNullOrEmpty(emp.Salary.ToString()))
return false;
else
return true;
}
private void executeMethod(object parameter)
{
MasterData.Add(emp);
Model.Employees.Add(emp);
Model.SaveChanges();
System.Media.SystemSounds.Beep.Play();
}
What I have tried:
I used the same view model on both views.
but I think it creates a new instance of the view model and datacontext on each view.
I want to resolve this issue.
解决方案
Each view is getting its own collection.
View1 is updating only because it's reloading the entire collection (with updates from view2).
View1 needs a reference to view2's collection (that it can use in its grid).
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