C# 如何强制更新视图
我有一个应用程序,它包含两个C# 如何强制更新视图,c#,wpf,mvvm,view,observablecollection,C#,Wpf,Mvvm,View,Observablecollection,我有一个应用程序,它包含两个视图和一个视图模型。 第一个视图[AddView]用于创建对象,第二个视图[ShowView]用于显示对象。ViewModel[DummyData]由一个observedcollection和创建新对象所需的一切组成 我的问题是: 当我从AddView添加对象时,如何强制更新ShowView 这是Dummy的数据 #region Fake Database private static ObservableCollection<Student> f
视图
和一个视图模型
。
第一个视图[AddView]
用于创建对象,第二个视图[ShowView]
用于显示对象。ViewModel[DummyData]
由一个observedcollection
和创建新对象所需的一切组成
我的问题是:
当我从AddView
添加对象时,如何强制更新ShowView
这是Dummy的数据
#region Fake Database
private static ObservableCollection<Student> fakeStudentDataLayer;
public UserDummyData()
{
fakeStudentDataLayer = new ObservableCollection<Student>()
{
new Student(){Name = "test1", Surname = "surnameTest1", Age = 22, Barcode = "testbarcode1", ClassLetter = 'A', ClassNumber = 6, ID = 1, ParentName = "parentTest1", ParentSurname = "ParentSurnameTitle1", Number = 22, DateOfCreation = new DateTime(2008, 12, 2), LastCheckIn = new DateTime(2014, 3, 9)},
new Student(){Name = "test2", Surname = "surnameTest2", Age = 22, Barcode = "testbarcode2", ClassLetter = 'B', ClassNumber = 8, ID = 2, ParentName = "parentTest2", ParentSurname = "ParentSurnameTitle2", Number = 22, DateOfCreation = new DateTime(2008, 12, 2), LastCheckIn = new DateTime(2014, 3, 9)},
new Student(){Name = "test3", Surname = "surnameTest3", Age = 22, Barcode = "testbarcode3", ClassLetter = 'C', ClassNumber = 10, ID = 3, ParentName = "parentTest3", ParentSurname = "ParentSurnameTitle3", Number = 22, DateOfCreation = new DateTime(2008, 12, 2), LastCheckIn = new DateTime(2014, 3, 9) }
};
}
public ObservableCollection<Student> FakeStudentDataLayer
{
get { return fakeStudentDataLayer; }
set { fakeStudentDataLayer = value; RaisePropertyChanged("FakeStudentDataLayer"); }
}
#endregion
#region Commands
private RelayCommand _addStudentCommand;
public ICommand NewStudentCommand
{
get
{
return _addStudentCommand
?? (_addStudentCommand = new RelayCommand(() =>
{
//Create new student
Student student = new Student();
//Set new student's properties
//TODO: Add ID value
student.Name = Name;
student.Surname = Surname;
student.ParentName = ParentName;
student.ParentSurname = ParentSurname;
student.ClassLetter = Convert.ToChar(ClassLetter.ToUpper());
student.ClassNumber = NumberConvertor(ClassNumber);
student.Class = Appender(ClassLetter, ClassNumber);
student.Number = Int32.Parse(Number);
student.Age = AgeConvertor(Age);
student.Barcode = Barcode;
student.ID = 6;
student.LastCheckIn = DateTime.Now;
student.DateOfCreation = DateTime.Now;
//TODO: ADD student to DATABASE
FakeStudentDataLayer.Add(student);
}));
}
}
#endregion
#区域假数据库
私有静态ObservableCollection fakeStudentDataLayer;
公共用户dummydata()
{
fakeStudentDataLayer=新的ObservableCollection()
{
新学生(){Name=“test1”,姓氏=“姓氏test1”,年龄=22岁,条形码=“testbarcode1”,ClassLetter=“A”,ClassNumber=6,ID=1,ParentName=“parentTest1”,ParentName=“parentnamesttitle1”,Number=22,DateOfCreation=newdatetime(2008,12,2),LastCheckIn=newdatetime(2014,3,9)},
新学生(){Name=“test2”,姓氏=“姓氏test2”,年龄=22岁,条形码=“testbarcode2”,ClassLetter=“B”,ClassNumber=8,ID=2,ParentName=“parentTest2”,ParentName=“parentnamesttitle2”,Number=22,DateOfCreation=newdatetime(2008,12,2),LastCheckIn=newdatetime(2014,3,9)},
新学生(){Name=“test3”,姓氏=“姓氏test3”,年龄=22岁,条形码=“testbarcode3”,ClassLetter=“C”,ClassNumber=10,ID=3,ParentName=“parentTest3”,ParentName=“parentnamesttitle3”,Number=22,DateOfCreation=newdatetime(2008,12,2),LastCheckIn=newdatetime(2014,3,9)}
};
}
公共可见收集FakeStudentDataLayer
{
获取{return fakeStudentDataLayer;}
设置{fakeStudentDataLayer=value;RaisePropertyChanged(“fakeStudentDataLayer”);}
}
#端区
#区域命令
私有RelayCommand _addStudentCommand;
公共ICommand NewStudentCommand
{
得到
{
return\u addStudentCommand
??(_addStudentCommand=新的RelayCommand(()=>
{
//创造新的学生
学生=新生();
//设置新学生的属性
//TODO:添加ID值
student.Name=Name;
学生。姓氏=姓氏;
student.ParentName=ParentName;
student.parent姓氏=parent姓氏;
student.ClassLetter=Convert.ToChar(ClassLetter.ToUpper());
student.ClassNumber=NumberConvertor(ClassNumber);
student.Class=Appender(ClassLetter,ClassNumber);
student.Number=Int32.Parse(Number);
学生。年龄=年龄转换器(年龄);
学生。条形码=条形码;
student.ID=6;
student.LastCheckIn=DateTime.Now;
student.DateOfCreation=DateTime.Now;
//TODO:将学生添加到数据库
FakeStudentDataLayer.Add(学生);
}));
}
}
#端区
这是AddView
<Grid>
<!--DataContext-->
<Grid.DataContext>
<dc:UserDummyData/>
</Grid.DataContext>
<!--Student TextBoxes-->
<TextBlock x:Name="StudentNameWaterMark"
Grid.Column="2"
Text="{x:Static p:Resources.Name}"
Style="{StaticResource WaterMarkStyle}"
Visibility="{Binding
ElementName=StudentNameContentTextBox,
Path=Text.IsEmpty, Converter={StaticResource
WaterMarkRemover}}"/>
<TextBox x:Name="StudentNameContentTextBox"
Grid.Column="2"
Text="{Binding Name}"
Width="{Binding ElementName=StudentNameWaterMark,
Path=Width}"
Style="{StaticResource BasicTextBoxTextStyle}"
Background="Transparent">
</TextBox>
<TextBlock Name="StudentSurnameWaterMark"
Grid.Column="2" Grid.Row="1"
Text="{x:Static p:Resources.Surname}"
Style="{StaticResource WaterMarkStyle}"
Visibility="{Binding
ElementName=StudentSurnameContentTextBox,
Path=Text.IsEmpty, Converter={StaticResource
WaterMarkRemover}}"/>
<TextBox x:Name="StudentSurnameContentTextBox"
Grid.Column="2" Grid.Row="1"
Text="{Binding Surname}"
Width="{Binding ElementName=StudentSurnameWaterMark,
Path=Width}"
Style="{StaticResource BasicTextBoxTextStyle}"
Background="Transparent">
</TextBox>
<!--Parent TextBoxes-->
<TextBlock x:Name="ParentNameWaterMark"
Grid.Column="2" Grid.Row="2"
Text="{x:Static p:Resources.ParentName}"
Style="{StaticResource WaterMarkStyle}"
Visibility="{Binding
ElementName=ParentNameContentTextBox,
Path=Text.IsEmpty, Converter={StaticResource
WaterMarkRemover}}"/>
<TextBox x:Name="ParentNameContentTextBox"
Grid.Column="2" Grid.Row="2"
Text="{Binding ParentName}"
Width="{Binding ElementName=ParentNameWaterMark,
Path=Width}"
Style="{StaticResource BasicTextBoxTextStyle}"
Background="Transparent">
</TextBox>
<TextBlock x:Name="ParentSurnameWaterMark"
Grid.Column="2" Grid.Row="3"
Text="{x:Static p:Resources.ParentSurname}"
Style="{StaticResource WaterMarkStyle}"
Visibility="{Binding
ElementName=ParentSurnameContentTextBox,
Path=Text.IsEmpty, Converter={StaticResource
WaterMarkRemover}}"/>
<TextBox x:Name="ParentSurnameContentTextBox"
Grid.Column="2" Grid.Row="3"
Text="{Binding ParentSurname}"
Width="{Binding ElementName=ParentSurnameWaterMark,
Path=Width}"
Style="{StaticResource BasicTextBoxTextStyle}"
Background="Transparent">
</TextBox>
<!--Student Details TextBoxes-->
<TextBlock x:Name="AgeWaterMark"
Grid.Column="5"
Text="{x:Static p:Resources.Age}"
Style="{StaticResource WaterMarkStyle}"
Visibility="{Binding
ElementName=AgeContentTextBox,
Path=Text.IsEmpty, Converter={StaticResource
WaterMarkRemover}}"/>
<TextBox x:Name="AgeContentTextBox"
Grid.Column="5"
Text="{Binding Age}"
Width="{Binding ElementName=AgeWaterMark,
Path=Width}"
Style="{StaticResource BasicTextBoxTextStyle}"
Background="Transparent"/>
<Grid Grid.Column="5" Grid.Row="1">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock x:Name="GradeNumberWaterMark"
Text="{x:Static p:Resources.GradeNumber}"
Style="{StaticResource GradeWaterMarkStyle}"
Visibility="{Binding
ElementName=GradeNumberContentTextBox,
Path=Text.IsEmpty, Converter={StaticResource
WaterMarkRemover}}"/>
<TextBox x:Name="GradeNumberContentTextBox"
Width="{Binding ElementName=GradeNumberWaterMark,
Path=Width}"
Text="{Binding ClassNumber}"
Style="{StaticResource TextBoxTextStyle}"
Background="Transparent"/>
</Grid>
<Grid Grid.Column="5">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBlock x:Name="GradeLetterWaterMark"
Text="{x:Static p:Resources.GradeLetter}"
Style="{StaticResource GradeWaterMarkStyle}"
Visibility="{Binding
ElementName=GradeLetterContentTextBox,
Path=Text.IsEmpty, Converter={StaticResource
WaterMarkRemover}}"/>
<TextBox x:Name="GradeLetterContentTextBox"
Width="{Binding ElementName=GradeLetterWaterMark,
Path=Width}"
Text="{Binding ClassLetter}"
Style="{StaticResource TextBoxTextStyle}"
Background="Transparent"/>
</Grid>
</Grid>
<TextBlock x:Name="NumberWaterMark"
Grid.Column="5" Grid.Row="2"
Text="{x:Static p:Resources.NumberInClass}"
Style="{StaticResource WaterMarkStyle}"
Visibility="{Binding
ElementName=NumberContentTextBox,
Path=Text.IsEmpty, Converter={StaticResource
WaterMarkRemover}}"/>
<TextBox x:Name="NumberContentTextBox"
Grid.Column="5" Grid.Row="2"
Width="{Binding ElementName=NumberWaterMark,
Path=Width}"
Text="{Binding Number}"
Style="{StaticResource BasicTextBoxTextStyle}"
Background="Transparent"/>
<TextBlock x:Name="BarcodeWaterMark"
Grid.Column="5" Grid.Row="3"
Text="{x:Static p:Resources.Barcode}"
Style="{StaticResource WaterMarkStyle}"
Visibility="{Binding
ElementName=BarcodeContentTextBox,
Path=Text.IsEmpty, Converter={StaticResource
WaterMarkRemover}}"/>
<TextBox x:Name="BarcodeContentTextBox"
Grid.Column="5" Grid.Row="3"
Width="{Binding ElementName=BarcodeWaterMark,
Path=Width}"
Text="{Binding Barcode}"
Style="{StaticResource BarcodeTextBoxTextStyle}"
Background="Transparent"/>
<!--Buttons-->
<Grid Grid.Row="4" Grid.ColumnSpan="6">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<Button Grid.Row="1"
Content="{x:Static p:Resources.Add}"
HorizontalAlignment="Left"
Style="{StaticResource ButtonStyle}"
Command="{Binding NewStudentCommand}"/>
<Button Grid.Column="2"
Content="{x:Static p:Resources.Clear}"
HorizontalAlignment="Right"
Style="{StaticResource ButtonStyle}"/>
</Grid>
</Grid>
这是ShowView
<Grid>
<!--DataContext-->
<Grid.DataContext>
<dc:UserDummyData/>
</Grid.DataContext>
<!--DataGrid-->
<DataGrid AutoGenerateColumns="False"
CanUserAddRows="True"
CanUserDeleteRows="True"
ItemsSource="{Binding FakeStudentDataLayer}">
<DataGrid.Columns>
<DataGridTextColumn Header="{x:Static p:Resources.sName}"
Binding="{Binding Name}"/>
<DataGridTextColumn Header="{x:Static p:Resources.sSurname}"
Binding="{Binding Surname}"/>
<DataGridTextColumn Header="{x:Static p:Resources.sAge}"
Binding="{Binding Age}"/>
<DataGridTextColumn Header="{x:Static p:Resources.sGrade}"
Binding="{Binding Class}"/>
<DataGridTextColumn Header="{x:Static p:Resources.sNumber}"
Binding="{Binding Number}"/>
<DataGridTextColumn Header="{x:Static p:Resources.LastCheckIn}"
Binding="{Binding LastCheckIn}"/>
</DataGrid.Columns>
</DataGrid>
</Grid>
注意:如果我将ShowView中的代码放在AddView中,那么一切都正常,但是如果它们是这样的-一个两个独立的视图,DataGrid不会更新
编辑:我尝试使用相同的结构制作一个更简单的项目。令人难以置信的是,它起了作用,我并没有在这方面做出任何改变。新的sampler项目和这个项目的区别在于我使用了更基本的模型——只有两个属性。如果这很重要的话,我没有本地化。所以我的问题是,为什么它在一个较小的项目上工作,而不是在这个项目上 强制更新到底是什么意思?如果您的意思是添加数据,请尝试使用脚手架
我不确定您的代码到底是什么样子的,但我认为您有一个包含多个视图的窗口,您的窗口有一个MainViewModel,例如,其中的视图有自己的ViewModel。 如果MainViewModel创建并处理其他视图,那么它将获得这些视图的实例,并且能够在那里调用方法 所以,您的问题可能是想知道如何在viewmodels之间进行通信 这是我想到的一个小例子。 如果您有MainViewModel、DataAddViewModel和ShowViewModel。 MainViewModel创建DataAddViewModel和ShowViewModel。 DataAddViewModel有一个事件,该事件在插入新数据时触发。 ShowViewModel有一个到Listview或任何东西的绑定,以及一个触发该绑定的公共方法 注意:下面只是一个例子 数据添加视图模型中可能出现的事件 MainViewModel中可能的事件注册和处理 ShowViewModel中的公共方法
我最好的猜测是,问题来自于您使用了两个独立的
UserDummyData
实例。在“显示”视图和“添加”视图中,您可以如下设置DataContext
:
<Grid.DataContext>
<dc:UserDummyData/>
</Grid.DataContext>
<Grid ... DataContext="{x:Static p:Resources.MyUserDummyDataInstance}"/>
然后,当您将学生添加到一个UserDummyData
中时,两个视图都将显示新学生,因为他们的两个列表(其中
public void DataAdded(){
RaisePropertyChanged("NameOfMyBinding");
}
<Grid.DataContext>
<dc:UserDummyData/>
</Grid.DataContext>
<Grid ... DataContext="{x:Static p:Resources.MyUserDummyDataInstance}"/>