我正试图通过我的代码传递一些问题。在我重新实现我的实体框架之后，我正在尝试从注册表单中保存详细信息。我正在使用LINQ查询，我的语法是这样的：
public void SaveTeacher(object param)
{
using (DatabaseStudentsEntitiesLastStand db = new DatabaseStudentsEntitiesLastStand())
{
Cours c = new Cours();//this is the Cours table in the db
c.education = education;//here I'm passing the value from the db to the value from VM.
RegisterTeacher t = new RegisterTeacher();//this is another table in db where most of the info from registration is stored
if (isChecked == true || c.courseName != null)
{
t.CourseName = c.courseName;//this is the courseName which belongs to courses,but I also have a column in RegisterTeacher for it
}
t.SNTeacher = SNTeacher;
t.UserName = _UserName;
t.pwd = pwd;
t.fullName = fullName;
db.RegisterTeachers.Attach(t);
db.Courses.Attach(c);
try
{
db.SaveChanges();
}
catch (DbEntityValidationException ex)
{
foreach (var entityValidationErrors in ex.EntityValidationErrors)
{
foreach (var validationError in entityValidationErrors.ValidationErrors)
{
MessageBox.Show("Property:" + validationError.PropertyName + "Error:" + validationError.ErrorMessage);
}
}
}//I'm trying to see the exceptions that I have in case something is not properly bonded(unfortunately no error)
这是与按钮的视图绑定：
<Button Content="Submit" Command="{Binding SaveCommand}"
HorizontalAlignment="Left" Margin="517,98.4,0,0" Grid.Row="2"
VerticalAlignment="Top" Width="110" Height="40"/>
最后，将方法传递给delegate命令：
public RegisterTeacherViewModel()
{
mergeCommand = new DelegateCommand(CreateCrazy);
saveCommand = new DelegateCommand(SaveTeacher);
IsChecked = true;
}
private DelegateCommand saveCommand;
public DelegateCommand SaveCommand
{
get { return saveCommand; }
set
{
if (saveCommand != value)
{
saveCommand = value;
NotifyOnPropertyChange("SaveCommand");
}
}
}
我不知道为什么不工作，但也许这里有人可以向我解释。我也尝试过简单的查询语法，没有任何运气。我根本不会做我所拥有的... 最后但并非最不重要的是，我在xaml.cs中建立了datacontext：
public partial class Register : Window
{
RegisterTeacherViewModel regTeacher;
Object obj = new object();
public Register()
{
InitializeComponent();
regTeacher = new RegisterTeacherViewModel();
this.DataContext = regTeacher;
cbxCourses.ItemsSource = regTeacher.GetByEducation();
//coursesList.ItemsSource = regTeacher.GetByEducation();
//regTeacher.CreateCrazy(ShowCourse);
}
其余的xaml如下：
<Window.DataContext>
<local:RegisterTeacherViewModel/>
</Window.DataContext>
<Grid Margin="20,20,3.6,28.4">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="2*"/>
<RowDefinition Height="2*"/>
</Grid.RowDefinitions>
<Label Content="Register"
Foreground="White"
FontSize="25"
HorizontalAlignment="Center"
Grid.ColumnSpan="2"
Margin="179,0,175.6,0.4"/>
<Separator>
</Separator>
<Label Content="SN:"
HorizontalAlignment="Left"
Margin="10,13.2,0,0"
Grid.Row="1"
VerticalAlignment="Top"/>
<Label Content="Username:
"
HorizontalAlignment="Left"
Margin="10,63.6,0,0"
Grid.Row="1"
VerticalAlignment="Top"
RenderTransformOrigin="-0.833,-0.208"/>
<Label Content="Password:"
HorizontalAlignment="Left"
Margin="10,111.6,0,0"
Grid.Row="1"
VerticalAlignment="Top"/>
<Label Content="Full
name:
"
HorizontalAlignment="Left"
Margin="10,158.2,0,0"
Grid.Row="1"
VerticalAlignment="Top"
RenderTransformOrigin="0.651,-0.415"/>
<Label Content="Courses teaching:
"
HorizontalAlignment="Left"
Margin="0,229.2,0,0"
Grid.Row="1"
VerticalAlignment="Top"
Grid.RowSpan="2"/>
<TextBox HorizontalAlignment="Left"
Name="SerialNr"
Height="23"
Margin="126,13.6,0,0"
Grid.Row="1"
TextWrapping="Wrap"
Text="{Binding SerialNT}"
VerticalAlignment="Top"
Width="248"
Grid.ColumnSpan="2"/>
<TextBox Grid.ColumnSpan="2"
Name="UsernameTeacher"
HorizontalAlignment="Left"
Height="23"
Margin="126,63.6,0,0"
Grid.Row="1"
TextWrapping="Wrap"
Text="{Binding UserName}"
VerticalAlignment="Top"
Width="248"/>
<PasswordBox Name="passwordBox"
mm:PasswordHelper.BindPassword="true"
mm:PasswordHelper.BoundPassword="{Binding Path=Pwd, Mode=TwoWay, ValidatesOnDataErrors=True,UpdateSourceTrigger=PropertyChanged}"
PasswordChar="*"
HorizontalAlignment="Left" Height="27"
Margin="126,111.2,0,0"
Grid.Row="1"
VerticalAlignment="Top"
Width="248"/>
<TextBox HorizontalAlignment="Left"
Name="fullName"
Height="23"
TextWrapping="Wrap"
Text="{Binding FullName}"
VerticalAlignment="Top"
Width="248" Grid.ColumnSpan="2"
Margin="126,158.6,0,0"
Grid.Row="1"
Grid.RowSpan="2"/>
<ComboBox HorizontalAlignment="Left"
DataContextChanged="cbxCourses_DataContextChanged"
Text="{Binding Education}"
x:Name="cbxCourses"
SelectedItem="{Binding Education}"
Margin="126,229.2,0,0"
IsSynchronizedWithCurrentItem="True"
Grid.Row="1"
VerticalAlignment="Top"
DisplayMemberPath="education"
Width="228"
Grid.RowSpan="2">
<!--<StackPanel Orientation="Horizontal">
<Image Source="https://www.frostburg.edu/fsu/assets/Image/dept/educ/education_sign_resized.jpg" Height="20"></Image>
<TextBlock Text="Program"></TextBlock>
</StackPanel>-->
</ComboBox>//
<button Content="Submit"
Command="{Binding SaveCommand}"
HorizontalAlignment="Left"
Margin="517,98.4,0,0"
Grid.Row="2"
VerticalAlignment="Top"
Width="110"
Height="40"/>
<Button Content="Cancel"
HorizontalAlignment="Left"
Margin="361,98.4,0,0"
Grid.Row="2"
VerticalAlignment="Top"
Width="111"
Height="40"/>
<ListBox HorizontalAlignment="Left"
Name="coursesList" Height="240"
Margin="418,13.2,0,0"
Grid.Row="1"
VerticalAlignment="Top"
Width="225"
Grid.RowSpan="2"
ItemsSource="{Binding Courses}">
<ListBox.ItemTemplate>//here I have a listbox where I have a checkbox with the name of the courses the user wishes to check
<DataTemplate>
<CheckBox x:Name="CheckBoxCourses"
Click="CheckBoxCourses_Click"
IsChecked="{Binding Path=IsChecked,UpdateSourceTrigger=PropertyChanged}"
Command="{Binding CheckCommand,Mode=TwoWay}"
Content="{Binding Path=courseName,Mode=TwoWay}"
Margin="0"/>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>
<Button Content="Show courses:"
Name="ShowCourse"
CommandParameter="{Binding ElementName=cbxCourses,Path=SelectedValue}"
Command="{Binding MergeCommand}"
HorizontalAlignment="Left"
Margin="163,61.4,0,0"
Grid.Row="2"
VerticalAlignment="Top"
Width="137"
Height="35"/>
</Grid>//this is a button that shows the courses in the listbox after the program was selected