【发布时间】：2017-12-08 13:04:19
【问题描述】：
呼呼，
我阅读了很多帖子，但没有一个是真正有用的。所以我问自己。 希望有人可以帮助我，我不认为它是重复的。
我有一个列表，这些数据来自数据库。数据显示在 文本框 中，我希望能够更改数据。所以我写了一个INotifyPropertyChanged。但它没有按我的意愿工作。我总是看到旧值而不是新值。
WPF 代码：
<dxn:NavBarGroup Name="_navBarOverlay" Header="Benutzerübersicht">
<Grid Style="{StaticResource GridStyleAccordion}">
<DataGrid x:Name="userDataGrid" CanUserReorderColumns="True" CanUserResizeColumns="True" CanUserResizeRows="True" RowDetailsVisibilityMode="VisibleWhenSelected" IsReadOnly="True" AlternatingRowBackground="{DynamicResource WihaGrauB}" ColumnWidth="auto" ColumnHeaderHeight="30" AutoGenerateColumns="False" Grid.Row="0" Width="auto" Height="auto">
<DataGrid.Columns>
<DataGridTextColumn Header="OperatorID" Binding="{Binding OperatorID}" MinWidth="200" Width="3*"/>
<DataGridTextColumn Header="Benutzer" Binding="{Binding Name}" MinWidth="150" Width="2*" />
<DataGridCheckBoxColumn Header="Aktiv" Binding="{Binding Aktiv}" MinWidth="50" Width="*"/>
</DataGrid.Columns>
<DataGrid.RowDetailsTemplate>
<DataTemplate>
<DockPanel>
<Button x:Name="deleteButton" DockPanel.Dock="Left" Height="40" Width="30" Click="deleteButton_Click" Margin="10,0,0,0">
<StackPanel>
<Image Source="{Binding ImageUrl}" />
</StackPanel>
</Button>
<Grid Margin="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBlock Text="OperatorID: " FontFamily="{DynamicResource WihaFontFamaly}" Grid.Row="1" FontWeight="Bold" Margin="2,2,2,2"/>
<TextBox x:Name="operatorText" IsReadOnly="True" Text="{Binding OperatorID}" Width="150" HorizontalAlignment="Left" Grid.Row="1" Grid.Column="2" TextAlignment="Center" Margin="2,2,2,2" />
<TextBlock Text="Name: " FontFamily="{DynamicResource WihaFontFamaly}" FontWeight="Bold" Grid.Row="2" Margin="2,2,2,2"/>
<TextBox x:Name="nameText" Text="{Binding Path=Name, Mode=TwoWay}" Grid.Column="2" Width="150" MaxLength="128" TextAlignment="Center" HorizontalAlignment="Left" Grid.Row="2" Margin="2,2,2,2" />
<TextBlock Text="DeviceID: " FontFamily="{DynamicResource WihaFontFamaly}" FontWeight="Bold" Grid.Row="3" Margin="2,2,2,2"/>
<TextBox Text="{Binding DeviceID}" Grid.Column="3" Width="150" HorizontalAlignment="Left" MaxLength="255" TextCompositionManager.PreviewTextInput="passwordBoxNeu_PreviewTextInput" Grid.Row="3" TextAlignment="Center" Margin="2,2,2,2"/>
<TextBlock Text="Passwort: " FontFamily="{DynamicResource WihaFontFamaly}" FontWeight="Bold" Grid.Row="4" Margin="2,2,2,2" />
<TextBox Text="{Binding Passwort}" Grid.Column="4" Width="150" HorizontalAlignment="Left" Grid.Row="4" TextAlignment="Center" MaxLength="4" TextCompositionManager.PreviewTextInput="passwordBoxNeu_PreviewTextInput" Margin="2,2,2,2"/>
<TextBlock Text="Aktiv:" FontWeight="Bold" FontFamily="{DynamicResource WihaFontFamaly}" Grid.Row="5" Margin="2,2,2,2"/>
<CheckBox Grid.Column="5" Grid.Row="5" IsChecked="{Binding Aktiv}" Margin="2,2,2,2" />
<Button Style="{StaticResource ButtonStyleWIHA}" Click="saveUserPanel_Click" Name="saveUserPanel" Content="Save" Grid.Row="6" />
</Grid>
</DockPanel>
</DataTemplate>
</DataGrid.RowDetailsTemplate>
</DataGrid>
</Grid>
</dxn:NavBarGroup>
用户列表类：
public class User : INotifyPropertyChanged
{
private string _name = string.Empty;
public event PropertyChangedEventHandler PropertyChanged;
public string Name
{
get { return this._name; }
set
{
if (value != this._name)
{
this._name = value;
NotifyPropertyChanged("Name");
}
}
}
public string OperatorID { get; set; }
public bool Aktiv { get; set; }
public string ImageUrl { get; set; }
public string DeviceID { get; set; }
public string Passwort { get; set; }
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
我的事件处理器：
private void saveUserPanel_Click(object sender, RoutedEventArgs e)
{
var user = (sender as Button).DataContext as User;
if (user != null)
{
SqlConnection conn = new SqlConnection("Server=127.0.0.1;Database=Wiha;Trusted_Connection=true");
conn.Open();
SqlCommand cmd = new SqlCommand("dbo.wiha_operator_Update", conn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.Add(new SqlParameter("@OperatorID", user.OperatorID));
cmd.Parameters.Add(new SqlParameter("@DeviceID", user.DeviceID));
cmd.Parameters.Add(new SqlParameter("@Name", user.Name));
cmd.Parameters.Add(new SqlParameter("@Password", user.Passwort));
cmd.Parameters.Add(new SqlParameter("@Active", user.Aktiv));
using (SqlDataReader rdr = cmd.ExecuteReader())
{
while (rdr.Read())
{
if (rdr[0].Equals("S"))
{
popup = new ToolBox(string.Format("Operator '{0}' wurde bearbeitet.", user.OperatorID));
popup.Show();
//ShowAllOperator();
}
else
{
popup = new ToolBox(string.Format("Fehler beim bearbeiten des Operator '{0}'", user.OperatorID));
popup.Show();
}
}
}
}
}
public void ShowAllOperator()
{
try
{
List<User> users = new List<User>();
// string sql = "SELECT * FROM wiha_Operators";
SqlConnection conn = new SqlConnection("Server=127.0.0.1;Database=Wiha;Trusted_Connection=true");
conn.Open();
// SqlCommand cmd = new SqlCommand(sql, conn);
SqlCommand cmd = new SqlCommand("dbo.wiha_operators_SelectAll", conn);
cmd.CommandType = CommandType.StoredProcedure;
using (SqlDataReader rdr = cmd.ExecuteReader())
{
while (rdr.Read())
{
users.Add(new User() { Name = rdr.GetValue(2).ToString(), OperatorID = rdr.GetValue(0).ToString(), Aktiv = rdr.GetValue(4).Equals(true), ImageUrl = "C:/Users/Jason/Desktop/DeleteIcon.png", DeviceID = rdr.GetValue(1).ToString(), Passwort = rdr.GetValue(3).ToString() });
}
}
userDataGrid.ItemsSource = users;
}
catch (Exception)
{
throw;
}
}
希望有人可以帮助我：D
【问题讨论】：
-
你总是看到旧值是什么意思？您是指在添加新用户之后还是在更改文本框时？
-
同时更改文本框。当在 TextBox 中时，例如“TestUser”，我想将其更改为“TestUser2”。我总是看到“TestUser”。
-
请注意，默认情况下，绑定到 TextBox 的 Text 属性是 TwoWay。无需指定。
-
很高兴知道谢谢：D
标签： c# wpf list binding inotifypropertychanged