我是DataContext的新手，我想将combobox设置为<Grid Name="groupEditArea" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Background="#FFD8D8D8" Margin="-14,0,192,0">
<Label Content="Group Name" FontSize="18" HorizontalAlignment="Left" Margin="116,50,0,0" VerticalAlignment="Top" Width="136"/>
<Label Content="Group Type" FontSize="18" HorizontalAlignment="Left" Margin="116,123,0,0" VerticalAlignment="Top" Width="136"/>
<TextBox x:Name="groupGroupNameTxt" HorizontalAlignment="Left" FontSize="16" Height="31" Margin="368,50,0,0" TextWrapping="Wrap" Text="{Binding Path = GroupName, Mode=TwoWay, StringFormat=\{0:n3\}, UpdateSourceTrigger=PropertyChanged}" VerticalAlignment="Top" Width="226" TextChanged="groupGroupNameTxt_TextChanged" /> <!-- GotFocus="GroupGroupNameTxt_OnGotFocus" TextInput="GroupGroupNameTxt_OnTextInput" -->
<ComboBox x:Name="groupGroupNameCombo" HorizontalAlignment="Left" Margin="368,123,0,0" VerticalAlignment="Top" Width="226" Height="31" SelectionChanged="groupGroupNameCombo_SelectionChanged" DisplayMemberPath="GroupName" SelectedValuePath="CategoriesVal" SelectedValue="{Binding Categories}"/>
</Grid>
我的xml位于下方
POCO我的 public class Test: INotifyPropertyChanged
{
public Test()
{
}
public virtual string TestId { get; set; }
public virtual Categories CategoriesVal { get; set; }
public virtual string Name{ get; set; }
public virtual string GroupName
{
get { return Name; }
set
{
Name = value;
OnPropertyChanged("GroupName");
}
}
}
public class Categories : INotifyPropertyChanged
{
public Categories ()
{
}
public virtual string CategorieId { get; set; }
public virtual string Name{ get; set; }
public virtual string GroupName
{
get { return Name; }
set
{
Name = value;
OnPropertyChanged("GroupName");
}
}
}
}
如下： -
backend并在我的DataContext代码中设置Categories cate = new Categories ();
cate.CategorieId = "cate1ID";
cate.GroupName = "CateGroupName1"
Test test = new Test();
test.TestId = "TestID";
test.CategoriesVal = cate;
test.Name = "TestName1";
，如下所示： -
groupGroupNameCombo和ItemsSource是使用Categories设置的，当我使用低于其正常工作时设置groupGroupNameCombo.SelectedItem = cate;
时包含整个列表
groupEditArea.DataContext = test;
但是当我使用下面的网格设置它不会工作： -
combobox有人可以指导我如何通过设置网格DataContext而不是手动设置combobox来设置//DB CONNECTION
$sql = "SELECT * FROM `slevy` WHERE 1 ";
$result = $conn->query($sql);
while ($row = $result->fetch_assoc()) {
$sleva = $row['sleva'];
echo $sleva;
}
echo "------------".$sleva;
。
答案 0 :(得分：1)
而不是
SelectedValuePath="CategoriesVal" SelectedValue="{Binding Categories}"
写
SelectedItem="{Binding CategoriesVal}"
SelectedValuePath表示：属性的名称（来自ComboBoxItem DataContex - Categories类（在我们的例子中），将提供SelectedValue的值。
如果您想要表示实例项（每个表单Combobox.Items）不是由项目本身完成，而是由一个特征完成，这非常有用。在你的情况下，我没有看到任何意义。
了解详情：Difference between SelectedItem, SelectedValue and SelectedValuePath