获取组合框的选定值时出现问题。 我得到的错误是,我似乎无法修复它,已经尝试了绑定,选择值路径等的各种组合,希望有人可以指出我正确的方向,谢谢!
ConvertBack 无法转换值"ClientRatesWPF.Model.ChargeUnit" (键入"充电单元")。 BindingExpression:Path=SelectedChargeUnitListValueId; DataItem='ClientRatesViewModel' (HashCode=33434731);目标元素为 'ComboBox' (Name='cmbChargeUnit');目标属性为"选定值" (类型"对象")NotSupportedException:'System.NotSupportedException: Int32Converter 无法从 ClientRatesWPF.Model.ChargeUnit 转换。
<av:ComboBox x:Name="cmbChargeUnit" HorizontalAlignment="Left" Margin="548,15,0,0" Width="187" ItemsSource="{av:Binding ChargeUnits}" DisplayMemberPath="ChargeUnitDescription" SelectedValue="{Binding SelectedChargeUnitListValueId}" VerticalAlignment="Top" Background="{av:DynamicResource {x:Static av:SystemColors.ControlDarkDarkBrushKey}}" Height="20" IsSynchronizedWithCurrentItem="True"/>
虚拟机:
public ObservableCollection<ChargeUnit> ChargeUnits
{
get { return _chargeUnitsCollection; }
set { _chargeUnitsCollection = value; }
}
public IList<ChargeUnit> ChargeUnitDescription
{
get { return _chargeUnitDescription; }
set
{
_chargeUnitDescription = value;
OnPropertyChanged("ChargeUnitDescription");
}
}
public IList<ChargeUnit> ChargeUnitListValueId
{
get { return _chargeUnitListValueId; }
set
{
_chargeUnitListValueId = value;
OnPropertyChanged("ChargeUnitListValueId");
}
}
public int SelectedChargeUnitListValueId
{
get { return _SelectedChargeUnitListValueId; }
set
{
_SelectedChargeUnitListValueId = value;
OnPropertyChanged("SelectedChargeUnitListValueId");
}
}
我填充可观察集合的位置(从方法中提取的代码)
while (reader.Read())
{
_chargeUnitsCollection.Add(new ChargeUnit
{
ChargeUnitListValueId = (int)reader["ListValueId"],
ChargeUnitDescription = reader["ValueName"].ToString()
});
}
所以你有一个组合框填充了一个ChargeUnit
的列表,你正在尝试将SelectedValue
设置为一个int
,这将是你的问题。您需要更改为选定的ChargeUnit
public int SelectedChargeUnitListValueId
{
get { return _SelectedChargeUnitListValueId; }
set
{
_SelectedChargeUnitListValueId = value;
var unitsWhere = ChargeUnits.Where(x => x.id == _SelectedChargeUnitListValueId);
if (unitsWhere.Count() > 0)
{
SelectedChargeUnit = unitsWhere.First();
}
OnPropertyChanged("SelectedChargeUnitListValueId");
}
}
public ChargeUnit SelectedChargeUnit
{
get { return _SelectedChargeUnit; }
set
{
_SelectedChargeUnit = value;
OnPropertyChanged("SelectedChargeUnit");
}
}
并在您的绑定中:
SelectedValue="{Binding SelectedChargeUnit}"