DataGridComboBoxColumn不更新模型WPF [英] DataGridComboBoxColumn not updating model WPF

问题描述

我在WPF和DataGridComboBoxColumn中使用Datagrid。请找到以下代码：

 < DataGrid> ... 
 
< DataGridComboBoxColumn标题= CategoryWidth =200
 SelectedValueBinding ={Binding SelectedCategory，UpdateSourceTrigger = PropertyChanged}
 DisplayMemberPath =CategoryName
 SelectedValuePath =CategoryID> 
< DataGridComboBoxColumn.ElementStyle> 
< Style TargetType =ComboBox> 
< Setter Property =ItemsSourceValue ={Binding CategoriesList}>< / Setter> 
< / Style> 
< /DataGridComboBoxColumn.ElementStyle> 
< DataGridComboBoxColumn.EditingElementStyle> 
< Style TargetType =ComboBox> 
< Setter Property =ItemsSourceValue ={Binding CategoriesList}>< / Setter> 
< / Style> 
< /DataGridComboBoxColumn.EditingElementStyle> 
< / DataGridComboBoxColumn> 
  

模型如下：

  public CategoryModel SelectedCategory {get;组; } 
 public ObservableCollection< CategoryModel> CategoriesList 
 {
 get; 
设置; 
} 
  

现在，当我更改组合框中的选择时，它显示一个红色边框，无法

解决方案

这是错误的：

 < DataGridComboBoxColumn Header =CategoryWidth =200
 SelectedValueBinding ={Binding SelectedCategory，UpdateSourceTrigger = PropertyChanged}
 DisplayMemberPath =CategoryName> ; 
  

删除SelectedValuePath，或者获得一个类型匹配。我怀疑你需要UpdateSourceTrigger ...尝试ommit。

I'm using Datagrid in WPF and DataGridComboBoxColumn. Please find the code below:

<DataGrid>...                 

    <DataGridComboBoxColumn Header="Category" Width="200"                                        
                                    SelectedValueBinding="{Binding SelectedCategory, UpdateSourceTrigger=PropertyChanged}"
                                    DisplayMemberPath="CategoryName"
                                    SelectedValuePath="CategoryID">
        <DataGridComboBoxColumn.ElementStyle>
            <Style TargetType="ComboBox">
                <Setter Property="ItemsSource" Value="{Binding CategoriesList}"></Setter>
            </Style>
        </DataGridComboBoxColumn.ElementStyle>
        <DataGridComboBoxColumn.EditingElementStyle>
            <Style TargetType="ComboBox">
                <Setter Property="ItemsSource" Value="{Binding CategoriesList}"></Setter>
            </Style>                        
        </DataGridComboBoxColumn.EditingElementStyle>
   </DataGridComboBoxColumn>

The model is as follows:

public CategoryModel SelectedCategory { get; set; }
public ObservableCollection<CategoryModel> CategoriesList
{
    get;
    set;
}

Now when ever I change the selection in combobox it shows a red border, unable to commit the changes to the source.

解决方案

This is wrong:

<DataGridComboBoxColumn Header="Category" Width="200"                                        
                                SelectedValueBinding="{Binding SelectedCategory, UpdateSourceTrigger=PropertyChanged}"
                                DisplayMemberPath="CategoryName">

remove the SelectedValuePath or you get a type missmatch. I doubt you need the UpdateSourceTrigger either... Try to ommit.

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