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WPF 获取模板列中的控件

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悬赏园豆:10 [已解决问题] 解决于 2016-12-02 14:04

一下是前端和后端的代码:

 <Grid>
        <DataGrid Name="FileDataGrid" AutoGenerateColumns="False"   Height="150" CanUserAddRows = "false">
            <DataGrid.Columns>
                <DataGridTemplateColumn Header="姓名"  Width="200*" IsReadOnly="True">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Name="labName" Text="{Binding Name}" Width="200" Height="25" VerticalAlignment="Center" TextAlignment="Left" />
                            </StackPanel>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="年龄"  Width="200*" IsReadOnly="True">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <StackPanel Orientation="Horizontal">
                                <TextBlock Name="labAge" Text="{Binding Age}" Width="200" Height="25" VerticalAlignment="Center" TextAlignment="Left" />
                            </StackPanel>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>

 public void MyWindow_25_Loaded(object sender, RoutedEventArgs e)
        {
            List<Person> person = new List<Person>()
            {
              new Person(){ Id="1",Name="Jack",Age="20"},
              new Person(){Id="2",Name="Alan",Age="23"}
            };
            this.FileDataGrid.ItemsSource = person;

            try
            {
                int index = FileDataGrid.CurrentCell.Column.DisplayIndex;
                DataGridTemplateColumn templeColumn = FileDataGrid.Columns[index] as DataGridTemplateColumn;
                if (templeColumn == null) return;
                object item = FileDataGrid.CurrentCell.Item;
                FrameworkElement element = templeColumn.GetCellContent(item);
                TextBlock expander = templeColumn.CellTemplate.FindName("labAge", element) as TextBlock;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

现在有这样的一个需求,当页面加载完了之后,在年龄这一列,当年龄小于20岁,将这一列的背景色设为蓝色,当年龄大于30岁,将这一列的背景色设为红色,上面的代码中,try模块中就是要获取年龄这个控件,但是:int index = FileDataGrid.CurrentCell.Column.DisplayIndex;走到这里就抛出了未将对象引用设置到对象的实例,请问各位大神,还有没有好的办法,来实现这一需求呢?

wpf
gyangjing的主页 gyangjing | 初学一级 | 园豆:11
提问于:2016-11-30 21:58
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最佳答案
0

你又没有focus cell,CurrentCell.Column当然是null,可以写一个类似下面的Converter:

[ValueConversion(typeof(int), typeof(Brush))]
    public class MyConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            int i = (int)(value);
            if (i <= 20)
                return Brushes.Blue;
            else if (i >= 30)
                return Brushes.Red;
            else
                return Brushes.White;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

 

收获园豆:10
jello chen | 大侠五级 |园豆:7091 | 2016-11-30 23:04

英雄所见略同,后来我也是用Converter来转换的,最开始想的就是在列表加载完了,然后就开始对列表里的某一个控件进行操作,最后发现不行,Converter是个不错的方法

gyangjing | 园豆:11 (初学一级) | 2016-12-02 13:59
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