如何在DataGrid中禁用的细胞，同时结合一个ObservableCollection [英] How to disable a cell in a DataGrid while binding to an ObservableCollection

问题描述

在我的节目，我有一个包含用户控件一个的DataGrid 有它的的ItemsSource 绑定到一个的ObservableCollection 。对于的DataGrid 我需要能够禁用和变灰特定细胞。我想在C ++中最好做到这一点，因为我可能需要改变这种情况在运行时的细胞。我知道如何使用 IsReadOnly ，但现在看来，我只能切换，对于整列。这将成为因为我的列被绑定到数据，这使得它很难对我来说，针对特定的网格单元有问题。

In my program I have a UserControl that contains a DataGrid that has it's ItemsSource bound to an ObservableCollection. For that DataGrid I need to be able to disable and gray out specific cells. I would like to do this preferably in c++, because I might need to change which cells this happens to at run time. I know how to use IsReadOnly, but it appears that I can only toggle that for an entire column. This becomes a problem because my columns are bound to data, which makes it harder for me to target specific grid cells.

有了这样说，

XAML：

<DataGrid ItemsSource="{Binding Model.Collection}" ... >
    <DataGrid.Columns>
          <!-- Row Number -->
          <DataGridTextColumn Width="SizeToCells" IsReadOnly="True" Binding="{Binding rowNum}" />
          <!-- Inputs -->
          <DataGridTextColumn Width="SizeToCells" IsReadOnly="False" Header="Inputs" Binding="{Binding input}" />
          <!-- Outputs -->
          <DataGridTextColumn Width="SizeToCells" IsReadOnly="False" Header="Outputs" Binding="{Binding output}" />
    </DataGrid.Columns>
</DataGrid>

数据模型：

Data Model:

namespace Program.Data_Models
{
    public class CartIO_Model : PropertyChangedBase
    {
        private string test1 = "One";
        private string test2 = "Two";
        private string test3 = "Three";
        private string DISABLEDtest4 = "Four";
        private string DISABLEDtest5 = "Five";

        private ObservableCollection<collectionData> _collection; 

        public CartIO_Model()
        {
            Collection = new ObservableCollection<collectionData>();
            Collection.Add(new collectionData() { rowNum = 0, input = test1, output = ""});
            Collection.Add(new collectionData() { rowNum = 1, input = test2, output = ""});
            Collection.Add(new collectionData() { rowNum = 2, input = "", output = test3 });
            Collection.Add(new collectionData() { rowNum = 3, input = "", output = DISABLEDtest4 });
            Collection.Add(new collectionData() { rowNum = 4, input = DISABLEDtest5, output = ""});

        }

        public ObservableCollection<collectionData> Collection
        {...}
    }

    public class collectionData
    {
        public int rowNum { set; get; }
        public string input { set; get; }
        public string output { set; get; }
    }
}

在哪里，我怎么会控制哪些细胞被激活/禁用？这混淆了我，因为 IsEnabled 是一个视图控件的一个特点，而不是一个的ObservableCollection 。

Where and how would I control which cells are enabled/disabled? This confuses me because IsEnabled is a trait of a View control, not that of an ObservableCollection.

推荐答案

您可以定义 CellStyle 为您列以及启用/禁用取决于任何数据的单元格在模型或视图模型。在这里，我已禁用在有输入值TEST4

You can define CellStyle for your Column and enable/disable the cells depending on any data in model or viewmodel. Here i have disabled all the cells in Inputs column which has input value as Test4

   <DataGrid ItemsSource="{Binding Model.Collection}"  >
        <DataGrid.Columns>
            <!-- Row Number -->
            <DataGridTextColumn Width="SizeToCells"  Binding="{Binding rowNum}">

            </DataGridTextColumn>
            <!-- Inputs -->
            <DataGridTextColumn Width="SizeToCells" Header="Inputs" Binding="{Binding input}" >
                <DataGridTextColumn.CellStyle>
                    <Style TargetType="DataGridCell">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding input}" Value="Four">
                                <Setter Property="IsEnabled" Value="false"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </DataGridTextColumn.CellStyle>
            </DataGridTextColumn>
            <!-- Outputs -->
            <DataGridTextColumn Width="SizeToCells" IsReadOnly="False" Header="Outputs" Binding="{Binding output}" />
        </DataGrid.Columns>
    </DataGrid>

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