将DataTable绑定到DataGrid. WPF MVVM [英] Binding DataTable to DataGrid. WPF MVVM

问题描述

我试图在Datagrid上绑定一个Datatable以便能够动态填充它. Datagrid似乎找到了Datatable，因为当我填充它并且在RaisePropertyChanged之后，我有很多空白行.也没有列.

I am trying to bind a Datatable on a Datagrid to be able to fill it dynamically. The Datagrid seems to find the Datatable because when I fill it and after the RaisePropertyChanged I have a lot of blank rows. There are no columns too.

我的视图:

<UserControl x:Class="NWViewer.View.DataGridView"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
         xmlns:local="clr-namespace:NWViewer.View"
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300"
         DataContext="{Binding DataGrid, Source={StaticResource Locator}}">
<Grid>
    <DataGrid ItemsSource="{Binding oTable.DefaultView}" AutoGenerateColumns="True" ColumnWidth="25">
    </DataGrid>
</Grid>
</UserControl>

我的ViewModel:

public DataTable oTable { get;set;}

private void getNewData(List<ElementBaseViewModel> rootElement)
{    
    oTable.Clear();
    foreach (var element in rootElement)
    {
        buildFromChildren(element);                      
    }
    RaisePropertyChanged("oTable");                
}        
private void buildFromChildren(ElementBaseViewModel element)
    {
        if(element.Children != null)
        {
            if (isAttributeChildren(element))
            {
                DataRow oRow = oTable.NewRow();
                foreach (var attribute in element.AttributeChildren)
                {
                    Model.Attribute attr = (Model.Attribute)attribute.Element;
                    if (!oTable.Columns.Contains(attr.name))
                    oTable.Columns.Add(attr.name);
                    oRow[attr.name] = attr.Value;
                }
                oTable.Rows.Add(oRow);
            }
            foreach (var elem in element.ElementChildren)
            {
                buildFromChildren(elem);
            }
        }
    }

这是图形渲染:

数据网格

但是当我调试它时，DataTable似乎正确填充了:

But the DataTable seems correctly filled when i debug it :

调试时的数据表

推荐答案

问题很可能与DataTable初始化有关，DataGrid将在设置新的ItemsSource时自动生成列，但它将初始化后将列添加到基础表中时，不会重新生成列.

The problem is most probably related to the DataTable initialization, DataGrid will auto-generate columns when a new ItemsSource is set, but it will not re-generate columns when columns are added to the underlying table after initialization.

解决方案1:

在将DataTable绑定到DataGrid之前，在初始化DataTable时创建所有列.

Create all columns on initialization of the DataTable, before binding it to the DataGrid.

解决方案2:

强制刷新ItemsSource.它应该像这样工作，但是如果可能的话，我强烈建议解决方案1:

Force refresh the ItemsSource. It should work like this, but I highly recommend Solution 1 if possible:

var tempTable = oTable;
oTable = null;
RaisePropertyChanged("oTable");
oTable = tempTable;
RaisePropertyChanged("oTable");

这篇关于将DataTable绑定到DataGrid. WPF MVVM的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！