WPF MvvM DataGrid动态列 [英] WPF MvvM DataGrid Dynamic Columns
问题描述
我正在以MvvM的方式从ToolKit动态搜索如何创建DataGrid的列。但是看起来是不可能的!
I am searching about how to create the columns of the DataGrid from the ToolKit dynamic in MvvM way. But looks like it is impossible !
有没有一个人必须做这些事情?
Is there some one that had to do the samething ?
不需要创建一个来自DataGrid的用户控件或另一个控件,我只想将网格的ItemSource设置为我的自定义对象,并且在某种程度上,我想在运行时动态中定义网格的列,基于
there is no need to create a usercontrol or another control that comes from DataGrid, I just want to set de ItemSource of the grid to my custom object and in some point I want to define the columns of the grid in runtime dynamic based in the kind of the object.
可以吗?
欢呼
推荐答案
我要介绍一下,说这可能不是最好的解决方案,可能在某些情况下可能无法工作,但是可以试一下将为你想要的工作。我只是鞭打了它,所以它可能有一些错误。它仍然会涉及到一些代码,但它使您的模型不了解您的观点。
I'm going to preface this by saying it maybe isn't the best solution to be doing and may not work in some situations but you can give it a try and see if it will work for what you want. I just whipped this up so it may have some bugs in it. Its still going to involve some code, but it keeps your model from knowing about you view.
您需要做的是创建一个扩展属性,允许您绑定DataGrid上的Columns属性。这是一个我放在一起的例子。
What you need to do is create an extension property that will allow you to bind the Columns property on the DataGrid. Here is an example that I put together.
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Windows;
using System.Windows.Controls;
public static class DataGridExtension
{
public static ObservableCollection<DataGridColumn> GetColumns(DependencyObject obj)
{
return (ObservableCollection<DataGridColumn>)obj.GetValue(ColumnsProperty);
}
public static void SetColumns(DependencyObject obj, ObservableCollection<DataGridColumn> value)
{
obj.SetValue(ColumnsProperty, value);
}
public static readonly DependencyProperty ColumnsProperty =
DependencyProperty.RegisterAttached("Columns",
typeof(ObservableCollection<DataGridColumn>),
typeof(DataGridExtension),
new UIPropertyMetadata (new ObservableCollection<DataGridColumn>(),
OnDataGridColumnsPropertyChanged));
private static void OnDataGridColumnsPropertyChanged(
DependencyObject d,
DependencyPropertyChangedEventArgs e)
{
if (d.GetType() == typeof(DataGrid))
{
DataGrid myGrid = d as DataGrid;
ObservableCollection<DataGridColumn> Columns =
(ObservableCollection<DataGridColumn>)e.NewValue;
if(Columns != null)
{
myGrid.Columns.Clear();
if (Columns != null && Columns.Count > 0)
{
foreach (DataGridColumn dataGridColumn in Columns)
{
myGrid.Columns.Add(dataGridColumn);
}
}
Columns.CollectionChanged += delegate(object sender,
NotifyCollectionChangedEventArgs args)
{
if(args.NewItems != null)
{
foreach (DataGridColumn column
in args.NewItems.Cast<DataGridColumn>())
{
myGrid.Columns.Add(column);
}
}
if(args.OldItems != null)
{
foreach (DataGridColumn column
in args.OldItems.Cast<DataGridColumn>())
{
myGrid.Columns.Remove(column);
}
}
};
}
}
}
}
然后你将它附加到你这样的DataGrid(其中列是您的视图模型上的ObservableCollection属性)
Then you attach it to you DataGrid like this (Where columns is the an ObservableCollection property on your view model)
<Controls:DataGrid AutoGenerateColumns="False"
DataGridExtension.Columns="{Binding Columns}" />
如果您开始添加和删除列,我不知道它将如何回应,但是似乎从我的基本测试工作。祝你好运!
I'm not sure how well it is going to respond if you start adding and remove columns, but it seems to work from my basic testing. Good Luck!
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