在Silverlight中将XML绑定到DataGrid [英] Dynamically Bind XML to DataGrid in Silverlight

问题描述

我一直试图在Silverlight（特别是Silverlight 4中）动态地将XML（通过XElement）绑定到DataGrid，但是在SL3中的任何解决方案也都会很好），但是一直没有这样做。我希望动态地做这个（即 - 没有严格的业务对象来表示XML）。

I've been trying to bind XML (via an XElement) to a DataGrid dynamically in Silverlight (specifically Silverlight 4, but any solutions in SL3 would be fine too) but have been unable to do so. I hope to do this dynamically (ie - no rigid business objects to represent the XML).

我最希望的是一种绑定到任何XElement包含任意XML，然后使用某种类型的IConverter将XElement转换为DataGrid可以绑定到的东西 - 只需知道如何从转换的对象自动生成列和行。

What I'm hoping for in the end is a way to bind to any XElement containing arbitrary XML, and then use some sort of IConverter to transform the XElement into something the DataGrid can bind to - and just "know" how to auto-generate columns and rows from the converted object.

<sdk:DataGrid 
    ItemsSource="{Binding Source={StaticResource MyViewModel}, 
    Path=MyXElement, Converter={SomeConverter}}" AutoGenerateColumns="True">

如果可能，我希望能够使用某种可重用的声明组件（尝试

If possible, I'd like to be able to utilize some sort of reusable declarative component (trying to avoid code-behind on actual Views).

我试过使用DynamicObjects，但DataGrid无法弄清楚其属性。

I've tried using DynamicObjects, but the DataGrid can't figure out its properties.

推荐答案

下面是另一种可能也有帮助的选择。这是一个黑客。

Below is another alternative that may also help. It's a bit of a hack.

ViewModel：

namespace DatagridXml
{
    public class TestViewModel
    {
        public TestViewModel()
        {
            XmlData = @"<people><person><name>Name1</name><age>21</age><address>Address1</address></person><person><name>Name2</name><age>22</age><address>Address2</address></person><person><name>Name3</name><age>23</age><address>Address3</address></person></people>";
        }
        public string XmlData { get; set; }
    }
}

价值转换器：

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Windows.Controls;
using System.Windows.Data;
using System.Xml.Linq;

namespace DatagridXml
{
    public class XmlColumnConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            string elementToGenerate = parameter.ToString();
            DataGrid control = value as DataGrid;
            control.Columns.Clear();

            var result = new List<IList<string>>();
            XDocument xmlDoc = XDocument.Parse(control.DataContext.ToString());

            // Generate Columns
            var columnNames = xmlDoc.Descendants(elementToGenerate).FirstOrDefault();
            int pos = 0;
            foreach (var columnName in columnNames.Elements())
            {
                var column = new DataGridTextColumn();
                column.Header = columnName.Name;
                column.Binding = new Binding("[" + pos + "]");
                control.Columns.Add(column);
                pos++;
            }

            // Parse elements to generate column's data
            foreach (var element in xmlDoc.Descendants(elementToGenerate))
            {
                var row = new List<string>();
                foreach (var column in element.Elements())
                {
                    row.Add(column.Value);
                }
                result.Add(row);
            }
            return result;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotSupportedException("Cannot convert to xml from list.");
        }
    }
}

而且，你使用如下：

<UserControl
    x:Class="DatagridXml.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
    xmlns:local="clr-namespace:DatagridXml"
    mc:Ignorable="d"
    d:DesignWidth="640"
    d:DesignHeight="480">
    <UserControl.Resources>
        <local:XmlColumnConverter
            x:Key="XmlColumnConverter" />
        <local:TestViewModel
            x:Key="TestViewModel" />
    </UserControl.Resources>
    <Grid
        x:Name="LayoutRoot">
        <data:DataGrid
            AutoGenerateColumns="False"
            DataContext="{Binding Source={StaticResource TestViewModel}, Path=XmlData}"
            ItemsSource="{Binding RelativeSource={RelativeSource Self}, Converter={StaticResource XmlColumnConverter}, ConverterParameter=person}" />
    </Grid>
</UserControl>

这篇关于在Silverlight中将XML绑定到DataGrid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！