silverlight中如何把UIElement等对象转换为xaml字符串

silverlight类库中没有提供，在网上找了找，貌似资料很少。现把我找到的一个并做了小量的修改，现拿出来分享一下：

总共分为两个类：XamlHelper和XamlWriter。

 

XamlHelper.cs

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Reflection;
using System.Text.RegularExpressions;

namespace SARuntimeXAMLWriter
{
    internal class XamlHelper
    {
        internal static bool hasCollections(DependencyObject obj)
        {
            PropertyInfo[] props = obj.GetType().GetProperties();
            foreach (var prop in props)
                if (prop.Name != "Parent" && (prop.PropertyType.BaseType.Name == "Collection`1" || prop.PropertyType.Name == "Transform"))
                    return true;
            return false;
        }
        internal static bool hasDeepCollections(DependencyObject obj, PropertyInfo prop)
        {
            if (obj == null || prop.PropertyType.IsArray)
                return false;
            return ((prop.GetValue(obj, null) ?? new object()).ToString().StartsWith("System."));
        }
        internal static string getSilverlightCompatibleXaml(string xaml)
        {
            Regex reg = new Regex(@"(\<(/)?\w+\.Children\>)", RegexOptions.None);
            return reg.Replace(xaml, "").Replace("xName", "x:Name");
        }
    }
}

 

XamlWriter.cs

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Reflection;
using System.Text;
using System.Xml;

namespace SARuntimeXAMLWriter
{
    public class XamlWriter
    {
        public static string Write(DependencyObject parent)
        {
            StringBuilder sb = new StringBuilder();
            XmlWriterSettings settings = new XmlWriterSettings();
            settings.OmitXmlDeclaration = true;
            settings.Indent = true;
            XmlWriter writer = XmlWriter.Create(sb, settings);
            //if (!TypeValidator.isValid(parent))
            //    throw new TypeValidationException();
            writer.WriteStartElement(parent.GetType().Name);
            writeCLRProperties(parent, writer);
            writeDPs(parent, writer);
            writeBrushes(parent, writer);
            writeCollections(parent, writer);
            writer.WriteEndElement();
            writer.Flush();
            writer.Close();
            return XamlHelper.getSilverlightCompatibleXaml(sb.ToString());
        }
        private static void writeCLRProperties(DependencyObject target, XmlWriter writer)
        {
            PropertyInfo[] props = target.GetType().GetProperties();
            bool hdc = false;
            foreach (var prop in props)
            {
                hdc = XamlHelper.hasDeepCollections(target, prop);
                if (prop.Name == "Name")
                {
                    if (prop.GetValue(target, null).ToString() != "")
                        writer.WriteAttributeString("x" + prop.Name, prop.GetValue(target, null).ToString());
                }
                else if (prop.Name != "Parent" && prop.CanRead && prop.CanWrite && prop.GetValue(target, null) != null
                    && prop.PropertyType.BaseType.Name != "Collection`1" && prop.PropertyType.Name != "Brush"
                    && !hdc)
                {
                    var propValue = prop.GetValue(target, null).ToString();
                    if (!propValue.Equals("Infinity") && !propValue.Equals("NaN"))
                        writer.WriteAttributeString(prop.Name, prop.GetValue(target, null).ToString());
                }
            }
        }
        private static void writeDPs(DependencyObject target, XmlWriter writer)
        {
            //DPs problem
            try
            {
                writer.WriteAttributeString("Canvas.Left", target.GetValue(Canvas.LeftProperty).ToString());
                writer.WriteAttributeString("Canvas.Top", target.GetValue(Canvas.TopProperty).ToString());
                writer.WriteAttributeString("Canvas.ZIndex", target.GetValue(Canvas.ZIndexProperty).ToString());
            }
            catch { }
            try
            {
                writer.WriteAttributeString("Storyboard.TargetName", target.GetValue(Storyboard.TargetNameProperty).ToString());
                writer.WriteAttributeString("Storyboard.TargetProperty", target.GetValue(Storyboard.TargetPropertyProperty).ToString());
            }
            catch { }

        }
        private static void writeBrushes(DependencyObject target, XmlWriter writer)
        {
            PropertyInfo[] props = target.GetType().GetProperties();
            object val;
            foreach (var prop in props)
                if (prop.PropertyType.Name == "Brush" && (val = prop.GetValue(target, null) ?? new object()).ToString() != "")
                {
                    if (val.ToString() == "System.Object")
                        continue;
                    writer.WriteStartElement(prop.ReflectedType.Name + "." + prop.Name);
                    writer.WriteStartElement(val.ToString().Split('.')[3]);
                    writeCLRProperties((DependencyObject)val, writer);
                    writeDeepCollections((DependencyObject)val, writer);
                    writeCollections((DependencyObject)val, writer);
                    writer.WriteEndElement();
                    writer.WriteEndElement();
                }
        }
        private static void writeCollections(DependencyObject target, XmlWriter writer)
        {
            if (target == null)
                return;
            PropertyInfo[] props = target.GetType().GetProperties();
            int cnt;
            object val;
            string collectionElement = "";
            foreach (var prop in props)
                if (prop.Name != "Parent" && prop.PropertyType.BaseType != null && prop.PropertyType.BaseType.Name == "Collection`1")
                {
                    cnt = (int)prop.PropertyType.InvokeMember("get_Count", BindingFlags.InvokeMethod, null, prop.GetValue(target, null), null);
                    for (int i = 0; i < cnt; i++)
                    {
                        val = prop.PropertyType.InvokeMember("get_Item", BindingFlags.InvokeMethod, null, prop.GetValue(target, null), new object[] { i });
                        if (XamlHelper.hasCollections((DependencyObject)val))
                        {
                            if (collectionElement != prop.ReflectedType.Name + "." + prop.Name)
                            {
                                if (collectionElement != "")
                                    writer.WriteEndElement();
                                collectionElement = prop.ReflectedType.Name + "." + prop.Name;
                                writer.WriteStartElement(collectionElement);
                            }
                            writer.WriteStartElement(val.GetType().Name);
                            writeCLRProperties((DependencyObject)val, writer);
                            writeDPs((DependencyObject)val, writer);
                            writeBrushes((DependencyObject)val, writer);
                            writeCollections((DependencyObject)val, writer);
                            writer.WriteEndElement();
                        }
                        else
                        {
                            writer.WriteStartElement(val.GetType().Name);
                            writeCLRProperties((DependencyObject)val, writer);
                            writeDPs((DependencyObject)val, writer);
                            writeBrushes((DependencyObject)val, writer);
                            writeDeepCollections((DependencyObject)val, writer);
                            writer.WriteEndElement();
                        }
                    }
                    if (collectionElement != "")
                    {
                        writer.WriteEndElement();
                        collectionElement = "";
                    }
                }
                //TransformGroup not inherits from Collection, so it can not be added
                //through writeCollections/writeDeepCollections and we should handle
                //it separately
                else if (prop.PropertyType.Name == "Transform")
                {
                    val = prop.GetValue(target, null);
                    if (val == null)
                        continue;
                    if (val.GetType().ToString() != "System.Windows.Media.TransformGroup" ||
                        ((int)val.GetType().GetProperty("Children").GetValue(val, null).GetType().GetProperty("Count").GetValue(val.GetType().GetProperty("Children").GetValue(val, null), null)) == 0)
                        continue;
                    writer.WriteStartElement(prop.ReflectedType.Name + "." + prop.Name);
                    writer.WriteStartElement(val.GetType().Name);
                    writeCollections(val as DependencyObject, writer);
                    writer.WriteEndElement();
                    writer.WriteEndElement();
                }
        }
        private static void writeDeepCollections(DependencyObject target, XmlWriter writer)
        {
            PropertyInfo[] props = target.GetType().GetProperties();
            object val;
            foreach (var prop in props)
                if (prop.PropertyType.BaseType.Name != "Collection`1" && prop.PropertyType.Name != "Transform" && XamlHelper.hasDeepCollections(target, prop))
                {
                    val = prop.GetValue(target, null);
                    if (val != null & val.GetType().Equals(typeof(DependencyObject)))
                    {
                        writer.WriteStartElement(prop.Name);
                        writeCollections((DependencyObject)val, writer);
                        writer.WriteEndElement();
                    }
                }
        }
    }
}

 

示例：

 

前台代码：

<Grid x:Name="LayoutRoot" Background="White">
        <Grid.RowDefinitions>
            <RowDefinition Height="200"></RowDefinition>
            <RowDefinition></RowDefinition>
        </Grid.RowDefinitions>
        <Canvas Height="100" Width="200" x:Name="myCanvas" Background="Beige">
            <TextBlock Text="Amyo Kabir"></TextBlock>
        </Canvas>
        <TextBox Grid.Row="1" x:Name="textBoxOutput"></TextBox>
    </Grid>

  

后台代码：

var root = XamlWriter.Write(myCanvas).Replace("x:", "");
            var elm = XElement.Parse(root);
            foreach (var child in myCanvas.Children)
            {
                elm.Add(XElement.Parse(XamlWriter.Write(child).Replace("x:", "")));
            }
            textBoxOutput.Text = elm.ToString();

 

 

textBoxOutput的内容为：

 

<Canvas Width="200" Height="100" MinWidth="0" MinHeight="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0,0,0,0" FlowDirection="LeftToRight" Name="myCanvas" AllowDrop="False" Opacity="1" RenderTransformOrigin="0,0" IsHitTestVisible="True" Visibility="Visible" UseLayoutRounding="True" Canvas.Left="0" Canvas.Top="0" Canvas.ZIndex="0">
  <Canvas.Background>
    <SolidColorBrush Color="#FFF5F5DC" Opacity="1" />
  </Canvas.Background>
  <TextBlock FontSize="11" FontFamily="Portable User Interface" FontWeight="Normal" FontStyle="Normal" FontStretch="Normal" TextWrapping="NoWrap" TextTrimming="None" TextAlignment="Left" Text="Amyo Kabir" Padding="0,0,0,0" LineHeight="0" LineStackingStrategy="MaxHeight" MinWidth="0" MinHeight="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="0,0,0,0" FlowDirection="LeftToRight" AllowDrop="False" Opacity="1" RenderTransformOrigin="0,0" IsHitTestVisible="True" Visibility="Visible" UseLayoutRounding="True" Canvas.Left="0" Canvas.Top="0" Canvas.ZIndex="0">
    <TextBlock.Foreground>
      <SolidColorBrush Color="#FF000000" Opacity="1" />
    </TextBlock.Foreground>
  </TextBlock>
</Canvas>