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>