C#序列化UIElementCollection
我有一些代码:C#序列化UIElementCollection,c#,xaml,serialization,deserialization,C#,Xaml,Serialization,Deserialization,我有一些代码: public static UIElementCollection DeSerializeXAML(string filename) { // Load XAML from file. Use 'using' so objects are disposed of properly. using (System.IO.FileStream fs = System.IO.File.Open(filename, System.IO.Fil
public static UIElementCollection DeSerializeXAML(string filename)
{
// Load XAML from file. Use 'using' so objects are disposed of properly.
using (System.IO.FileStream fs = System.IO.File.Open(filename, System.IO.FileMode.Open, System.IO.FileAccess.Read))
{
return System.Windows.Markup.XamlReader.Load(fs) as UIElementCollection; //EXCEPTION
}
}
// Serializes any UIElement object to XAML using a given filename.
public static void SerializeToXAML(UIElementCollection elements, string filename)
{
// Use XamlWriter object to serialize element
string strXAML = System.Windows.Markup.XamlWriter.Save(elements);
// Write XAML to file. Use 'using' so objects are disposed of properly.
using (System.IO.FileStream fs = System.IO.File.Create(filename))
{
using (System.IO.StreamWriter streamwriter = new System.IO.StreamWriter(fs))
{
streamwriter.Write(strXAML);
}
}
}
private void btnSave_Click(object sender, RoutedEventArgs e)
{
SaveFileDialog dlg = new SaveFileDialog();
dlg.FileName = "UIElement File"; // Default file name
dlg.DefaultExt = ".xaml"; // Default file extension
dlg.Filter = "Xaml File (.xaml)|*.xaml"; // Filter files by extension
// Show save file dialog box
Nullable<bool> result = dlg.ShowDialog();
// Process save file dialog box results
if (result == true)
{
// Save document
string filename = dlg.FileName;
SerializeToXAML(myCanvas.Children, filename);
}
}
private void btnLoad_Click(object sender, RoutedEventArgs e)
{
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.DefaultExt = ".xaml"; // Default file extension
dlg.Filter = "Xaml File (.xaml)|*.xaml"; // Filter files by extension
// Show open file dialog box
Nullable<bool> result = dlg.ShowDialog();
// Process open file dialog box results
if (result == true)
{
string filename = dlg.FileName;
UIElementCollection elements = DeSerializeXAML(filename) as UIElementCollection;
// Add all child elements (lines, rectangles etc) to canvas
myCanvas.Children.Clear();
foreach (UIElement el in elements)
{
myCanvas.Children.Add(el);
}
}
}
公共静态UIElementCollection反序列化XAML(字符串文件名)
{
//从文件加载XAML。请使用“using”,以便正确处理对象。
使用(System.IO.FileStream fs=System.IO.File.Open(filename,System.IO.FileMode.Open,System.IO.FileAccess.Read))
{
将System.Windows.Markup.XamlReader.Load(fs)作为UIElementCollection返回;//异常
}
}
//使用给定的文件名将任何UIElement对象序列化为XAML。
公共静态void serializedToxaml(UIElementCollection元素,字符串文件名)
{
//使用XamlWriter对象序列化元素
字符串strXAML=System.Windows.Markup.XamlWriter.Save(元素);
//将XAML写入文件。使用“using”以便正确处理对象。
使用(System.IO.FileStream fs=System.IO.File.Create(文件名))
{
使用(System.IO.StreamWriter StreamWriter=new System.IO.StreamWriter(fs))
{
streamwriter.Write(strXAML);
}
}
}
私有void btnSave_单击(对象发送方,路由目标)
{
SaveFileDialog dlg=新建SaveFileDialog();
dlg.FileName=“UIElement File”;//默认文件名
dlg.DefaultExt=“.xaml”//默认文件扩展名
dlg.Filter=“Xaml文件(.Xaml)|*.Xaml”//按扩展名筛选文件
//显示保存文件对话框
可为空的结果=dlg.ShowDialog();
//“处理保存文件”对话框结果
如果(结果==真)
{
//保存文档
字符串文件名=dlg.filename;
序列化Toxaml(myCanvas.Children,文件名);
}
}
私有无效btnLoad_单击(对象发送方,路由目标)
{
Microsoft.Win32.OpenFileDialog dlg=新的Microsoft.Win32.OpenFileDialog();
dlg.DefaultExt=“.xaml”//默认文件扩展名
dlg.Filter=“Xaml文件(.Xaml)|*.Xaml”//按扩展名筛选文件
//“显示打开的文件”对话框
可为空的结果=dlg.ShowDialog();
//“处理打开的文件”对话框结果
如果(结果==真)
{
字符串文件名=dlg.filename;
UIElementCollection元素=反序列化XAML(文件名)作为UIElementCollection;
//将所有子元素(线、矩形等)添加到画布
myCanvas.Children.Clear();
foreach(元素中的UIEL元素)
{
myCanvas.Children.Add(el);
}
}
}
这在序列化中可以正常工作,但在反序列化时会引发异常
异常文本(用google翻译):“您没有找到适合该类型的构造函数”System.Windows.Controls.UIElementCollection
“您可以使用参数或FactoryMethod指令生成此类型。”:行号“1”和位置在“22”行
UIElementCollection
不用于序列化。它意味着在构建WPF可视化树时使用。一个UIElementCollection
实例绑定到一个特定的visual
,因此,它不适合序列化(正如@kostya-k指出的)。反序列化逻辑不知道如何创建新的UIElementCollection
,因为它不知道与哪个Visual
关联。无论如何,创建一个新集合是毫无意义的,因为您只需将值传输到myCanvas.Children
好消息是,您可以使用XamlObjectWriter
直接填充myCanvas.Children
,而不是实例化新集合:
public static void DeSerializeXAML(UIElementCollection elements, string filename)
{
var context = System.Windows.Markup.XamlReader.GetWpfSchemaContext();
var settings = new System.Xaml.XamlObjectWriterSettings
{
RootObjectInstance = elements
};
using (var reader = new System.Xaml.XamlXmlReader(filename))
using (var writer = new System.Xaml.XamlObjectWriter(context, settings))
{
System.Xaml.XamlServices.Transform(reader, writer);
}
}
private void btnLoad_Click(object sender, RoutedEventArgs e)
{
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.DefaultExt = ".xaml"; // Default file extension
dlg.Filter = "Xaml File (.xaml)|*.xaml"; // Filter files by extension
// Show open file dialog box
Nullable<bool> result = dlg.ShowDialog();
// Process open file dialog box results
if (result == true)
{
string filename = dlg.FileName;
myCanvas.Children.Clear();
DeSerializeXAML(myCanvas.Children, filename);
}
}
publicstaticvoid反序列化XAML(UIElementCollection元素,字符串文件名)
{
var context=System.Windows.Markup.XamlReader.GetWpfSchemaContext();
var settings=new System.Xaml.XamlObjectWriterSettings
{
RootObjectInstance=元素
};
使用(var reader=new System.Xaml.XamlXmlReader(文件名))
使用(var writer=new System.Xaml.XamlObjectWriter(上下文,设置))
{
System.Xaml.XamlServices.Transform(读写器);
}
}
私有无效btnLoad_单击(对象发送方,路由目标)
{
Microsoft.Win32.OpenFileDialog dlg=新的Microsoft.Win32.OpenFileDialog();
dlg.DefaultExt=“.xaml”//默认文件扩展名
dlg.Filter=“Xaml文件(.Xaml)|*.Xaml”//按扩展名筛选文件
//“显示打开的文件”对话框
可为空的结果=dlg.ShowDialog();
//“处理打开的文件”对话框结果
如果(结果==真)
{
字符串文件名=dlg.filename;
myCanvas.Children.Clear();
反序列化XAML(myCanvas.Children,文件名);
}
}
但后者并不排除前者。也许他想出口WPF视觉树。