拖拽完成后，如何保存？

缺乏、安全感 2023-12-28 06:47 53阅读 0赞

将文件保存为XML格式即可。这里使用XElement对象来保存XML文件。

参考MSDN

[https://docs.microsoft.com/zh-cn/dotnet/csharp/programming-guide/concepts/linq/creating-xml-trees-linq-to-xml-2][https_docs.microsoft.com_zh-cn_dotnet_csharp_programming-guide_concepts_linq_creating-xml-trees-linq-to-xml-2]

1、创建根目录

XElement root = new XElement("Root");

2、添加子节点

XElement designerItemsXML = SerializeDesignerItems(designerItems);  
XElement connectionsXML = SerializeConnections(connections);

XElement root = new XElement("Root");  
root.Add(designerItemsXML);  
root.Add(connectionsXML);

3、保存

SaveFileDialog saveFile = new SaveFileDialog();  
saveFile.Filter = "Files (\*.xml)|\*.xml|All Files (\*.\*)|\*.\*";  
if (saveFile.ShowDialog() == true)  
\{  
root.Save(saveFile.FileName);

其中，最重要的是如何将自定义控件designerItems，connections转化为XElement对象，

对于designerItems,它是一个ContentControl控件，它的Content中存放着其他控件，所以对这个Content属性

要单独的做处理

let contentXaml = XamlWriter.Save(((DesignerItem)item).Content)；

部分代码如下

private XElement SerializeDesignerItems(IEnumerable<DesignerItem> designerItems)
            {
                XElement serializedItems = new XElement("DesignerItems",
                                           from item in designerItems
                                           let contentXaml = XamlWriter.Save(((DesignerItem)item).Content)
                                           select new XElement("DesignerItem",
                                                      new XElement("Left", Canvas.GetLeft(item)),
                                                      new XElement("Top", Canvas.GetTop(item)),
                                                      new XElement("Width", item.Width),
                                                      new XElement("Height", item.Height),
                                                      new XElement("ID", item.ID),
                                                      new XElement("zIndex", Canvas.GetZIndex(item)),
                                                      new XElement("IsGroup", item.IsGroup),
                                                      new XElement("ParentID", item.ParentID),
                                                      new XElement("Content", contentXaml)
                                                  )
                                       );
    
                return serializedItems;
            }

[https_docs.microsoft.com_zh-cn_dotnet_csharp_programming-guide_concepts_linq_creating-xml-trees-linq-to-xml-2]: https://docs.microsoft.com/zh-cn/dotnet/csharp/programming-guide/concepts/linq/creating-xml-trees-linq-to-xml-2