我可以在 ViewState 中存储 xmlDocument 对象吗？

发布于 2024-08-15 18:25:29 字数 773 浏览 11 评论 0原文

我有一个 XML 文档，我想将其存储在 ViewState 中，这样在每次回发时我不需要再次从其物理路径加载它。我也不想将它存储在 SessionState 中。

当我尝试在 ViewState 中插入它时，出现错误：

Exception Details: System.Runtime.Serialization.SerializationException: Type 'System.Xml.XmlDocument' in Assembly 'System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken =b77a5c561934e089' 未标记为可序列化。

我的属性是这样的：

private XmlDocument MyDocument      {
        get
        {
            object viwObj = ViewState["MyDocument"];
            if (viwObj != null)
                return (XmlDocument)viwObj;

            XmlDocument xmlDoc =  GetMyDocument();
            ViewState["MyDocument"] = xmlDoc;

            return xmlDoc;
        }
    }

How can I make an xml document 可序列化呢？

谢谢

原文

I have one XML document which I want to store it inside ViewState so on each post back I do not need to load it from its physical path again. I do not want to store it in SessionState as well.

when I tried to srote it in ViewState I get an error:

my property is something like this:

private XmlDocument MyDocument      {
        get
        {
            object viwObj = ViewState["MyDocument"];
            if (viwObj != null)
                return (XmlDocument)viwObj;

            XmlDocument xmlDoc =  GetMyDocument();
            ViewState["MyDocument"] = xmlDoc;

            return xmlDoc;
        }
    }

How can I make an xml document serializable then?

thanks

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北城挽邺 2024-08-22 18:25:29

您可以将 XmlDocument 序列化为 XML 字符串，并将该字符串保存在 ViewState 中。

序列化：

using (var sw = new StringWriter())
using (var xw = new XmlTextWriter(sw))
{
    xmlDoc.WriteTo(xw);
}

ViewState["MyDocument"] = sw.ToString()

反序列化：

var xmlDoc = new XmlDocument();
xmlDoc.LoadXml((string) ViewState["MyDocument"]);

这种序列化并不真正适合 get/set 属性，因此您很可能希望重写 SaveViewState() 和 LoadViewState() 方法，并在其中添加序列化/反序列化逻辑。

You could serialize your XmlDocument to an XML string and save that string in the ViewState.

Serialization:

using (var sw = new StringWriter())
using (var xw = new XmlTextWriter(sw))
{
    xmlDoc.WriteTo(xw);
}

ViewState["MyDocument"] = sw.ToString()

Deserialization:

var xmlDoc = new XmlDocument();
xmlDoc.LoadXml((string) ViewState["MyDocument"]);

This sort of serialization does not really fit into a get/set property, so you will most likely want to override the SaveViewState() and LoadViewState() methods of your user control/page, and add the serialization/deserialization logic within these.

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