C# 获取 XmlNode 的值 object

Question

XmlNode objects are supposed to have a Value property, as explained here , but I'm having trouble accessing it. I have serialized an XML string into this class:

[System.SerializableAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public partial class requisitionsRequisition
{
    public object start_date { get; set; }
    public object end_date { get; set; }
    public object title { get; set; }
}

Here's where I do the work:

using (var reader = new StringReader(content))
{
    var deserializer = new XmlSerializer(typeof(requisitionsRequisition), new XmlRootAttribute("requisitionsRequisition"));

    var r = (requisitionsRequisition)deserializer.Deserialize(reader);

    return View("Index", r);
 }
 

Here's a screenshot of what I see in my debugger. I can't access value, it doesn't exist. My types are wrong somehow.

When I try to access the Title property, it tells me the type is {System.Xml.XmlNode[1]} but when I try to use the Value property, it tells me it doesn't exist.

Sorry, I know you guys on here hate screenshots:)

Answer 1

Try the following:

VS 2017 / VS 2019

Add Reference to System.Xml.Serialization

• In VS menu, click Project
• Select Add Reference
• Check System.Xml.Serialization
• Click OK

Add using statement : using System.Xml.Serialization;

Create class : requisitionsRequisition

• In VS menu, click Project
• Select Add Class (name: requisitionsRequisition)

Add using statement : using System.Xml.Serialization;

requisitionsRequisition.cs

[System.SerializableAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
public class requisitionsRequisition
{
    [XmlElementAttribute(ElementName = "start_date")]
    public object start_date { get; set; }

    [XmlElementAttribute(ElementName = "end_date")]
    public object end_date { get; set; }

    [XmlElementAttribute(ElementName = "title")]
    public object title { get; set; }
}

Create class : HelperXml

• In VS menu, click Project
• Select Add Class (name: HelperXml)

Add using statement : using System.Xml.Serialization;

HelperXml.cs

public static T DeserializeXMLFileToObject<T>(string xmlFilename)
{
    T rObject = default(T);

    try
    {

        if (string.IsNullOrEmpty(xmlFilename))
        {
            return default(T);
        }

        using (System.IO.StreamReader xmlStream = new System.IO.StreamReader(xmlFilename))
        {
            //create new instance
            System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(typeof(T));

            //deserialize - read XML file
            rObject = (T)serializer.Deserialize(xmlStream);
        }

    }//try
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine(ex.Message);
    }//catch

    return rObject;
}

public static void SerializeObjectToXMLFile(object obj, string xmlFilename)
{
    try
    {
        if (string.IsNullOrEmpty(xmlFilename))
        {
            return;
        }//if

        using (System.IO.TextWriter xmlStream = new System.IO.StreamWriter(xmlFilename))
        {
            //create new instance
            System.Xml.Serialization.XmlSerializer serializer = new System.Xml.Serialization.XmlSerializer(obj.GetType());

            //serialize - write XML file
            serializer.Serialize(xmlStream, obj);
        }
    }
    catch (Exception ex)
    {
        System.Diagnostics.Debug.WriteLine(ex.Message);
    }

}

Usage : (Serialize) - Write file

string filename = @"C:\Temp\XmlFile1.xml";

requisitionsRequisition r1 = new requisitionsRequisition();
r1.title = "This is my title";

//write to file
HelperXml.SerializeObjectToXMLFile(r1, filename);

Usage : (Deserialize) - Read file

string filename = @"C:\Temp\XmlFile1.xml";

//read from file
requisitionsRequisition r2 = HelperXml.DeserializeXMLFileToObject<requisitionsRequisition>(filename);

System.Diagnostics.Debug.WriteLine("title: " + r2.title.ToString());

Answer 2

As Alexei Levenkov pointed out in the comments. The type of the requisitionsRequisition properties was of a generic Object .

I couldn't access the Value property because the type was no longer XmlNode . I simply cast back to XmlNode and I can access the values easily now.

I changed this:

var title = r.requisitions[0].title

to this:

var title = (XmlNode[])r.requisition[0].title;