Deserializing XML into a C# Objects

Question

I have the following XML schema that I'm trying to deserialize into a C# objects:

<TMMAI>
     <StringReturn>123456789</StringReturn>
     <VectorReturn>
          <VectorElement>test1</VectorElement>
          <VectorElement>test2</VectorElement>
          <VectorElement>test3</VectorElement>
          <VectorElement>test4</VectorElement>
          <VectorElement>test5</VectorElement>
          <VectorElement>test6</VectorElement>
          <VectorElement>test7</VectorElement>
     </VectorReturn>
</TMMAI>

and the C# objects I want to deserialize into (generated from https://xmltocsharp.azurewebsites.net/, but pasting in the above XML schema):

    [XmlRoot(ElementName = "VectorReturn")]
    public class VectorReturn
    {
        [XmlElement(ElementName = "VectorElement")]
        public List<string> VectorElement { get; set; }
    }

    [XmlRoot(ElementName = "TMMAI")]
    public class TMMAI
    {
        [XmlElement(ElementName = "VectorReturn")]
        public VectorReturn VectorReturn { get; set; }
        [XmlElement(ElementName= "StringReturn")]
        public string StringReturn { get; set; }
    }

After initiating and using the default XmlDeserializer, VectorElement has a length of 0 with no data inside of it.

I also tried created my own object hierarchy that was the following, instead of using the generation tool:

    [XmlRoot("TMMAI")]
    public class TMMAI
    {
        [XmlElement("StringReturn")]
        public string StringReturn { get; set; }
        [XmlElement("VectorReturn")]
        public VectorReturn VectorReturn { get; set; }
    }

    public class VectorReturn
    {
        [XmlElement("VectorElement")]
        public List<VectorElement> VectorElements { get; set; }
    }

    public class VectorElement
    {
        public string Element { get; set; }
    }

This one got me closer - VectorElements was a size of 7, which was the correct number of <VectorElement> items in the test XML, but the value of each VectorElement.Element was null.

I'm close, but I can't tell what's wrong at this point. A wrong attribute? Incorrect object design? Need to use the XmlArray attribute?

[XmlArray("VectorElement")]

Seth Kitchen
– Seth Kitchen

2019-09-25 18:32:07 +00:00
Commented Sep 25, 2019 at 18:32 — Seth Kitchen
– Seth Kitchen, Commented Sep 25, 2019 at 18:32

vendettamit · Accepted Answer · 2019-09-25 19:18:55Z

1

Visual studio 2015 or greater have built-in XML to class converter. It might give you advantage over serialization/deserialization.Goto Edit -> Past special -> XML to Classes.

Below is the generated class using VS2019 -

// NOTE: Generated code may require at least .NET Framework 4.5 or .NET Core/Standard 2.0.
    /// <remarks/>
    [System.SerializableAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)]
    [System.Xml.Serialization.XmlRootAttribute(Namespace = "", IsNullable = false)]
    public partial class TMMAI
    {

        private uint stringReturnField;

        private string[] vectorReturnField;
        // Default constructor
        public TMMAI() {} 
        /// <remarks/>
        public uint StringReturn
        {
            get
            {
                return this.stringReturnField;
            }
            set
            {
                this.stringReturnField = value;
            }
        }

        /// <remarks/>
        [System.Xml.Serialization.XmlArrayItemAttribute("VectorElement", IsNullable = false)]
        public string[] VectorReturn
        {
            get
            {
                return this.vectorReturnField;
            }
            set
            {
                this.vectorReturnField = value;
            }
        }
    }

edited Sep 25, 2019 at 19:18

answered Sep 25, 2019 at 18:43

vendettamit

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4 Comments

iaacp Over a year ago

I tried this, but when I call deserializer.Deserialize<TMMAI>(response); to do the deserialization, I get an exception stating that System.MissingMethodException: 'No parameterless constructor defined for this object.'. I tried adding a parameterless constructor to the TMMAI class, but I'm still getting the same error. Any ideas?

vendettamit Over a year ago

Just add a default constructor in this class. Updated the code above.

iaacp Over a year ago

That's exactly what I had added too, but it's still giving the same error for some reason.

vendettamit Over a year ago

Remove Partial from the class declaration.

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