```html System.Xml.XmlDictionaryAttribute | Microsoft Docs
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System.Xml.XmlDictionaryAttribute

System.Xml.XmlDictionaryAttribute

Namespace: System.Xml

Assembly: System.Runtime.Serialization.dll

Overview
Syntax
Members
Examples

The XmlDictionaryAttribute class is used to specify how a property or field is serialized into a dictionary-based XML format. It can be applied to properties, fields, or parameters to control the dictionary key used during serialization.

Applies to: Property, Field, Parameter

public sealed class XmlDictionaryAttribute : Attribute
{
    public XmlDictionaryAttribute();
    public XmlDictionaryAttribute(string key);
    public string Key { get; set; }
}

Constructors

SignatureDescription
XmlDictionaryAttribute() Initializes a new instance with the default empty key.
XmlDictionaryAttribute(string key) Initializes a new instance with the specified dictionary key.

Properties

NameTypeDescription
Key string The dictionary key used for serialization. If empty, the member name is used. 
using System;
using System.Xml;
using System.Runtime.Serialization;

public class Person
{
    [XmlDictionary("FirstName")]
    public string Name { get; set; }

    [XmlDictionary("Age")]
    public int Age { get; set; }
}

var person = new Person { Name = "Alice", Age = 30 };
var writer = XmlDictionaryWriter.CreateBinaryWriter(Console.OpenStandardOutput());
var serializer = new DataContractSerializer(typeof(Person));
serializer.WriteObject(writer, person);
writer.Flush();

This example demonstrates how to assign custom dictionary keys to class members using the XmlDictionaryAttribute.

```