Serialize a property using system.componentmodel.defaultvalueattribute

Question

0.00/5 (No votes)

See more:

Hello,

I try to serialize a n object to xml file.this object containt a property length

C#

[System.Xml.Serialization.XmlAttributeAttribute()]  
        [System.ComponentModel.DefaultValueAttribute(1D)]  
        public double Length  
        {  
            get  
            {  
                return this.lengthField;  
            }  
            set  
            {  
                this.lengthField = value;  
            }  
        }

When i give the value 1 to this property it does not displayed. Despite when i tried to affect the value 1.65 or 1.75 it appeared

How can fix this problem to display Length=1 ?

What I have tried:

XML

<Person Attribute1="Name" Attribute2="LastName" Attribute3="Age" Attribute4="Price">    
<Person1 Attribute1Person1="NamePerson" Attribute2Person1="LastNamePerson" />    
<Person2 Attribute1Person2="NamePerson" Attribute2Person2="LastNamePerson" />    
<Person3 Attribute1Person3="NamePerson" Attribute2Person3="LastNamePerson" />    
<Person4 Attribute1Person4="NamePerson" Attribute2Person4="LastNamePerson" />    
</Person>    
<Man Attribute1="Name" Attribute2="LastName" Attribute3="Age" Attribute4="Price" length="1.75">    
<Man1 Attribute1Person1="NameMan" Attribute2Person1="LastNameMan" length="1.65" />    
<Man2 Attribute1Person2="NameMan" Attribute2Person2="LastNameMan" />    
<Man3 Attribute1Person3="NameMan" Attribute2Person3="LastNameMan" length="1.55" />    
<Man4 Attribute1Person4="NameMan" Attribute2Person4="LastNameMan"  />    
</Man>    
<Women Attribute1="Name" Attribute2="LastName" Attribute3="Age" Attribute4="Price">    
<Women1 Attribute1Person1="NameWomen" Attribute2Person1="LastNameWomen" />    
<Women2 Attribute1Person2="NameWomen" Attribute2Person2="LastNameWomen" />    
<Women3 Attribute1Person3="NameWomen" Attribute2Person3="LastNameWomen" />    
<Women4 Attribute1Person4="NameWomen" Attribute2Person4="LastNameWomen" />    
</Women>

Posted 8-Nov-20 11:11am

.Net Perfect Dev

Updated 8-Nov-20 22:47pm

Add a Solution

Comments

[no name] 8-Nov-20 22:36pm

Try 1.0

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard Deeming · Answer 1 · 2020-11-08T22:49:00

Either remove the DefaultValue attribute, or override the default value when you serialize to XML:
XmlAttributes.XmlDefaultValue Property (System.Xml.Serialization) | Microsoft Docs[^]

C#

public XmlSerializer CreateSerializer()
{
    var attributeOverrides = new XmlAttributeOverrides();
    attributeOverrides.Add(typeof(Person), nameof(Person.Length), new XmlAttributes
    {
        XmlDefaultValue = double.NaN,
        XmlAttribute = new XmlAttributeAttribute(),
    });
    
    return new XmlSerializer(typeof(Person), attributeOverrides);
}

NB: When you override the serialization attributes for a property, you need to restate all serialization attributes, which is why you need to provide the XmlAttribute property as well as the XmlDefaultValue property.