更新：将布尔默认值设置为true

Question

I need to find a way to set the default value of ischecked to true, I am passing it as a parameter and I don't always set it.

ischecked is defined in my config files, I have multiple configs and in some it is defined and some it isn't. I won't get into why I use different configs. When it isn't define it is defaulted to false but I need it to be true.

function showSaveCardControl(ischecked) { 
    $(".saveCardControl").slideDown().find("input").prop("checked", ischecked); 
}

if it hasn't been defined I need the checkbox to be checked basically but since the default is false it is unchecked.

Update:

I am passing an xml element to ac# property. The xml would be where I set the value of ischecked but since I haven't set it somewhere either in the xml or once it has been turned into ac# property it is set to false. I am guessing it is set as the property tries to call that xml value.

I have tried setting the default using an attribute.

[XmlElement("EasyPaySaveCardControlChecked")]
[DefaultValue(true)]
public bool ischecked { get; set; }

I have tried setting it using a constructor.

public className()
{
    ischecked = true;
}

I have also tried making all the bools nullable and the value is still being set to false

none of these solutions work and I have no idea why. no matter what I do the property is set to false, if it was set to undefined it would be fine but bools have to defaulted to false

Answer 1

Try something like this:

function showSaveCardControl(ischecked) { 
    if ('undefined' === typeof ischecked) ischecked = true;
    $(".saveCardControl").slideDown().find("input").prop("checked", ischecked);
}

Answer 2

this should do the trick :

function showSaveCardControl(ischecked) { 
    if(typeof ischecked == 'undefined') 
       ischecked = true;

    $(".saveCardControl").slideDown().find("input").prop("checked", ischecked); 
}

Answer 3

Assuming the property is part of a class then just set it's default value to true in the class constructor and it will be overwritten down the line if you have logic to set the value from the config.

public class LukesClass
{
 public String whatever {get;set;}
 public bool isChecked {get;set;}

 public LukesClass()
 {
  isChecked = true;
 }
}

Answer 4

Try using auto property initializers (C# 6.0 and higher):

public bool isRequired { get; set; } = true;

I had a single case where I needed an unspecified xml bool to import as true instead of false. The above code will result in isRequired being true when either the tags specify true, or when they do not exist. It will only be false when tags define it as false.