I have this POCO class with properties that use a custom attribute:
Application status flags POCO class
public class ApplicationStatusFlags
{
public int ApplicationId { get; set; }
[SectionFlag("APPLICANTPERSONALDETAILS")]
public bool PersonalDetailsStatus { get; set; }
[SectionFlag("APPLICANTECREGISTRATION")]
public bool EcRegistrationStatus { get; set; }
[SectionFlag("APPLICANTCV")]
public bool CvUpload { get; set; }
[SectionFlag("APPLICANTSTATEMENT")]
public bool IceAttributeStatement { get; set; }
[SectionFlag("APPLICANTCPD")]
public bool CpdUpload { get; set; }
[SectionFlag("APPLICANTORGCHART")]
public bool OrgChartUpload { get; set; }
[SectionFlag("APPLICANTSPONSORDETAILS")]
public bool SponsorDetails { get; set; }
}
Section flag attribute class
[AttributeUsage(AttributeTargets.All)]
public class SectionFlagAttribute : Attribute
{
/// <summary>
/// This constructor takes name of attribute
/// </summary>
/// <param name="name"></param>
public SectionFlagAttribute(string name)
{
Name = name;
}
public virtual string Name { get; }
}
I'm trying to get the value of one of these properties by using a string with the section flag name.
So if var foo = "APPLICANTSPONSORDETAILS"
I would get the boolean value of SponsorDetails
.
Sample code
updateAppStatusFlag.ApplicationId = applicationId;
var applicationStatuses =
await _applicationService
.UpdateApplicationStatusFlagsAsync<ApplicationStatusFlags>(updateAppStatusFlag);
var foo = "APPLICANTSPONSORDETAILS";
var type = applicationStatuses.GetType();
var test = type.
GetCustomAttributes(false)
.OfType<SectionFlagAttribute>()
.SingleOrDefault()
?.Name == foo;
Any ideas how to do this? I know I can use reflection but I've had problems getting it to work.
Thanks
In you example, you're getting the customattributes of the class instead of the properties.
Here is an example:
private object GetValueBySectionFlag(object obj, string flagName)
{
// get the type:
var objType = obj.GetType();
// iterate the properties
var prop = (from property in objType.GetProperties()
// iterate it's attributes
from attrib in property.GetCustomAttributes(typeof(SectionFlagAttribute), false).Cast<SectionFlagAttribute>()
// filter on the name
where attrib.Name == flagName
// select the propertyInfo
select property).FirstOrDefault();
// use the propertyinfo to get the instance->property value
return prop?.GetValue(obj);
}
Note: this will return only the first property which contains the SectionFlagAttribute with the right name. You could modify the method to return multiple values. (like a collection of propertyname/value)
Usage:
// a test instance.
var obj = new ApplicationStatusFlags { IceAttributeStatement = true };
// get the value by SectionFlag name
var iceAttributeStatement = GetValueBySectionFlag(obj, "APPLICANTSTATEMENT");
If the returned value is null
then the flag is not found or the property's value is null.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.