Using C# Reflection, how to get Object's properties and their values if that Object is a property of Object that is inside of the List

Question

I need to grab the value of a property of an ObjectB, which is a Property of ObjectA and ObjectA is inside of a List<ObjectA>

I browsed through some examplse, but could not find exactly what I need.

Here is what I'm looking for:

I have a class MyScreenClass , that has a List<TicketReportPropertyEntity> :

public class MyScreenClass
{
     public List<TicketReportPropertyEntity> TicketReportPropertyEntities{ get; set; } 
}

This is TicketReportPropertyEntity class that has another class which property I need to work with:

public class TicketReportPropertyEntity
{
    public decimal Amount{get;set;}
    public ReportPropertyEntity ReportProperty {get;set;}
} 

This is ReportPropertyEntity class:

public class ReportPropertyEntity
{
    public string PropertyName { get; set; }
}

What I need to do, is for each TicketReportPropertyEntity to get Amount from TicketReportPropertyEntity and PropertyName from ReportPropertyEntity .

The purpose is I need to compare the PropertyName with a given property and set the value to an Amount

So far, I only came up with the following:

foreach (var ticketReportEntity in mol.TicketReportPropertyEntities)
{
   PropertyInfo propertyInfo1 = ticketReportEntity.GetType().GetProperty("ReportProperty");
           //here I need to do all the logic
}

What is the solution?

Answer 1

If you have to work with this two properties, and you have to store it in order to work with it, you could use:

List<TicketReportPropertyEntity> list = mol.TicketReportPropertyEntities;
List<keyValuePair<string, decimal>> values = 
   list.ToDictionary(element => element.ReportProperty.PropertyName, element => element.Amout).ToList();

Then, you will have a relationship between Amout and PropertyName properties.

Answer 2

To do this you would have to get the child PropertyInfo of ReportPropertyEntity.PropertyName also. Then, proceed to check it against your target and set to amount to what you need.

MyScreenClass mol = new MyScreenClass{ TicketReportPropertyEntities = new List<TicketReportPropertyEntity>()};
mol.TicketReportPropertyEntities.Add(new TicketReportPropertyEntity
{
    ReportProperty = new ReportPropertyEntity
    {
        PropertyName = "CoolPropertyName"
    }
});

string propertyToSearchFor = "CoolPropertyName";

foreach (var ticketReportEntity in mol.TicketReportPropertyEntities)
{
    var type = ticketReportEntity.GetType();

    //Get PropertyInfo objects
    PropertyInfo reportProperty = type.GetProperty("ReportProperty");
    PropertyInfo reportPropertyName = typeof(ReportPropertyEntity).GetProperty("PropertyName");
    PropertyInfo amountProperty = type.GetProperty("Amount");

    //Get needed values
    ReportPropertyEntity reportPropertyValue = (ReportPropertyEntity)reportProperty.GetValue(ticketReportEntity);
    string reportPropertyNameValue = (string)reportPropertyName.GetValue(reportPropertyValue);

    //Check if change is required
    if (reportPropertyNameValue == propertyToSearchFor)
    {
        amountProperty.SetValue(ticketReportEntity, 123.45M);
    }


}

Answer 3

// get PropertyName from ReportPropertyEntity, and find it on TicketReportPropertyEntity
var myScreen = new MyScreenClass()
{
    TicketReportPropertyEntities = new List<UserQuery.TicketReportPropertyEntity>
    {
        new TicketReportPropertyEntity{
            Amount=1.0m,
            ReportProperty = new ReportPropertyEntity{PropertyName="Name"}
        }
    }

};
var reportPropertyAccessor = typeof(TicketReportPropertyEntity).GetProperty(nameof(TicketReportPropertyEntity.ReportProperty));
var propertyNameAccessor = typeof(ReportPropertyEntity).GetProperty(nameof(ReportPropertyEntity.PropertyName));
var amountAccessor = typeof(TicketReportPropertyEntity).GetProperty(nameof(TicketReportPropertyEntity.Amount));
typeof(TicketReportPropertyEntity).GetProperties().Dump();

foreach(object ticketReportEntity in myScreen.TicketReportPropertyEntities){
    var ticketReportPropertyEntity=reportPropertyAccessor.GetValue(ticketReportEntity);
    var pn = propertyNameAccessor.GetValue(ticketReportPropertyEntity);
    if("Name" == (string)pn){
        ticketReportPropertyEntity.Dump();
        amountAccessor.SetValue(ticketReportEntity,2.0m);
    }
}