Develop Reference

How to properly access object's List<> value in C#?

I am trying to get the object value but I don't know how to do it. I'm new to C# and its giving me syntax error. I want to print it separately via the method "PrintSample" How can I just concatenate or append the whatData variable . Thank you.
PrintSample(getData, "name");
PrintSample(getData, "phone");
PrintSample(getData, "address");
//Reading the CSV file and put it in the object
string[] lines = File.ReadAllLines("sampleData.csv");
var list = new List<Sample>();
foreach (var line in lines)
{
var values = line.Split(',');
var sampleData = new Sample()
{
name = values[0],
phone = values[1],
address = values[2]
};
list.Add(sampleData);
}
public class Sample
{
public string name { get; set; }
public string phone { get; set; }
public string adress { get; set; }
}
//Method to call to print the Data
private static void PrintSample(Sample getData, string whatData)
{
//THis is where I'm having error, how can I just append the whatData to the x.?
Console.WriteLine( $"{getData. + whatData}");
}

In C# it's not possible to dynamically evaluate expression like
$"{getData. + whatData}"
As opposed to languages like JavaScript.
I'd suggest to use rather switch expression or Dictionary<string, string>
public void PrintData(Sample sample, string whatData)
{
var data = whatData switch
{
"name" => sample.name,
"phone" => sample.phone,
"address" => sample.address
_ => throw new ArgumentOutOfRangeException(nameof(whatData)),
};
Console.WriteLine(data);
}

I'm not sure what you are trying to achieve. Perhaps this will help you:
private static void PrintSample(Sample getData, string whatData)
{
var property = getData.GetType().GetProperty(whatData);
string value = (string)property?.GetValue(getData) ?? "";
Console.WriteLine($"{value}");
}

What PO really needs is
private static void PrintSamples(List<Sample> samples)
{
foreach (var sample in samples)
Console.WriteLine($"name : {sample.name} phone: {sample.phone} address: {sample.address} ");
}
and code
var list = new List<Sample>();
foreach (var line in lines)
{
......
}
PrintSamples(list);
it is radicolous to use
PrintSample(getData, "name");
instead of just
PrintSample(getData.name)

You can do this using reflection. However, it's known to be relatively slow.
public static void PrintSample(object getData, string whatData)
{
Console.WriteLine( $"{getData.GetType().GetProperty(whatData).GetValue(getData, null)}");
}

Interaction VS and other program

I've written a DLL that parses XML and returns Dictionary with tag name and its value. I'm using it in other program called ZennoPoster Project Maker. Here's the code:
XMLWork.XMLWorker worker = new XMLWork.XMLWorker(); // My parse class
string path = #"Z:\New\test.xml";
Dictionary<string, string> data = worker.GetData(path); // GetData - method, that returns
// data from XML
project.Variables["second_name"].Value = data["second_name"];
This block of code I must remake into XMLWorker class method and return a project type and in ZennoPoster I have to with 1 line of code return data. How can I do it?

Assuming that you have the following simplified types:
namespace Objects
{
public class Project
{
public Dictionary<string, Variable> Variables { get; set; }
}
public class Variable
{
public object Value { get; set; }
}
}
You could structure your XMLWorker class like this:
using Objects;
public class XMLWorker
{
public Project Project { get; private set; }
public XMLWorker(string path)
{
Project = new Project();
Dictionary<string, string> data = GetData(path);
Project.Variables["second_name"].Value = data["second_name"];
}
internal Dictionary<string, string> GetData(string path)
{
// method implementation
}
}
Sample usage:
var project = (new XMLWork.XMLWorker(#"Z:\New\test.xml")).Project;

how to read a CSV file to a List<myClass>?

is it possible to create a List of my own class from a CSV file?
the file e.g. looks like:
ID;NAME
1;Foo
2;Bar
then I have a class like:
class MyClass
{
public int id { get; set; }
public string name { get; set; }
}
is it possible to generate a list of this class out of the cvs file? maybe with some library

You could use a CSV parser such as FileHelpers or FastCSV. If you don't want to use third party libraries you may take a look at the built-in TextFieldParser class which could be used like that:
public IEnumerable<MyClass> Parse(string path)
{
using (TextFieldParser parser = new TextFieldParser(path))
{
parser.CommentTokens = new string[] { "#" };
parser.SetDelimiters(new string[] { ";" });
parser.HasFieldsEnclosedInQuotes = true;
// Skip over header line.
parser.ReadLine();
while (!parser.EndOfData)
{
string[] fields = parser.ReadFields();
yield return new MyClass()
{
id = fields[0],
name = fields[1]
};
}
}
}
and then:
List<MyClass> list = Parse("data.csv").ToList();
But never, please never roll your own CSV parser as other people suggested you here as answers to your question.

XNA - How to load the entire content of a .ini file

I managed to write to and read a specific parameter from a .ini file.
I was wondering if there was a way to load the entire content of the .ini file and store it in a special class. That way, I only have to load the .ini file once. This way it should reduce the amount of loading that the game will do.
I know that in small games, it propably doesn't matter, but I would still appreciate it if someone could point me in the right direction.

I believe that the creators of C# tend to push people in the direction of XML based config files rather then INI files - so there isn't anything built in. I found this article on CodeProject that wraps things in a nice class. Will this be of any help?
http://www.codeproject.com/Articles/1966/An-INI-file-handling-class-using-C
I didn't write it - and am not taking credit for it, but it may be what you are looking for :)

Assuming the INI is a simple key / value pair split with new line could you use something like this to provide the entire INI file as either a dictionary or a strongly typed object.
the method allows you to load an ini file into an object like this.
class IniStructure
{
public short Field1;
public int Property1 { get; set; }
public string Property2 { get; set; }
}
IniStructure ini = IniLoader.Load<IniStructure>(<fileName>);
or simply in to a dictionary with the non T method.
public static class IniLoader
{
public static T Load<T>(string fileName)
{
T results = (T)Activator.CreateInstance(typeof(T));
PropertyInfo[] tProperties = typeof(T).GetProperties();
FieldInfo[] tFields = typeof(T).GetFields();
var iniFile = Load(fileName);
foreach (var property in tProperties)
if (iniFile.ContainsKey(property.Name))
{
object s = System.Convert.ChangeType(iniFile[property.Name].ToString(), property.PropertyType);
property.SetValue(results, s, null);
}
foreach (var field in tFields)
if (iniFile.ContainsKey(field.Name))
{
object s = System.Convert.ChangeType(iniFile[field.Name].ToString(), field.FieldType);
field.SetValue(results, s);
}
return results;
}
public static Dictionary<string, object> Load(string fileName)
{
Dictionary<string, object> results = new Dictionary<string, object>();
string fileText = File.ReadAllText(fileName);
string[] fileLines = fileText.Split('\r');
if (fileLines.Length > 0)
for (int i = 0; i < fileLines.Length; i++)
{
string line = fileLines[i].Trim();
if (!string.IsNullOrEmpty(line))
{
int equalsLocation = line.IndexOf('=');
if (equalsLocation > 0)
{
string key = line.Substring(0, equalsLocation).Trim();
string value = line.Substring(equalsLocation + 1, line.Length - equalsLocation - 1);
results.Add(key, value);
}
}
}
return results;
}
}

C# problem with object array

I am fairly new to arrays in C# and am used to storing a mass of data in a string and in INI files and then breaking it down into basic arrays using delimiters...so yeh, my knowledge is almost none existent.
My main form class begin this definition:
public CAirportData[] _AirportData; //size not known
This is the method I am using to create the array:
...string[] airports = possibleAirports.Split(','); //size is known
foreach (string airport in airports)
{
string[] rwys = inif.Read(airport, "rwys").Split(':'); //size is known (2)
_AirportData = new CAirportData[] { new CAirportData() { icao=airport, depRwy=rwys[0], arrRwy=rwys[1] } };
}
I know this just boils down to my limited knowledge of objects and arrays. But I can't seem to find anything on the internet that uses this sort of thing. I have tried to combine other peoples code with little success.
I need the _AirportData array to be available outside of the form hence public and declared outside of any methods. I supose the main problem is that I am overwriting array and foreach airport I am creating a new array hence loosing the previous. I had tried moving the ..= new CAirportData[] to all sorts of places but Visual Studio doesn't like it.
Below is the class definition for CAirportData:
public class CAirportData
{
public string icao { get; set; }
public string depRwy { get; set; }
public string arrRwy { get; set; }
public override string ToString()
{
string result = string.Format("ICAO: {0}, Dep: {1}, Arr: {2}", this.icao, this.depRwy, this.arrRwy);
return result;
}
}
public class CMRunways
{
public string icao { get; set; }
public string depRwy { get; set; }
public string arrRwy { get; set; }
}
Many thanks in advance for any help!

What you're looking for is generic List. Change the definition to:
public List<CAirportData> _AirportData = new List<CAirportData>();
Then the code in the loop to:
_AirportData.Add(new CAirportData { icao=airport, depRwy=rwys[0], arrRwy=rwys[1] });

This is what I would do...Create a static class, with a static property (airports) and add a static constructor to load the airports from file at the begining.
public static class Session
{
public static CAirportData[] _AirportData;
static Session()
{
string airports = possibleAirports.Split(",");
foreach (string airport in airports)
{
string[] rwys = inif.Read(airport, "rwys").Split(':'); //size is known (2)
_AirportData = new CAirportData[] { new CAirportData() { icao=airport, depRwy=rwys[0], arrRwy=rwys[1] } };
}
}
}
Now you can access the array anywhere in the project like
MessageBox.Show(Session.CAirportData[0].depRwy);