如何使用 SelectToken 将 c# 中的字符串转换为枚举

Question

Please refer to the below-given code snippet

foreach (var invoiceDescription in qbInvoiceLineArray)
{
    Line lineDescription = new Line();
    lineDescription.Description = Convert.ToString((string)invoiceDescription.SelectToken(QBConfig.InvoiceDescription));
    invoice.Line.Add(lineDescription);             
} 
    
public class QbInvoiceViewModel
{
    public decimal Balance { get; set; }       
    public List<LinkedTxn> LinkedTxn { get; set; }
    public DateTime DueDate { get; set; }
    public DateTime TxnDate { get; set; }
    public Decimal TotalAmt { get; set; }
    public List<Line> Line { get; set; }    
}
    
public class Line
{
    public string Description { get; set; }
    public LineDetailTypeEnum DetailType { get; set; }
}
    
public enum LineDetailTypeEnum
{
    SalesItemLineDetail
}

This line of code

lineDescription.Description = Convert.ToString((string)invoiceDescription.SelectToken(QBConfig.InvoiceDescription));

can be used to convert string to string in c#. This type of code can be used to convert string to int also in c#. But how this type of code can be used to convert string to enum?

Answer 1

You don't use Convert.ToString to strings to other things, you use Convert.ToXxx

If invoiceDescription.SelectToken(QBConfig.InvoiceDescription) is returning you a string (or an object that is actually a string, as your cast might indicate) of the enum member name or value, and you want it converting to a particular enum, you should Enum.Parse<T> it, like var e = Enum.Parse<InvoiceToken>((string)invoiceDescription.SelectToken(QBConfig.InvoiceDescription)) , of course replacing InvoiceToken with the actual name of your enum

If invoiceDescription.SelectToken(QBConfig.InvoiceDescription) is returning you an int that is the enum member value (not the name) you can also alternatively Convert.ToInt32() it and then cast it to the enum type; any int can be cast to an enum

MSDN for enum parse

(It's probably also worth noting that Enum.Parse<T> is more recent than other forms; if youre on an older version of .NET you're looking at something more like (T)Enum.Parse(typeof(T), string_here) )