Question

In my project I was throwing a list of error messages

like this

 List<string> errorMessageList = errors[0].Split(new char[] { ',' }).ToList();

 throw new WorkflowException(errorMessageList);

and my WorkflowException class looks like this

/// <summary>
/// WorkFlowException class
/// </summary>
public class WorkFlowException : Exception
{
    /// <summary>
    /// Initializes a new instance of the WorkFlowException class
    /// </summary>
    /// <param name="message">Error Message</param>
    public WorkFlowException(List<string> message)
    {
        base.Message = message;
    }
}

but getting errors while assigning this list of messages to base.Message
can anybody help me to do this?

Answer 1

Exception.Message is a string, not a List<string>, and it’s read-only, so you have to pass a string to the base class via constructor chaining:

public class WorkFlowException : Exception
{
    public WorkFlowException(List<string> messages)
    : base(messages != null && messages.Count > 0 ? messages[0] : "")
    { 
      //...
    }
}

Alternatively, you can override the Message property:

public class WorkFlowException : Exception
{
    List<string> messages;

    public WorkFlowException(List<string> messages)
    { 
      this.messages = messages
    }

    public override string Message
    {
      get { return messages != null && messages.Count > 0 ? messages[0] : "" }
    }
}