Forcing classes to implement ToString()
There are situations where it would be useful to force a class that implements an interface to override the ToString() method.
public interface ITask
{
void Execute();
string ToString();
}
In this case, I can execute a list of tasks and log any exceptions that occur. The ToString() method can provide a way to log information about the state or progress of a task when an exception occurs. The exception and stack trace may not be able to provide enough information in all situations.
foreach (ITask task in tasks)
{
try
{
task.Execute();
}
catch (Exception e)
{
Log.Error("Error occurred: " + task.ToString(), e);
}
}
Unfortunately, there isn’t a way to force a class to override the ToString() method, even if the method signature is present on the interface. Instead, we can use abstract classes to enforce this by using the abstract and override modifiers together:
public abstract class Task
{
public abstract void Execute();
public abstract override string ToString();
}
Any classes that derive from Task will be required to override the ToString() method.
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