public static GraphvizContext Initialise()
{
lock (LockObject)
{
if (singletonContext != null)
{
throw new InvalidOperationException("Context already created");
}
var contextPtr = NGraphvizNative.gvContext();
if (contextPtr == IntPtr.Zero)
{
throw new InvalidOperationException("Failed to initialise Graphviz context");
}
singletonContext = new GraphvizContext(contextPtr);
}
return singletonContext;
}
private static void ContextDisposed()
{
lock (LockObject)
{
singletonContext = null;
}
}
