System.IO.Packaging.Package.CheckIsReadOnly C# (CSharp) Méthode

        internal void CheckIsReadOnly()
        {
            if (FileOpenAccess == FileAccess.Read)
                throw new IOException("Operation not valid when package is read-only");
        }

 public void DeleteRelationship(string id)
 {
     Package.CheckIsReadOnly();
     CheckIsRelationship();
     Relationships.Remove(id);
     WriteRelationships();
 }