public static async Task InitializeData(TreeContext context)
{
context.Database.Migrate();
if (!context.Nodes.Any())
{
var node = new DbNode[]
{
new DbNode
{
Level = 0,
Name = "root",
ParentId = null
}
};
context.Nodes.AddRange(node);
await context.SaveChangesAsync();
var rootId = context.Nodes.FirstOrDefault().IdNode;
var nodes = new DbNode[] {
new DbNode
{
Level = 1,
Name = "First",
ParentId = rootId
},
new DbNode
{
Level = 1,
Name = "Second",
ParentId = rootId
},
new DbNode
{
Level = 1,
Name = "Text",
ParentId = rootId
},
new DbNode
{
Level = 1,
Name = "Any",
ParentId = rootId
}
};
context.Nodes.AddRange(nodes);
await context.SaveChangesAsync();
}
}
public async Task <List <VMDeleteNodeResult> > DeleteAsync(Guid id)
{
List <DbNode> deletedNodes = new List <DbNode>();
var node = new DbNode
{
IdNode = id
};
try
{
var result = _context.Nodes.Remove(node);
deletedNodes.Add(result.Entity);
var childs = await _context.Nodes.Where(x => x.ParentId == result.Entity.IdNode).Select(x => x.IdNode).ToListAsync();
foreach (var childId in childs)
{
node = new DbNode
{
IdNode = childId
};
result = _context.Nodes.Remove(node);
deletedNodes.Add(result.Entity);
}
}
catch (ArgumentException)
{
return(null);
}
await _context.SaveChangesAsync();
var viewModels = new List <VMDeleteNodeResult>();
foreach (var deletedNode in deletedNodes)
{
var viewModel = new VMDeleteNodeResult();
viewModel.IdNode = deletedNode.IdNode;
viewModels.Add(viewModel);
}
return(viewModels);
}
public async Task SaveChangesAsync()
{
await _context.SaveChangesAsync();
}