MVC Binding to a transformed property - asp.net-mvc

Question

I have an object class Tag {string Key; string Text;} and an object Record that is bind to a storage table.
class Record { [...Id & other properties...]
public string Name { get; set; } // "FirstRecord"
public string Tags { get; set; } // "3,4,9"
}
Updating the Name does not present a problem. But I have some difficulties with the Tags... As you can see the Tags property is the CSV of int keys (say {1:".net",2:"java",3:"perl" ...}).
In the Record's Edit View I build a dictionary with all available Tags:
Dictionary<string, string> tags = ViewData["tags"] as Dictionary<string, string>;
[...]
<div class="form-group">
<label class="col-md-2 control-label">Tags</label>
<div class="col-md-10">
#foreach (var tag in tags)
{
<div class="checkbox-inline">
<label for="tag_#tag.Key">
<input type="checkbox" id="tag_#tag.Key" value="#tag.Key" />
#tag.Value
</label>
</div>
}
</div>
</div>
And finally I have the Edit Post controller, like this
// POST: Records/Edit/5
[HttpPost, ValidateAntiForgeryToken]
public async Task<IActionResult> Edit(string id, [Bind("Id,Name")] Record record)
{
if (id != record.Id) {
return NotFound();
}
if (ModelState.IsValid) {
try {
await repository.UpdateTableEntityAsync(record);
}
catch (Exception) { [...] }
return RedirectToAction("Index");
}
return View(record);
}
So, I am confused if I should Bind Tags, like [Bind("Id,Name,Tags")], because that value should be taken from all the checked check-boxes values, then concatenated as CSV to be ready to be updated in the storage...

Answer 1

If you want to bind the checkbox values to a string, you could get all the values of checkbox and set the value of model manually. Code below is for your reference.
In view, add a name property for checkbox.
<input type="checkbox" name="tag_#tag.Key" id="tag_#tag.Key" value="#tag.Key" />
In action, we could get all the values of checkbox using Request.Form.
[HttpPost, ValidateAntiForgeryToken]
public async Task<IActionResult> Edit(string id, [Bind("Id,Name")] Record record)
{
if (id != record.Id)
{
return NotFound();
}
record.Tags = "";
foreach (var key in Request.Form.AllKeys)
{
if (key.StartsWith("tag_"))
{
record.Tags += Request.Form[key] + ",";
}
}
if (record.Tags.Length > 0)
{
record.Tags = record.Tags.Remove(record.Tags.Length - 1, 1);
}
if (ModelState.IsValid)
{
try
{
await repository.UpdateTableEntityAsync(record);
}
catch (Exception)
{
}
return RedirectToAction("Index");
}
return View(record);
}