public Task BindModelAsync(ModelBindingContext bindingContext)
{
const string modelName = "filterBy";
var valueProviderResult = bindingContext.ValueProvider.GetValue(modelName);
if (valueProviderResult == ValueProviderResult.None)
{
return(Task.CompletedTask);
}
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, valueProviderResult);
var filterExpressions = valueProviderResult.Values.ToString().Split(",");
var parsedFilter = FilterOptions.FromArray(filterExpressions);
if (parsedFilter.GetKeyValuePairs().Count() != valueProviderResult.Length)
{
const string errorMessage = "Failed to convert all filter expressions in URI. Maybe a colon is missing.";
bindingContext.ModelState.AddModelError(bindingContext.ModelName, errorMessage);
if (parsedFilter.HasPredicates == false)
{
bindingContext.Result = ModelBindingResult.Failed();
return(Task.CompletedTask);
}
// Else: Result not ModelBindingResult.Failed() because some expressions could be parsed.
}
bindingContext.Model = parsedFilter;
bindingContext.Result = ModelBindingResult.Success(parsedFilter);
return(Task.CompletedTask);
}