/// <summary>
/// Converts comma separated values into a typed array.
/// </summary>
/// <param name="bindingContext"></param>
/// <returns></returns>
public Task BindModelAsync(ModelBindingContext bindingContext)
{
if (!bindingContext.ModelMetadata.IsEnumerableType)
{
return(Task.FromResult(0));
}
ValueProviderResult csvString = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
if (csvString.Equals(ValueProviderResult.None))
{
return(Task.FromResult(0));
}
try
{
Type elementType = bindingContext.ModelMetadata.ElementType;
TypeConverter converter = TypeDescriptor.GetConverter(elementType);
var defaultValues = csvString.FirstValue.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries)
.Select(x => converter.ConvertFromString(x)).ToArray();
Array typedValues = Array.CreateInstance(elementType, defaultValues.Length);
defaultValues.CopyTo(typedValues, 0);
bindingContext.ModelState.SetModelValue(bindingContext.ModelName, csvString);
bindingContext.Result = ModelBindingResult.Success(typedValues);
}
catch (Exception e)
{
if (e is FormatException && e.InnerException != null)
{
e = ExceptionDispatchInfo.Capture(e.InnerException).SourceException;
}
bindingContext.ModelState.TryAddModelError(bindingContext.ModelName, e, bindingContext.ModelMetadata);
}
return(Task.FromResult(0));
}