public void SetOrToggleSortColumn(string columnName)
{
if (SortColumns.ContainsKey(columnName))
{
SortColumns[columnName] = SortColumns[columnName].Toggle();
}
else
{
SortColumns.Clear();
SortColumns.Add(columnName, SortDirection.Ascending());
}
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
var str = value as string;
if (str == null || SortColumns.ContainsKey(str))
{
return(ValidationResult.Success);
}
return(new ValidationResult(
$"The value of {validationContext.DisplayName} must be one of the following: {string.Join(", ", SortColumns.Keys)}"));
}