protected override List <object> _Filter(List <object> _unfilteredData, string _displayMember, string userInput)
{
int count = userInput.Length - 1;
string userLetters = userInput.ToLower();
List <object> results = new List <object>();
foreach (var obj in _unfilteredData)
{
var itemLetters = GetFilterString(obj, _displayMember).ToLower();
if (count < itemLetters.Length)
{
char currentLetter = itemLetters[count];
// 如果是英文
if (CharUtil.IsEnglishLetter(currentLetter))
{
if (currentLetter.ToString().ToLower()[0] == userLetters[count])
{
results.Add(obj);
}
continue;
}
}
}
return(results);
}