Mvc ModelState.isValid爲false時，檢查時那個字段不符合規則的代碼

List<string> sb = new List<string>();
//獲取全部錯誤的Key
List<string> Keys = ModelState.Keys.ToList();
//獲取每個key對應的ModelStateDictionary
foreach (var key in Keys)
{
var errors = ModelState[key].Errors.ToList();
//將錯誤描述添加到sb中
foreach (var error in errors)
{
sb.Add(key.ToString() + ":" + error.ErrorMessage);
}
}