List<string> sb = new List<string>();

//获取所有错误的Key

List<string> Keys = ModelState.Keys.ToList();

//获取每一个key对应的ModelStateDictionary

foreach (var key in Keys)

{

var errors = ModelState[key].Errors.ToList();

//将错误描述添加到sb中

foreach (var error in errors)

{

sb.Add(key.ToString() + ":" + error.ErrorMessage);

}

}