Question

我收到了以下代码：

var model = new List<LogModels>();

while (reader.Read())
{
     var logContent = new LogModels(
         (int)reader["id"],
         (string)reader["response"],
         (string)reader["language"],
         (string)reader["country"],
         (string)reader["location"],
         (string)reader["os"],
         (string)reader["browser"],
         (string)reader["type"],
         (DateTime)reader["date"]
      );

     model.Add(logContent);
}

但是我收到以下错误：

An exception of type 'System.InvalidCastException' occurred in Speed Services.dll but was not handled in user code

Additional information: Specified cast is not valid.

图片：https://i.gyazo.com/adf04b8e271bb53c93303d5774a48f80.png

我的模型（LogModels）看起来像这样：

public int id { get; set; }
public string response { get; set; }
public string language { get; set; }
public string country { get; set; }
public string location { get; set; }
public string os { get; set; }
public string browser { get; set; }
public string type { get; set; }
public DateTime date { get; set; }

有人知道问题是什么，因为我似乎无法找到问题吗？

Answer 1

var model = new List<LogModels>();

while (reader.Read())
{
     var logContent = new LogModels(
         Convert.ToInt32(reader["id"].Tostring()),
         (string)reader["response"],
         (string)reader["language"],
         (string)reader["country"],
         (string)reader["location"],
         (string)reader["os"],
         (string)reader["browser"],
         (string)reader["type"],
         Convert.ToDateTime(reader["date"].Tostring())
      );

     model.Add(logContent);
}

由于整数或日期时间值而导致转换问题。 (int)reader["Id"]代替Convert.ToInt32(reader["Id"].Tostring()) (DateTime)reader["date"]代替Convert.ToDateTime(reader["date"].Tostring())

指定的强制转换在ASP.NET中无效？

1 个答案: