C# 将数据库中的内容存储到列表中
C# store contents from DB into list
C#代码:
try
{
string mydbConnection = "datasource=localhost;port=3306;username=root;password=Greenford123;";
MySqlConnection connDB = new MySqlConnection(mydbConnection);
MySqlCommand cmdDataBase = new MySqlCommand("SELECT * FROM project.student", connDB);
MySqlDataReader DBReader;
connDB.Open();
DBReader = cmdDataBase.ExecuteReader();
while (DBReader.Read())
{
List<string> mylist = new List<string>();
mylist.Add(DBReader.ToString());
foreach (var item in mylist)
{
MessageBox.Show("The details are " + item);
}
}
connDB.Close();
}
catch(Exception ex)
{
MessageBox.Show("Error! " + ex);
}
Objective:
我想在我的代码中实现的是:
-将数据库中的内容存储到列表中,然后输出列表。
然而这是我得到的输出:
OUTPUT = "the details are MySQL.Data.MySqlClient.MySqlDataReader"
也许您应该遍历字段:
while (DBReader.Read())
{
List<string> mylist = new List<string>();
for(int i=0; i<DBReader.FieldCount; i++)
myList.Add(DBReader.GetValue(i).ToString());
foreach (var item in mylist)
{
MessageBox.Show("The details are " + item);
}
}
否则您的数据读取器只是转换为字符串,默认情况下它只是显示其 class 名称。
C#代码:
try
{
string mydbConnection = "datasource=localhost;port=3306;username=root;password=Greenford123;";
MySqlConnection connDB = new MySqlConnection(mydbConnection);
MySqlCommand cmdDataBase = new MySqlCommand("SELECT * FROM project.student", connDB);
MySqlDataReader DBReader;
connDB.Open();
DBReader = cmdDataBase.ExecuteReader();
while (DBReader.Read())
{
List<string> mylist = new List<string>();
mylist.Add(DBReader.ToString());
foreach (var item in mylist)
{
MessageBox.Show("The details are " + item);
}
}
connDB.Close();
}
catch(Exception ex)
{
MessageBox.Show("Error! " + ex);
}
Objective:
我想在我的代码中实现的是:
-将数据库中的内容存储到列表中,然后输出列表。
然而这是我得到的输出:
OUTPUT = "the details are MySQL.Data.MySqlClient.MySqlDataReader"
也许您应该遍历字段:
while (DBReader.Read())
{
List<string> mylist = new List<string>();
for(int i=0; i<DBReader.FieldCount; i++)
myList.Add(DBReader.GetValue(i).ToString());
foreach (var item in mylist)
{
MessageBox.Show("The details are " + item);
}
}
否则您的数据读取器只是转换为字符串,默认情况下它只是显示其 class 名称。