c# - 将字符串转换为连接到mysql的gridview中的日期

Question

如何在通过对象数据源连接到Mysql的 GridView 中将字符串转换为日期。对于 CoopF_From 和 CoopF_To 列。Convert.ToDateTime“显示日期和时间，我只想显示日期”

数据访问层代码

namespace Demo.CoopF
{
    public class CoopF
    {
        public string CoopF_FName { get; set; }
        public string CoopF_MName { get; set; }
        public string CoopF_LName { get; set; }
        public int CoopF_ID { get; set; }
        public string CoopF_Mobile { get; set; }
        public string CoopF_Email { get; set; }
        public string CoopF_From { get; set; }
        public string CoopF_To { get; set; }



    }
    public class CoopFDataAccessLayer
    {
        public static void UpdateCoop( int CoopF_ID, string CoopF_FName, string CoopF_MName, string CoopF_LName, string CoopF_Mobile, string CoopF_Email, string CoopF_From, string CoopF_To)
        {
            string CF = "server=localhost; userid=; password=; database=; allowuservariables=True";
            using (MySqlConnection connection = new MySqlConnection(CF))
            {
                string UpdateQuery = " Update coop_female SET CoopF_FName=@CoopF_FName," + " CoopF_MName=@CoopF_MName," + " CoopF_LName=@CoopF_LName," + "CoopF_Mobile=@CoopF_Mobile," + "CoopF_Email=@CoopF_Email,"+ "CoopF_From=@CoopF_From,"+"CoopF_To=@CoopF_To=@CoopF_To WHERE CoopF_ID=@CoopF_ID";
                MySqlCommand cmd = new MySqlCommand(UpdateQuery, connection);
                cmd.Connection.Open();
                MySqlParameter paramCoopF_FName = new MySqlParameter("@CoopF_FName", CoopF_FName);
                cmd.Parameters.Add(paramCoopF_FName);
                MySqlParameter paramCoopF_MName = new MySqlParameter("@CoopF_MName", CoopF_MName);
                cmd.Parameters.Add(paramCoopF_MName);
                MySqlParameter paramCoopF_LName = new MySqlParameter("@CoopF_LName", CoopF_LName);
                cmd.Parameters.Add(paramCoopF_LName);
                MySqlParameter paramCoopF_ID = new MySqlParameter("@CoopF_ID", CoopF_ID);
                cmd.Parameters.Add(paramCoopF_ID);
                MySqlParameter paramCoopF_Mobile = new MySqlParameter("@CoopF_Mobile", CoopF_Mobile);
                cmd.Parameters.Add(paramCoopF_Mobile);
                MySqlParameter paramCoopF_Email = new MySqlParameter("@CoopF_Email", CoopF_Email);
                cmd.Parameters.Add(paramCoopF_Email);
                MySqlParameter paramCoopF_From = new MySqlParameter("@CoopF_From", Convert.ToDateTime(CoopF_From));
                cmd.Parameters.Add(paramCoopF_From);
                MySqlParameter paramCoopF_To = new MySqlParameter("@CoopF_To", Convert.ToDateTime(CoopF_To));
                cmd.Parameters.Add(paramCoopF_To);
                cmd.ExecuteNonQuery();
                cmd.Connection.Close();

            }
        }
        public static List<CoopF> GetAllEmployees()
        {
            List<CoopF> listCoopF = new List<CoopF>();
            string CF = "server=localhost; userid=; password=; database=; allowuservariables=True";
            using (MySqlConnection connection = new MySqlConnection(CF))
            {
                MySqlCommand cmd = new MySqlCommand("Select * from coop_female", connection);
                connection.Open();
                MySqlDataReader rdr = cmd.ExecuteReader();
                while (rdr.Read())
                {
                    CoopF coop = new CoopF();
                    coop.CoopF_FName = rdr["CoopF_FName"].ToString();
                    coop.CoopF_MName = rdr["CoopF_MName"].ToString();
                    coop.CoopF_LName = rdr["CoopF_LName"].ToString();
                    coop.CoopF_ID = Convert.ToInt32(rdr["CoopF_ID"]);
                    coop.CoopF_Mobile = rdr["CoopF_Mobile"].ToString();
                    coop.CoopF_Email = rdr["CoopF_Email"].ToString();
                    coop.CoopF_From = rdr["CoopF_From"].ToString();
                    coop.CoopF_To= rdr["CoopF_To"].ToString();


                    listCoopF.Add(coop);


                }
            }
            return listCoopF;
        }

        public static void DeleteCoop(int CoopF_ID)
        {
            string CF = "server=localhost; userid=; password=; database=; allowuservariables=True";
            using (MySqlConnection connection = new MySqlConnection(CF))
            {
                string UpdateQuery = " Delete from Coop_female WHERE CoopF_ID=@CoopF_ID";
                MySqlCommand cmd = new MySqlCommand(UpdateQuery, connection);
                MySqlParameter param = new MySqlParameter("@CoopF_ID", CoopF_ID);
                cmd.Parameters.Add(param);
                cmd.Connection.Open();
                cmd.ExecuteNonQuery();
                cmd.Connection.Close();

            }

        }

        public static void InsertCoop(string CoopF_FName, string CoopF_MName, string CoopF_LName, int CoopF_ID, string CoopF_Mobile, string CoopF_Email, string CoopF_From, string CoopF_To)
        {
            string CF = "server=localhost; userid=; password=; database=; allowuservariables=True";
            using (MySqlConnection connection = new MySqlConnection(CF))
            {
                string UpdateQuery = " INSERT INTO Coop_female (CoopF_FName, CoopF_Mname, CoopF_LName, CoopF_ID, CoopF_Mobile, CoopF_Email, CoopF_From, CoopF_To)" + " VALUES (@CoopF_FName,@CoopF_MName,@CoopF_LName,@CoopF_ID,@CoopF_Mobile,@CoopF_Email,@CoopF_From,@CoopF_To)";
                MySqlCommand cmd = new MySqlCommand(UpdateQuery, connection);
                MySqlParameter paramCoopF_FName = new MySqlParameter("@CoopF_FName", CoopF_FName);
                cmd.Parameters.Add(paramCoopF_FName);
                MySqlParameter paramCoopF_MName = new MySqlParameter("@CoopF_MName", CoopF_MName);
                cmd.Parameters.Add(paramCoopF_MName);
                MySqlParameter paramCoopF_LName = new MySqlParameter("@CoopF_LName", CoopF_LName);
                cmd.Parameters.Add(paramCoopF_LName);
                MySqlParameter paramCoopF_ID = new MySqlParameter("@CoopF_ID", CoopF_ID);
                cmd.Parameters.Add(paramCoopF_ID);
                MySqlParameter paramCoopF_Mobile = new MySqlParameter("@CoopF_Mobile", CoopF_Mobile);
                cmd.Parameters.Add(paramCoopF_Mobile);
                MySqlParameter paramCoopF_Email = new MySqlParameter("@CoopF_Email", CoopF_Email);
                cmd.Parameters.Add(paramCoopF_Email);
                MySqlParameter paramCoopF_From = new MySqlParameter("@CoopF_From", Convert.ToDateTime(CoopF_From));
                cmd.Parameters.Add(paramCoopF_From);
                MySqlParameter paramCoopF_To = new MySqlParameter("@CoopF_To", Convert.ToDateTime(CoopF_To));
                cmd.Parameters.Add(paramCoopF_To);
                cmd.Connection.Open();
                cmd.ExecuteNonQuery();
                cmd.Connection.Close();
            }
        }
    }
}               

in code behind 


protected void lbInsert_Click(object sender, EventArgs e)
    {
        ObjectDataSource1.InsertParameters["CoopF_FName"].DefaultValue=((TextBox)GridView1.FooterRow.FindControl("TxtFName")).Text;
        ObjectDataSource1.InsertParameters["CoopF_MName"].DefaultValue = ((TextBox)GridView1.FooterRow.FindControl("TxtMName")).Text;
        ObjectDataSource1.InsertParameters["CoopF_LName"].DefaultValue = ((TextBox)GridView1.FooterRow.FindControl("TxtLName")).Text;
        ObjectDataSource1.InsertParameters["CoopF_ID"].DefaultValue = ((TextBox)GridView1.FooterRow.FindControl("TxtID")).Text;
        ObjectDataSource1.InsertParameters["CoopF_Mobile"].DefaultValue = ((TextBox)GridView1.FooterRow.FindControl("TxtMobile")).Text;
        ObjectDataSource1.InsertParameters["CoopF_Email"].DefaultValue = ((TextBox)GridView1.FooterRow.FindControl("TxtEmail")).Text;
        ObjectDataSource1.InsertParameters["CoopF_From"].DefaultValue = ((TextBox)GridView1.FooterRow.FindControl("TxtFrom")).Text;
        ObjectDataSource1.InsertParameters["CoopF_To"].DefaultValue = ((TextBox)GridView1.FooterRow.FindControl("TxtTo")).Text;
        ObjectDataSource1.Insert();
    }   

Answer 1

您可以使用以下内容:

Convert.ToDateTime(CoopF_From).Date;

它只会为您提供日期值