让存储过程可以插入空值

 

数据库层存数据

 1            SqlParameter[] 
 2                parameters = {
 3                                 new SqlParameter("@EmailAddress", SqlDbType.VarChar, 255),
 4                                 new SqlParameter("@Password", SqlDbType.Binary, 100),
 5                                 new SqlParameter("@FirstName", SqlDbType.VarChar, 30),
 6                                 new SqlParameter("@LastName", SqlDbType.VarChar, 50),
 7                                 new SqlParameter("@Address1", SqlDbType.VarChar, 80),
 8                                 new SqlParameter("@Address2", SqlDbType.VarChar, 80),
 9                                 new SqlParameter("@City", SqlDbType.VarChar, 40),
10                                 new SqlParameter("@State", SqlDbType.VarChar, 40),                                 
11                                 new SqlParameter("@ZipCode", SqlDbType.VarChar, 20),
12                                 new SqlParameter("@HomePhone", SqlDbType.VarChar, 20),
13                                 new SqlParameter("@Country", SqlDbType.VarChar, 50),
14                                 new SqlParameter("@UserID", SqlDbType.Int, 4)
15                             };
16
17            parameters[0].Value = emailAddress;
18            parameters[1].Value = password;
19            parameters[2].Value = firstName;
20            parameters[3].Value = lastName;
21            parameters[4].Value = address1;
22            //parameters[5].Value = DBNull.Value;
23            parameters[5].Value = address2;
24            parameters[6].Value = city;
25            parameters[7].Value = state;
26            parameters[8].Value = zipCode;
27            parameters[9].Value = homePhone;
28            parameters[10].Value = country;
29            parameters[11].Direction = ParameterDirection.Output;

上层取值

 1        //根据ID获取，回写对象
 2        private void LoadFromID()
 3        {
 4            Data.User dataUser = new Data.User( moduleSettings.ConnectionString );
 5            DataRow userRow = dataUser.Retrieve( userID );
 6
 7            firstName= (string)userRow["FirstName"];
 8            lastName = (string)userRow["LastName"];
 9            address1 = (string)userRow["Address1"];
10            //address2 = (string)userRow["Address2"];
11            address2 = (userRow["Address2"] == DBNull.Value) ? null : userRow["Address2"].ToString();
12            city     = (string)userRow["City"];
13            state    = (string)userRow["State"];
14            zipCode  = (string)userRow["ZipCode"];
15            homePhone= (string)userRow["HomePhone"];
16            emailAddress = (string)userRow["EmailAddress"];
17            password = (byte[])userRow["Password"];
18            country=(string)userRow["Country"];
19        }

表现层

 1        public void BindContent()
 2        {
 3            FirstName.Text = this.user.FirstName;
 4            EmailAddress.Text = this.user.EmailAddress;
 5            LastName.Text = this.user.LastName;
 6            Address1.Text = this.user.Address1;
 7            Address2.Text = this.user.Address2;
 8            ZipCode.Text = this.user.ZipCode;
 9            City.Text = this.user.City;
10            HomePhone.Text = this.user.HomePhone;
11            State.Text = this.user.State;
12
13            this.BindUserRoles();
14        }