以前用command方法執行存儲過程增加參數時,總是先用cmd.Parameters.Add方法來設置參數和參數類型,再用Parameters[0].Value來給參數賦值。以前的一個動作代碼示例:
string strConn = "Data Source=.;Initial Catalog=HISDB;Integrated Security=True";
using( SqlConnection conn = new SqlConnection(strConn))
{
conn.Open();
SqlCommand cmd = new SqlCommand("AuditMessageInsert", conn);
//設置命令類型爲存儲過程,沒有設置的話會執行失敗
cmd.CommandType = CommandType.StoredProcedure;
//設置參數名和類型
cmd.Parameters.Add("@Target", SqlDbType.NChar);
cmd.Parameters.Add("@Description", SqlDbType.NChar);
cmd.Parameters.Add("@Actor", SqlDbType.NChar);
cmd.Parameters.Add("@Time", SqlDbType.DateTime);
cmd.Parameters.Add("@Computer", SqlDbType.NChar);
//給參數賦值
cmd.Parameters[0].Value = "ATarget";
cmd.Parameters[1].Value = "Description";
cmd.Parameters[2].Value = "Actor";
cmd.Parameters[3].Value = DateTime.Now;
cmd.Parameters[4].Value = "PC-Computer";
cmd.ExecuteNonQuery();
}
如果用Parameters.AddWithValue方法就不用這麼麻煩了,可以直接加參數名和其值,不用再設置參數的類型,示例代碼:
string strConn = "Data Source=.;Initial Catalog=HISDB;Integrated Security=True";
using( SqlConnection conn = new SqlConnection(strConn))
{
conn.Open();
SqlCommand cmd = new SqlCommand("AuditMessageInsert", conn);
cmd.CommandType = CommandType.StoredProcedure;
//增加參數:名稱與類型 且與表中參數的順序沒關係
cmd.Parameters.AddWithValue("@Actor", "Actor");
cmd.Parameters.AddWithValue("@Target", "Target");
cmd.Parameters.AddWithValue("@Description", "Description");
cmd.Parameters.AddWithValue("@Computer", "Computer");
cmd.Parameters.AddWithValue("@Time", DateTime.Now);
cmd.ExecuteNonQuery();
}