值得学习的代码2

 1  public string GetSWhere()
 2         {
 3             StringBuilder sb = new StringBuilder();
 4             sb.Append("select UserId,RealName,UserName,pwd,Phase,QQ from UserInfor where 1=1 ");
 5             string username = txtSUserName.Text.Trim();
 6             if (!string.IsNullOrEmpty(username))
 7             {
 8                 sb.Append(string.Format(" and UserName=‘{0}‘", username));
 9             }
10             if (ddlSPhase.SelectedIndex > 0)
11             {
12                 sb.Append(string.Format(" and Phase=‘{0}‘", ddlSPhase.SelectedValue));
13             }
14             return sb.ToString();
15         }