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?从程序中构造sql语句执行时可用，防止多重判断
?sb.Append( ” AND( 1=2 ” );
??????????? if (chkFilter.Items[0].Selected)
??????????? {
??????????????? sb.Append(” OR ADSource=””);
??????????? }
??????????? if (chkFilter.Items[1].Selected)
??????????? {
??????????????? sb.Append(” OR SearchKey=””);
??????????? }
??????????? if (chkFilter.Items[2].Selected)
??????????? {
??????????????? sb.Append(” OR WebSource=””);
??????????? }
??????????? sb.Append( ” )” );