我嘗試將參數發送到asmx(web服務文件),但我得到關於「System.InvalidOperationException:Missing parameter」的錯誤。請幫我解決這個問題,太感謝你了System.InvalidOperationException:缺少參數
這是我的AJAX功能
$("#dd_address").change(function() {
var rowID = $(this).find(':selected').val();
console.log(rowID);
$.ajax({
url: "WebService.asmx/queryCity",
data: {
id: JSON.stringify(rowID),
},
type: "POST",
dataType: "json",
contentType: "application/json; charset-utf-8",
success: OnSuccess,
error: OnError
});
});
這是ASMX
DataTable result;
[WebMethod(EnableSession = true)]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public string queryCity(string id)
{
DataTable dt;
SqlConnection MRK_Conn = new SqlConnection(@"Data Source=192.168.24.30;Initial Catalog=Marketing_Data;Persist Security info=True;User ID=sa;Password=sa");
SqlCommand cmd = new SqlCommand();
SqlDataReader sql_dr;
System.Web.Script.Serialization.JavaScriptSerializer serializer = new System.Web.Script.Serialization.JavaScriptSerializer();
MRK_Conn.Open();
cmd = new SqlCommand("select [City RowID], [City Description] from City where [Des Ref Province] = '" + id + "'", MRK_Conn);
dt = new DataTable();
sql_dr = cmd.ExecuteReader();
dt.Load(sql_dr);
sql_dr.Close();
MRK_Conn.Close();
result = dt;
return serializer.Serialize(result);
}
,並在網絡配置文件我的代碼
<webServices>
<protocols>
<add name="HttpGet"/>
<add name="HttpPost"/>
</protocols>
</webServices>
這是似曾相識易於sql注入,你應該考慮改變查詢SqlCommand +參數在至少 – Neps 2015-03-31 16:20:48
但錯誤Missing參數它意味着參數從ajax不發送到asmx。對不對? – user3001046 2015-03-31 16:41:55