本文介绍了通过jquery调用Web服务时,我收到此错误。任何的想法的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
这是我得到的错误
here is the error that i get
System.InvalidOperationException: Missing parameter: MyParameterName.
at System.Web.Services.Protocols.ValueCollectionParameterReader.Read(NameValueCollection collection)
at System.Web.Services.Protocols.UrlParameterReader.Read(HttpRequest request)
at System.Web.Services.Protocols.HttpServerProtocol.ReadParameters()
at System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()
<pre>
[WebService(Namespace="http://microsoft.com/webservices/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
[System.Web.Script.Services.ScriptService]
public class WebService1 : System.Web.Services.WebService
{
[WebMethod]
[System.Web.Script.Services.ScriptMethod(ResponseFormat = System.Web.Script.Services.ResponseFormat.Json)]
public List<string> MethodName(string parameterName)
{
List<string> result = new List<string>();
using (System.Data.SqlClient.SqlConnection con = new System.Data.SqlClient.SqlConnection("connectionstring"))
{
using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand("mydbasequery, con))
{
con.Open();
cmd.Parameters.AddWithValue("@xxx", parameterName);
System.Data.SqlClient.SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
result.Add(dr["column_name"].ToString());
}
return result.ToList();
}
}
}
else
{
result.Add("sample");
return result.ToList();
}
}
<pre lang="Javascript">
<pre> <script type="text/javascript">
$(document).ready(function () {
functionName();
});
function functionName() {
$('.classname').autocomplete({
source: function (request, response) {
$.ajax({
async: true,
type: "POST",
contentType: "application/json; charset=utf-8",
data: "{'service_parameter' :'" + $('.classname').val() + "'}",
url: 'WebService1.asmx/MethodName',
dataType: "json",
crossDomain: true,
success: function (data) {
if (data != null) {
response(data.d);
}
else {
response("rule");
}
},
error: function (error) {
response("rule");
}
});
},
minLength: 10,
});
}
</script>
我尝试了什么:
我试过这段代码但仍然一遍又一遍地得到这个错误..
What I have tried:
I tried this code and still getting this error over and over again..
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