Json请求后，SubSonic 2.2 RecordBase.cs中的NullReferenceException。为什么？
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我有一个使用WCF服务的MVC项目。该服务返回一个位置集合，这些位置用于过滤文本框中的自动完成功能。
最初，我使用自己的\“ Person \”对象尝试了此操作，以确保整个过程正常进行。
jQuery呼叫：
$(function () {
$(\"#txtGeoLocation\").autocomplete({
source: function (request, response) {
$.ajax({
url: \"/home/FindLocations\", type: \"POST\", dataType: \"json\",
data: { searchText: request.term, maxResults: 10 },
success: function (data) {
response($.map(data, function (item) {
return { label: item.FullName, value: item.FullName, id: item.PersonId }
// return { label: item.GeoDisplay, value: item.GeoDisplay, id: item.GeoID }
}))
}
})
},
select: function (event, ui) {
alert(ui.item ? (\"You picked \'\" + ui.item.label + \"\' with an ID of \" + ui.item.id)
: \"Nothing selected, input was \" + this.value);
}
});
});
[HttpPost]
public JsonResult FindNames(string searchText, int maxResults)
{
PersonRepository repository = new PersonRepository();
var result = repository.FindPeople(searchText, maxResults);
return Json(result);
}
public class PersonRepository
{
internal List<Person> FindPeople(string searchText, int maxResults)
{
List<Person> names = new List<Person>();
BuildNameList(names);
var result = from n in names
where n.FullName.Contains(searchText)
orderby n.FullName
select n;
return result.Take(maxResults).ToList();
}
private static void BuildNameList(List<Person> names)
{
names.Add(new Person { PersonId = 1, FullName = \"Kristina H. Chung\" });
names.Add(new Person { PersonId = 2, FullName = \"Paige H. Chen\" });
names.Add(new Person { PersonId = 3, FullName = \"Sherri E. Melton\" });
return { label: item.GeoDisplay, value: item.GeoDisplay, id: item.GeoID }
[HttpPost]
public JsonResult FindLocations(string searchText, int maxResults)
{
GeoLocationRepository repository = new GeoLocationRepository();
var result = repository.FindGeo(searchText, maxResults);
return Json(result); // returned a list collection of geo locations
}
internal List<FeederService.GeoLocation> FindGeo(string searchText, int maxResults)
{
// get geolocations from the cache
var result = from l in HttpRuntime.Cache[\"WebsiteGeoLocations\"] as FeederService.GeoLocationCollection
where l.GeoDisplay.Contains(searchText)
orderby l.GeoDisplay
select l;
return result.Take(maxResults).ToList();
}
return Json(result); // returned a list collection of geo locations
/// <summary>
/// Name of the table in the database that contains persisted data for this type
/// </summary>
/// <value>The name of the table.</value>
[XmlIgnore]
[HiddenForDataBinding(true)]
public string TableName
{
get { return BaseSchema.TableName; } // <--- error occurs here
}
[Serializable]
[CollectionDataContract]
public partial class GeoLocationCollection : ActiveList<GeoLocation, GeoLocationCollection>
{
public GeoLocationCollection() {}
没有找到相关结果
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1 个回复
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List<WebsiteGeoLocation> geoList = null; internal List<WebsiteGeoLocation> FindGeo(string searchText, int maxResults) { // get geolocations from the cache var result = from l in HttpRuntime.Cache[\"WebsiteGeoLocations\"] as FeederService.GeoLocationCollection where l.GeoDisplay.Contains(searchText) orderby l.GeoDisplay select l; geoList = new List<WebsiteGeoLocation>(); foreach (FeederService.GeoLocation location in result) { geoList.Add(new WebsiteGeoLocation { GeoID = location.GeoID, GeoDisplay = location.GeoDisplay, GeoCity = location.GeoCity, GeoState = location.GeoState, WebsiteID = location.WebsiteID, WorldCitiesID = location.WorldCitiesID }); } return geoList.Take(maxResults).ToList(); }