我通过Web API进行了以下数据库调用:
public IEnumerable<PogStoreData> GetStoreSetData(string FloorplanIdList, string PogIdList, string PogName, string Season, string Version,
string PogStatusList, Nullable<DateTime> IssueDate, Nullable<DateTime> StartDate, Nullable<DateTime> LiveDate,
Nullable<DateTime> ExpirationDate, string PogMoveTypeList)
{
// Create the parameters collection
var parameters = new Collection<SqlParameter>();
// Add each parameter. Entity will not work without all params in the correct order
parameters.Add(StoredProcedureParameterBuilder.StringParam("@fpIdList", string.IsNullOrEmpty(FloorplanIdList) ? null : FloorplanIdList, -1));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@pogIdList", string.IsNullOrEmpty(PogIdList) ? null : PogIdList, -1));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@pogName", string.IsNullOrEmpty(PogName) ? null : PogName, 100));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@season", string.IsNullOrEmpty(Season) ? null : Season, -1));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@version", string.IsNullOrEmpty(Version) ? null : Version, -1));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@pogStatusList", string.IsNullOrEmpty(PogStatusList) ? null : PogStatusList, 10));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@issueDate", IssueDate.HasValue ? IssueDate.Value.ToShortDateString() : null, 20));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@startDate", StartDate.HasValue ? StartDate.Value.ToShortDateString() : null, 20));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@liveDate", LiveDate.HasValue ? LiveDate.Value.ToShortDateString() : null, 20));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@expirationDate", ExpirationDate.HasValue ? ExpirationDate.Value.ToShortDateString() : null, 20));
parameters.Add(StoredProcedureParameterBuilder.StringParam("@pogMoveList", string.IsNullOrEmpty(PogMoveTypeList) ? null : PogMoveTypeList, 10));
return SelectList<PogStoreData>("spc.SPA_get_store_set_data_by_criteria", parameters);
}
以下是SelectList的代码:
private IEnumerable<T> SelectList<T>(string inStoredProcedure, ICollection<SqlParameter> inParameters)
{
string paramNames = string.Join(",", inParameters.Select(parameter => parameter.ParameterName).ToList());
string sqlString = inStoredProcedure + " " + paramNames;
object[] paramValues = inParameters.Cast<object>().ToArray();
if (paramValues.Length > 0)
return this.Database.SqlQuery<T>(sqlString, paramValues).ToList();
else
return this.Database.SqlQuery<T>(sqlString).ToList();
}
但是当我仅为PogStatus列表传递值时,我收到以下错误: 转换为值类型'System.Double'失败,因为具体化值为null。 我在SqlQuery(sqlString).ToList()语句中收到上述错误。 我不知道如何解决这个问题。请帮忙。
答案 0 :(得分:1)
最可能的原因是您的double
类型中有PogStoreData
类型的字段/属性,但查询会为其返回null。
尝试直接在数据库中执行此存储过程(例如在Management Studio中),并将结果与您希望接收的数据进行比较。