Question

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。

Answer 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。

Web API抛出未处理的异常错误

1 个答案: