C＃MVC数据类型传递给存储过程输出参数

Question

I'm trying to call a SQL server stored procedure from a C# MVC controller. The parameters for the stored procedure are as follows:

ALTER procedure [dbo].[spVehicleSearch360]
    @strLocale          nvarchar(10),
    @xmlSearchCriteria  xml,
    @strSortBy          nvarchar(30),
    @strSortDir         nvarchar(5),
    @uidSessionId       uniqueidentifier,
    @iPage                int = 1,
    @iPageSize          int = 10,
    @iCount               int output,
    @iTotalCount        int output,
    @bShowResults       bit = 1,
    @xmlResults         xml = null output,
    @dtLastItemModified datetime = null output,
    @uidVehicleInList uniqueidentifier = null
as
begin 
.........
.........
.........

When I call this from my controller:

var search_results = db.spVehicleSearch(strLocale, xmlSearchCriteria, strSortBy, strSortDir, uidSessionId, iPage, iPageSize, iCount, iTotalCount, bShowResults, xmlResults, dtLastItemModified, uidVehicleInList);

I am getting the following error for the stored procedure's output parameters (arguments 8,9,11,12)

Arugment [n]: cannot convert from [int/string/system.DateTime] to 'System.Data.Objects.ObjectParameter'

What should I be passing in for these arguments?

(Apologies if this is a very elementary question, I am very new to .net)

Thank you

Answer 1

The easiest way to address this is to just wrap the parameters that are declared as ObjectParameter in instances of that class, like this:

var iCountParam = new ObjectParameter("iCount", typeof(int));
var iTotalCountParam = new ObjectParameter("iTotalCount", typeof(int));
var xmlResultsParam = new ObjectParameter("xmlResults", typeof(string));
var dtLastItemModifiedParam = new ObjectParameter("dtLastItemModified", typeof(DateTime));

var search_results = db.spVehicleSearch(strLocale, xmlSearchCriteria, strSortBy, strSortDir, uidSessionId, iPage, iPageSize, iCountParam, iTotalCountParam, bShowResults, xmlResultsParam, dtLastItemModifiedParam, uidVehicleInList);
//using your previously declared variables...
iCount = (int)iCountParam.Value;
iTotalCount = (int)iTotalCountParam.Value;
//since these are nullable params, gotta check before casting
//you can obviously use whatever you want for the value if it is indeed null
xmlResults = Convert.IsDBNull(xmlResultsParam.Value) ? null : (string)xmlResultsParam.Value;
dtLastItemModified = Convert.IsDBNull(dtLastItemModifiedParam.Value) ? DateTime.MinValue : (DateTime)dtLastItemModifiedParam.Value;

Entity Framework has a hard time dealing with output parameters in this way, and wraps them in the generic ObjectParameter type to make things easier, although it means more boiler-plate code for you.