Using Dapper, how do I pass in the values for a sql type as param?

问题

I'm attempting to use dapper and pass into a stored procedure a list of integers which I have defined here using DDL

CREATE TYPE [dbo].[BrandIDSet] AS TABLE ([BrandID] INT NULL);

I've created this stored procedure:

CREATE PROCEDURE dbo.usp_getFilteredCatalogItems 
    @BrandIDSet [dbo].[BrandIDSet] READONLY

and attempting to pass in in c# code the value for that parameter as

public async Task<PaginatedCatalogItemsVM> GetFilteredCatalogItems(int pageSize, int pageNumber, List<int> brandIDSet)
{
     ..
     string storedProcName = "dbo.usp_getFilteredCatalogItems";
     paginatedItemsVM.CatalogItemResults = await connection.QueryAsync<CatalogItemVM>(storedProcName, new { BrandIDSet = brandIDSet }, commandType: CommandType.StoredProcedure);

However, dapper does not seem to be converting the list as expected. With the above code, it results in the following SQL getting executed

exec dbo.usp_getFilteredCatalogItems @BrandIDSet1=1

Which isn't right, since BrandIDSet1 is not the name of the parameter. Arg. Thus, it results in

SqlException: @BrandIDSet1 is not a parameter for procedure usp_getFilteredCatalogItems.

How do I get the type to convert to the proper SQL?

回答1:

You can pass DataTable for proper result. You can try the code below;

var dt = new DataTable();
dt.Columns.Add(new DataColumn("BrandID", typeof(int)));
foreach (var id in brandIDSet)
{
    var row = dt.NewRow();
    row["BrandId"] = id;
    dt.Rows.Add(row);
}

string storedProcName = "dbo.usp_getFilteredCatalogItems";
paginatedItemsVM.CatalogItemResults = await connection.QueryAsync<CatalogItemVM>(storedProcName, new { BrandIDSet = dt }, commandType: CommandType.StoredProcedure);

来源：https://stackoverflow.com/questions/52683331/using-dapper-how-do-i-pass-in-the-values-for-a-sql-type-as-param