In this article I will explain with an example, how to pass parameter to Stored Procedure using Dapper library in ASP.Net Core MVC (.Net Core).
Note: For beginners in ASP.Net Core (.Net Core 7), please refer my article ASP.Net Core 7: Hello World Tutorial with Sample Program example.
 
 

Installing Dapper package using Nuget

In order to install Dapper library using Nuget, please refer my article Install Dapper from Nuget in Visual Studio.
 
 

Database

I have made use of the following table Customers with the schema as follows.
ASP.Net Core: Pass parameter to Stored Procedure using Dapper
 
I have already inserted few records in the table.
ASP.Net Core: Pass parameter to Stored Procedure using Dapper
 
Note: You can download the database table SQL by clicking the download link below.
          Download SQL file
 
 

Stored Procedure

The following Stored Procedure is used to display the records from SQL Server database.
This Stored Procedure accepts Country as a parameter, which is used to display the records from Customers Table.
CREATE PROCEDURE [Customers_GetCustomersByCountry]
      @Country VARCHAR(50)
AS
BEGIN
    SET NOCOUNT ON;  
    SELECT [CustomerId]
          ,[Name]
          ,[Country]
    FROM [Customers]
    WHERE [Country] = @Country
END
 
 

Model

The Model class consists of following properties.
public class Customer
{
    public int CustomerId { get; set; }
    public string Name { get; set; }
    public string Country { get; set; }
}
 
 

Namespaces

You will need to import the following namespaces.
using Dapper;
using System.Data;
using System.Data.SqlClient;
 
 

Controller

Inside the Controller the IConfiguration class is injected into the Constructor (HomeController) with using Dependency Injection method.
Finally, the injected object is assigned to the Configuration property.
Note: For more details on Dependency Injection, please refer my article .Net Core 7: Dependency Injection in ASP.Net Core.
 
The Controller consists of following Action methods.

Action Method for handling GET operation

Inside this Action method, simply the View is returned.
 

Action Method for handling POST operation

This Action method accepts Country value as parameter.
Inside this Action method, a DynamicParameters class object is created and Country value is passed as a parameter.
Finally, the name of the Stored Procedure and the DynamicParameters class object is passed to the Query method of the Dapper library and returned to the View.
public class HomeController : Controller
{
    public IConfiguration Configuration { get; set; }
    public HomeController(IConfiguration _configuration)
    {
        this.Configuration = _configuration;
    }
 
    public IActionResult Index()
    {
        return View();
    }
 
    [HttpPost]
    public IActionResult Index(string country)
    {
        string spName = "Customers_GetCustomersByCountry";
        string constr = this.Configuration.GetSection("ConnectionStrings")["MyConn"];
        using (SqlConnection con = new SqlConnection(constr))
        {
            DynamicParameters dynamicParameters = new DynamicParameters();
            // Adding parameter.
            dynamicParameters.Add("@Country", country);
            return View(con.Query<Customer>(spName, dynamicParameters, commandType: CommandType.StoredProcedure));
        }
    }
}
 
 

View

HTML Markup

Inside the View, in the very first line the CustomerModel class is declared as Model for the View.
The View consists of an HTML Form which has been created using the following TagHelpers attributes.
asp-action – Name of the Action. In this case the name is Index.
asp-controller – Name of the Controller. In this case the name is Home.
method – It specifies the Form Method i.e. GET or POST. In this case it will be set to POST.
The View also consists of an HTML Table, which consists of DropDownList created using HTML.DropDownList method respectively and a Submit button.
 

Submiting the Form

When the Submit button is clicked, the Customer is checked for NULL and if it is not NULL then, records are displayed using HTML Table. A FOR EACH loop will be executed over the Model which will generate the HTML Table rows with the Customer records.
@using Dapper_Parameter_SP_Core_MVC.Models
@model List<Customer>
@{
    Layout = null;
}
 
<!DOCTYPE html>
 
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>Index</title>
</head>
<body>
    <form method="post" asp-controller="Home" asp-action="Index">
        <table cellpadding="0" cellspacing="0">
            <tr>
                <td>Country: </td>
                <td>
                    @Html.DropDownList("Country", new List<SelectListItem>
                    {
                        new SelectListItem { Text = "United States", Value = "United States" },
                        new SelectListItem { Text = "India", Value = "India" },
                        new SelectListItem { Text = "France", Value = "France" },
                        new SelectListItem { Text = "Russia", Value = "Russia" }}, "Please select")
                </td>
            </tr>
            <tr>
                <td></td>
                <td><input type="submit" value="Submit" /></td>
            </tr>
        </table>
    </form>
    @if (Model != null)
    {
        <hr/>
        <table cellpadding="0" cellspacing="0">
            <tr>
                <th>Customer Id</th>
                <th>Name</th>
                <th>Country</th>
            </tr>
            @foreach (Customer customer in Model)
            {
                <tr>
                    <td>@customer.CustomerId</td>
                    <td>@customer.Name</td>
                    <td>@customer.Country</td>
                </tr>
            }
        </table>
    }
</body>
</html>
 
 

Screenshot

ASP.Net Core: Pass parameter to Stored Procedure using Dapper
 
 

Downloads

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