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How to: Execute a Parameterized Entity SQL Query Using EntityCommand

.NET Framework 4.5

This topic shows how to execute an Entity SQL query that has parameters by using an EntityCommand object.

To run the code in this example

Add the AdventureWorks Sales Model to your project and configure your project to use the Entity Framework. For more information, see How to: Use the Entity Data Model Wizard (Entity Framework).

In the code page for your application, add the following using statements (Imports in Visual Basic):


using System;
using System.Collections.Generic;
using System.Collections;
using System.Data.Common;
using System.Data;
using System.IO;
using System.Data.SqlClient;
using System.Data.EntityClient;
using System.Data.Metadata.Edm;

Example

The following example shows how to construct a query string with two parameters. It then creates an EntityCommand, adds two parameters to the EntityParameter collection of that EntityCommand, and iterates through the collection of Contact items.


using (EntityConnection conn =
new EntityConnection("name=AdventureWorksEntities"))
{
conn.Open();
// Create a query that takes two parameters.
string esqlQuery =
@"SELECT VALUE Contact FROM AdventureWorksEntities.Contacts
AS Contact WHERE Contact.LastName = @ln AND
Contact.FirstName = @fn";

using (EntityCommand cmd = new EntityCommand(esqlQuery, conn))
{
// Create two parameters and add them to
// the EntityCommand's Parameters collection
EntityParameter param1 = new EntityParameter();
param1.ParameterName = "ln";
param1.Value = "Adams";
EntityParameter param2 = new EntityParameter();
param2.ParameterName = "fn";
param2.Value = "Frances";

cmd.Parameters.Add(param1);
cmd.Parameters.Add(param2);

using (DbDataReader rdr = cmd.ExecuteReader(CommandBehavior.SequentialAccess))
{
// Iterate through the collection of Contact items.
while (rdr.Read())
{
Console.WriteLine(rdr["FirstName"]);
Console.WriteLine(rdr["LastName"]);
}
}
}
conn.Close();
}

How to: Execute a Parameterized Entity SQL Query Using EntityCommand

To run the code in this example

Example

See Also

Concepts

Other Resources