c# - DbParameterCollection不包含AddWithValue的定义

Question

在以下代码的最后一行获得上述错误。我正在使用EF Core 1.1。尝试遵循this建议。

using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.SqlClient; //Visual Studio had greyed out this line suggesting this as unnecessary.

var conn = _context.Database.GetDbConnection();

var cmd = conn.CreateCommand();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "MySproc";
cmd.Parameters.AddWithValue("@MyParameter", 42);

Answer 1

添加对System.Data.SqlClient的引用，并将DbConnection实例强制转换为SqlConnection。