System.InvalidCastException: 'The SqlParameterCollection only accepts non-null SqlParameter type objects, not SqlParameter objects.'

Question

我将我的项目从 ASP.NET Core 2.2 迁移到 ASP.NET Core 3.0。现在我得到这个例外。在 ASP.NET Core 2.2 中，它使用 FromSql()；现在它正在使用 FromSqlRaw()。我正在使用 Entity Framework Core.

调用我的程序

SqlParameter Username = new SqlParameter
            {
                ParameterName = "USERNAME",
                SqlDbType = SqlDbType.NVarChar,
                Value = user.Username,
                Direction = ParameterDirection.Input,
                Size = 50
            };

SqlParameter Password = new SqlParameter
            {
                ParameterName = "PASSWORD",
                SqlDbType = SqlDbType.NVarChar,
                Value = user.Password,
                Direction = ParameterDirection.Input,
                Size = 50
            };

SqlParameter msgOut = new SqlParameter
            {
                ParameterName = "MSG",
                SqlDbType = SqlDbType.NVarChar,
                Direction = ParameterDirection.Output,
                Size = 1000
            };

SqlParameter statusOut = new SqlParameter
            {
                ParameterName = "STATUS",
                SqlDbType = SqlDbType.Int,
                Direction = ParameterDirection.Output
            };

var sql = @"EXEC PRC_USERS_LOGIN
                        @USERNAME, 
                        @PASSWORD, 
                        @MSG OUT, 
                        @STATUS OUT";

Users resultUser = new Users();
resultUser = ctx.Users.FromSqlRaw(sql, Username, Password, msgOut, statusOut)
                      .FirstOrDefault();

Answer 1

已通过将使用 System.Data.SqlClient 更改为使用 Microsoft.Data.SqlClient

来修复

https://github.com/aspnet/EntityFrameworkCore/issues/16812#issuecomment-516013245

Answer 2

此代码在替换后有效

System.Data.SqlClient.SqlParameter

到

Microsoft.Data.SqlClient.SqlParameter

和

FirstOrDefault();

到

ToList();