Firebird .NET 数据适配器：没有错误消息编号的消息

当使用 Firebird 3 数据库（服务器）但通过 .NET 库 FirebirdSql.Data.FirebirdClient 连接时（我尝试了 V. 7.10.1 和最新的 10.3.2），出现以下错误（在此示例中，我的 drop-constraint 语句有问题）：

FirebirdSql.Data.FirebirdClient.FbException：元数据更新
ALTER TABLE mytable 失败，
未找到错误代码 336068738 的消息。

我尝试将firebird.msg文件复制到system32和文件夹。我还尝试使用此处所述的wow64环境变量FIREBIRD_MSG=C:\Program Files\Firebird\Firebird_3_0\firebird.msg

它似乎对我通过错误的 SQL 语句生成的任何错误不起作用。

例如，我收到的另一个错误编号是 336068731。

代码如下：

if (DbProviderFactories.GetFactory("FirebirdSql.Data.FirebirdClient") is not FirebirdClientFactory fac)
{
    throw new InvalidOperationException("FirebirdSql.Data.FirebirdClient.dll could not be loaded.");
}

var host = "localhost";
var user = "SYSDBA";
var pass = "masterkey";
var db = $"c:/databases/DelphiIn2025QuestionmarkQuestionmark.fdb";

var bld = new FbConnectionStringBuilder
{
    Charset = "NONE",
    DataSource = host,
    Database = db,
    UserID = user,
    Password = pass,
    WireCrypt = FbWireCrypt.Enabled
};

using (var con = fac.CreateConnection() as FbConnection)
{
    if (con == null) 
    { 
        throw new InvalidOperationException("No FbConnection returned..."); 
    }

    con.ConnectionString = bld.ConnectionString;
    con.Open();

    using (var cmd = fac.CreateCommand() as FbCommand)
    {
        if (cmd == null) { throw new InvalidOperationException("No FbCommand returned..."); }
        cmd.Connection = con;

        cmd.CommandText = "alter table mytable drop constraint PK_uid";
        cmd.ExecuteNonQuery();
    }
}