Question

这是NserviseBus总线的代码，我在运行该代码时遇到错误。错误＆＃34; mscorlib.dll无法提取＆＃39; MySqlPassword＆＃39;来自环境变量＆＃34;请帮助我。谢谢....

using System;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;
using NServiceBus;
using NServiceBus.Persistence.Sql;

class Program
{
    static async Task Main()
    {
        Console.Title = "Samples.SqlPersistence.EndpointMySql";

        #region MySqlConfig

        var endpointConfiguration = new EndpointConfiguration("Samples.SqlPersistence.EndpointMySql");

        var transport = endpointConfiguration.UseTransport<MsmqTransport>();

 transport.Transactions(TransportTransactionMode.SendsAtomicWithReceive);

        var persistence = endpointConfiguration.UsePersistence<SqlPersistence>();

        var password = Environment.GetEnvironmentVariable("root");
        if (string.IsNullOrWhiteSpace(password))
        {
            throw new Exception("Could not extract 'MySqlPassword' from Environment variables.");
        }
        var username = Environment.GetEnvironmentVariable("root");
        if (string.IsNullOrWhiteSpace(username))
        {
            throw new Exception("Could not extract 'MySqlUserName' from Environment variables.");
        }
        var connection = $"server=localhost;user= 
        {username};database=sqlpersistencesample;port=3306;password= 
        {password};AllowUserVariables=True;AutoEnlist=false";
        persistence.SqlDialect<SqlDialect.MySql>();
        persistence.ConnectionBuilder(
        connectionBuilder: () =>
            {
                return new MySqlConnection(connection);
            });
        var subscriptions = persistence.SubscriptionSettings();
        subscriptions.CacheFor(TimeSpan.FromMinutes(1));

        #endregion

        endpointConfiguration.UseTransport<LearningTransport>();
        endpointConfiguration.EnableInstallers();

        var endpointInstance = await Endpoint.Start(endpointConfiguration)
        .ConfigureAwait(false);

        Console.WriteLine("Press any key to exit");
        Console.ReadKey();

        await endpointInstance.Stop()
            .ConfigureAwait(false);
    }
 }

如何解决mscorlib.dll无法提取＆＃39; MySqlPassword＆＃39;来自环境变量..？请帮帮我..

Answer 1

鉴于该错误消息似乎来自您的代码，即来自

        var password = Environment.GetEnvironmentVariable("root");
        if (string.IsNullOrWhiteSpace(password))
        {
            throw new Exception("Could not extract 'MySqlPassword' from Environment variables.");
        }

我猜测没有root环境变量或者有一个环境变量，并且它被设置为空字符串。

另外，鉴于您稍后尝试从同一环境变量中读取用户名，我认为这里出了问题。

Answer 2

代码试图从计算机的环境变量集合中提取用户名和密码。根据运行环境的操作系统，这些设置将有所不同。

如果您在Windows中运行，则可以通过搜索＆＃34;编辑系统环境变量＆＃34;来编辑环境变量。在开始菜单中。

或者，您可以直接在代码中设置变量来跳过环境变量访问：

// ...
var password = "root";
var username = "root";
var connection = $"server=localhost;user={username};database=sqlpersistencesample;port=3306;password={password};AllowUserVariables=True;AutoEnlist=false";
// ...

如何解决mscorlib.dll无法提取＆＃39; MySqlPassword＆＃39;来自环境变量..？

2 个答案: