Question

我已经看到构造函数链接的答案，但它们不适用于我的问题。

我有一个以下构造函数需要几个参数：

public SerilogHelper(string conString, int minLevel)
    {
        var levelSwitch = new LoggingLevelSwitch();
        levelSwitch.MinimumLevel = (Serilog.Events.LogEventLevel)(Convert.ToInt32(minLevel));

        _logger = new LoggerConfiguration()
            .MinimumLevel.ControlledBy(levelSwitch)
            .WriteTo.MSSqlServer(connectionString: conString, 
                                 tableName: "Logs", 
                                 autoCreateSqlTable: true)
            .CreateLogger();
    }

此构造函数的一个特定客户端将不具有参数所需的值，因此我希望能够调用这个简单的构造函数，该构造函数将获得所需的值，然后调用第一个构造函数：

public SerilogHelper()
    {
        string minLevel = SSOSettingsFileManager.SSOSettingsFileReader.ReadString(
          "LCC.Common", "serilog.level");
        string conString = SSOSettingsFileManager.SSOSettingsFileReader.ReadString(
          "LCC.Common", "serilog.connectionstring");

        SerilogHelper(conString, minLevel);
    }

问题是，我在第二个构造函数的调用中得到了一个红色波浪形，消息 SerilogHelper是一个'类型'但是像'变量'一样使用

Answer 1

你做不到。你有它的最佳选择，所以将初始化代码移动到一个单独的方法，你可以从两个构造函数调用它。允许。

public SerilogHelper()
{
    string minLevel = SSOSettingsFileManager.SSOSettingsFileReader.ReadString(
      "LCC.Common", "serilog.level");
    string conString = SSOSettingsFileManager.SSOSettingsFileReader.ReadString(
      "LCC.Common", "serilog.connectionstring");

    this.Initialize(conString, minLevel);
}

public SerilogHelper(string conString, int minLevel)
{
    this.Initialize(conString, minLevel);
}

protected void Initialize(string conString, int minLevel)
{
    var levelSwitch = new LoggingLevelSwitch();
    levelSwitch.MinimumLevel = (Serilog.Events.LogEventLevel)(Convert.ToInt32(minLevel));

    _logger = new LoggerConfiguration()
        .MinimumLevel.ControlledBy(levelSwitch)
        .WriteTo.MSSqlServer(connectionString: conString, 
                             tableName: "Logs", 
                             autoCreateSqlTable: true)
        .CreateLogger();
}

Answer 2

为什么不简单地添加这些参数？

// this assumes that SSOSettingsFileManager is static class
// this will automatically call these methods before passing 
// values to another ( non parameterless ) constructor
public SerilogHelper()
    : this ( 
        SSOSettingsFileManager.SSOSettingsFileReader.ReadString(
            "LCC.Common", "serilog.connectionstring"
        ),
        SSOSettingsFileManager.SSOSettingsFileReader.ReadString(
            "LCC.Common", "serilog.level"
        )
    )
{

}

// This will be called from default ( parameterless )
// constructor with values retrieved from methods
// called in previous constructor.
public SerilogHelper(string conString, int minLevel)
{
        var levelSwitch = new LoggingLevelSwitch();
        levelSwitch.MinimumLevel = (Serilog.Events.LogEventLevel)(Convert.ToInt32(minLevel));

        _logger = new LoggerConfiguration()
            .MinimumLevel.ControlledBy(levelSwitch)
            .WriteTo.MSSqlServer(connectionString: conString, 
                                 tableName: "Logs", 
                                 autoCreateSqlTable: true)
            .CreateLogger();
}

Test online

Answer 3

我建议使用默认值：

public SerilogHelper(string conString = null, int minLevel = -1)
{
    if (minLevel == -1)
      minLevel = SSOSettingsFileManager.SSOSettingsFileReader.ReadString(
      "LCC.Common", "serilog.level");

    if (conString == null)
      conString = SSOSettingsFileManager.SSOSettingsFileReader.ReadString(
      "LCC.Common", "serilog.connectionstring");

    var levelSwitch = new LoggingLevelSwitch();
    levelSwitch.MinimumLevel = (Serilog.Events.LogEventLevel)(Convert.ToInt32(minLevel));

    _logger = new LoggerConfiguration()
        .MinimumLevel.ControlledBy(levelSwitch)
        .WriteTo.MSSqlServer(connectionString: conString, 
                             tableName: "Logs", 
                             autoCreateSqlTable: true)
        .CreateLogger();
}

...

SerilogHelper myInstance = new SerilogHelper();

修改：我认为minLevel = -1 无效可以用作默认值，如果不是这样的话（ any < / em> minLevel值是允许的）int?是一种可能的出路：

public SerilogHelper(string conString = null, int? minLevel = null) { if (!minLevel.HasValue) minLevel = SSOSettingsFileManager.SSOSettingsFileReader.ReadString( "LCC.Common", "serilog.level"); if (conString == null) conString = SSOSettingsFileManager.SSOSettingsFileReader.ReadString( "LCC.Common", "serilog.connectionstring"); var levelSwitch = new LoggingLevelSwitch(); levelSwitch.MinimumLevel = (Serilog.Events.LogEventLevel)(Convert.ToInt32(minLevel)); _logger = new LoggerConfiguration() .MinimumLevel.ControlledBy(levelSwitch) .WriteTo.MSSqlServer(connectionString: conString, tableName: "Logs", autoCreateSqlTable: true) .CreateLogger(); }

C＃构造函数在执行代码后调用构造函数

3 个答案: