Question

我正在尝试设置自动属性，但它们是非静态的，因此在尝试设置属性凭据，证书和UrlEndPoint时，我收到错误“无法访问静态上下文中的非静态属性”。

public class PayPalProfile
{
    #region Fields

    static PayPalProfile _instance;

    #endregion

    #region Constructors

    PayPalProfile()
    {
        // is only called if a new instance is created
        SetProfileState();
    }

    #endregion

    #region Properties

    public static PayPalProfile CurrentProfile
    {
        get
        {
            if (_instance == null)
                _instance = new PayPalProfile();

            return _instance;
        }
    }

    public CustomSecurityHeaderType Credentials { get; private set; }

    public X509Certificate2 Certificate { get; private set; }

    public string UrlEndPoint { get; private set;}

    #endregion

    #region Methods

    private static void SetProfileState()
    {
        // Set the profile state
        SetApiCredentials();
        SetPayPalX509Certificate();
    }

    private static void SetApiCredentials()
    {
        Credentials = new CustomSecurityHeaderType
                           {
                                Credentials =
                                {
                                    Username = PayPalConfig.CurrentConfiguration.ApiUserName,
                                    Password = PayPalConfig.CurrentConfiguration.ApiPassword
                                }
                           };

        UrlEndPoint = PayPalConfig.CurrentConfiguration.ExpressCheckoutSoapApiEndPoint;
    }


    private static void SetPayPalX509Certificate()
    {
        PayPalCerfiticate paypalCertificate = new PayPalCerfiticate();

        Certificate = paypalCertificate.PayPalX509Certificate;
    }

    #endregion
}

Answer 1

SetProfileState，SetApiCredentials和SetPayPalX509Certificate不需要是静态的。

SetApiCredentials和SetPayPalX509Certificate是非静态属性的设置值，因此需要一个实例。通过从上述方法中删除静态修饰符，将在调用SetProfileState时在正构造的实例上设置属性。

Answer 2

这意味着您有一个静态方法，您尝试分配实例属性。由于静态方法/属性中没有可用的实例，因此会给出错误。

示例：

public class Test {
  public int InstanceProperty { get; set; }
  public static void StaticMethod() {
    InstanceProperty = 55; // ERROR HERE
  }
}

相反，应该是静态或实例上下文：

public class Test {
  public static int StaticProperty { get; set; }
  public static void StaticMethod() {
    StaticProperty = 55; // Ok
  }
}

public class Test {
  public int InstanceProperty { get; set; }
  public void InstanceMethod() {
    InstanceProperty = 55; // Ok
  }
}

帮助Singleton - 设置自动属性？

2 个答案: