Question

我想传递一个对象作为defUserInfo方法的默认值，但这不可能，因为它不是compile-time constant。有没有其他方法可以使这项工作？

private static CustomerIdentifications defUserInfo = new CustomerIdentifications
{
    CustomerID = "1010",
    UniqueIdentifier = "1234"
};
public static HttpResponseMessage GenerateToken<T>(T userInfo = defUserInfo)
{
   // stuff
    return response;
}

Answer 1

您可以使用重载方法：

public static HttpResponseMessage GenerateToken()
{
    return GenerateToken(defUserInfo);
}
public static HttpResponseMessage GenerateToken<T>(T userInfo)
{
   // stuff
    return response;
}

Answer 2

如果CustomerIdentifications是一个结构，你可以通过使用struct属性而不是字段来模拟默认值：

using System;

struct CustomerIdentifications
{
    private string _customerID;
    private string _uniqueIdentifier;

    public CustomerIdentifications(string customerId, string uniqueId)
    {
      _customerID = customerId;
      _uniqueIdentifier = uniqueId;
    }

    public string CustomerID { get { return _customerID ?? "1010"; } }
    public string UniqueIdentifier { get { return _uniqueIdentifier ?? "1234"; } }
}

class App
{
  public static void Main()
  {
    var id = GenerateToken<CustomerIdentifications>();
    Console.WriteLine(id.CustomerID);
    Console.WriteLine(id.UniqueIdentifier);
  }

  public static T GenerateToken<T>(T userInfo = default(T))
  {
    // stuff
    return userInfo;
  }
}

将不稳定的默认参数传递给C＃方法

2 个答案: