最佳重载匹配具有一些无效的集合 c#

本文关键字：无效 集合 具有一 重载 最佳 | 更新日期: 2023-09-27 17:55:11

我正在为四个示例对象创建一个数据库，在创建数据库时，我收到错误。 下面是构造函数的代码：

public DriverLicense(string condition, string dateofissue, int number, int type)
{
    Condition = condition;
    DateOfIssue = dateofissue;
    Number = number;
    Type = type;
}

以防万一，数据库的代码：

DriverLicense[] Licenses = new DriverLicense[4];
Licenses[0] = new DriverLicense("Supervised at all times", "3/6/2013", "176325", "2");
Licenses[1] = new DriverLicense("Unsupervised at all times", "2/5/2006", "18364", "3");
Licenses[2] = new DriverLicense("Supervised at all times", "6/1/2011", "472957", "2");
Licenses[3] = new DriverLicense("Unsupervised at all times", "8/4/2009", "648217", "3");

最佳重载匹配具有一些无效的集合 c#

构造函数需要两个String和两个int 

  public DriverLicense(string condition, string dateofissue, int number, int type) {
    ...
  }

但是您发送了四个string： 

  // "176325" is a String as well as "2"
  new DriverLicense("Supervised at all times", "3/6/2013", "176325", "2");

可能的解决方案是更改实例创建 

  DriverLicense[] Licenses = new DriverLicense[] {
    // Note 176325 and 2 are int, not string
    new DriverLicense("Supervised at all times", "3/6/2013", 176325, 2),
    new DriverLicense("Unsupervised at all times", "2/5/2006", 18364, 3),
    new DriverLicense("Supervised at all times", "6/1/2011", 472957, 2),
    new DriverLicense("Unsupervised at all times", "8/4/2009", 648217, 3),
  }

或实现重载构造函数：

  public DriverLicense(string condition, string dateofissue, String number, String type)
    : this(condition, dateofissue, int.Parse(number), int.Parse(type)) {
  }

所以你可以很容易地把

  DriverLicense[] Licenses = new DriverLicense[] {
    // the overloaded constructor accepts strings
    new DriverLicense("Supervised at all times", "3/6/2013", "176325", "2"),
    new DriverLicense("Unsupervised at all times", "2/5/2006", "18364", "3"),
    new DriverLicense("Supervised at all times", "6/1/2011", "472957", "2"),
    new DriverLicense("Unsupervised at all times", "8/4/2009", "648217", "3"),
  }

您使用了一些错误的参数类型。请尝试使用以下代码：

Licenses[1] = new DriverLicense("Unsupervised at all times", "2/5/2006", 18364, 3);
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