Question

public UserAccount(List<string> data)
{
    this.UserIDNumber = data[0]; //issue here
    this.name = data[1];
    this.Username = data[2];
    this.Password = data[3];
    this.Birthday = data[4]; //issue here
    this.Address = data[5];
    this.City = data[6];
}

我遇到的问题是我无法转换两种数据类型。如果我使用this.Birthday.Tostring()和this.UserIDNumber.ToString()

我收到错误：作业的左侧必须是var，prop或indexer。

Answer 1

您需要将字符串显式转换为正确的类型。

public UserAccount(List<string> data)
{
    this.UserIDNumber = Convert.ToInt32(data[0]); 
    this.name = data[1];
    this.Username = data[2];
    this.Password = data[3];
    this.Birthday = DateTime.Parse(data[4]); 
    this.Address = data[5];
    this.City = data[6];
}

或者安全的方式，如果转换失败，则不会抛出异常。但请记住，如果您没有处理默认值，那么您可以获得损坏的数据。

public UserAccount(List<string> data)
{
    int id;
    this.UserIDNumber = int.TryParse(data[0], out id) ? id : 0; 
    this.name = data[1];
    this.Username = data[2];
    this.Password = data[3];
    DateTime date;
    this.Birthday = DateTime.TryParse(data[4], out date) ? date : DateTime.MinValue; 
    this.Address = data[5];
    this.City = data[6];
}

Answer 2

试试这个：

 this.UserIDNumber = Convert.ToInt32(data[0]);
 this.Birthday = DateTime.Parse(data[4]);

Answer 3

我最终做了什么（对于这个和日期时间）

this.ErrorMessage = string.Empty;

  int parseInt = 0;
  if (!int.TryParse(data[0], out parseInt))
  {
    this.ErrorMessage += "Error Parsing the account number! data was: " + data[0];
    this.AcctNumber = -1;
  }
  else
  {
    this.AcctNumber = parseInt;
  }

c＃list <string>无法将字符串转换为datetime，字符串转换为int

3 个答案: