我有联系人列表:
public class Contact
{
private string _firstName;
private string _lastName;
private int _age;
/// <summary>
/// Constructor
/// </summary>
/// <param name="fname">Contact's First Name</param>
/// <param name="lname">Contact's Last Name</param>
/// <param name="age">Contact's Age</param>
public Contact(string fname, string lname, int age)
{
_firstName = fname;
_lastName = lname;
_age = age;
}
/// <summary>
/// Contact Last Name
/// </summary>
public string LastName
{
get
{
return _lastName;
}
set
{
_lastName = value;
}
}
/// <summary>
/// Contact First Name
/// </summary>
public string FirstName
{
get
{
return _firstName;
}
set
{
_firstName = value;
}
}
/// <summary>
/// Contact Age
/// </summary>
public int Age
{
get
{
return _age;
}
set
{
_age = value;
}
}
}
我在这里创建我的列表:
private List<Contact> _contactList;
_contactList = new List<Contact>();
_contactList.Add(new Contact("John", "Jackson", 45));
_contactList.Add(new Contact("Jack", "Doe", 20));
_contactList.Add(new Contact("Jassy", "Dol", 19));
_contactList.Add(new Contact("Sam", "Josin", 44));
现在,我正在尝试使用LINQ在单独的列表中获取所有联系人的所有名字。
到目前为止,我尝试了:
public List<string> FirstNames
{
get
{
return _contactList.Where(C => C.FirstName.ToList());
}
}
您要使用Select
方法,而不是Where
这里:
_contactList.Select(C => C.FirstName).ToList();
此外,ToList()
仅存在property
需求是因为需求。IEnumerable<string>
如果您想摆脱它,可以返回一个代替。
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