WCF中的删除方法 [英] Delete method in WCF
问题描述
我正在为此寻找一种LINQ删除方法:
I'm looking for a LINQ delete method for this:
<ArrayOfGroup>
<Group>
<GroupName>c</GroupName>
<StudentList>
<Student>
<TimeAdded>0001-01-01T00:00:00</TimeAdded> // trying to delete from here
<StudentID>1</StudentID>
<FirstName>a</FirstName>
<LastName>b</LastName> // to here
<StudentGroup/>
</Student>
</StudentList>
</Group>
</ArrayOfGroup>
出于某种原因,当我以这种方式删除它时:
For some reason when I delete it this way:
[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)]
public class Service : IService
{
List<Student> students = new List<Student>();
List<Group> Groups = new List<Group>();
public void removeStudent(string studentID)
{
students.Remove(students.Find(f => f.StudentID.Equals(studentID)));
//var result = students.Where(n => String.Equals(n.StudentID, studentID)).FirstOrDefault();
//if (result == null)
//{
// result.StudentGroup.Remove(StudentList.Student.Find(f => f.StudentID.Equals(studentID)));
//}
// students.RemoveAll(f => f.StudentID.Equals(studentID)); also tryed this
}
它不会将其从ArrayOfGroup的学生列表"/学生"区域中删除,因此我受够了尝试解决为什么不删除它的问题,而只是想找到一种将其与原始记录一起删除的新方法.我觉得这样做很像罪犯,但如果有人能提供帮助,我将不胜感激.
It doesn't remove it from the Student List/ student area of my ArrayOfGroup, so I am fed up trying to solve why it isn't deleting and just trying to find a new way to delete it along with the original records. I feel like a criminal for doing this but if anyone can help would be much appreciated.
我的数据合同如下:
[DataContract(Name="Student")]
public class Student
{
public Student()
{
StudentGroup = new List<Group>();
}
[DataMember(Name = "StudentID")]
public string StudentID { get; set; }
[DataMember(Name = "FirstName")]
public string FirstName { get; set; }
[DataMember(Name = "LastName")]
public string LastName { get; set; }
[DataMember(Name = "TimeAdded")]
public DateTime TimeAdded;
public string TimeAddedString
{
get
{
return this.TimeAdded.ToString("dd/MM/yyyy hh:mm:ss");
}
}
public List<Group> StudentGroup { get; set; }
}
[DataContract(Name = "Group")]
public class Group
{
public Group()
{
StudentList = new List<Student>();
}
[DataMember(Name = "GroupName")]
public string GroupName { get; set; }
public List<Student> StudentList { get; set; }
}
如果有帮助,这是如何将学生添加到组中?
This is how a student is added to a group if it helps?
public void AddStudentToGroup(string group, string studentID, string firstName, string lastName)
{
var result = Groups.Where(n => String.Equals(n.GroupName, group)).FirstOrDefault();
var result1 = students.Where(n => String.Equals(n.StudentID, studentID)).FirstOrDefault();
if (result != null)
{
result.StudentList.Add(new Student() { StudentID = studentID, FirstName = firstName, LastName = lastName });
}
if (result1 != null)
{
result1.StudentGroup.Add(new Group() { GroupName = group });
}
}
推荐答案
您可以在List<T>
对象上使用Remove
方法,该方法采用如下谓词:
You can use the Remove
method on the List<T>
object which takes a predicate like so:
students.RemoveAll(s => s.StudentId == 5);
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