在C#中的问题比较 [英] Comparision problem in C#
问题描述
我创建了一个 BinaryTreeNode< T>
类,然后创建 添加(T数据)
对于 二叉树<方法; T>
类。
I have created a BinaryTreeNode<T>
class and then creating Add(T data)
method for BinaryTree<T>
class.
当我尝试比较对象的值编译器说:
When I try to compare Values of objects compiler says :
运算符'<'不能适用于类型'T'和'T'
实例操作数:
public void AddNode(T data) {
BinaryTreeNode<T> node = new BinaryTreeNode<T>(data);
BinaryTreeNode<T> temp = root;
if (temp.Value < node.Value) // **PROBLEM HERE**
...
我是C#小白和使用VS08 Express版本。请帮忙
I'm C# noob and using VS08 Express Edition. Please help.
推荐答案
您应该添加一个约束,使得T必须实现 IComparable的< T>
然后使用:
You should add a constraint such that T must implement IComparable<T>
and then use that:
public class BinaryTree<T> where T : IComparable<T>
{
public void AddNode(T data)
{
BinaryTreeNode<T> node = new BinaryTreeNode<T>(data);
BinaryTreeNode<T> temp = root;
if (temp.Value.CompareTo(node.Value) < 0)
...
另一种方法是在的IComparer<通过; T>
并使用:
An alternative is to pass in an IComparer<T>
and use that:
public class BinaryTree<T> where T : IComparable<T>
{
private readonly IComparer<T> comparer;
public BinaryTree(IComparer<T> comparer)
{
this.comparer = comparer;
...
}
public void AddNode(T data)
{
BinaryTreeNode<T> node = new BinaryTreeNode<T>(data);
BinaryTreeNode<T> temp = root;
if (comparer.Compare(temp.Value, node.Value) < 0)
这是你可以得到保证一个最接近<运营商 - 运算符重载是静态的,而且也没有限制一个类型参数,要求它的方式
This is the closest you can get to guaranteeing a "<" operator - overloaded operators are static, and there's no way of constraining a type argument to require it.
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