如何修改KeyValuePair值？

I got a problem when I try to modify the value of an item because its only a read only field.

当我尝试修改项目的值时，我遇到了一个问题，因为它只是一个只读字段。

KeyValuePair<Tkey, Tvalue>

I've tried different alternatives like:

我尝试了不同的替代方案，如：

Dictionary<Tkey, Tvalue>

but there I have the same problem. Is there a way to set the value field to an new value?

但我有同样的问题。有没有办法将值字段设置为新值？

3 个解决方案

#1

You can't modify it, you can replace it with a new one.

您无法修改它，您可以用新的替换它。

var newEntry = new KeyValuePair<Tkey, Tvalue>(oldEntry.Key, newValue);

or for dictionary:

或者字典：

dictionary[oldEntry.Key] = newValue;

#2

KeyValuePair<TKey, TValue> is immutable. You need to create a new one with the modifified key or value. What you actually do next depends on your scenario, and what exactly you want to do...

KeyValuePair 是不可变的。您需要使用修改后的键或值创建一个新的。你下一步做什么取决于你的情景，你究竟想做什么...... ，tvalue>

#3

Here, if you want to make KeyValuePair mutable.

在这里，如果你想让KeyValuePair变得可变。

Make a custom class.

制作自定义课程。

public class KeyVal<Key, Val>
{
    public Key Id { get; set; }
    public Val Text { get; set; }

    public KeyVal() { }

    public KeyVal(Key key, Val val)
    {
        this.Id = key;
        this.Text = val;
    }
}

so we can make it use in wherever in KeyValuePair.

所以我们可以在KeyValuePair的任何地方使用它。

#1