c# - How to set dictionary values to null

Question

I'm wondering if there is a way to put all dictionary values to null (or each elements) ? Because we can't iterate on it if the values has been changed to null.

(I've searched on Stackoverflow before asking this simple question but I didn't find a clear response on this issue).

Regards

Answer 1

这是你想要的吗？

foreach(var key in dict.Keys.ToList())
    dict[key] = null;

重要提示：调用ToList(). 这会将密钥复制到临时列表中。否则，您将收到一条InvalidOperationException消息：

收藏已修改；枚举操作可能无法执行。