c# - 将值分配给字典数组会覆盖现有值

Question

我有以下代码：

Dictionary<string, string>[] Records = new Dictionary<string, string>[2];         
Dictionary<string, string> newFields = new Dictionary<string, string>();

newFields["Item"] = "M1";
newFields["Value"] = "V1";

Records[0] = newFields;

newFields["Item"] = "M2"; // This also changes values in Records[0]
newFields["Value"] = "V2";

Records[1] = newFields;

但是，一旦我再次分配 newFields，它也会更改 Records[0] 中的值??????????????

Answer 1

这是因为您引用了newFieldsto Records[0]！

试试这个：

/* .... */

Records[0] = new Dictionary<string, string>(newFields);

/* .... */

Answer 2

Records[0] = newFields;传递参考，而不是该字典的副本。这就是为什么两者都Records[0]指向newFields同一个对象。

要复制现有Dictionary实例，请使用：

Records[0] = new Dictionary<string, string>(newFields);