c# - 遍历字典并为每个字典值添加一个值

Question

我想为字典中的每个值加 1。

产生“InvalidOperationException:不同步”

    public Dictionary<int,int> dict = new Dictionary<int,int>();
    dict.Add (23, 34);

foreach (KeyValuePair<int,int> kvp in dict) {
        dict [kvp.Key] += 1;
    }

完整的错误信息如下:

System.Collections.Generic.Dictionary`2+Enumerator[System.Int32,System.Int32].VerifyState () (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:912)
System.Collections.Generic.Dictionary`2+Enumerator[System.Int32,System.Int32].MoveNext () (at /Users/builduser/buildslave/mono/build/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:835)

这种尝试给出了类似的结果:

foreach (int x in dict.Keys) {
            kek [x] += 1;
        }

Answer 1

尝试:

foreach (int x in dict.Keys.ToList()) {
    dict[x] += 1;
}

因为字典在对它的更改时失效(因此它的内部迭代器也是如此)。