[英]Iterating through a Dictionary and adding a value to every dictionary value
我想在字典中的每个值上加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;
}
这是完整的错误消息:
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;
}
尝试:
foreach (int x in dict.Keys.ToList()) {
dict[x] += 1;
}
因为字典因更改(以及其内部迭代器)而失效。
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