判断Dictionary Key是否存在

参考链接:https://blog.csdn.net/zdyueguanyun/article/details/51392477

if(Dictionary.ContainsKey(key))
{
   //已存在key
}

偏方:仅供参考,不推荐使用
参考链接:https://blog.csdn.net/a_dev/article/details/79931353

key:需要判断的Key

if (Dictionary.Keys.Any() = (e) => { 0 == string.Compare(e,key); })
{
}

string sValue = "";
if (Dictionary.TryGetValue(key, out sValue))
{
}