C# 如何按键查找/检查字典值
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How to lookup / check a dictionary value by key
提问by user1559618
I am trying to confirm whether a specific dictionary key contains a value
我正在尝试确认特定字典键是否包含值
e.g.
例如
does dict01 contain the phrase "testing" in the "tester" key
dict01 是否在“tester”键中包含短语“testing”
At the moment I am having to iterate through the dictionary using KeyPair, which I don't want to have to do as it wasting performance
目前我不得不使用 KeyPair 遍历字典，我不想这样做，因为它会浪费性能
采纳答案by Zbigniew
You can use ContainsKeyand string.Contains:
您可以使用ContainsKey和string.Contains：
var key = "tester";
var val = "testing";
if(myDictionary.ContainsKey(key) && myDictionary[key].Contains(val))
{
// "tester" key exists and contains "testing" value
}
You can also use TryGetValue:
您还可以使用TryGetValue：
var key = "tester";
var val = "testing";
var dicVal = string.Empty;
if(myDictionary.TryGetValue(key, out dicVal) && dicVal.contains(val))
{
// "tester" key exists and contains "testing" value
}
回答by Shai
回答by M. Mennan Kara
You can use the following method if you don't want to iterate through the dictionary twice
如果不想遍历字典两次，可以使用以下方法
string value;
var result = dict01.TryGetValue("tester", out value) && value.Contains("testing");
