推荐订阅源

Get Value by Key

• GetValueOrDefault

.net core

• TryGetValue

fx

GetValueOrDefault

Dictionary<string, string> m_kbd = new Dictionary<string, string>();
result += m_kbd.GetValueOrDefault(kbd.Key);

TryGetValue

Dictionary<string, string> m_kbd = new Dictionary<string, string>();
result += m_kbd.TryGetValue(kbd.Key, out var value)? value : null;

Get an integer from a string

• TryParse

TryParse

string itostr(string val)
{
    string result = "";
    int iVal = 0;

    if (Int32.TryParse(val, out iVal))
    {
        val = "_" + iVal;
    }

    result = val;

    return result;
}

Ref

• The history of C#
• GetValueOrDefault available for IReadOnlyDictionary but not IDictionary
• C# System.Collections.Generic cannot use GetValueOrDefault method