[C#] ref 和 out 差異

MVA Twenty C# Questions Explained - [​10 What is the difference between ref and out keywords?]

影片內容說明兩者最大差異在於 ref 參數必須先初始化，而 out 參數不需要

MVA 範例：說明 ref 和 out 都是 ByRef

static void Main(string[] args)
{
    string outString = "This is the original outString";
    Console.WriteLine(outString);
    outMethod(out outString);
    Console.WriteLine(outString);

    string refString = "This is the original ref string";
    Console.WriteLine(refString);
    refMethod(ref refString);
    Console.WriteLine(refString);
}

static void outMethod(out string outString)
{
    outString = "This is the new outString value";
}

static void refMethod(ref string refString)
{
    refString = "This is the new refString value";
}

參考資料
• 使用 ref 和 out 傳遞陣列
• [.NET]方法參數關鍵字：ref與out的比較
• C# ref／out 關鍵字與傳遞參考型別參數