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C# 拡張メソッド(メソッドチェーン)

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/// <summary>
/// 文字列を数字に変換する
/// 文字列に数字以外が入っていたら null を返す
/// </summary>
/// <param name="message">数字の文字列</param>
/// <returns>文字列が数字であればその値を int で返す そうでなければ null を返す</returns>
public static int? ToInt(this string message)
{
    return int.TryParse(message, out var result) ? result : null;
}
//------別のScript
void Start(){
    string message = "123456";
    var num1 = message.ToInt();
    Debug.Log(num1);//123456
    message = "1234a";
    var num2 = message.ToInt();
    Debug.Log(num2);//null
}
public static int? ToInt(this string message)

引数でthisをつけることで拡張メソッドとして扱うことができる

/// <summary>
/// int型の数値にint型の引数を掛けた値をセットする
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
public static void Mul(this ref int x,int y)
{
    x = x * y;
}
//------別のScript
void Start(){
    int i = 2;
    i.Mul(4);
    Debug.Log(i);//8
}
public static void Mul(this ref int x,int y)

引数を2つ以上つけることもできる

拡張メソッド

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