C# Cheat Sheet

将object类型参数转成泛型T

用Convert.ChangeType

1	var a = (T) Convert.ChangeType(_arg, typeof(T));

比如分析Lua出入的参数时候,参数列表中的参数类型为object,但是回传给分析函数时候,回传参数类型为T

/// <summary>
/// 将给定参数从Index开始,按两个一组进行拆分回调. 用于和Lua交互时候对传参进行分析
/// </summary>
/// <param name="_startIndex">开始的Index</param>
/// <param name="_args">参数列表</param>
/// <param name="_callBack">回调函数</param>
/// <typeparam name="A">参数1的泛型</typeparam>
/// <typeparam name="B">参数2的泛型</typeparam>
public static void AnyliseParams<A, B>(int _startIndex, object[] _args, Action<A, B> _callBack)
{
    var length = _args.Length;
    if (_startIndex < 0 || _startIndex >= length || length == 0
        || (length - _startIndex) % 2 != 0)
    {
        //传入的参数不合法
        Debug.LogError("rGDIaQ2H");
        return;
    }

    var nowIndex = _startIndex;
    while (nowIndex < length)
    {
        var a = (A) Convert.ChangeType(_args[nowIndex], typeof(A));
        var b = (B) Convert.ChangeType(_args[nowIndex + 1], typeof(B));
        _callBack(a, b);
        nowIndex += 2;
    }
}

UnityEngine.Object != 不能替换 ?.

mCurrentMesh?.Clear();

if (mCurrentMesh != null)
{
    mCurrentMesh.Clear();
}

上面两个判断 不相等

?. on a type deriving from UnityEngine.Object bypasses the lifetime check on the underlying Unity engine object.

原因在这个帖子里面有说明.

主要是 Unity的Object 内部重载了 null 判等, 会去检查对象是否被 GameObject.Destory(*)了 , 也就是内存在,但是引擎中被销毁. 那样也认为null了

string前面的@符号

Link

It marks the string as a verbatim string literal - anything in the string that would normally be interpreted as an escape sequence is ignored.

So “C:\Users\Rich” is the same as @”C:\Users\Rich”

There is one exception: an escape sequence is needed for the double quote. To escape a double quote, you need to put two double quotes in a row. For instance, @”””” evaluates to “.

也就是不用转译了,一般正则用