如果目标数组为或长度为0，则直接返回offset的值
public static int IndexOfFirst(
this ReadOnlySpan<byte> srcByteArray,
int offset,
int length,
byte[] subByteArray
)<ExtensionAttribute>
Public Shared Function IndexOfFirst (
srcByteArray As ReadOnlySpan(Of Byte),
offset As Integer,
length As Integer,
subByteArray As Byte()
) As Integer[<ExtensionAttribute>]
static member IndexOfFirst :
srcByteArray : ReadOnlySpan<byte> *
offset : int *
length : int *
subByteArray : byte[] -> int [缺少 "M:TouchSocket.Core.SystemExtension.IndexOfFirst(System.ReadOnlySpan{System.Byte},System.Int32,System.Int32,System.Byte[])" 的 <returns> 文档]