Birden çok hedefleme

Kavram ve faydalar

Varlık seçiminin temelleri

Koşullu derleme gösterimi

#define NET45   // simulate building for different targets
// #define NETSTANDARD2_0

using System;

public class Program
{
  public static void Main(string[] args)
  {
    Console.WriteLine("Target: " + TargetName());
  }

  // Public API: stays the same across targets
  public static string TargetName()
  {
#if NET45
    return "net45 build";
#elif NETSTANDARD2_0
    return "netstandard2.0 build";
#else
    return "unknown target";
#endif
  }
}

Kararlı API, dahili uyarlamalar

#define NET45

using System;
using System.IO;

public class Program
{
  // Public API is stable; internal implementation differs.
  public static string ReadAllTextCompat(string path)
  {
#if NET45
    // net45 has File.ReadAllText; use it directly.
    return File.ReadAllText(path);
#else
    // Example shim path (for an older TF that lacks some helper API)
    using (var fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read))
    using (var sr = new StreamReader(fs))
    {
      return sr.ReadToEnd();
    }
#endif
  }

  public static void Main(string[] args)
  {
    // For demo, write then read
    string p = "demo.txt";
    File.WriteAllText(p, "hello");
    Console.WriteLine(ReadAllTextCompat(p));
  }
}

Kurulum ipuçları

Yaygın tuzaklar

Birden çok hedef neden kullanılır?

Özet