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允許方法將結果寫入參數；該方法必須在正常返回之前分配它。在泛型类型中，设置协方差。
請將此範例另存為 Example.cs，並與本頁其他範例分開執行。
Example.cs:
// PROJECT-EXAMPLE
if (int.TryParse("12", out int number))
System.Console.WriteLine(number);結果:
12
Method(out value) / interface IProducer<out T>using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
public static class Program
{
public static async Task Main(string[] args)
{
if (int.TryParse("42", out int number)) Console.WriteLine(number);
}
}using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
public static class Program
{
public static async Task Main(string[] args)
{
IProducer<string> text = new TextProducer();
IProducer<object> value = text;
Console.WriteLine(value.Create());
}
}
public interface IProducer<out T> { T Create(); }
public class TextProducer : IProducer<string> { public string Create() => "ore"; }官方來源：Microsoft學習。