【翻译】发布 .NET 8 Preview 1开发者社区

【翻译】发布 .NET 8 Preview 1

<TargetFramework>net8.0</TargetFramework>

	.NET 7	.NET 8 预览版 1
Linux x64 (使用 -p:StripSymbols=true)	3.76 MB	1.84 MB
Windows x64	2.85 MB	1.77 MB

USER app

YourType[] trainingData = LoadTrainingData();
Random.Shared.Shuffle(trainingData);
IDataView sourceData = mlContext.Data.LoadFromEnumerable(trainingData);
DataOperationsCatalog.TrainTestData split = mlContext.Data.TrainTestSplit(sourceData);
model = chain.Fit(split.TrainSet);
IDataView predictions = model.Transform(split.TestSet);
...

private static ReadOnlySpan<Button> s_allButtons = new[]
    Button.Red,
    Button.Green,
    Button.Blue,
    Button.Yellow,
Button[] thisRound = Random.Shared.GetItems(s_allButtons, 31);
// rest of game goes here ...

JsonSerializer.Deserialize<MyPoco>("""{"Id" : 42, "AnotherId" : -1 }"""); 
// JsonException : The JSON property 'AnotherId' could not be mapped to any .NET member contained in type 'MyPoco'.
[JsonUnmappedMemberHandling(JsonUnmappedMemberHandling.Disallow)]
public class MyPoco
   public int Id { get; set; }
}

IDerived value = new Derived { Base = 0, Derived =1 };
JsonSerializer.Serialize(value); // {"Base":0,"Derived":1}
public interface IBase
  public int Base { get; set; }
public interface IDerived : IBase
  public int Derived { get; set; }
public class Derived : IDerived
  public int Base { get; set; }
  public int Derived { get; set; }
}

var options = new JsonSerializerOptions { PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower };
JsonSerializer.Serialize(new { PropertyName = "value" }, options); // { "property_name" : "value" }

namespace System.Text.Json;
public class JsonNamingPolicy
  public static JsonNamingPolicy CamelCase { get; }
  public static JsonNamingPolicy KebabCaseLower { get; }
  public static JsonNamingPolicy KebabCaseUpper { get; }
  public static JsonNamingPolicy SnakeCaseLower { get; }
  public static JsonNamingPolicy SnakeCaseUpper { get; }
}

public class MySerializer
  private JsonSerializerOptions Options { get; }
  public MySerializer()
        Options = new JsonSerializerOptions(JsonSerializerDefaults.Web) { Converters = { new MyCustomConverter() } };
        Options.MakeReadOnly(); // 在暴露属性之前将其设为只读。
}

private static readonly FrozenDictionary<string, bool> s_configurationData =
    LoadConfigurationData().ToFrozenDictionary(optimizeForReads: true);
if (s_configurationData.TryGetValue(key, out bool setting) && setting)
    Process();
}

private static readonly char[] s_chars = "-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz".ToCharArray();
int i = str.IndexOfAny(s_chars);

private static readonly IndexOfAnyValues<char> s_chars = IndexOfAnyValues.Create("-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz");
int i = str.AsSpan().IndexOfAny(s_chars);

static string GetMessage(int min, int max) =>
    string.Format(CultureInfo.InvariantCulture, "Range from {0} to {1}", min, max);

static string GetMessage(int min, int max) =>
    string.Create(CultureInfo.InvariantCulture, $"Range from {min} to {max}");

private static readonly CompositeFormat s_rangeMessage = CompositeFormat.Parse(LoadRangeMessageResource());
static string GetMessage(int min, int max) =>
    string.Format(CultureInfo.InvariantCulture, s_rangeMessage, min, max);

/app# dotnet new console
/app# dotnet build
app -> /app/bin/Debug/net8.0/app.dll
/app# dotnet publish
app -> /app/bin/Release/net8.0/app.dll
app -> /app/bin/Release/net8.0/publish/
/app# dotnet publish -p:PublishRelease=false
app -> /app/bin/Debug/net8.0/app.dll
app -> /app/bin/Debug/net8.0/publish/

【翻译】发布 .NET 8 Preview 1

【翻译】发布 .NET 8 Preview 1

欢迎使用 .NET 8

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目标 .NET 8

.NET 8 预览版 1 中的新功能

原生 AOT

.NET 容器镜像

运行时和库

用于处理随机性的实用方法

System.Numerics 和 System.Runtime.Intrinsics

JSON 改进

新的性能优化类型在核心库中

.NET SDK

dotnet publish 和 dotnet pack 默认生成Release资产