具体是因为要写一个在Net Framework下运行的机器人，于是使用了4.6.1作为目标框架，并引用了nuget包（版本为2.1.5） <p dir="auto"

<a class="user-mention notranslate" data-hovercard-type="user" data-hovercard-url="/us

和我用的奇技淫巧有关, 我会考虑加个检查的 <div class="Box-

那就静候佳音咯XDMessage ID: ***@***.***>

在.Net Framework 4.6.1下使用本项目时会引发错误,about executor-cheng/mirai-csharp

Executor-Cheng commented on August 18, 2024 1

@dellbeat 久等了, 我用 System.Reflection.Emit 去调用 JsonDocument.GetRawdata 方法了, 交给JIT生成asm后就不用考虑平台差异了
更新至2.1.6即可
附性能测试结果:

|            Method |     Mean |   Error |  StdDev |  Gen 0 | Allocated |
|------------------ |---------:|--------:|--------:|-------:|----------:|
|        ParseByPtr | 589.4 ns | 2.52 ns | 2.36 ns | 0.0496 |     528 B |
| ParseByReflection | 754.6 ns | 2.96 ns | 2.62 ns | 0.0610 |     648 B |
|       ParseByEmit | 591.5 ns | 3.36 ns | 2.98 ns | 0.0496 |     528 B |

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Executor-Cheng commented on August 18, 2024

和我用的奇技淫巧有关, 我会考虑加个检查的

Mirai-CSharp/Mirai-CSharp.HttpApi/Utility/Utils.cs

Lines 25 to 65 in 430f2f4

    
           public static T Deserialize<T>(this JsonElement element, JsonSerializerOptions? options = null) 
        
           { 
        
               JsonDocument documentRef = Unsafe.As<JsonElement, JsonDocument>(ref element); 
        
               int idxPtr = Unsafe.AddByteOffset(ref Unsafe.As<JsonElement, int>(ref element), new IntPtr(IntPtr.Size)); 
        
               ReadOnlyMemory<byte> memory = GetRawdata(documentRef, idxPtr, true); 
        
               return JsonSerializer.Deserialize<T>(memory.Span, options)!; 
        
           } 
        
           private static readonly unsafe delegate*<JsonDocument, void*, int, bool, ref ReadOnlyMemory<byte>> _jsonDocumentGetRawdataWinPtr; 
        
           //                                            ^          ^     ^     ^            ^ 
        
           //                                            |          |     |     |            \-- ret 
        
           //                                            |          |     |     \-- includeQuotes 
        
           //                                            |          |     \-- idx 
        
           //                                            \-- this   \-- &this 
        
           // 751.1ns -> 577.1ns (-174ns, 76.83%) Alloc: -120B per invocation, this = JsonDocument 
        
           // (调用实例方法, 且不用什么MethodInfo.Invoke, 还有什么Delegate。不同方法会有不同的参数列表, 请结合实际)  
        
           private static readonly unsafe delegate*<JsonDocument, int, bool, ReadOnlyMemory<byte>> _jsonDocumentGetRawdataUnixPtr; 
        
           //                                            ^          ^     ^            ^ 
        
           //                                            |          |     |            \-- ret 
        
           //                                            |          |     \-- includeQuotes 
        
           //                                            |          \-- idx 
        
           //                                            \-- this 
        
           // this = JsonDocument 
        
           static unsafe Utils() 
        
           { 
        
               IntPtr methodPtr = (IntPtr)typeof(Delegate).GetField("_methodPtr", BindingFlags.NonPublic | BindingFlags.Instance)!.GetValue(typeof(JsonDocument).GetMethod("GetRawValue", BindingFlags.NonPublic | BindingFlags.Instance)!.CreateDelegate(typeof(Func<int, bool, ReadOnlyMemory<byte>>), null))!; 
        
               _jsonDocumentGetRawdataWinPtr = (delegate*<JsonDocument, void*, int, bool, ref ReadOnlyMemory<byte>>)methodPtr; 
        
               _jsonDocumentGetRawdataUnixPtr = (delegate*<JsonDocument, int, bool, ReadOnlyMemory<byte>>)methodPtr; 
        
           } 
        
           [MethodImpl(MethodImplOptions.NoInlining)] 
        
           private static unsafe ReadOnlyMemory<byte> GetRawdata(JsonDocument j, int idx, bool includeQuotes) 
        
           { 
        
               if (Environment.OSVersion.Platform == PlatformID.Win32NT) 
        
               { 
        
                   return _jsonDocumentGetRawdataWinPtr(j, Unsafe.AsPointer(ref j), idx, includeQuotes); 
        
               } 
        
               return _jsonDocumentGetRawdataUnixPtr(j, idx, includeQuotes); 
        
           }

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dellbeat commented on August 18, 2024

邮件已收到

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dellbeat commented on August 18, 2024

那就静候佳音咯XD Message ID: ***@***.***>

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Executor-Cheng commented on August 18, 2024

人有点晕, 找了半天没找到有什么黑科技能更加安全地调用 ReadOnlyMemory<byte> JsonDocument.GetRawValue(int, bool) 这个非公共方法的, 等我继续钻研一下
期间你可以把这一段改成下边这个凑合着用用

Mirai-CSharp/Mirai-CSharp.HttpApi/Utility/Utils.cs

Lines 25 to 31 in 430f2f4

    
           public static T Deserialize<T>(this JsonElement element, JsonSerializerOptions? options = null) 
        
           { 
        
               JsonDocument documentRef = Unsafe.As<JsonElement, JsonDocument>(ref element); 
        
               int idxPtr = Unsafe.AddByteOffset(ref Unsafe.As<JsonElement, int>(ref element), new IntPtr(IntPtr.Size)); 
        
               ReadOnlyMemory<byte> memory = GetRawdata(documentRef, idxPtr, true); 
        
               return JsonSerializer.Deserialize<T>(memory.Span, options)!; 
        
           }

private static readonly MethodInfo _method = typeof(JsonDocument).GetMethod("GetRawValue", BindingFlags.NonPublic | BindingFlags.Instance)!;

public static T Deserialize<T>(this JsonElement element, JsonSerializerOptions? options = null)
{
    JsonDocument documentRef = Unsafe.As<JsonElement, JsonDocument>(ref element);
    int idx = Unsafe.AddByteOffset(ref Unsafe.As<JsonElement, int>(ref element), new IntPtr(IntPtr.Size));
    ReadOnlyMemory<byte> memory = (ReadOnlyMemory<byte>)_method.Invoke(documentRef, new object[] { idx, true })!;
    return JsonSerializer.Deserialize<T>(memory.Span)!;
}

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dellbeat commented on August 18, 2024

那大佬先钻研着
我这边收消息之前用自制ws先混过去了XD

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dellbeat commented on August 18, 2024

邮件已收到

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在.Net Framework 4.6.1下使用本项目时会引发错误 about mirai-csharp HOT 7 CLOSED

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	public static T Deserialize<T>(this JsonElement element, JsonSerializerOptions? options = null)
	{
	JsonDocument documentRef = Unsafe.As<JsonElement, JsonDocument>(ref element);
	int idxPtr = Unsafe.AddByteOffset(ref Unsafe.As<JsonElement, int>(ref element), new IntPtr(IntPtr.Size));
	ReadOnlyMemory<byte> memory = GetRawdata(documentRef, idxPtr, true);
	return JsonSerializer.Deserialize<T>(memory.Span, options)!;
	}

	private static readonly unsafe delegate<JsonDocument, void, int, bool, ref ReadOnlyMemory<byte>> _jsonDocumentGetRawdataWinPtr;
	// ^ ^ ^ ^ ^
	// \| \| \| \| \-- ret
	// \| \| \| \-- includeQuotes
	// \| \| \-- idx
	// \-- this \-- &this
	// 751.1ns -> 577.1ns (-174ns, 76.83%) Alloc: -120B per invocation, this = JsonDocument
	// (调用实例方法, 且不用什么MethodInfo.Invoke, 还有什么Delegate。不同方法会有不同的参数列表, 请结合实际)

	private static readonly unsafe delegate*<JsonDocument, int, bool, ReadOnlyMemory<byte>> _jsonDocumentGetRawdataUnixPtr;
	// ^ ^ ^ ^
	// \| \| \| \-- ret
	// \| \| \-- includeQuotes
	// \| \-- idx
	// \-- this
	// this = JsonDocument

	static unsafe Utils()
	{
	IntPtr methodPtr = (IntPtr)typeof(Delegate).GetField("_methodPtr", BindingFlags.NonPublic \| BindingFlags.Instance)!.GetValue(typeof(JsonDocument).GetMethod("GetRawValue", BindingFlags.NonPublic \| BindingFlags.Instance)!.CreateDelegate(typeof(Func<int, bool, ReadOnlyMemory<byte>>), null))!;
	_jsonDocumentGetRawdataWinPtr = (delegate<JsonDocument, void, int, bool, ref ReadOnlyMemory<byte>>)methodPtr;
	_jsonDocumentGetRawdataUnixPtr = (delegate*<JsonDocument, int, bool, ReadOnlyMemory<byte>>)methodPtr;
	}

	[MethodImpl(MethodImplOptions.NoInlining)]
	private static unsafe ReadOnlyMemory<byte> GetRawdata(JsonDocument j, int idx, bool includeQuotes)
	{
	if (Environment.OSVersion.Platform == PlatformID.Win32NT)
	{
	return _jsonDocumentGetRawdataWinPtr(j, Unsafe.AsPointer(ref j), idx, includeQuotes);
	}
	return _jsonDocumentGetRawdataUnixPtr(j, idx, includeQuotes);
	}