ASP.NET MVC 4 Web API(测试版)-如何更改最大响应缓冲区大小

Question

在 ASP.NET MVC 4.0 WebAPI(测试版)中，我返回一个序列化为大于 65kb 的 JSON 的对象。正如您从下面的堆栈跟踪中看到的那样，框架正在抛出异常，因为这超出了某些内部限制。

System.Net.Http.HttpRequestException: Cannot write more bytes to the buffer than the configured maximum buffer size: 65536.
   at System.Net.Http.HttpContent.LimitMemoryStream.CheckSize(Int32 countToAdd)
   at System.Net.Http.HttpContent.LimitMemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count)
   at System.IO.StreamWriter.Flush(Boolean flushStream, Boolean flushEncoder)
   at System.IO.StreamWriter.Write(Char value)
   at Newtonsoft.Json.JsonWriter.AutoComplete(JsonToken tokenBeingWritten) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\JsonWriter.cs:line 634
   at Newtonsoft.Json.JsonTextWriter.WritePropertyName(String name) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\JsonTextWriter.cs:line 204
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.WriteMemberInfoProperty(JsonWriter writer, Object memberValue, JsonProperty property, JsonContract contract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 209
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContract collectionValueContract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 336
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.WriteMemberInfoProperty(JsonWriter writer, Object memberValue, JsonProperty property, JsonContract contract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 209
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContract collectionValueContract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 336
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IWrappedCollection values, JsonArrayContract contract, JsonProperty member, JsonContract collectionValueContract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 445
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.WriteMemberInfoProperty(JsonWriter writer, Object memberValue, JsonProperty property, JsonContract contract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 209
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContract collectionValueContract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 336
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.WriteMemberInfoProperty(JsonWriter writer, Object memberValue, JsonProperty property, JsonContract contract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 209
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeObject(JsonWriter writer, Object value, JsonObjectContract contract, JsonProperty member, JsonContract collectionValueContract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 336
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.SerializeList(JsonWriter writer, IWrappedCollection values, JsonArrayContract contract, JsonProperty member, JsonContract collectionValueContract) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 445
   at Newtonsoft.Json.Serialization.JsonSerializerInternalWriter.Serialize(JsonWriter jsonWriter, Object value) in d:\Development\Releases\Json\Working\Src\Newtonsoft.Json\Serialization\JsonSerializerInternalWriter.cs:line 59
   at xxx.Api.JsonNetFormatter.<>c__DisplayClass5.<OnWriteToStreamAsync>b__4() in c:\xxx\xxx\xxx.Api\JsonNetFormatter.cs:line 79
   at System.Threading.Tasks.Task.Execute()

我找不到任何方法来更改此默认设置。任何人都可以帮忙吗？

谢谢

Answer 1

根据每晚源代码构建发布的 System.Net.Http.dll，最大缓冲区大小的值在 HttpContent 中定义为:

internal const long MaxBufferSize = 0x7fffffffL; // 2147483647

因此，如果您切换到新版本(而不是测试版安装程序)，问题应该会消失。

我建议不管这个问题还是切换，因为有 相当多的重大变化 并且您现在正在构建的任何内容都保证不适用于最终版本。