ASP.NET MVC 4 WebAPI (beta) - 如何更改最大响应缓冲区大小答案

【问题标题】：ASP.NET MVC 4 WebAPI (beta) - how to change maximum response buffer sizeASP.NET MVC 4 WebAPI (beta) - 如何更改最大响应缓冲区大小
【发布时间】：2012-05-03 17:19:29
【问题描述】：

在 ASP.NET MVC 4.0 WebAPI（测试版）中，我返回了一个序列化为大于 65kb 的 JSON 的对象。从下面的堆栈跟踪中可以看出，框架正在抛出异常，因为这超出了一些内部限制。

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。有人可以帮忙吗？

谢谢

【问题讨论】：

你试过了吗：forums.asp.net/t/1795106.aspx/1?Set+length+of+web+response
@syneptody 我没有使用默认的 json 序列化程序，所以我不确定这是否适用。无论如何，感谢您的链接，将根据其建议提供一个小提琴。
你能把你JsonNetFormatter类的相关部分贴出来吗？
@nemesv pastebin.com/6Ld6srLH
如何调用你的 webapi 方法？浏览器、javascript、自定义客户端？

标签： asp.net asp.net-web-api

【解决方案1】：

根据夜间源代码构建发布的 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 beta 安装程序），问题应该会消失。

无论这个问题如何，我都建议切换，因为有相当多的重大更改，并且您现在正在构建的任何内容保证不会与最终版本一起工作。

【讨论】：

谢谢 - 看来这就是我要做的，唉。
切换有效吗？我看到了完全相同的堆栈跟踪，但据我所知，我没有使用任何 beta 版本。