[英]NewtonSoft Json serializer performance
我有一個要使用NewtonSoft Json.Net序列化到Json的對象。 對象相對較大,生成的Json約為300kb,但是序列化過程大約需要60秒。
要序列化的對象只是普通的POCO。
我正在使用的代碼是
string json = Newtonsoft.Json.JsonConvert.SerializeObject(data, Formatting.Indented);
有什么事情可以做以加快序列化,添加屬性等。
編輯:我剛剛用ServiceStack.Text Json序列化程序進行了測試,這需要48秒,仍然很慢。
[Serializable]
public class AppointmentItemViewModel
{
public AppointmentItemViewModel()
{
Data = new AppointmentData();
Statuses = new List<Status>();
ClosedDays = new List<ClosedDay>();
OpenHours = new List<OpenHours>();
}
public int CurrentDay { get; set; }
public int CurrentMonth { get; set; }
public int CurrentYear { get; set; }
public int Day { get; set; }
public int Month { get; set; }
public int Year { get; set; }
public int FirstHour { get; set; }
public int LastHour { get; set; }
public int CurrentHour { get; set; }
public int Step { get; set; }
public bool StaffOnlyBookOwn { get; set; }
public bool AllowPastAppointments { get; set; }
public bool AllowBlocks { get; set; }
public bool AllowGoogleCalendarSync { get; set; }
public long CurrentUser { get; set; }
public string DebugInfo { get; set; }
public bool HasResources { get; set; }
public string OrganisationId { get; set; }
public string DefaultTab { get; set; }
public string StartDay { get; set; }
public bool AppointmentBreaksOnWeek { get; set; }
public bool AppointmentBreaksOnMonth { get; set; }
public AppointmentData Data { get; set; }
public IEnumerable<Status> Statuses { get; set; }
public IEnumerable<LocationStaff> Staff { get; set; }
public IEnumerable<ClosedDay> ClosedDays { get; set; }
public IEnumerable<OpenHours> OpenHours { get; set; }
public IUserContext UserContext()
{
return ServiceLocator.Current.GetInstance<IUserContext>();
}
public override string ToString()
{
// Serialize the Json
var sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
using (JsonWriter writer = new JsonTextWriter(sw))
{
writer.WriteStartObject();
WriteProperty(writer, "CurrentDay", this.CurrentDay);
WriteProperty(writer, "CurrentMonth", this.CurrentMonth);
WriteProperty(writer, "CurrentYear", this.CurrentYear);
WriteProperty(writer, "Day", this.Day);
WriteProperty(writer, "Month", this.Month);
WriteProperty(writer, "Year", this.Year);
WriteProperty(writer, "FirstHour", this.FirstHour);
WriteProperty(writer, "LastHour", this.LastHour);
WriteProperty(writer, "CurrentHour", this.CurrentHour);
WriteProperty(writer, "Step", this.Step);
WriteProperty(writer, "StaffOnlyBookOwn", this.StaffOnlyBookOwn);
WriteProperty(writer, "AllowPastAppointments", this.AllowPastAppointments);
WriteProperty(writer, "AllowBlocks", this.AllowBlocks);
WriteProperty(writer, "AllowGoogleCalendarSync", this.AllowGoogleCalendarSync);
WriteProperty(writer, "CurrentUser", this.CurrentUser);
WriteProperty(writer, "HasResources", this.HasResources);
WriteProperty(writer, "OrganisationId", this.OrganisationId);
WriteProperty(writer, "DefaultTab", this.DefaultTab);
WriteProperty(writer, "StartDay", this.StartDay);
WriteProperty(writer, "AppointmentBreaksOnWeek", this.AppointmentBreaksOnWeek);
WriteProperty(writer, "AppointmentBreaksOnMonth", this.AppointmentBreaksOnMonth);
writer.WritePropertyName("Statuses");
writer.WriteStartArray();
foreach (var item in this.Statuses)
{
writer.WriteStartObject();
WriteProperty(writer, "Id", item.Id);
WriteProperty(writer, "Description", item.Description);
WriteProperty(writer, "Color", item.Color);
writer.WriteEndObject();
}
writer.WriteEndArray();
writer.WritePropertyName("Staff");
writer.WriteStartArray();
foreach (var item in this.Staff)
{
writer.WriteStartObject();
WriteProperty(writer, "Id", item.Id);
WriteProperty(writer, "Name", item.Name);
writer.WriteEndObject();
}
writer.WriteEndArray();
writer.WritePropertyName("ClosedDays");
writer.WriteStartArray();
foreach (var item in this.ClosedDays)
{
writer.WriteStartObject();
WriteProperty(writer, "Year", item.Year);
WriteProperty(writer, "Month", item.Month);
WriteProperty(writer, "Day", item.Day);
writer.WriteEndObject();
}
writer.WriteEndArray();
writer.WritePropertyName("OpenHours");
writer.WriteStartArray();
foreach (var item in this.OpenHours)
{
writer.WriteStartObject();
WriteProperty(writer, "DayOfWeek", item.DayOfWeek);
WriteProperty(writer, "OpenHour", item.OpenHour);
WriteProperty(writer, "CloseHour", item.CloseHour);
writer.WriteEndObject();
}
writer.WriteEndArray();
// Main data
writer.WritePropertyName("Data");
writer.WriteStartObject();
writer.WritePropertyName("Appointments");
writer.WriteStartArray();
foreach (var item in this.Data.Appointments)
{
writer.WriteStartObject();
WriteProperty(writer, "Id", item.Id);
WriteProperty(writer, "AppointmentId", item.AppointmentId);
WriteProperty(writer, "Year", item.Year);
WriteProperty(writer, "Month", item.Month);
WriteProperty(writer, "Day", item.Day);
WriteProperty(writer, "StartHour", item.StartHour);
WriteProperty(writer, "StartMinute", item.StartMinute);
WriteProperty(writer, "EndHour", item.EndHour);
WriteProperty(writer, "EndMinute", item.EndMinute);
WriteProperty(writer, "ResourceId", item.ResourceId);
WriteProperty(writer, "Description", item.Description);
WriteProperty(writer, "Status", item.Status);
WriteProperty(writer, "IsClass", item.IsClass);
WriteProperty(writer, "ProcessingLength", item.ProcessingLength);
WriteProperty(writer, "ClientId", item.ClientId);
WriteProperty(writer, "ClientName", item.ClientName);
WriteProperty(writer, "ClientPhone", item.ClientPhone);
WriteProperty(writer, "ClientNotes", item.ClientNotes);
WriteProperty(writer, "ClientHasMobile", item.ClientHasMobile);
WriteProperty(writer, "ClassFull", item.ClassFull);
WriteProperty(writer, "ClientWaiting", item.ClientWaiting);
WriteProperty(writer, "PromotionCode", item.PromotionCode);
WriteProperty(writer, "ArrivalNote", item.ArrivalNote);
WriteProperty(writer, "Labels", item.Labels);
WriteProperty(writer, "ReminderSent", item.ReminderSent);
WriteProperty(writer, "Cancelled", item.Cancelled);
writer.WritePropertyName("Items");
writer.WriteStartArray();
foreach (var appointmentItem in item.Items)
{
writer.WriteStartObject();
WriteProperty(writer, "Name", appointmentItem.Name);
WriteProperty(writer, "Length", appointmentItem.Length);
WriteProperty(writer, "ProcessingTime", appointmentItem.ProcessingTime);
WriteProperty(writer, "Resource", appointmentItem.Resource);
writer.WriteEndObject();
}
writer.WriteEndArray();
writer.WriteEndObject();
}
writer.WriteEndArray();
writer.WritePropertyName("Resources");
writer.WriteStartArray();
foreach (var item in this.Data.Resources)
{
writer.WriteStartObject();
WriteProperty(writer, "Id", item.Id);
WriteProperty(writer, "Name", item.Name);
WriteProperty(writer, "BlockLength", item.BlockLength);
WriteProperty(writer, "StartHour", item.StartHour);
WriteProperty(writer, "EndHour", item.EndHour);
writer.WritePropertyName("Breaks");
writer.WriteStartArray();
foreach (var breakItem in item.Breaks)
{
writer.WriteStartObject();
WriteProperty(writer, "Year", breakItem.Year);
WriteProperty(writer, "Month", breakItem.Month);
WriteProperty(writer, "Day", breakItem.Day);
WriteProperty(writer, "DayOfWeek", breakItem.DayOfWeek);
WriteProperty(writer, "StartHour", breakItem.StartHour);
WriteProperty(writer, "StartMinute", breakItem.StartMinute);
WriteProperty(writer, "Length", breakItem.Length);
WriteProperty(writer, "Description", breakItem.Description);
WriteProperty(writer, "OtherBreak", breakItem.OtherBreak);
WriteProperty(writer, "UserBreak", breakItem.UserBreak);
writer.WriteEndObject();
}
writer.WriteEndArray();
writer.WritePropertyName("OpenCloseBreaks");
writer.WriteStartArray();
foreach (var breakItem in item.OpenCloseBreaks)
{
writer.WriteStartObject();
WriteProperty(writer, "Year", breakItem.Year);
WriteProperty(writer, "Month", breakItem.Month);
WriteProperty(writer, "Day", breakItem.Day);
WriteProperty(writer, "DayOfWeek", breakItem.DayOfWeek);
WriteProperty(writer, "StartHour", breakItem.StartHour);
WriteProperty(writer, "StartMinute", breakItem.StartMinute);
WriteProperty(writer, "Length", breakItem.Length);
WriteProperty(writer, "Description", breakItem.Description);
WriteProperty(writer, "OtherBreak", breakItem.OtherBreak);
WriteProperty(writer, "UserBreak", breakItem.UserBreak);
writer.WriteEndObject();
}
writer.WriteEndArray();
writer.WriteEndObject();
}
writer.WriteEndArray();
writer.WriteEndObject();
}
return sb.ToString();
}
private void WriteProperty(JsonWriter writer, string name, object value)
{
writer.WritePropertyName(name);
if (value == null)
{
writer.WriteNull();
}
else
{
writer.WriteValue(value);
}
}
}
[Serializable]
public class AppointmentData
{
public IEnumerable<ExternalEvent> ExteralEvents { get; set; }
public IEnumerable<Appointment> Appointments { get; set; }
public IEnumerable<Resource> Resources { get; set; }
}
[Serializable]
public class ClosedDay
{
public int Year { get; set; }
public int Month { get; set; }
public int Day { get; set; }
}
[Serializable]
public class Appointment
{
public long Id { get; set; }
public long AppointmentId { get; set; }
public int Year { get; set; }
public int Month { get; set; }
public int Day { get; set; }
public int StartHour { get; set; }
public int StartMinute { get; set; }
public int EndHour { get; set; }
public int EndMinute { get; set; }
public long ResourceId { get; set; }
public string Description { get; set; }
public long Status { get; set; }
public bool IsClass { get; set; }
public int ProcessingLength { get; set; }
public long ClientId { get; set; }
public string ClientName { get; set; }
public string ClientPhone { get; set; }
public string ClientNotes { get; set; }
public bool ClientHasMobile { get; set; }
public bool ClassFull { get; set; }
public string ClientWaiting { get; set; }
public string PromotionCode { get; set; }
public string ArrivalNote { get; set; }
public string Labels { get; set; }
public bool ReminderSent { get; set; }
public bool Cancelled { get; set; }
public IEnumerable<AppointmentItems> Items { get; set; }
}
[Serializable]
public class AppointmentItems
{
public string Name { get; set; }
public int Length { get; set; }
public int ProcessingTime { get; set; }
public string Resource { get; set; }
}
[Serializable]
public class OpenHours
{
public int DayOfWeek { get; set; }
public int? OpenHour { get; set; }
public int? CloseHour { get; set; }
}
[Serializable]
public class Resource
{
public Resource()
{
Breaks = new List<ResourceBreak>();
Blocks = new List<ResourceBlock>();
OpenCloseBreaks = new List<ResourceBreak>();
}
public long Id { get; set; }
public string Name { get; set; }
public int BlockLength { get; set; }
public int StartHour { get; set; }
public int EndHour { get; set; }
public IEnumerable<ResourceBreak> Breaks { get; set; }
public IEnumerable<ResourceBlock> Blocks { get; set; }
public IEnumerable<ResourceBreak> OpenCloseBreaks { get; set; }
}
[Serializable]
public class ExternalEvent
{
public long Id { get; set; }
public int Year { get; set; }
public int Month { get; set; }
public int Day { get; set; }
public int DayOfWeek { get; set; }
public int StartHour { get; set; }
public int StartMinute { get; set; }
public int EndHour { get; set; }
public int EndMinute { get; set; }
public int Length { get; set; }
public string Description { get; set; }
}
[Serializable]
public class ResourceBreak
{
public int Year { get; set; }
public int Month { get; set; }
public int Day { get; set; }
public int DayOfWeek { get; set; }
public int StartHour { get; set; }
public int StartMinute { get; set; }
public int Length { get; set; }
public string Description { get; set; }
public bool OtherBreak { get; set; }
public bool UserBreak { get; set; }
}
[Serializable]
public class ResourceBlock
{
public int StartHour { get; set; }
public int StartMinute { get; set; }
public int Length { get; set; }
}
[Serializable]
public class Status
{
public long Id { get; set; }
public string Description { get; set; }
public int Color { get; set; }
}
[Serializable]
public class LocationStaff
{
public long Id { get; set; }
public string Name { get; set; }
}
您是否嘗試過使用JSON.NET將對象手動序列化為JSON? 當您擁有大量數據和許多屬性時,我發現它的速度要快得多。 下面是一個示例:
public static string Serialise(YourObject data)
{
StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
using (JsonWriter writer = new JsonTextWriter(sw))
{
writer.WriteStartObject();
writer.WritePropertyName("propertyName1");
if (data.Property1 == null)
{
writer.WriteNull();
}
else
{
writer.WriteValue(data.Property1);
}
writer.WritePropertyName("propertyName2");
writer.WriteStartArray();
foreach (var something in data.CollectionProperty)
{
writer.WriteStartObject();
writer.WritePropertyName("p1");
writer.WriteValue(something.prop1);
writer.WritePropertyName("p2");
writer.WriteValue(something.prop2);
writer.WritePropertyName("p3");
writer.WriteValue(something.prop3);
writer.WriteEndObject();
}
writer.WriteEndArray();
writer.WriteEndObject();
}
return sb.ToString();
}
這意味着需要做更多的工作,但是如果要達到目標,您將找不到更快的選擇。
您應該為喬恩·貝拉米(Jon Bellamy)給出答案的要點,但是這里有一些詳細信息:
我正在處理的項目也遇到了同樣的問題,我按照本頁上的建議解決了這個問題:
http://www.newtonsoft.com/json/help/html/Performance.htm
具體來說,他們建議在性能至關重要時手動序列化對象:
public static string ToJson(this Person p)
{
StringWriter sw = new StringWriter();
JsonTextWriter writer = new JsonTextWriter(sw);
// {
writer.WriteStartObject();
// "name" : "Jerry"
writer.WritePropertyName("name");
writer.WriteValue(p.Name);
// "likes": ["Comedy", "Superman"]
writer.WritePropertyName("likes");
writer.WriteStartArray();
foreach (string like in p.Likes)
{
writer.WriteValue(like);
}
writer.WriteEndArray();
// }
writer.WriteEndObject();
return sw.ToString();
}
我在VB中的示例如下所示:
Public Function SerializeWords(ByRef oWords As List(Of Word))
Dim sb As New StringBuilder
Dim sw As New IO.StringWriter(sb)
Using oWriter As Newtonsoft.Json.JsonWriter = New Newtonsoft.Json.JsonTextWriter(sw)
With oWriter
.WriteStartArray()
For Each oWord As Word In oWords
.WriteStartObject()
.WritePropertyName("ID")
.WriteValue(oWord.ID)
.WritePropertyName("Phonics")
.WriteValue(oWord.Phonics)
.WritePropertyName("Word_")
.WriteValue(oWord.Word_)
.WritePropertyName("WordLength")
.WriteValue(oWord.WordLength)
.WriteEndObject()
Next
.WriteEndArray()
End With
End Using
Return sb.ToString
End Function
注意這兩個函數是如何強類型化的。 我相信,當您使用Newtonsoft.Json.JsonConvert.SerializeObject()
它是使用反射來完成工作的(當您擁有許多具有許多屬性的對象時,這實際上可以累加起來)。
無論如何...一旦編寫了自己的序列化程序,我序列化250個“ Word”對象的列表的時間就從使用JsonConvert.SerializeObject()方法的28秒變為使用自己的函數的31毫秒。
這仍然使用了序列化器( 內部使用了反射 ),最終解決了我的速度問題+我不必手動輸入所有內容。我不知道JsonConvert.SerializeObject()
在內部是否不同於serializer.Serialize()
但我想我希望能對您有所幫助
StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
using(JsonWriter writer = new JsonTextWriter(sw))
{
var serializer = new JsonSerializer();
serializer.Serialize(writer, data);
}
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