C# 将数据库查询/自定义类转换为JSON?
我的应用程序中有一个jquery事件日历,它必须由JSON输入提供。 此时输入看起来如下所示:C# 将数据库查询/自定义类转换为JSON?,c#,.net,json,converter,C#,.net,Json,Converter,我的应用程序中有一个jquery事件日历,它必须由JSON输入提供。 此时输入看起来如下所示: [ { "date": "1352636408000", "type": "meeting", "title": "Poker Freak", "description": "Lorem Ipsum dolor set", "url": "http://www.event1.com/" }, { "date": "1351775676000", "type": "demo", "titl
[
{ "date": "1352636408000", "type": "meeting", "title": "Poker Freak", "description": "Lorem Ipsum dolor set", "url": "http://www.event1.com/" },
{ "date": "1351775676000", "type": "demo", "title": "Poker Freak", "description": "Lorem ipsum dolor sit amet, cveniris nisi ut aliquip ex ea commodo consequat.", "url": "http://www.event2.com/" },
{ "date": "1351764876000", "type": "meeting", "title": "Poker Freak", "description": "Lorem Ipsum dolor set", "url": "http://www.event3.com/" } ]
它保存在一个JSON文件中,该文件是来自事件日历的演示文件
另一方面,我有一个MSSQL表,它将事件表Date中的数据内容设置为DateTime,键入为string等等
我使用以下命令获取数据:
public static List<Event> GetAllEvents()
{
using (CyberDBDataContext db = new CyberDBDataContext())
{
return (from a in db.Events select a).ToList();
}
}
现在-如何将MSSQL返回查询事件列表转换为JSON?您应该使用该库。这将是最简单的方法,在我看来,它是JSON最好的库之一
使用这些示例中的第二个和第四个格式
string defaultJson = JsonConvert.SerializeObject(entry);
// {"Details":"Application started.","LogDate":"\/Date(1234656000000)\/"}
string javascriptJson = JsonConvert.SerializeObject(entry, new JavaScriptDateTimeConverter());
// {"Details":"Application started.","LogDate":new Date(1234656000000)}
string isoJson = JsonConvert.SerializeObject(entry, new IsoDateTimeConverter());
// {"Details":"Application started.","LogDate":"2009-02-15T00:00:00Z"}
string isoJson = JsonConvert.SerializeObject(entry, new TicksDateTimeConverter());
// {"Details":"Application started.","LogDate":"1234656000000"}
使用自定义DateFormatter跟踪您的代码段:
public static string GetAllEvents()
{
using (CyberDBDataContext db = new CyberDBDataContext())
{
return JsonConvert.SerializeObject((from a in db.Events select a).ToList(), new TicksDateTimeConverter());
}
}
编辑:如果您使用的是ASP.net MVC
不知道它是否也适用于ASP.net MVC4之前的任何版本,但因为版本4 JSON.net是默认的JSON序列化程序。所以你不需要再去实现它了
自定义转换器
我建议您实现如下自定义转换器。基本上,它与JavaScript转换器相同,但应该只返回刻度
using System;
using System.Globalization;
using Newtonsoft.Json.Utilities;
namespace Newtonsoft.Json.Converters
{
/// <summary>
/// Converts a <see cref="DateTime"/> to and from a JavaScript date constructor (e.g. new Date(52231943)).
/// </summary>
public class TicksDateTimeConverter : DateTimeConverterBase
{
/// <summary>
/// Writes the JSON representation of the object.
/// </summary>
/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
/// <param name="value">The value.</param>
/// <param name="serializer">The calling serializer.</param>
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
long ticks;
if (value is DateTime)
{
DateTime dateTime = (DateTime)value;
DateTime utcDateTime = dateTime.ToUniversalTime();
ticks = JsonConvert.ConvertDateTimeToJavaScriptTicks(utcDateTime);
}
#if !PocketPC && !NET20
else if (value is DateTimeOffset)
{
DateTimeOffset dateTimeOffset = (DateTimeOffset)value;
DateTimeOffset utcDateTimeOffset = dateTimeOffset.ToUniversalTime();
ticks = JsonConvert.ConvertDateTimeToJavaScriptTicks(utcDateTimeOffset.UtcDateTime);
}
#endif
else
{
throw new Exception("Expected date object value.");
}
writer.WriteValue(ticks);
}
/// <summary>
/// Reads the JSON representation of the object.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
/// <param name="objectType">Type of the object.</param>
/// <param name="existingValue">The existing property value of the JSON that is being converted.</param>
/// <param name="serializer">The calling serializer.</param>
/// <returns>The object value.</returns>
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
Type t = (ReflectionUtils.IsNullableType(objectType))
? Nullable.GetUnderlyingType(objectType)
: objectType;
if (reader.TokenType == JsonToken.Null)
{
if (!ReflectionUtils.IsNullableType(objectType))
throw new Exception("Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
return null;
}
if (reader.TokenType != JsonToken.StartConstructor || !string.Equals(reader.Value.ToString(), "Date", StringComparison.Ordinal))
throw new Exception("Unexpected token or value when parsing date. Token: {0}, Value: {1}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType, reader.Value));
reader.Read();
if (reader.TokenType != JsonToken.Integer)
throw new Exception("Unexpected token parsing date. Expected Integer, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
long ticks = (long)reader.Value;
DateTime d = JsonConvert.ConvertJavaScriptTicksToDateTime(ticks);
reader.Read();
if (reader.TokenType != JsonToken.EndConstructor)
throw new Exception("Unexpected token parsing date. Expected EndConstructor, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
#if !PocketPC && !NET20
if (t == typeof(DateTimeOffset))
return new DateTimeOffset(d);
#endif
return d;
}
}
}
考虑使用JSON.NET。它是一个强大的组件,可以将对象序列化为JSON字符串。@Kovu I修复了返回值。我想你也可以省点钱,谢谢。除了日期时间,几乎所有的东西都能工作。我得到了新的日期XXXXXXXXXXXXXXXXXX而不是威士忌xxxxxxxxxxxxxxxxxxx@Kovu我添加了一个自定义转换器,它应该能够做到这一点。@Kovu你成功地让它工作了吗?上次编辑时,我没有收到你的任何反馈。