C# 如何反序列化JSON数据?
我不熟悉JSON数据 我正在从web服务读取数据。返回的查询数据如下:C# 如何反序列化JSON数据?,c#,json,windows-phone-8,json.net,json-deserialization,C#,Json,Windows Phone 8,Json.net,Json Deserialization,我不熟悉JSON数据 我正在从web服务读取数据。返回的查询数据如下: [["B02001_001E","NAME","state"], ["4712651","Alabama","01"], ["691189","Alaska","02"], ["6246816","Arizona","04"], ["18511620","Florida","12"], ["9468815","Georgia","13"], ["1333591","Hawaii","15"], ["152679
[["B02001_001E","NAME","state"],
["4712651","Alabama","01"],
["691189","Alaska","02"],
["6246816","Arizona","04"],
["18511620","Florida","12"],
["9468815","Georgia","13"],
["1333591","Hawaii","15"],
["1526797","Idaho","16"],
["3762322","Puerto Rico","72"]]
有没有一种方法可以反序列化这些数据,这样就可以在不首先定义对象的情况下生成基本对象?在上面的示例中,对象由第一行定义:
["B02001_001E","NAME","state"],
一般来说,web服务将返回格式化为二维JSON数组的查询数据,其中第一行提供列名,后续行提供数据值。您可以非常轻松地对其进行反序列化。C#中的数据结构只是
List
,因此您可以这样做
List<string[]> data = JsonConvert.DeserializeObject<List<string[]>>(jsonString);
List data=JsonConvert.DeserializeObject(jsonString);
上面的代码假设您使用的是json.NET
编辑:注意json在技术上是一个字符串数组数组。我更喜欢使用
List
作为我自己的声明,因为它更直观。它不会给json.NET带来任何问题,如果您希望它是一个字符串数组的数组,那么您需要将类型更改为(我认为)string[]
但是在C#中有一些关于锯齿状数组和2D数组的有趣的小把戏,我真的不知道,所以我不想在这里处理它。步骤1:转到json.org,找到json库,无论您使用什么技术来调用这个web服务。下载并链接到该库
步骤2:假设您正在使用Java。您可以像这样使用JSONArray:
JSONArray myArray=new JSONArray(queryResponse);
for (int i=0;i<myArray.length;i++){
JSONArray myInteriorArray=myArray.getJSONArray(i);
if (i==0) {
//this is the first one and is special because it holds the name of the query.
}else{
//do your stuff
String stateCode=myInteriorArray.getString(0);
String stateName=myInteriorArray.getString(1);
}
}
JSONArray myArray=newjsonarray(queryResponse);
对于(int i=0;i如果使用.Net 4.5,还可以使用标准的.Net json序列化程序:
using System.Runtime.Serialization.Json;
...
Stream jsonSource = ...; // serializer will read data stream
var s = new DataContractJsonSerializer(typeof(string[][]));
var j = (string[][])s.ReadObject(jsonSource);
在.Net 4.5及更早版本中,您可以使用JavaScriptSerializer类:
using System.Web.Script.Serialization;
...
JavaScriptSerializer serializer = new JavaScriptSerializer();
string[][] list = serializer.Deserialize<string[][]>(json);
使用System.Web.Script.Serialization;
...
JavaScriptSerializer serializer=新的JavaScriptSerializer();
字符串[][]列表=序列化程序。反序列化(json);
您可以编写自己的JSON解析器,并根据您的需求使其更通用。以下是一个很好地满足了我的目的,希望也能对您有所帮助
class JsonParsor
{
public static DataTable JsonParse(String rawJson)
{
DataTable dataTable = new DataTable();
Dictionary<string, string> outdict = new Dictionary<string, string>();
StringBuilder keybufferbuilder = new StringBuilder();
StringBuilder valuebufferbuilder = new StringBuilder();
StringReader bufferreader = new StringReader(rawJson);
int s = 0;
bool reading = false;
bool inside_string = false;
bool reading_value = false;
bool reading_number = false;
while (s >= 0)
{
s = bufferreader.Read();
//open JSON
if (!reading)
{
if ((char)s == '{' && !inside_string && !reading)
{
reading = true;
continue;
}
if ((char)s == '}' && !inside_string && !reading)
break;
if ((char)s == ']' && !inside_string && !reading)
continue;
if ((char)s == ',')
continue;
}
else
{
if (reading_value)
{
if (!inside_string && (char)s >= '0' && (char)s <= '9')
{
reading_number = true;
valuebufferbuilder.Append((char)s);
continue;
}
}
//if we find a quote and we are not yet inside a string, advance and get inside
if (!inside_string)
{
if ((char)s == '\"' && !inside_string)
inside_string = true;
if ((char)s == '[' && !inside_string)
{
keybufferbuilder.Length = 0;
valuebufferbuilder.Length = 0;
reading = false;
inside_string = false;
reading_value = false;
}
if ((char)s == ',' && !inside_string && reading_number)
{
if (!dataTable.Columns.Contains(keybufferbuilder.ToString()))
dataTable.Columns.Add(keybufferbuilder.ToString(), typeof(string));
if (!outdict.ContainsKey(keybufferbuilder.ToString()))
outdict.Add(keybufferbuilder.ToString(), valuebufferbuilder.ToString());
keybufferbuilder.Length = 0;
valuebufferbuilder.Length = 0;
reading_value = false;
reading_number = false;
}
continue;
}
//if we reach end of the string
if (inside_string)
{
if ((char)s == '\"')
{
inside_string = false;
s = bufferreader.Read();
if ((char)s == ':')
{
reading_value = true;
continue;
}
if (reading_value && (char)s == ',')
{
//put the key-value pair into dictionary
if(!dataTable.Columns.Contains(keybufferbuilder.ToString()))
dataTable.Columns.Add(keybufferbuilder.ToString(),typeof(string));
if (!outdict.ContainsKey(keybufferbuilder.ToString()))
outdict.Add(keybufferbuilder.ToString(), valuebufferbuilder.ToString());
keybufferbuilder.Length = 0;
valuebufferbuilder.Length = 0;
reading_value = false;
}
if (reading_value && (char)s == '}')
{
if (!dataTable.Columns.Contains(keybufferbuilder.ToString()))
dataTable.Columns.Add(keybufferbuilder.ToString(), typeof(string));
if (!outdict.ContainsKey(keybufferbuilder.ToString()))
outdict.Add(keybufferbuilder.ToString(), valuebufferbuilder.ToString());
ICollection key = outdict.Keys;
DataRow newrow = dataTable.NewRow();
foreach (string k_loopVariable in key)
{
CommonModule.LogTheMessage(outdict[k_loopVariable],"","","");
newrow[k_loopVariable] = outdict[k_loopVariable];
}
dataTable.Rows.Add(newrow);
CommonModule.LogTheMessage(dataTable.Rows.Count.ToString(), "", "row_count", "");
outdict.Clear();
keybufferbuilder.Length=0;
valuebufferbuilder.Length=0;
reading_value = false;
reading = false;
continue;
}
}
else
{
if (reading_value)
{
valuebufferbuilder.Append((char)s);
continue;
}
else
{
keybufferbuilder.Append((char)s);
continue;
}
}
}
else
{
switch ((char)s)
{
case ':':
reading_value = true;
break;
default:
if (reading_value)
{
valuebufferbuilder.Append((char)s);
}
else
{
keybufferbuilder.Append((char)s);
}
break;
}
}
}
}
return dataTable;
}
}
JsonParsor类
{
公共静态数据表JsonParse(字符串rawJson)
{
DataTable=新的DataTable();
Dictionary outdict=新字典();
StringBuilder keybufferbuilder=新的StringBuilder();
StringBuilder valuebufferbuilder=新的StringBuilder();
StringReader bufferreader=新的StringReader(rawJson);
int s=0;
布尔读数=假;
bool inside_string=false;
bool reading_value=false;
bool reading_number=false;
而(s>=0)
{
s=bufferreader.Read();
//开放JSON
如果(!读取)
{
如果((char)s=='{'&&&!内部字符串&&&!正在读取)
{
阅读=正确;
继续;
}
如果((char)s=='}'&&!内部字符串&&!正在读取)
打破
如果((char)s==']'&&&!内部字符串&&&!正在读取)
继续;
如果((char)s==',')
继续;
}
其他的
{
if(读取_值)
{
如果(!inside_string&&(char)s>='0'&&(char)s