C# Json无组件纯代码解析
http://blog.sina.com.cn/s/blog_53c0699b01017cm7.html
JSON用处多多，但C#解析起来却有点麻烦，特别是旧版的C#2.0，网上的大部分JSON解析方法都是基于一些组件，而且有局限性，非得绑定实体。其实JSON解析没有这么复杂， 本文为无组件纯代码方式解析：
1、JSON对象
public class JsonObject
{
public Dictionary KeyValues = new Dictionary();
public Dictionary KeyArrays = new Dictionary();
public Dictionary KeyObject = new Dictionary();
}
2、解析文本
public class JsonParser
{
public List Jsons = new List();
public string ErrorMessage = "";
private enum JsonParseTypes
{
JsonObject,
JsonKey,
JsonValue,
JsonTextValue,
JsonObjectArray,
JsonTextArray
}
private Stack opStack = new Stack();
private Stack keyStack = new Stack();
private int jsonPos = 0;
private string jsonText = "";
public bool Parse(string text)
{
ErrorMessage = "";
Jsons = new List();
jsonText = text.Trim();
if (jsonText.Length < 2)
{
ErrorMessage = "Json text formate error.";
return false;
}
while (jsonPos < jsonText.Length)
{
char c = text[jsonPos];
if (c == '{')
{
// found objects
jsonPos++;
JsonObject jo = this.ParseJsonObject();
Jsons.Add(jo);
}
jsonPos++;
}
return true;
}
private JsonObject ParseJsonObject()
{
JsonObject result = new JsonObject();
string lastKey = "";
string lastValue = "";
bool QuatationClosed = true;
bool startKey = false;
bool startValue = false;
while (jsonPos < jsonText.Length)
{
char c = jsonText[jsonPos];
if (c == '{' && lastKey.Length > 0)
{
// found object
jsonPos++;
JsonObject jo = this.ParseJsonObject();
result.KeyObject.Add(lastKey, jo);
lastKey = "";
}
else if (c == '[' && lastKey.Length > 0)
{
// found arrays
jsonPos++;
List arr = this.ParseJsonArray();
result.KeyArrays.Add(lastKey, arr.ToArray());
lastKey = "";
}
else if (c == '\'' || c == '"')
{
if (lastKey.Length > 0 && startKey)
{
// end of value
startKey = false;
}
else if(!startValue)
{
// start key
startKey = true;
}
else if (startValue)
{
lastValue += c;
QuatationClosed = !QuatationClosed;
}
}
else if (c == ':' && QuatationClosed)
{
// start value
startValue = true;
}
else if (c == ',' && QuatationClosed && lastKey.Length > 0 )
{
// end of value
startValue = false;
result.KeyValues.Add(lastKey, ClearTextValue(lastValue));
lastKey = "";
lastValue = "";
}
else if (c == '}')
{
if (QuatationClosed && lastKey.Length > 0)
{
// end of value
startValue = false;
result.KeyValues.Add(lastKey, ClearTextValue(lastValue));
lastKey = "";
lastValue = "";
}
// end of object
break;
}
else
{
// key
if (startKey)
{
lastKey += c;
}
else if (startValue)
{
lastValue += c;
}
}
jsonPos++;
}
return result;
}
private List ParseJsonArray()
{
List result = new List();
string lastValue = "";
bool QuatationClosed = true;
while (jsonPos < jsonText.Length)
{
char c = jsonText[jsonPos];
if (c == '\'' || c == '"')
{
lastValue += c;
QuatationClosed = !QuatationClosed;
}
else if (c == ',' && QuatationClosed )
{
// end of value
result.Add(ClearTextValue(lastValue));
lastValue = "";
}
else if (c == ']')
{
if (QuatationClosed)
{
// end of value
result.Add(ClearTextValue(lastValue));
lastValue = "";
}
// end of object
break;
}
else
{
lastValue += c;
}
jsonPos++;
}
return result;
}
private string ClearTextValue(string value)
{
string text = "";
if (value.Length > 0)
{
text = value.Replace("\n", "").Trim();
if (text.Length > 0 && text.Substring(0, 1) == "'")
{
text = text.Substring(1);
if (text.Length > 0 && text.Substring(text.Length -1, 1) == "'")
{
text = text.Substring(0, text.Length -1);
}
}
else if (text.Length > 0 && text.Substring(0, 1) == "\"")
{
text = text.Substring(1);
if (text.Length > 0 && text.Substring(text.Length - 1, 1) == "\"")
{
text = text.Substring(0, text.Length - 1);
}
}
}
return text;
}
}