Newtonsoft.Json解析json字符串和写json字符串

写：

        StringWriter sw = new StringWriter();
        JsonWriter writer = new JsonWriter(sw);
//如果报错则使用JsonWriter writer = new JsonTextWriter(sw);
        writer.WriteStartArray();
        writer.WriteValue("JSON!");
        writer.WriteValue(1);
        writer.WriteValue(true);
        writer.WriteStartObject();
        writer.WritePropertyName("property");
        writer.WriteValue("value");
        writer.WriteEndObject();
        writer.WriteStartObject();
        writer.WritePropertyName("data");
        writer.WriteValue(_str);
        writer.WriteEndObject();
        writer.WriteEndArray();
        writer.Flush();
        string jsonText = sw.GetStringBuilder().ToString();
        Response.Write(jsonText);    

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