C#在字符串中查找文本,然后提取变量

时间:2013-04-08 11:57:00

标签: c# json string search

我正在搞乱Steam Web API。我正在尝试创建一个函数,它将找到一段文本,然后提取另一段文本,这将改变,这取决于我用函数查找的用户。

我尝试过使用IndexOf,但由于我想提取的文字长度各不相同,所以很难。

Json响应我想从这样的字符串中提取字符串,但会因我查找的每个用户而异。

{
"response": {
    "game_count": 54,
    "games": [
        {
            "appid": 240,
            "playtime_forever": 51842
        },
        {
            "appid": 260,
            "playtime_forever": 43
        },
        {
            "appid": 300,
            "playtime_forever": 191
        },
        {
            "appid": 320,
            "playtime_forever": 130
        },
        {
            "appid": 340,
            "playtime_forever": 4
        },
        {
            "appid": 520
        },
        {
            "appid": 4000,
            "playtime_2weeks": 798,
            "playtime_forever": 61803
        },
        {
            "appid": 440,
            "playtime_forever": 19466
        },
        {
            "appid": 105600,
            "playtime_forever": 2084
        },
        {
            "appid": 72850,
            "playtime_forever": 2010
        },
        {
            "appid": 380,
            "playtime_forever": 91
        },
        {
            "appid": 400,
            "playtime_forever": 76
        },
        {
            "appid": 420
        },
        {
            "appid": 220,
            "playtime_forever": 827
        },
        {
            "appid": 550,
            "playtime_forever": 906
        },
        {
            "appid": 33910,
            "playtime_forever": 77
        },
        {
            "appid": 33930,
            "playtime_2weeks": 1714,
            "playtime_forever": 31904
        },
        {
            "appid": 219540,
            "playtime_forever": 0
        },
        {
            "appid": 570
        },
        {
            "appid": 205790
        },
        {
            "appid": 22380,
            "playtime_forever": 1119
        },
        {
            "appid": 105400,
            "playtime_forever": 134
        },
        {
            "appid": 204030
        },
        {
            "appid": 12120
        },
        {
            "appid": 12250
        },
        {
            "appid": 24010
        },
        {
            "appid": 8190,
            "playtime_forever": 723
        },
        {
            "appid": 620,
            "playtime_forever": 101
        },
        {
            "appid": 644
        },
        {
            "appid": 730,
            "playtime_forever": 431
        },
        {
            "appid": 10,
            "playtime_forever": 396
        },
        {
            "appid": 80
        },
        {
            "appid": 100
        },
        {
            "appid": 42680,
            "playtime_forever": 65
        },
        {
            "appid": 42690,
            "playtime_forever": 1435
        },
        {
            "appid": 22200
        },
        {
            "appid": 113200,
            "playtime_forever": 270
        },
        {
            "appid": 20540
        },
        {
            "appid": 55110
        },
        {
            "appid": 43110
        },
        {
            "appid": 9340
        },
        {
            "appid": 50620
        },
        {
            "appid": 4560
        },
        {
            "appid": 55230,
            "playtime_forever": 1354
        },
        {
            "appid": 4540
        },
        {
            "appid": 4570
        },
        {
            "appid": 22370,
            "playtime_forever": 305
        },
        {
            "appid": 70,
            "playtime_forever": 479
        },
        {
            "appid": 70300,
            "playtime_forever": 138
        },
        {
            "appid": 220240,
            "playtime_2weeks": 72,
            "playtime_forever": 453
        },
        {
            "appid": 107410,
            "playtime_2weeks": 80,
            "playtime_forever": 403
        },
        {
            "appid": 40800,
            "playtime_2weeks": 124,
            "playtime_forever": 124
        },
        {
            "appid": 12210,
            "playtime_2weeks": 663,
            "playtime_forever": 663
        },
        {
            "appid": 12220,
            "playtime_2weeks": 658,
            "playtime_forever": 658
        }
    ]

}

}

我想要做的是搜索“\”appid \“:440”,然后能够得到之后的playtime_forever int。我无能为力。如果字符串有一个设置的长度,我只能从Split函数中获取帮助,因为那时我可以返回我想要的数组索引。

如果不清楚的话,我非常抱歉,我尽力解释我想要实现的目标。

提前致谢,

伊萨克

2 个答案:

答案 0 :(得分:0)

正如评论所说,你所看到的不是一个简单的字符串,所以不要尝试为它编写自己的解析器。这是一个包含对象集合的JSON响应。这些对象似乎有3个字段:

  • appId
  • playtime_forever
  • playtime_2Weeks

如果您希望在代码中本地使用这些内容,只需创建一个具有三个公共属性(getter&amp; setter)的传输对象,其中每个属性与JSON字段具有相同的名称。然后只需使用System.WEb.Script命名空间的JavaScriptSerializer将集合反序列化为List<TransportObject>

答案 1 :(得分:0)

你可以尝试将Json反序列化为动态对象,看看这里: Deserialize JSON into C# dynamic object?

然后遍历您的应用集合并检查appId = 440

for(int i = 0; i <= deserializedResult.Count; i++)
{
    if(deserializedResult[i] == 440)
        ....
}

似乎playtime_forever并不总是可用,所以我猜你必须使用反射来看看playtime_forever是否存在才能访问它。